Add PolicyManager as plugin

PolicyManager decides next layout by using occured event and current state
based on the policy table.

And PolicyManager is plugin for WindowManager.
Therefore the OEMs can replace it.

This patch provides PolicyManager I/F as reference implementation
and does not have policy table.
Therefore PolicyManager updates each layers
to draw the applications in normal.full area
in accordance with just like activate/deactivate request.

[APIs of PolicyManager class]
  - int initialize(void)
    Initialize PolicyManger.
      input:  none
      output: 0(success), -1(error)

  - void registerCallback(CallbackTable callback_table)
    Register callback functions.
      input:  the pointers of callback handlers
      output: none

    "CallbackTable" type is as follows:
      typedef struct
      {
          Handler onStateTransitioned;
          Handler onError;
      } CallbackTable;

    "Handler" type is as follows:
      using Handler = std::function<void(json_object *)>;

  - int setInputEventData(json_object *json_in)
    Set input event data for the policy table.
      input:  input event data as json_object
      output: 0(success), -1(error)

  - int executeStateTransition(void)
    Execute state transition by using set input event data.
      input:  none
      output: 0(success), -1(error)

  - void undoState(void)
    Undo state only once per once state transition.
      input:  none
      output: none

[Callbacks of PolicyManager class]
 - void onStateTransitioned(json_object *json_out)
   When state transition succeeds, this callback is called.
   The argument json_out has the state after transition.

 - void onError(json_object *json_out)
   When state transition fails, this callback is called.
   The argument json_out has the error information
   like message, inputed event datas and etc..

Bug-AGL: SPEC-1537

Change-Id: I44b771d4145078bf3ea05e26165bb9c1a03b10c3
Signed-off-by: Yuta Doi <yuta-d@witz-inc.co.jp>

