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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "imessagehandler.h"
#include "ireplyhandler.h"
#include "queue.h"
#include "routable.h"
#include "message.h"
#include "reply.h"
#include <mutex>
#include <condition_variable>
namespace mbus {
/**
* A RoutableQueue is a queue of Routable objects that also implements
* the IMessageHandler and IReplyHandler APIs. This class is included
* as a convenience for application developers that does not want to
* write their own Message and Reply handlers for use with session
* objects. Note that a RoutableQueue cannot be copied and that it
* owns all objects currently on the queue. The RoutableQueue class is
* thread-safe.
**/
class RoutableQueue : public IMessageHandler,
public IReplyHandler
{
private:
std::mutex _lock;
std::condition_variable _cond;
Queue<Routable*> _queue;
public:
/**
* Create an empty queue.
**/
RoutableQueue();
/**
* The destructor will delete any objects still on the queue.
**/
~RoutableQueue() override;
/**
* Obtain the number of elements currently in this queue. Note
* that the return value of this method may become invalid really
* fast if the queue is used by multiple threads.
*
* @return current queue size
**/
uint32_t size();
/**
* Enqueue a routable on this queue.
*
* @param r the Routable to enqueue
**/
void enqueue(Routable::UP r);
/**
* Dequeue a routable from this queue. This method will block if
* the queue is currently empty. The 'timeout' parameter
* indicate how long to wait for something to be enqueued. If 0 is
* given as timeout, this method will not block at all, making it
* perform a simple poll. If the dequeue operation times out, the
* returned auto-pointer will point to 0.
*
* @return the dequeued routable
* @param timeout how long to wait if the queue is empty
**/
Routable::UP dequeue(duration timeout);
Routable::UP dequeue() { return dequeue(duration::zero());}
/**
* Handle a Message by enqueuing it.
*
* @param msg the Message to handle
**/
void handleMessage(Message::UP msg) override;
/**
* Handle a Reply by enqueuing it.
*
* @param reply the Reply to handle
**/
void handleReply(Reply::UP reply) override;
};
} // namespace mbus
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