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>

1 files changed, 144 insertions, 0 deletions

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