9 files changed, 2257 insertions, 0 deletions

diff --git a/src/policy_manager/CMakeLists.txt b/src/policy_manager/CMakeLists.txt
new file mode 100644
index 0000000..62e5ee9
--- /dev/null
+++ b/src/policy_manager/CMakeLists.txt
@@ -0,0 +1,65 @@
+#
+# Copyright (c) 2017 TOYOTA MOTOR CORPORATION
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+include(FindPkgConfig)
+
+# We do not want a prefix for our module
+set(CMAKE_SHARED_MODULE_PREFIX "")
+
+set(TARGETS_PM lib${PLUGIN_PM})
+
+add_library(${TARGETS_PM} MODULE
+   policy_manager.cpp
+)
+
+target_include_directories(${TARGETS_PM}
+    PRIVATE
+        ../../include
+        ../
+        ./
+        ./stm/${USE_STM_NAME}/src/include
+)
+
+target_link_libraries(${TARGETS_PM}
+    PRIVATE
+        ${CMAKE_BINARY_DIR}/src/${PLUGIN_PM}/stm/${USE_STM_NAME}/src/libstm.so
+)
+
+target_compile_definitions(${TARGETS_PM}
+    PRIVATE
+        _GNU_SOURCE
+)
+
+target_compile_options(${TARGETS_PM}
+    PRIVATE
+        -Wall -Wextra -Wno-unused-parameter -Wno-comment)
+
+set_target_properties(${TARGETS_PM}
+    PROPERTIES
+        CXX_EXTENSIONS OFF
+        CXX_STANDARD 14
+        CXX_STANDARD_REQUIRED ON
+
+        C_EXTENSIONS OFF
+        C_STANDARD 99
+        C_STANDARD_REQUIRED ON
+)
+
+install(
+   TARGETS ${TARGET_PM}
+   DESTINATION ${CMAKE_INSTALL_LIBDIR}
+   COMPONENT "runtime"
+)
diff --git a/src/policy_manager/db/layouts.db b/src/policy_manager/db/layouts.db
new file mode 100644
index 0000000..da78b31
--- /dev/null
+++ b/src/policy_manager/db/layouts.db
@@ -0,0 +1,152 @@
+{
+    "layouts": [
+        {
+            "name": "homescreen",
+            "layer": "far_homescreen",
+            "areas": [
+                {
+                    "name": "fullscreen",
+                    "category": "homescreen"
+                }
+            ]
+        },
+        {
+            "name": "map.normal",
+            "layer": "apps",
+            "areas": [
+                {
+                    "name": "normal.full",
+                    "category": "map"
+                }
+            ]
+        },
+        {
+            "name": "map.split",
+            "layer": "apps",
+            "areas": [
+                {
+                    "name": "split.main",
+                    "category": "map"
+                },
+                {
+                    "name": "split.sub",
+                    "category": "splitable"
+                }
+            ]
+        },
+        {
+            "name": "map.fullscreen",
+            "layer": "apps",
+            "areas": [
+                {
+                    "name": "fullscreen",
+                    "category": "map"
+                }
+            ]
+        },
+        {
+            "name": "splitable.normal",
+            "layer": "apps",
+            "areas": [
+                {
+                    "name": "normal.full",
+                    "category": "splitable"
+                }
+            ]
+        },
+        {
+            "name": "splitable.split",
+            "layer": "apps",
+            "areas": [
+                {
+                    "name": "split.main",
+                    "category": "splitable"
+                },
+                {
+                    "name": "split.sub",
+                    "category": "splitable"
+                }
+            ]
+        },
+        {
+            "name": "general.normal",
+            "layer": "apps",
+            "areas": [
+                {
+                    "name": "normal.full",
+                    "category": "general"
+                }
+            ]
+        },
+        {
+            "name": "system.normal",
+            "layer": "apps",
+            "areas": [
+                {
+                    "name": "normal.full",
+                    "category": "system"
+                }
+            ]
+        },
+        {
+            "name": "software_keyboard",
+            "layer": "near_homescreen",
+            "areas": [
+                {
+                    "name": "software_keyboard",
+                    "category": "software_keyboard"
+                }
+            ]
+        },
+        {
+            "name": "restriction.normal",
+            "layer": "restriction",
+            "areas": [
+                {
+                    "name": "restriction.normal",
+                    "category": "restriction"
+                }
+            ]
+        },
+        {
+            "name": "restriction.split.main",
+            "layer": "restriction",
+            "areas": [
+                {
+                    "name": "restriction.split.main",
+                    "category": "restriction"
+                }
+            ]
+        },
+        {
+            "name": "restriction.split.sub",
+            "layer": "restriction",
+            "areas": [
+                {
+                    "name": "restriction.split.sub",
+                    "category": "restriction"
+                }
+            ]
+        },
+        {
+            "name": "pop_up",
+            "layer": "on_screen",
+            "areas": [
+                {
+                    "name": "on_screen",
+                    "category": "pop_up"
+                }
+            ]
+        },
+        {
+            "name": "system_alert",
+            "layer": "on_screen",
+            "areas": [
+                {
+                    "name": "on_screen",
+                    "category": "system_alert"
+                }
+            ]
+        }
+    ]
+}
diff --git a/src/policy_manager/db/roles.db b/src/policy_manager/db/roles.db
new file mode 100644
index 0000000..d0d911a
--- /dev/null
+++ b/src/policy_manager/db/roles.db
@@ -0,0 +1,44 @@
+{
+    "roles":[
+    {
+        "category": "homescreen",
+        "role": "homescreen",
+        "area": "fullscreen",
+    },
+    {
+        "category": "map",
+        "role": "map",
+        "area": "normal.full | split.main",
+    },
+    {
+        "category": "general",
+        "role": "launcher | poi | browser | sdl | mixer | radio | hvac | debug | phone | video | music | fallback",
+        "area": "normal.full",
+    },
+    {
+        "category": "system",
+        "role": "settings | dashboard",
+        "area": "normal.full",
+    },
+    {
+        "category": "software_keyboard",
+        "role": "software_keyboard",
+        "area": "software_keyboard",
+    },
+    {
+        "category": "restriction",
+        "role": "restriction",
+        "area": "restriction.normal | restriction.split.main | restriction.split.sub",
+    },
+    {
+        "category": "pop_up",
+        "role": "on_screen | on_screen_phone",
+        "area": "on_screen",
+    },
+    {
+        "category": "system_alert",
+        "role": "system_alert",
+        "area": "on_screen",
+    }
+    ]
+}
diff --git a/src/policy_manager/db/roles.db.split b/src/policy_manager/db/roles.db.split
new file mode 100644
index 0000000..2776ce5
--- /dev/null
+++ b/src/policy_manager/db/roles.db.split
@@ -0,0 +1,51 @@
+{
+    "roles":[
+    {
+        "category": "homescreen",
+        "role": "homescreen",
+        "area": "fullscreen",
+    },
+    {
+        "category": "map",
+        "role": "map",
+        "area": "normal.full | split.main",
+    },
+    {
+        "category": "general",
+        "role": "launcher | poi | browser | sdl | mixer | radio | hvac | debug | phone | fallback",
+        "area": "normal.full",
+        "description": "For split test, video and music are moved to category:splitable",
+    },
+    {
+        "category": "system",
+        "role": "settings | dashboard",
+        "area": "normal.full",
+    },
+    {
+        "category": "splitable",
+        "role": "video | music",
+        "area": "normal.full | split.main | split.sub",
+        "description": "For split test, video and music are included here",
+    },
+    {
+        "category": "software_keyboard",
+        "role": "software_keyboard",
+        "area": "software_keyboard",
+    },
+    {
+        "category": "restriction",
+        "role": "restriction",
+        "area": "restriction.normal | restriction.split.main | restriction.split.sub",
+    },
+    {
+        "category": "pop_up",
+        "role": "on_screen | on_screen_phone",
+        "area": "on_screen",
+    },
+    {
+        "category": "system_alert",
+        "role": "system_alert",
+        "area": "on_screen",
+    }
+    ]
+}
diff --git a/src/policy_manager/policy_manager.cpp b/src/policy_manager/policy_manager.cpp
new file mode 100644
index 0000000..f994281
--- /dev/null
+++ b/src/policy_manager/policy_manager.cpp
@@ -0,0 +1,1341 @@
+/*
+ * Copyright (c) 2018 TOYOTA MOTOR CORPORATION
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <fstream>
+#include <sstream>
+#include <istream>
+#include <thread>
+#include <map>
+#include <algorithm>
+#include <systemd/sd-event.h>
+#include <json-c/json.h>
+#include "policy_manager.hpp"
+#include "hmi-debug.h"
+
+extern "C"
+{
+#define AFB_BINDING_VERSION 2
+#include <afb/afb-binding.h>
+#include "stm.h"
+}
+
+namespace pm
+{
+static PolicyManager *g_context;
+
+static int transitionStateWrapper(sd_event_source *source, void *data)
+{
+    int ret = g_context->transitionState(source, data);
+    return ret;
+}
+
+static int timerEventWrapper(sd_event_source *source, uint64_t usec, void *data)
+{
+    int ret = g_context->timerEvent(source, usec, data);
+    return ret;
+}
+
+} // namespace pm
+
+PolicyManager::PolicyManager()
+    : eventname2no(),
+      categoryname2no(),
+      areaname2no(),
+      role2category(),
+      category2role(),
+      role2defaultarea()
+{}
+
+int PolicyManager::initialize()
+{
+    int ret = 0;
+
+    // Create convert map
