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/*
* Copyright (C) 2015, 2016 "IoT.bzh"
* Author "Romain Forlot" <romain.forlot@iot.bzh>
*
* 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.
*/
#pragma once
#include <map>
#include <string>
#include <vector>
#include <ctl-config.h>
#include "observer-pattern.hpp"
#define NANO 1000000000
class Composer;
/// @brief Structure holding a possible value of a Signal
/// as it could be different type of value, we declare all
/// possibility.
/// Not very efficient or optimized, maybe use of Variant in
/// C++17 but this is a bit too new to uses it for now
struct signalValue {
bool undefined;
bool hasBool;
bool boolVal;
bool hasNum;
double numVal;
bool hasStr;
std::string strVal;
signalValue():
undefined(true), hasBool(false), boolVal(false), hasNum(false), numVal(0), hasStr(false), strVal("") {};
signalValue(bool b):
undefined(false), hasBool(true), boolVal(b), hasNum(false), numVal(0), hasStr(false), strVal("") {};
signalValue(int i):
undefined(false), hasBool(false), boolVal(false), hasNum(true), numVal(i), hasStr(false), strVal("") {};
signalValue(double d):
undefined(false), hasBool(false), boolVal(false), hasNum(true), numVal(d), hasStr(false), strVal("") {};
signalValue(const std::string& s):
undefined(false), hasBool(false), boolVal(false), hasNum(false), numVal(0), hasStr(true), strVal(s) {};
};
extern "C" void searchNsetSignalValueHandle(const char* aName, uint64_t timestamp, struct signalValue value);
extern "C" void setSignalValueHandle(void* aSignal, uint64_t timestamp, struct signalValue value);
/// @brief Holds composer callbacks and obj to manipulate
struct signalCBT
{
void (*searchNsetSignalValue)(const char* aName, uint64_t timestamp, struct signalValue value);
void (*setSignalValue)(void* aSignal, uint64_t timestamp, struct signalValue value);
void* aSignal;
void* pluginCtx;
};
/// @brief Holds a signal (raw or virtual) definition. Value could be of
/// different types, so an intermediate structure is use to store them.
/// A signal could also be a subject or an observer at the same time, this
/// is the behavior retained to compose virtual signals based on raw signals.
/// And this is the way that is used to update and reacts to an underlaying
/// signal change.
class Signal: public Observable<Signal>, public Observer<Signal>
{
private:
std::string id_;
std::string event_;
std::vector<std::string> dependsSigV_;
uint64_t timestamp_;
struct signalValue value_;
std::map<uint64_t, struct signalValue> history_; ///< history_ - Hold signal value history in map with <timestamp, value>
int retention_;
double frequency_;
std::string unit_;
json_object* metadata_;
CtlActionT* onReceived_;
json_object* getSignalsArgs_;
struct signalCBT signalCtx_;
public:
bool subscribed_; ///< subscribed_ - boolean value telling if yes or no the signal has been subcribed to the low level binding.
Signal();
Signal(const std::string& id, const std::string& event, std::vector<std::string>& depends, const std::string& unit, json_object *metadata, int retention, double frequency, CtlActionT* onReceived, json_object* getSignalsArgs);
~Signal();
explicit operator bool() const;
bool operator==(const Signal& other) const;
bool operator!=(const Signal& other) const;
bool operator==(const std::string& aName) const;
bool operator!=(const std::string& aName) const;
const std::string id() const;
json_object* toJSON() const;
struct signalCBT* get_context();
json_object *getSignalsArgs();
void set(uint64_t timestamp, struct signalValue& value);
void update(Signal* sig);
static int defaultOnReceivedCB(CtlSourceT* source, json_object* argsJ, json_object *queryJ);
void defaultReceivedCB(json_object *eventJ);
void onReceivedCB(json_object *eventJ);
void attachToSourceSignals(Composer& composer);
double average(int seconds = 0) const;
double minimum(int seconds = 0) const;
double maximum(int seconds = 0) const;
struct signalValue last_value() const;
uint64_t last_timestamp() const;
int initialRecursionCheck();
int recursionCheck(Signal* obs);
};
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