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/*
* Copyright (c) 2000 - 2015 Samsung Electronics Co., Ltd All Rights Reserved
*
* 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
*/
/*
* @file communication-manager.h
* @author Krzysztof Jackiewicz (k.jackiewicz@samsung.com)
* @version 1.0
*/
#pragma once
#include <functional>
#include <list>
#include <noncopyable.h>
namespace CKM {
/*
* class responsible for keeping a list of listeners for given M type of message and notifying them
*/
template <typename M>
class MessageManager {
public:
NONCOPYABLE(MessageManager);
// Listener is an object callable with const M& as argument
template <typename L>
void Register(L &&listener)
{
m_listeners.push_back(std::move(listener));
}
// Sends message of type M to all registered listeners
// Returns the number of listeners called
size_t SendMessage(const M &msg) const
{
for (auto &it : m_listeners)
it(msg);
return m_listeners.size();
}
protected:
MessageManager() {}
// No one is going to destroy this class directly (only via inherited class). Hence no 'virtual'
~MessageManager() {}
private:
std::list<std::function<void(const M &)>> m_listeners;
};
// generic template declaration
template <typename... Args>
struct CommunicationManager;
/*
* Class that combines MessageManagers of all requested Message types into a single object. Examples
* can be found in tests (test_msg-manager.cpp)
*/
template <typename First, typename... Args>
struct CommunicationManager<First, Args...> :
public MessageManager<First>, public CommunicationManager<Args...> {
public:
CommunicationManager() {}
NONCOPYABLE(CommunicationManager);
// M - message type, L - listener to register
template <typename M, typename L>
void Register(L &&listener)
{
MessageManager<M>::Register(std::move(listener));
}
// M message type
// Sending a message calls an unknown listener callback on the receiving side. It may throw.
template <typename M>
size_t SendMessage(const M &msg) const
{
return MessageManager<M>::SendMessage(msg);
}
};
// stop condition for recursive inheritance
template <>
struct CommunicationManager<> {
};
} /* namespace CKM */
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