+    for (int i = StmEvtNoMin; i <= StmEvtNoMax; i++)
+    {
+        HMI_DEBUG("wm:pm", "event name:%s no:%d", kStmEventName[i], i);
+        this->eventname2no[kStmEventName[i]] = i;
+    }
+
+    for (int i = StmCtgNoMin; i <= StmCtgNoMax; i++)
+    {
+        HMI_DEBUG("wm:pm", "category name:%s no:%d", kStmCategoryName[i], i);
+        this->categoryname2no[kStmCategoryName[i]] = i;
+    }
+
+    for (int i = StmAreaNoMin; i <= StmAreaNoMax; i++)
+    {
+        HMI_DEBUG("wm:pm", "area name:%s no:%d", kStmAreaName[i], i);
+        this->areaname2no[kStmAreaName[i]] = i;
+    }
+
+    // Load roles.db
+    ret = this->loadRoleDb();
+    if (0 > ret)
+    {
+        HMI_ERROR("wm:pm", "Load roles.db Error!!");
+        return ret;
+    }
+
+    // Load layouts.db
+    ret = this->loadLayoutDb();
+    if (0 > ret)
+    {
+        HMI_ERROR("wm:pm", "Load layouts.db Error!!");
+        return ret;
+    }
+
+    // Initialize state which is managed by PolicyManager
+    this->initializeState();
+
+    // Initialize StateTransitioner
+    stmInitialize();
+
+    // Store instance
+    pm::g_context = this;
+
+    return ret;
+}
+
+void PolicyManager::registerCallback(CallbackTable callback)
+{
+    this->callback.onStateTransitioned = callback.onStateTransitioned;
+    this->callback.onError = callback.onError;
+}
+
+int PolicyManager::setInputEventData(json_object *json_in)
+{
+    // Check arguments
+    if (nullptr == json_in)
+    {
+        HMI_ERROR("wm:pm", "Argument is NULL!!");
+        return -1;
+    }
+
+    // Get event from json_object
+    const char *event = this->getStringFromJson(json_in, "event");
+    int event_no = StmEvtNoNone;
+    if (nullptr != event)
+    {
+        // Convert name to number
+        auto itr = this->eventname2no.find(event);
+        if (this->eventname2no.end() != itr)
+        {
+            event_no = this->eventname2no[event];
+            HMI_DEBUG("wm:pm", "event(%s:%d)", event, event_no);
+        }
+        else
+        {
+            HMI_ERROR("wm:pm", "Invalid event name!!");
+            return -1;
+        }
+    }
+    else
+    {
+        HMI_ERROR("wm:pm", "Event is not set!!");
+        return -1;
+    }
+
+    // Get role from json_object
+    const char *role = this->getStringFromJson(json_in, "role");
+    int category_no = StmCtgNoNone;
+    if (nullptr != role)
+    {
+        HMI_DEBUG("wm:pm", "role(%s)", role);
+
+        // Convert role to category
+        std::string category = "";
+        auto itr = this->role2category.find(role);
+        if (this->role2category.end() != itr)
+        {
+            category = this->role2category[role];
+        }
+        else
+        {
+            itr = this->role2category.find("fallback");
+            if (this->role2category.end() != itr)
+            {
+                HMI_DEBUG("wm:pm", "Role:%s is not registered in roles.db, fallback as normal app", role);
+                category = this->role2category["fallback"];
+            }
+        }
+
+        if ("" != category)
+        {
+            // Convert name to number
+            category_no = categoryname2no[category];
+            HMI_DEBUG("wm:pm", "category(%s:%d)", category.c_str(), category_no);
+        }
+    }
+
+    if (StmCtgNoNone == category_no)
+    {
+        role = "";
+    }
+
+    // Get areat from json_object
+    const char *area = this->getStringFromJson(json_in, "area");
+    int area_no = StmAreaNoNone;
+    if (nullptr != area)
+    {
+        auto itr = this->areaname2no.find(area);
+        if (this->areaname2no.end() != itr)
+        {
+            area_no = this->areaname2no[area];
+            HMI_DEBUG("wm:pm", "area(%s:%d)", area, area_no);
+        }
+    }
+
+    // If role is set and area is not set, use default area
+    if ((StmAreaNoNone == area_no) && (StmCtgNoNone != category_no))
+    {
+        std::string def_area = this->role2defaultarea[role];
+        area_no = this->areaname2no[def_area];
+        HMI_DEBUG("wm:pm", "area(%s:%d)", def_area.c_str(), area_no);
+    }
+
+    // Set event info to the queue
+    EventInfo event_info;
+    int event_id = STM_CREATE_EVENT_ID(event_no, category_no, area_no);
+    event_info.event = event_id;
+    event_info.role = std::string(role);
+    event_info.delay = 0;
+    this->event_info_queue.push(event_info);
+
+    return 0;
+}
+
+int PolicyManager::executeStateTransition()
+{
+    int ret;
+    EventInfo event_info;
+
+    while (!this->event_info_queue.empty())
+    {
+        // Get event info from queue and delete
+        event_info = this->event_info_queue.front();
+        this->event_info_queue.pop();
+
+        // Set event info for checking policy
+        ret = this->setStateTransitionProcessToSystemd(event_info.event, event_info.delay, event_info.role);
+    }
+    return ret;
+}
+
+void PolicyManager::undoState()
+{
+    HMI_DEBUG("wm:pm", "Undo State !!!");
+
+    // Undo state of STM
+    stmUndoState();
+
+    HMI_DEBUG("wm:pm", ">>>>>>>>>> BEFORE UNDO");
+    this->dumpLayerState(this->crr_layers);
+
+    this->crr_layers = this->prv_layers;
+
+    HMI_DEBUG("wm:pm", ">>>>>>>>>> AFTER UNDO");
+    this->dumpLayerState(this->crr_layers);
+}
+
+void PolicyManager::initializeState()
+{
+    this->initializeLayerState();
+}
+
+void PolicyManager::initializeLayerState()
+{
+    AreaState init_area;
+    LayoutState init_layout;
+    init_area.name = kStmAreaName[StmAreaNoNone];
+    init_area.category = kStmCategoryName[StmCtgNoNone];
+    init_area.role = "";
+    init_layout.name = kStmLayoutName[StmLayoutNoNone];
+    init_layout.area_list.push_back(init_area);
+
+    for (int i = StmLayerNoMin; i <= StmLayerNoMax; i++)
+    {
+        const char *layer_name = kStmLayerName[i];
+        this->crr_layers[layer_name].name = layer_name;
+        this->crr_layers[layer_name].layout_state = init_layout;
+        this->crr_layers[layer_name].changed = false;
+    }
+
+    this->prv_layers = this->crr_layers;
+}
+
+void PolicyManager::addStateToJson(const char *name, bool changed,
+                                   std::string state, json_object **json_out)
+{
+    if ((nullptr == name) || (nullptr == json_out))
+    {
+        HMI_ERROR("wm:pm", "Invalid argument!!!");
+        return;
+    }
+
+    json_object_object_add(*json_out, "name", json_object_new_string(name));
+    json_object_object_add(*json_out, "state", json_object_new_string(state.c_str()));
+    json_object_object_add(*json_out, "changed", json_object_new_boolean(changed));
+}
+
+void PolicyManager::addStateToJson(const char *layer_name, bool changed,
+                                   AreaList area_list, json_object **json_out)
+{
+    if ((nullptr == layer_name) || (nullptr == json_out))
+    {
+        HMI_ERROR("wm:pm", "Invalid argument!!!");
+        return;
+    }
+
+    json_object *json_areas = json_object_new_array();
+    json_object *json_tmp;
+    for (const auto &as : area_list)
+    {
+        json_tmp = json_object_new_object();
+        json_object_object_add(json_tmp, "name", json_object_new_string(as.name.c_str()));
+        json_object_object_add(json_tmp, "role", json_object_new_string(as.role.c_str()));
+        json_object_array_add(json_areas, json_tmp);
+    }
+
+    json_object_object_add(*json_out, "name", json_object_new_string(layer_name));
+    json_object_object_add(*json_out, "changed", json_object_new_boolean(changed));
+    json_object_object_add(*json_out, "areas", json_areas);
+}
+
+void PolicyManager::updateState(int event_id, StmState crr_state)
+{
+    this->updateLayerState(event_id, crr_state);
+}
+
+void PolicyManager::updateLayerState(int event_id, StmState crr_state)
+{
+    int event_no, category_no, area_no;
+
+    for (int layer_no = StmLayerNoMin;
+         layer_no <= StmLayerNoMax; layer_no++)
+    {
+        HMI_DEBUG("wm:pm", ">>> LAYER:%s CHANGED:%d LAYOUT:%s",
+                  kStmLayerName[layer_no], crr_state.layer[layer_no].changed,
+                  kStmLayoutName[crr_state.layer[layer_no].state]);
+    }
+
+    event_no = STM_GET_EVENT_FROM_ID(event_id);
+    category_no = STM_GET_CATEGORY_FROM_ID(event_id);
+    area_no = STM_GET_AREA_FROM_ID(event_id);
+
+    std::string req_evt = kStmEventName[event_no];
+    std::string req_ctg = kStmCategoryName[category_no];
+    std::string req_area = kStmAreaName[area_no];
+    std::string req_role = this->req_role_list[event_id];
+
+    // Store previous layers
+    this->prv_layers = this->crr_layers;
+
+    // Update layers
+    for (int layer_no = StmLayerNoMin;
+         layer_no <= StmLayerNoMax; layer_no++)
+    {
+        const char *layer_name = kStmLayerName[layer_no];
+
+        // This layer is changed?
+        int changed = crr_state.layer[layer_no].changed;
+        if (changed)
+        {
+            HMI_DEBUG("wm:pm", ">>>>>>>>>> Update layer:%s", layer_name);
+
+           // Get previous layout name of this layer
+            LayoutState prv_layout_state = this->prv_layers[layer_name].layout_state;
+            std::string prv_layout_name = prv_layout_state.name;
+
+            // Get current layout name of this layer
+            int crr_layout_state_no = crr_state.layer[layer_no].state;
+            std::string crr_layout_name = std::string(kStmLayoutName[crr_layout_state_no]);
+
+            LayoutState crr_layout_state;
+            if ((prv_layout_name == crr_layout_name) &&
+                (kStmAreaName[StmAreaNoNone] == crr_layout_name))
+            {
+                // Copy previous layout state for current
+                crr_layout_state = prv_layout_state;
+                changed = 0;
+            }
+            else
+            {
+                // Copy previous layout state for current
