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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"
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 hasBool;
bool boolVal;
bool hasNum;
double numVal;
bool hasStr;
std::string strVal;
};
/// @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_;
long long int timestamp_;
struct signalValue value_;
std::map<long long int, struct signalValue> history_; ///< history_ - Hold signal value history in map with <timestamp, value>
double frequency_;
std::string unit_;
CtlActionT* onReceived_;
json_object* getSignalsArgs_;
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, double frequency, CtlActionT* onReceived, json_object* getSignalsArgs);
Signal(const std::string& id, std::vector<std::string>& depends, const std::string& unit, double frequency, CtlActionT* onReceived);
explicit operator bool() const;
bool operator==(const Signal& other) const;
bool operator==(const std::string& aName) const;
const std::string id() const;
json_object* toJSON() const;
void set(long long int timestamp, struct signalValue& value);
void update(Signal* sig);
int onReceivedCB(json_object *queryJ);
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() const;
int initialRecursionCheck();
int recursionCheck(Signal* obs);
};
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