+                crr_layout_state = prv_layout_state;
+
+                HMI_DEBUG("wm:pm", "-- layout name previous:%s current:%s",
+                          prv_layout_name.c_str(), crr_layout_name.c_str());
+                if (prv_layout_name == crr_layout_name)
+                {
+                    HMI_DEBUG("wm:pm", "---- Previous layout is same with current");
+                }
+                else
+                {
+                    // If previous layout is NOT same with current,
+                    // current areas is set with default value
+                    HMI_DEBUG("wm:pm", "---- Previous layout is NOT same with current");
+                    crr_layout_state.name = this->default_layouts[crr_layout_name].name;
+                    crr_layout_state.category_num = this->default_layouts[crr_layout_name].category_num;
+                    crr_layout_state.area_list = this->default_layouts[crr_layout_name].area_list;
+                }
+
+                // Create candidate list
+                std::map<std::string, AreaList> cand_list;
+                for (int ctg_no = StmCtgNoMin;
+                     ctg_no <= StmCtgNoMax; ctg_no++)
+                {
+                    if (ctg_no == StmCtgNoNone)
+                    {
+                        continue;
+                    }
+
+                    const char *ctg = kStmCategoryName[ctg_no];
+                    HMI_DEBUG("wm:pm", "-- Create candidate list for ctg:%s", ctg);
+
+                    AreaList tmp_cand_list;
+                    int candidate_num = 0;
+                    int blank_num = crr_layout_state.category_num[ctg];
+
+                    // If requested event is "activate"
+                    // and there are requested category and area,
+                    // update area with requested role in current layout.
+                    bool request_for_this_layer = false;
+                    std::string used_role = "";
+                    if ((ctg == req_ctg) && ("activate" == req_evt))
+                    {
+                        HMI_DEBUG("wm:pm", "---- Requested event is activate");
+                        for (AreaState &as : crr_layout_state.area_list)
+                        {
+                            if (as.category == req_ctg)
+                            {
+                                request_for_this_layer = true;
+
+                                if (as.name == req_area)
+                                {
+                                    as.role = req_role;
+                                    used_role = req_role;
+                                    blank_num--;
+                                    HMI_DEBUG("wm:pm", "------ Update current layout: area:%s category:%s role:%s",
+                                              as.name.c_str(), as.category.c_str(), as.role.c_str());
+                                    break;
+                                }
+                            }
+                        }
+                    }
+
+                    // Create candidate list for category from the previous displayed categories
+                    for (AreaState area_state : prv_layout_state.area_list)
+                    {
+                        if ((std::string(ctg) == area_state.category) &&
+                            (used_role != area_state.role))
+                        {
+                            // If there is the category
+                            // which is same with new category and not used for updating yet,
+                            // push it to list
+                            HMI_DEBUG("wm:pm", "---- Push previous(category:%s role:%s) to candidate list",
+                                      area_state.category.c_str(), area_state.role.c_str());
+                            tmp_cand_list.push_back(area_state);
+                            candidate_num++;
+                        }
+                    }
+
+                    // If NOT updated by requested area:
+                    // there is not requested area in new layout,
+                    // so push requested role to candidate list
+                    if (request_for_this_layer && ("" == used_role))
+                    {
+                        HMI_DEBUG("wm:pm", "---- Push request(area:%s category:%s role:%s) to candidate list",
+                                  req_area.c_str(), req_ctg.c_str(), req_role.c_str());
+                        AreaState area_state;
+                        area_state.name = req_area;
+                        area_state.category = req_ctg;
+                        area_state.role = req_role;
+                        tmp_cand_list.push_back(area_state);
+                        candidate_num++;
+                    }
+
+                    HMI_DEBUG("wm:pm", "---- blank_num:%d candidate_num:%d", blank_num, candidate_num);
+
+                    // Compare number of candidate/blank,
+                    // And remove role in order of the oldest as necessary
+                    if (candidate_num < blank_num)
+                    {
+                        // Refer history stack
+                        // and add to the top of tmp_cand_list in order to the newest
+                        while (candidate_num != blank_num)
+                        {
+                            AreaState area_state;
+                            area_state.name = kStmAreaName[StmAreaNoNone];
+                            area_state.category = ctg;
+                            area_state.role = this->popRoleHistory(ctg);
+                            if ("" == area_state.role)
+                            {
+                                HMI_ERROR("wm:pm", "There is no role in history stack!!");
+                            }
+                            tmp_cand_list.push_back(area_state);
+                            HMI_DEBUG("wm:pm", "------ Add role:%s to candidate list",
+                                      area_state.role.c_str());
+                            candidate_num++;
+                        }
+                    }
+                    else if (candidate_num > blank_num)
+                    {
+                        // Remove the oldest role from candidate list
+                        while (candidate_num != blank_num)
+                        {
+                            std::string removed_role = tmp_cand_list.begin()->role;
+                            HMI_DEBUG("wm:pm", "------ Remove the oldest role:%s from candidate list",
+                                      removed_role.c_str());
+                            tmp_cand_list.erase(tmp_cand_list.begin());
+                            candidate_num--;
+
+                            // Push removed data to history stack
+                            this->pushRoleHistory(ctg, removed_role);
+
+                            // Remove from current layout
+                            for (AreaState &as : crr_layout_state.area_list)
+                            {
+                                if (as.role == removed_role)
+                                {
+                                    as.role = "";
+                                }
+                            }
+                        }
+                    }
+                    else
+                    { // (candidate_num == blank_num)
+                        // nop
+                    }
+
+                    cand_list[ctg] = tmp_cand_list;
+                }
+
+                // Update areas
+                HMI_DEBUG("wm:pm", "-- Update areas by using candidate list");
+                for (AreaState &as : crr_layout_state.area_list)
+                {
+                    HMI_DEBUG("wm:pm", "---- Check area:%s category:%s role:%s",
+                              as.name.c_str(), as.category.c_str(), as.role.c_str());
+                    if ("" == as.role)
+                    {
+                        HMI_DEBUG("wm:pm", "------ Update this area with role:%s",
+                                  cand_list[as.category].begin()->role.c_str());
+                        as.role = cand_list[as.category].begin()->role;
+                        cand_list[as.category].erase(cand_list[as.category].begin());
+                    }
+                }
+            }
+            // Update current layout of this layer
+            this->crr_layers[layer_name].layout_state = crr_layout_state;
+        }
+        // Update changed flag
+        this->crr_layers[layer_name].changed = (changed) ? true : false;
+    }
+
+    // Erase role for the event_id from list
+    this->req_role_list.erase(event_id);
+
+    HMI_DEBUG("wm:pm", ">>>>>>>>>> DUMP LAYERS (BEFORE)");
+    this->dumpLayerState(this->prv_layers);
+
+    HMI_DEBUG("wm:pm", ">>>>>>>>>> DUMP LAYERS (AFTER)");
+    this->dumpLayerState(this->crr_layers);
+
+    this->dumpRoleHistory();
+}
+
+void PolicyManager::createOutputInformation(StmState crr_state, json_object **json_out)
+{
+    json_object *json_tmp;
+
+    // Create layout information
+    //
+    //     "layers": [
+    //     {
+    //         "homescreen": {
+    //             "changed": <bool>,
+    //             "areas": [
+    //             {
+    //                 "name":<const char*>,
+    //                 "role":<const char*>
+    //             }.
+    //             ...
+    //             ]
+    //         }
+    //     },
+    //     ...
+    json_object *json_layer = json_object_new_array();
+    const char *layer_name;
+    for (int layer_no = StmLayerNoMin;
+         layer_no <= StmLayerNoMax; layer_no++)
+    {
+        layer_name = kStmLayerName[layer_no];
+        json_tmp = json_object_new_object();
+        this->addStateToJson(layer_name,
+                             this->crr_layers[layer_name].changed,
+                             this->crr_layers[layer_name].layout_state.area_list,
+                             &json_tmp);
+        json_object_array_add(json_layer, json_tmp);
+    }
+    json_object_object_add(*json_out, "layers", json_layer);
+}
+
+int PolicyManager::transitionState(sd_event_source *source, void *data)
+{
+    HMI_DEBUG("wm:pm", ">>>>>>>>>> START STATE TRANSITION");
+
+    int event_id = *((int *)data);
+
+    int event_no, category_no, area_no;
+    event_no = STM_GET_EVENT_FROM_ID(event_id);
+    category_no = STM_GET_CATEGORY_FROM_ID(event_id);
+    area_no = STM_GET_AREA_FROM_ID(event_id);
+    HMI_DEBUG("wm:pm", ">>>>>>>>>> EVENT:%s CATEGORY:%s AREA:%s",
+              kStmEventName[event_no],
+              kStmCategoryName[category_no],
+              kStmAreaName[area_no]);
+
+    // Transition state
+    StmState crr_state;
+    int ret = stmTransitionState(event_id, &crr_state);
+    if (0 > ret)
+    {
+        HMI_ERROR("wm:pm", "Failed transition state");
+        if (nullptr != this->callback.onError)
+        {
+            json_object *json_out = json_object_new_object();
+            json_object_object_add(json_out, "message",
+                                   json_object_new_string("Failed to transition state"));
+            json_object_object_add(json_out, "event",
+                                   json_object_new_string(kStmEventName[event_no]));
+            json_object_object_add(json_out, "role",
+                                   json_object_new_string(this->req_role_list[event_id].c_str()));
+            json_object_object_add(json_out, "area",
+                                   json_object_new_string(kStmAreaName[area_no]));
+            this->callback.onError(json_out);
+            json_object_put(json_out);
+        }
+        return -1;
+    }
+
+    // Update state which is managed by PolicyManager
+    this->updateState(event_id, crr_state);
+
+    // Create output information for ResourceManager
+    json_object *json_out = json_object_new_object();
+    this->createOutputInformation(crr_state, &json_out);
+
+    // Notify changed state
+    if (nullptr != this->callback.onStateTransitioned)
+    {
+        this->callback.onStateTransitioned(json_out);
+    }
+
+    // Release json_object
+    json_object_put(json_out);
+
+    // Release data
+    delete (int *)data;
+
+    // Destroy sd_event_source object
+    sd_event_source_unref(source);
+
+    // Remove event source from list
+    if (this->event_source_list.find(event_id) != this->event_source_list.end())
+    {
+        this->event_source_list.erase(event_id);
+    }
+
+    HMI_DEBUG("wm:pm", ">>>>>>>>>> FINISH STATE TRANSITION");
+    return 0;
+}
+
+int PolicyManager::timerEvent(sd_event_source *source, uint64_t usec, void *data)
+{
+    HMI_DEBUG("wm:pm", "Call");
+
+    int ret = this->transitionState(source, data);
+    return ret;
+}
+
+int PolicyManager::setStateTransitionProcessToSystemd(int event_id, uint64_t delay_ms, std::string role)
+{
+    HMI_DEBUG("wm:pm", "event_id:0x%x delay:%d role:%s", event_id, delay_ms, role.c_str());
+
+    // Store requested role
+    this->req_role_list[event_id] = role;
+
+    if (0 == delay_ms)
+    {
+        int ret = sd_event_add_defer(afb_daemon_get_event_loop(), NULL,
+                                     &pm::transitionStateWrapper, new int(event_id));
+        if (0 > ret)
+        {
+            HMI_ERROR("wm:pm", "Faild to sd_event_add_defer: errno:%d", ret);
+            this->req_role_list.erase(event_id);
+            return -1;
+        }
+    }
+    else
+    {
+        // Get current time
+        struct timespec time_spec;
+        clock_gettime(CLOCK_MONOTONIC, &time_spec);
+
+        // Calculate timer fired time
+        uint64_t usec = (time_spec.tv_sec * 1000000) + (time_spec.tv_nsec / 1000) + (delay_ms * 1000);
+
+        // Set timer
+        struct sd_event_source *event_source;
+        int ret = sd_event_add_time(afb_daemon_get_event_loop(), &event_source,
+                                    CLOCK_MONOTONIC, usec, 1,
+                                    &pm::timerEventWrapper, new int(event_id));
+        if (0 > ret)
+        {
+            HMI_ERROR("wm:pm", "Faild to sd_event_add_time: errno:%d", ret);
+            this->req_role_list.erase(event_id);
+            return -1;
+        }
+
+        // Store event source
+        this->event_source_list[event_id] = event_source;
+    }
+
+    return 0;
+}
+
+int PolicyManager::loadRoleDb()
+{
+    std::string file_name;
+
+    // Get afm application installed dir
+    char const *afm_app_install_dir = getenv("AFM_APP_INSTALL_DIR");
+    HMI_DEBUG("wm:pm", "afm_app_install_dir:%s", afm_app_install_dir);
+
+    if (!afm_app_install_dir)
+    {
+        HMI_ERROR("wm:pm", "AFM_APP_INSTALL_DIR is not defined");
+    }
+    else
+    {
+        file_name = std::string(afm_app_install_dir) + std::string("/etc/roles.db");
+    }
+
+    // Load roles.db
+    json_object *json_obj;
+    int ret = this->inputJsonFilie(file_name.c_str(), &json_obj);
+    if (0 > ret)
+    {
+        HMI_ERROR("wm:pm", "Could not open roles.db, so use default role information");
+        json_obj = json_tokener_parse(kDefaultRoleDb);
+    }
+    HMI_DEBUG("wm:pm", "json_obj dump:%s", json_object_get_string(json_obj));
+
+    json_object *json_roles;
+    if (!json_object_object_get_ex(json_obj, "roles", &json_roles))
+    {
+        HMI_ERROR("wm:pm", "Parse Error!!");
+        return -1;
+    }
+
+    int len = json_object_array_length(json_roles);
+    HMI_DEBUG("wm:pm", "json_cfg len:%d", len);
+    HMI_DEBUG("wm:pm", "json_cfg dump:%s", json_object_get_string(json_roles));
+
+    json_object *json_tmp;
+    const char *category;
+    const char *roles;
+    const char *areas;
+    for (int i = 0; i < len; i++)
+    {
+        json_tmp = json_object_array_get_idx(json_roles, i);
+
+        category = this->getStringFromJson(json_tmp, "category");
+        roles = this->getStringFromJson(json_tmp, "role");
+        areas = this->getStringFromJson(json_tmp, "area");
+
+        if ((nullptr == category) || (nullptr == roles) || (nullptr == areas))
+        {
+            HMI_ERROR("wm:pm", "Parse Error!!");
+            return -1;
+        }
+
+        // Parse roles by '|'
+        std::vector<std::string> vct_roles;
+        vct_roles = this->parseString(std::string(roles), '|');
+
+        // Parse areas by '|'
+        std::vector<std::string> vct_areas;
+        vct_areas = this->parseString(std::string(areas), '|');
+
+        // Set role, category, default area
+        for (auto itr = vct_roles.begin(); itr != vct_roles.end(); ++itr)
+        {
+            // Delete space from role and area name
+            std::string role = this->deleteSpace(*itr);
+            std::string area = this->deleteSpace(vct_areas[0]);
+
+            this->role2category[role] = std::string(category);
+            this->role2defaultarea[role] = area;
+        }
+
+        this->category2role[std::string(category)] = std::string(roles);
+    }
+
+    // Check
+    HMI_DEBUG("wm:pm", "Check role2category");
+    for (const auto &x : this->role2category)
+    {
+        HMI_DEBUG("wm:pm", "key:%s, val:%s", x.first.c_str(), x.second.c_str());
+    }
+
+    HMI_DEBUG("wm:pm", "Check role2defaultarea");
+    for (const auto &x : this->role2defaultarea)
+    {
+        HMI_DEBUG("wm:pm", "key:%s, val:%s", x.first.c_str(), x.second.c_str());
+    }
+
+    HMI_DEBUG("wm:pm", "Check category2role");
+    for (const auto &x : this->category2role)
+    {
+        HMI_DEBUG("wm:pm", "key:%s, val:%s", x.first.c_str(), x.second.c_str());
+    }
+
+    return 0;
+}
+
+int PolicyManager::loadLayoutDb()
+{
+    HMI_DEBUG("wm:pm", "Call");
+
+    // Get afm application installed dir
+    char const *afm_app_install_dir = getenv("AFM_APP_INSTALL_DIR");
+    HMI_DEBUG("wm:pm", "afm_app_install_dir:%s", afm_app_install_dir);
+
+    std::string file_name;
+    if (!afm_app_install_dir)
+    {
+        HMI_ERROR("wm:pm", "AFM_APP_INSTALL_DIR is not defined");
+    }
+    else
+    {
+        file_name = std::string(afm_app_install_dir) + std::string("/etc/layouts.db");
+    }
+
+    // Load layouts.db
+    json_object *json_obj;
+    int ret = this->inputJsonFilie(file_name.c_str(), &json_obj);
+    if (0 > ret)
+    {
+        HMI_DEBUG("wm:pm", "Could not open layouts.db, so use default layout information");
+        json_obj = json_tokener_parse(kDefaultLayoutDb);
+    }
+    HMI_DEBUG("wm:pm", "json_obj dump:%s", json_object_get_string(json_obj));
+
+    // Perse layouts
+    HMI_DEBUG("wm:pm", "Perse layouts");
+    json_object *json_cfg;
+    if (!json_object_object_get_ex(json_obj, "layouts", &json_cfg))
+    {
+        HMI_ERROR("wm:pm", "Parse Error!!");
+        return -1;
+    }
+
+    int len = json_object_array_length(json_cfg);
+    HMI_DEBUG("wm:pm", "json_cfg len:%d", len);
+    HMI_DEBUG("wm:pm", "json_cfg dump:%s", json_object_get_string(json_cfg));
+
+    const char *layout;
+    const char *role;
+    const char *category;
+    for (int i = 0; i < len; i++)
+    {
+        json_object *json_tmp = json_object_array_get_idx(json_cfg, i);
+
+        layout = this->getStringFromJson(json_tmp, "name");
+        if (nullptr == layout)
+        {
+            HMI_ERROR("wm:pm", "Parse Error!!");
+            return -1;
+        }
+        HMI_DEBUG("wm:pm", "> layout:%s", layout);
+
+        json_object *json_area_array;
+        if (!json_object_object_get_ex(json_tmp, "areas", &json_area_array))
+        {
+            HMI_ERROR("wm:pm", "Parse Error!!");
+            return -1;
+        }
+
+        int len_area = json_object_array_length(json_area_array);
+        HMI_DEBUG("wm:pm", "json_area_array len:%d", len_area);
+        HMI_DEBUG("wm:pm", "json_area_array dump:%s", json_object_get_string(json_area_array));
+
+        LayoutState layout_state;
+        AreaState area_state;
+        std::map<std::string, int> category_num;
+        for (int ctg_no = StmCtgNoMin;
+             ctg_no <= StmCtgNoMax; ctg_no++)
+        {
+            const char *ctg_name = kStmCategoryName[ctg_no];
+            category_num[ctg_name] = 0;
+        }
+
+        for (int j = 0; j < len_area; j++)
+        {
+            json_object *json_area = json_object_array_get_idx(json_area_array, j);
+
+            // Get area name
+            const char *area = this->getStringFromJson(json_area, "name");
+            if (nullptr == area)
+            {
+                HMI_ERROR("wm:pm", "Parse Error!!");
+                return -1;
+            }
+            area_state.name = std::string(area);
+            HMI_DEBUG("wm:pm", ">> area:%s", area);
+
+            // Get app attribute of the area
+            category = this->getStringFromJson(json_area, "category");
+            if (nullptr == category)
+            {
+                HMI_ERROR("wm:pm", "Parse Error!!");
+                return -1;
+            }
+            area_state.category = std::string(category);
+            category_num[category]++;
+            HMI_DEBUG("wm:pm", ">>> category:%s", category);
+
+            role = this->getStringFromJson(json_area, "role");
+            if (nullptr != role)
+            {
+                // Role is NOT essential here
+                area_state.role = std::string(role);
+            }
+            else
+            {
+                area_state.role = std::string("");
+            }
+            HMI_DEBUG("wm:pm", ">>> role:%s", role);
+
+            layout_state.area_list.push_back(area_state);
+        }
+
+        layout_state.name = layout;
+        layout_state.category_num = category_num;
+        this->default_layouts[layout] = layout_state;
+    }
+
+    // initialize for none layout
+    LayoutState none_layout_state;
+    memset(&none_layout_state, 0, sizeof(none_layout_state));
+    none_layout_state.name = "none";
+    this->default_layouts["none"] = none_layout_state;
+
+    // Check
+    for (auto itr_layout = this->default_layouts.begin();
+         itr_layout != this->default_layouts.end(); ++itr_layout)
+    {
+        HMI_DEBUG("wm:pm", ">>> layout:%s", itr_layout->first.c_str());
+
+        for (auto itr_area = itr_layout->second.area_list.begin();
+             itr_area != itr_layout->second.area_list.end(); ++itr_area)
+        {
+            HMI_DEBUG("wm:pm", ">>> >>> area    :%s", itr_area->name.c_str());
+            HMI_DEBUG("wm:pm", ">>> >>> category:%s", itr_area->category.c_str());
+            HMI_DEBUG("wm:pm", ">>> >>> role    :%s", itr_area->role.c_str());
+        }
+    }
+
+    // Release json_object
+    json_object_put(json_obj);
+
+    return 0;
+}
+
+static const int kHistoryNum = 5;
+void PolicyManager::pushRoleHistory(std::string category, std::string role)
+{
+    auto i = std::remove_if(this->role_history[category].begin(),
+                            this->role_history[category].end(),
+                            [role](std::string x) { return (role == x); });
+
+    if (this->role_history[category].end() != i)
+    {
+        this->role_history[category].erase(i);
+    }
+
+    this->role_history[category].push_back(role);
+
+    if (kHistoryNum < role_history[category].size())
+    {
+        this->role_history[category].erase(
+            this->role_history[category].begin());
+    }
+}
+
+std::string PolicyManager::popRoleHistory(std::string category)
+{
+    std::string role;
+    if (role_history[category].empty())
+    {
+        role = "";
+    }
+    else
+    {
+        role = this->role_history[category].back();
+        this->role_history[category].pop_back();
+    }
+    return role;
+}
+
+const char *PolicyManager::getStringFromJson(json_object *obj, const char *key)
+{
+    json_object *tmp;
+    if (!json_object_object_get_ex(obj, key, &tmp))
+    {
+        HMI_DEBUG("wm:pm", "Not found key \"%s\"", key);
+        return nullptr;
+    }
+
+    return json_object_get_string(tmp);
+}
+
+int PolicyManager::inputJsonFilie(const char *file, json_object **obj)
+{
+    const int input_size = 128;
+    int ret = -1;
+
+    HMI_DEBUG("wm:pm", "Input file: %s", file);
+
+    // Open json file
+    FILE *fp = fopen(file, "rb");
+    if (nullptr == fp)
+    {
+        HMI_ERROR("wm:pm", "Could not open file");
+        return ret;
+    }
+
+    // Parse file data
+    struct json_tokener *tokener = json_tokener_new();
+    enum json_tokener_error json_error;
+    char buffer[input_size];
+    int block_cnt = 1;
+    while (1)
+    {
+        size_t len = fread(buffer, sizeof(char), input_size, fp);
+        *obj = json_tokener_parse_ex(tokener, buffer, len);
+        if (nullptr != *obj)
+        {
+            HMI_DEBUG("wm:pm", "File input is success");
+            ret = 0;
+            break;
+        }
+
+        json_error = json_tokener_get_error(tokener);
+        if ((json_tokener_continue != json_error) || (input_size > len))
+        {
+            HMI_ERROR("wm:pm", "Failed to parse file (byte:%d err:%s)",
+                      (input_size * block_cnt), json_tokener_error_desc(json_error));
+            HMI_ERROR("wm:pm", "\n%s", buffer);
+            *obj = nullptr;
+            break;
+        }
+        block_cnt++;
+    }
+
+    // Close json file
+    fclose(fp);
+
+    // Free json_tokener
+    json_tokener_free(tokener);
+
+    return ret;
+}
+
+void PolicyManager::dumpLayerState(std::unordered_map<std::string, LayerState> &layers)
+{
+    HMI_DEBUG("wm:pm", "-------------------------------------------------------------------------------------------------------");
+    HMI_DEBUG("wm:pm", "|%-15s|%s|%-20s|%-20s|%-20s|%-20s|",
+              "LAYER", "C", "LAYOUT", "AREA", "CATEGORY", "ROLE");
+    for (const auto &itr : layers)
+    {
+        LayerState ls = itr.second;
+        const char* layer   = ls.name.c_str();
+        const char* changed = (ls.changed) ? "T" : "f";
+        const char* layout  = ls.layout_state.name.c_str();
+        bool first = true;
+        for (const auto &as : ls.layout_state.area_list)
+        {
+            if (first)
+            {
+                first = false;
+                HMI_DEBUG("wm:pm", "|%-15s|%1s|%-20s|%-20s|%-20s|%-20s|",
+                          layer, changed, layout,
+                          as.name.c_str(), as.category.c_str(), as.role.c_str());
+            }
+            else
+                HMI_DEBUG("wm:pm", "|%-15s|%1s|%-20s|%-20s|%-20s|%-20s|",
+                          "", "", "", as.name.c_str(), as.category.c_str(), as.role.c_str());
+        }
+    }
+    HMI_DEBUG("wm:pm", "-------------------------------------------------------------------------------------------------------");
+}
+
+void PolicyManager::dumpRoleHistory()
+{
+    HMI_DEBUG("wm:pm", ">>>>>>>>>> DUMP ROLE HISTORY ( category [older > newer] )");
+    for (int ctg_no = StmCtgNoMin; ctg_no <= StmCtgNoMax; ctg_no++)
+    {
+        if (ctg_no == StmCtgNoNone)
+            continue;
+
+        std::string category = std::string(kStmCategoryName[ctg_no]);
+
+        std::string str = category + " [ ";
+        for (const auto &i : this->role_history[category])
+            str += (i + " > ");
+
+        str += "]";
+        HMI_DEBUG("wm:pm", "%s", str.c_str());
+    }
+}
+
+std::vector<std::string> PolicyManager::parseString(std::string str, char delimiter)
+{
+    // Parse string by delimiter
+    std::vector<std::string> vct;
+    std::stringstream ss{str};
+    std::string buf;
+    while (std::getline(ss, buf, delimiter))
+    {
+        if (!buf.empty())
+        {
+            vct.push_back(buf);
+        }
+    }
+    return vct;
+}
+
+std::string PolicyManager::deleteSpace(std::string str)
+{
+    std::string ret = str;
+    size_t pos;
+    while ((pos = ret.find_first_of(" ")) != std::string::npos)
+    {
+        ret.erase(pos, 1);
+    }
+    return ret;
+}
+
+const char *PolicyManager::kDefaultRoleDb = "{ \
+    \"roles\":[ \
+    { \
+        \"category\": \"homescreen\", \
+        \"role\": \"homescreen\", \
+        \"area\": \"fullscreen\", \
+    }, \
+    { \
+        \"category\": \"map\", \
+        \"role\": \"map\", \
+        \"area\": \"normal.full | split.main\", \
+    }, \
+    { \
+        \"category\": \"general\", \
+        \"role\": \"launcher | poi | browser | sdl | mixer | radio | hvac | debug | phone | video | music\", \
+        \"area\": \"normal.full\", \
+    }, \
+    { \
+        \"category\": \"system\", \
+        \"role\": \"settings | dashboard\", \
+        \"area\": \"normal.full\", \
+    }, \
+    { \
+        \"category\": \"software_keyboard\", \
+        \"role\": \"software_keyboard\", \
+        \"area\": \"software_keyboard\", \
+    }, \
+    { \
+        \"category\": \"restriction\", \
+        \"role\": \"restriction\", \
+        \"area\": \"restriction.normal | restriction.split.main | restriction.split.sub\", \
+    }, \
+    { \
+        \"category\": \"pop_up\", \
+        \"role\": \"pop_up\", \
+        \"area\": \"on_screen\", \
+    }, \
+    { \
+        \"category\": \"system_alert\", \
+        \"role\": \"system_alert\", \
+        \"area\": \"on_screen\", \
+    } \
+    ] \
+}";
+
+const char *PolicyManager::kDefaultLayoutDb = "{ \
+    \"layouts\": [ \
+        { \
+            \"name\": \"homescreen\", \
+            \"layer\": \"far_homescreen\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"fullscreen\", \
+                    \"category\": \"homescreen\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"map.normal\", \
+            \"layer\": \"apps\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"normal.full\", \
+                    \"category\": \"map\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"map.split\", \
+            \"layer\": \"apps\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"split.main\", \
+                    \"category\": \"map\" \
+                }, \
+                { \
+                    \"name\": \"split.sub\", \
+                    \"category\": \"splitable\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"map.fullscreen\", \
+            \"layer\": \"apps\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"fullscreen\", \
+                    \"category\": \"map\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"splitable.normal\", \
+            \"layer\": \"apps\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"normal.full\", \
+                    \"category\": \"splitable\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"splitable.split\", \
+            \"layer\": \"apps\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"split.main\", \
+                    \"category\": \"splitable\" \
+                }, \
+                { \
+                    \"name\": \"split.sub\", \
+                    \"category\": \"splitable\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"general.normal\", \
+            \"layer\": \"apps\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"normal.full\", \
+                    \"category\": \"general\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"system.normal\", \
+            \"layer\": \"apps\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"normal.full\", \
+                    \"category\": \"system\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"software_keyboard\", \
+            \"layer\": \"near_homescreen\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"software_keyboard\", \
+                    \"category\": \"software_keyboard\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"restriction.normal\", \
+            \"layer\": \"restriction\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"restriction.normal\", \
+                    \"category\": \"restriction\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"restriction.split.main\", \
+            \"layer\": \"restriction\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"restriction.split.main\", \
+                    \"category\": \"restriction\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"restriction.split.sub\", \
+            \"layer\": \"restriction\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"restriction.split.sub\", \
+                    \"category\": \"restriction\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"pop_up\", \
+            \"layer\": \"on_screen\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"on_screen\", \
+                    \"category\": \"pop_up\" \
+                } \
+            ] \
+        }, \
+        { \
+            \"name\": \"system_alert\", \
+            \"layer\": \"on_screen\", \
+            \"areas\": [ \
+                { \
+                    \"name\": \"on_screen\", \
+                    \"category\": \"system_alert\" \
+                } \
+            ] \
+        } \
+    ] \
+}";
diff --git a/src/policy_manager/policy_manager.hpp b/src/policy_manager/policy_manager.hpp
new file mode 100644
index 0000000..1f69474
--- /dev/null
+++ b/src/policy_manager/policy_manager.hpp
@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2018 TOYOTA MOTOR CORPORATION
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef TMCAGLWM_POLICY_MANAGER_HPP
+#define TMCAGLWM_POLICY_MANAGER_HPP
+
+#include <functional>
+#include <unordered_map>
+#include <vector>
+#include <queue>
+
+struct json_object;
+struct sd_event;
+struct sd_event_source;
+struct StmState;
+
+class PolicyManager
+{
+
+  public:
+    explicit PolicyManager();
+    ~PolicyManager() = default;
+
+    using Handler = std::function<void(json_object *)>;
+
+    typedef struct
+    {
+        Handler onStateTransitioned;
+        Handler onError;
+    } CallbackTable;
+
+    int initialize();
+    void registerCallback(CallbackTable callback_table);
+    int setInputEventData(json_object *json_in);
+    int executeStateTransition();
+    void undoState();
+
+    // Do not use these functions
+    int transitionState(sd_event_source *source, void *data);
+    int timerEvent(sd_event_source *source, uint64_t usec, void *data);
+
+  private:
+    // Disable copy and move
+    PolicyManager(PolicyManager const &) = delete;
+    PolicyManager &operator=(PolicyManager const &) = delete;
+    PolicyManager(PolicyManager &&) = delete;
+    PolicyManager &operator=(PolicyManager &&) = delete;
+
+    typedef struct EventInfo
+    {
+        int event;
+        std::string role;
+        uint64_t delay;
+    } EventInfo;
+
+    typedef struct AreaState
+    {
+        std::string name;
+        std::string category;
+        std::string role;
+    } AreaState;
+
+    typedef std::vector<AreaState> AreaList;
+    typedef struct LayoutState
+    {
+        std::string name;
+        std::map<std::string, int> category_num;
+        AreaList area_list;
+    } LayoutState;
+
+    typedef struct LayerState
+    {
+        std::string name;
+        LayoutState layout_state;
+        bool changed;
+    } LayerState;
+
+    // Convert map
+    std::unordered_map<std::string, int> eventname2no;
+    std::unordered_map<std::string, int> categoryname2no;
+    std::unordered_map<std::string, int> areaname2no;
+
+    std::unordered_map<std::string, std::string> role2category;
+    std::unordered_map<std::string, std::string> category2role;
+    std::unordered_map<std::string, std::string> role2defaultarea;
+
+    struct sd_event *event_loop;
+    std::queue<EventInfo> event_info_queue;
+    std::map<int, struct sd_event_source *> event_source_list;
+    std::map<int, std::string> req_role_list;
+
+    CallbackTable callback;
+
+    std::unordered_map<std::string, LayerState> prv_layers;
+    std::unordered_map<std::string, LayerState> crr_layers;
+
+    std::unordered_map<std::string, LayoutState> default_layouts;
+
+    std::map<std::string, std::vector<std::string>> role_history;
+
+    void initializeState();
+    void initializeLayerState();
+    void updateState(int event_data, StmState crr_state);
+    void updateLayerState(int event_data, StmState crr_state);
+    void createOutputInformation(StmState crr_state, json_object **json_out);
+    int setStateTransitionProcessToSystemd(int event, uint64_t delay_ms, std::string role);
+
+    void pushRoleHistory(std::string category, std::string role);
+    std::string popRoleHistory(std::string category);
+
+    int loadRoleDb();
+    int loadLayoutDb();
+
+    void dumpLayerState(std::unordered_map<std::string, LayerState> &layers);
+    void dumpRoleHistory();
+
+    void addStateToJson(const char *name, bool changed,
+                        std::string state, json_object **json_out);
+    void addStateToJson(const char *layer_name, bool changed,
+                        AreaList area_list, json_object **json_out);
+    const char *getStringFromJson(json_object *obj, const char *key);
+    int inputJsonFilie(const char *file, json_object **obj);
+
+    std::vector<std::string> parseString(std::string str, char delimiter);
+    std::string deleteSpace(std::string str);
+
+    static const char *kDefaultRoleDb;
+    static const char *kDefaultLayoutDb;
+};
+
+#endif // TMCAGLWM_POLICY_MANAGER_HPP
diff --git a/src/policy_manager/stm/stub/src/CMakeLists.txt b/src/policy_manager/stm/stub/src/CMakeLists.txt
new file mode 100644
index 0000000..76b4eff
--- /dev/null
+++ b/src/policy_manager/stm/stub/src/CMakeLists.txt
@@ -0,0 +1,53 @@
+#
+# Copyright (c) 2017 TOYOTA MOTOR CORPORATION
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+include(FindPkgConfig)
+
+# We do not want a prefix for our module
+set(CMAKE_SHARED_MODULE_PREFIX "")
+
+set(TARGETS_STM libstm)
+
+add_library(${TARGETS_STM} MODULE
+   stm.c
+)
+
+target_include_directories(${TARGETS_STM}
+    PRIVATE
+        ./include
+)
+
+target_compile_definitions(${TARGETS_STM}
+    PRIVATE
+        _GNU_SOURCE
+)
+
+target_compile_options(${TARGETS_STM}
+    PRIVATE
+        -Wall -Wextra -Wno-unused-parameter -Wno-comment)
+
+set_target_properties(${TARGETS_STM}
+    PROPERTIES
+        C_EXTENSIONS OFF
+        C_STANDARD 99
+        C_STANDARD_REQUIRED ON
+)
+
+install(
+   TARGETS ${TARGET_STM}
+   DESTINATION ${CMAKE_INSTALL_LIBDIR}
+   COMPONENT "runtime"
+)
diff --git a/src/policy_manager/stm/stub/src/include/stm.h b/src/policy_manager/stm/stub/src/include/stm.h
new file mode 100644
index 0000000..5f672b1
--- /dev/null
+++ b/src/policy_manager/stm/stub/src/include/stm.h
@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2018 TOYOTA MOTOR CORPORATION
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef TMCAGLWM_STUB_STM_HPP
+#define TMCAGLWM_STUB_STM_HPP
+
+#define STM_TRUE 1
+#define STM_FALSE 0
+
+#define STM_CREATE_EVENT_ID(evt, ctg, area) \
+    ((evt) | ((ctg) << 8) | ((area) << 16))
+
+#define STM_GET_EVENT_FROM_ID(id) \
+    ((id) & 0xFF)
+
+#define STM_GET_CATEGORY_FROM_ID(id) \
+    (((id) >> 8) & 0xFF)
+
+#define STM_GET_AREA_FROM_ID(id) \
+    (((id) >> 16) & 0xFF)
+
+// Event number
+enum StmEvtNo {
+    StmEvtNoNone = 0,
+    StmEvtNoActivate,
+    StmEvtNoDeactivate,
+    StmEvtNoRestrictionModeOff,
+    StmEvtNoRestrictionMode1On,
+    StmEvtNoRestrictionMode2On,
+    StmEvtNoUndo,
+
+    StmEvtNoNum,
+
+    StmEvtNoMin = StmEvtNoNone,
+    StmEvtNoMax = StmEvtNoNum - 1,
+};
+
+// Category number
+enum StmCtgNo {
+    StmCtgNoNone = 0,
+    StmCtgNoHomescreen,
+    StmCtgNoMap,
+    StmCtgNoGeneral,
+    StmCtgNoSplitable,
+    StmCtgNoPopUp,
+    StmCtgNoSystemAlert,
+    StmCtgNoRestriction,
+    StmCtgNoSystem,
+    StmCtgNoSoftwareKeyboard,
+
+    StmCtgNoNum,
+
+    StmCtgNoMin = StmCtgNoNone,
+    StmCtgNoMax = StmCtgNoNum - 1,
+};
+
+// Area number
+enum StmAreaNo {
+    StmAreaNoNone = 0,
+    StmAreaNoFullscreen,
+    StmAreaNoNormal,
+    StmAreaNoSplitMain,
+    StmAreaNoSplitSub,
+    StmAreaNoOnScreen,
+    StmAreaNoRestrictionNormal,
+    StmAreaNoRestrictionSplitMain,
+    StmAreaNoRestrictionSplitSub,
+    StmAreaNoSoftwareKyeboard,
+
+    StmAreaNoNum,
+
+    StmAreaNoMin = StmAreaNoNone,
+    StmAreaNoMax = StmAreaNoNum - 1,
+};
+
+// Layer number
+enum StmLayerNo {
+    StmLayerNoHomescreen = 0,
+    StmLayerNoApps,
+    StmLayerNoNearHomescreen,
+    StmLayerNoRestriction,
+    StmLayerNoOnScreen,
+
+    StmLayerNoNum,
+
+    StmLayerNoMin = StmLayerNoHomescreen,
+    StmLayerNoMax = StmLayerNoNum - 1,
+};
+
+// Layout kind number
+enum StmLayoutNo {
+    StmLayoutNoNone = 0,
+    StmLayoutNoPopUp,
+    StmLayoutNoSysAlt,
+    StmLayoutNoMapNml,
+    StmLayoutNoMapSpl,
+    StmLayoutNoMapFll,
+    StmLayoutNoSplNml,
+    StmLayoutNoSplSpl,
+    StmLayoutNoGenNml,
+    StmLayoutNoHms,
+    StmLayoutNoRstNml,
+    StmLayoutNoRstSplMain,
+    StmLayoutNoRstSplSub,
+    StmLayoutNoSysNml,
+    StmLayoutNoSftKbd,
+
+    StmLayoutNoNum,
+
+    StmLayoutNoMin = StmLayoutNoNone,
+    StmLayoutNoMax = StmLayoutNoNum - 1,
+};
+
+// Mode kind number
+enum StmModeNo {
+    StmModeNoRestrictionMode = 0,
+
+    StmModeNoNum,
+
+    StmModeNoMin = StmModeNoRestrictionMode,
+    StmModeNoMax = StmModeNoNum - 1,
+};
+
+// Enum for mode state
+enum StmRestrictionModeSttNo {
+    StmRestrictionModeSttNoOff = 0,
+    StmRestrictionModeSttNo1On,
+    StmRestrictionModeSttNo2On,
+};
+
+// String for state
+extern const char* kStmEventName[];
+extern const char* kStmCategoryName[];
+extern const char* kStmAreaName[];
+extern const char* kStmLayoutName[];
+extern const char* kStmLayerName[];
+extern const char* kStmModeName[];
+extern const char** kStmModeStateNameList[];
+
+// Struct for state
+typedef struct StmBaseState {
+    int changed;
+    int state;
+} StmBaseState;
+
+typedef struct StmState {
+    StmBaseState mode[StmModeNoNum];
+    StmBaseState layer[StmLayerNoNum];
+} StmState;
+
+// API
+void stmInitialize();
+int stmTransitionState(int event_no, StmState* state);
+void stmUndoState();
+
+
+#endif  // TMCAGLWM_STUB_STM_HPP
diff --git a/src/policy_manager/stm/stub/src/stm.c b/src/policy_manager/stm/stub/src/stm.c
new file mode 100644
index 0000000..222dc91
--- /dev/null
+++ b/src/policy_manager/stm/stub/src/stm.c
@@ -0,0 +1,237 @@
+/*
+ * Copyright (c) 2018 TOYOTA MOTOR CORPORATION
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <string.h>
+#include "stm.h"
+
+const char* kStmEventName[] = {
+    "none",
+    "activate",
+    "deactivate",
+    "restriction_mode_off",
+    "restriction_mode_1_on",
+    "restriction_mode_2_on",
+    "undo",
+};
+
+const char* kStmCategoryName[] = {
+    "none",
+    "homescreen",
+    "map",
+    "general",
+    "splitable",
+    "pop_up",
+    "system_alert",
+    "restriction",
+    "system",
+    "software_keyboard",
+};
+
+const char* kStmAreaName[] = {
+    "none",
+    "fullscreen",
+    "normal",
+    "split.main",
+    "split.sub",
+    "on_screen",
+    "restriction.normal",
+    "restriction.split.main",
+    "restriction.split.sub",
+    "software_keyboard",
+};
+
+const char* kStmLayoutName[] = {
+    "none",
+    "pop_up",
+    "system_alert",
+    "map.normal",
+    "map.split",
+    "map.fullscreen",
+    "splitable.normal",
+    "splitable.split",
+    "general.normal",
+    "homescreen",
+    "restriction.normal",
+    "restriction.split.main",
+    "restriction.split.sub",
+    "system.normal",
+    "software_keyboard",
+};
+
+const char* kStmLayerName[] = {
+    "homescreen",
+    "apps",
+    "near_homescreen",
+    "restriction",
+    "on_screen",
+};
+
+const char* kStmModeName[] = {
+    "trans_gear",
+    "parking_brake",
+    "accel_pedal",
+    "running",
+    "lamp",
+    "lightstatus_brake",
+    "restriction_mode",
+};
+
+const char* kStmRestrictionModeStateName[] = {
+    "off",
+    "1on",
+    "2on",
+};
+
+const char** kStmModeStateNameList[] = {
+    kStmRestrictionModeStateName,
+};
+
+static StmState g_crr_state;
+static StmState g_prv_state;
+
+void stmInitialize() {
+    // Initialize previous state
+    memset(&g_prv_state, 0, sizeof(g_prv_state));
+
+    // Initialize current state
+    g_crr_state = g_prv_state;
+}
+
+int stmTransitionState(int event, StmState* state) {
+    int event_no, category_no;
+
+    event_no    = STM_GET_EVENT_FROM_ID(event);
+    category_no = STM_GET_CATEGORY_FROM_ID(event);
+
+    // Backup previous state
+    g_prv_state = g_crr_state;
+
+    // Clear current state
+    memset(&g_prv_state, 0, sizeof(g_prv_state));
+
+    // -------------------------------------------------------
+    // There is no policy table by default.
+    // Therefore update each layers
+    // to draw the applications in normal.full area
+    // in accordance with inputed activate/deactivate events.
+    // -------------------------------------------------------
+    if (StmEvtNoActivate == event_no)
+    {
+        if (StmCtgNoHomescreen == category_no)
+        {
+            g_crr_state.layer[StmLayerNoHomescreen].state = StmLayoutNoHms;
+            g_crr_state.layer[StmLayerNoHomescreen].changed = STM_TRUE;
+
+            g_crr_state.layer[StmLayerNoApps].state = StmLayoutNoNone;
+            g_crr_state.layer[StmLayerNoApps].changed = STM_TRUE;
+        }
+        else if (StmCtgNoMap == category_no)
+        {
+            g_crr_state.layer[StmLayerNoApps].state = StmLayoutNoMapNml;
+            g_crr_state.layer[StmLayerNoApps].changed = STM_TRUE;
+        }
+        else if (StmCtgNoGeneral == category_no)
+        {
+            g_crr_state.layer[StmLayerNoApps].state = StmLayoutNoGenNml;
+            g_crr_state.layer[StmLayerNoApps].changed = STM_TRUE;
+        }
+        else if (StmCtgNoSystem == category_no)
+        {
+            g_crr_state.layer[StmLayerNoApps].state = StmLayoutNoSysNml;
+            g_crr_state.layer[StmLayerNoApps].changed = STM_TRUE;
+        }
+        else if (StmCtgNoSplitable == category_no)
+        {
+            g_crr_state.layer[StmLayerNoApps].state = StmLayoutNoSplNml;
+            g_crr_state.layer[StmLayerNoApps].changed = STM_TRUE;
+        }
+        else if (StmCtgNoPopUp == category_no)
+        {
+            g_crr_state.layer[StmLayerNoOnScreen].state = StmLayoutNoPopUp;
+            g_crr_state.layer[StmLayerNoOnScreen].changed = STM_TRUE;
+        }
+        else if (StmCtgNoSystemAlert == category_no)
+        {
+            g_crr_state.layer[StmLayerNoOnScreen].state = StmLayoutNoSysAlt;
+            g_crr_state.layer[StmLayerNoOnScreen].changed = STM_TRUE;
+        }
+    }
+    else if (StmEvtNoDeactivate == event_no)
+    {
+        if (StmCtgNoHomescreen == category_no)
+        {
+            g_crr_state.layer[StmLayerNoHomescreen].state = StmLayoutNoNone;
+            g_crr_state.layer[StmLayerNoHomescreen].changed = STM_TRUE;
+        }
+        else if (StmCtgNoMap == category_no)
+        {
+            if (StmLayoutNoMapNml == g_prv_state.layer[StmLayerNoApps].state )
+            {
+                g_crr_state.layer[StmLayerNoApps].state = StmLayoutNoNone;
+                g_crr_state.layer[StmLayerNoApps].changed = STM_TRUE;
+            }
+        }
+        else if (StmCtgNoGeneral == category_no)
+        {
+            if (StmLayoutNoGenNml == g_prv_state.layer[StmLayerNoApps].state )
+            {
+                g_crr_state.layer[StmLayerNoApps].state = StmLayoutNoNone;
+                g_crr_state.layer[StmLayerNoApps].changed = STM_TRUE;
+            }
+        }
+        else if (StmCtgNoSystem == category_no)
+        {
+            if (StmLayoutNoSysNml == g_prv_state.layer[StmLayerNoApps].state )
+            {
+                g_crr_state.layer[StmLayerNoApps].state = StmLayoutNoNone;
+                g_crr_state.layer[StmLayerNoApps].changed = STM_TRUE;
+            }
+        }
+        else if (StmCtgNoSplitable == category_no)
+        {
+            if (StmLayoutNoSplNml == g_prv_state.layer[StmLayerNoApps].state )
+            {
+                g_crr_state.layer[StmLayerNoApps].state = StmLayoutNoNone;
+                g_crr_state.layer[StmLayerNoApps].changed = STM_TRUE;
+            }
+        }
+        else if (StmCtgNoPopUp == category_no)
+        {
+            if (StmLayoutNoPopUp == g_prv_state.layer[StmLayerNoOnScreen].state )
+            {
+                g_crr_state.layer[StmLayerNoOnScreen].state = StmLayoutNoNone;
+                g_crr_state.layer[StmLayerNoOnScreen].changed = STM_TRUE;
+            }
+        }
+        else if (StmCtgNoSystemAlert == category_no)
+        {
+            if (StmLayoutNoSysAlt == g_prv_state.layer[StmLayerNoOnScreen].state )
+            {
+                g_crr_state.layer[StmLayerNoOnScreen].state = StmLayoutNoNone;
+                g_crr_state.layer[StmLayerNoOnScreen].changed = STM_TRUE;
+            }
+        }
+    }
+
+    // Copy current state for return
+    memcpy(state, &g_crr_state, sizeof(g_crr_state));
+
+    return 0;
+}
+
+void stmUndoState() {
+    g_crr_state = g_prv_state;
+}