NptSelectableMessageQueue.h

/*****************************************************************
|
|   Neptune - Selectable Message Queue
|
| Copyright (c) 2002-2008, Axiomatic Systems, LLC.
| All rights reserved.
|
| Redistribution and use in source and binary forms, with or without
| modification, are permitted provided that the following conditions are met:
|     * Redistributions of source code must retain the above copyright
|       notice, this list of conditions and the following disclaimer.
|     * Redistributions in binary form must reproduce the above copyright
|       notice, this list of conditions and the following disclaimer in the
|       documentation and/or other materials provided with the distribution.
|     * Neither the name of Axiomatic Systems nor the
|       names of its contributors may be used to endorse or promote products
|       derived from this software without specific prior written permission.
|
| THIS SOFTWARE IS PROVIDED BY AXIOMATIC SYSTEMS ''AS IS'' AND ANY
| EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
| DISCLAIMED. IN NO EVENT SHALL AXIOMATIC SYSTEMS BE LIABLE FOR ANY
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 ****************************************************************/

#ifndef _NPT_SELECTABLE_MESSAGE_QUEUE_H_
#define _NPT_SELECTABLE_MESSAGE_QUEUE_H_

/*----------------------------------------------------------------------
|   includes
+---------------------------------------------------------------------*/
#include "NptMessaging.h"
#include "NptSimpleMessageQueue.h"

/*----------------------------------------------------------------------
|   NPT_SelectableMessageQueue
+---------------------------------------------------------------------*/
class NPT_SelectableMessageQueue : public NPT_SimpleMessageQueue
{
public:
    // methods
             NPT_SelectableMessageQueue();
    ~NPT_SelectableMessageQueue() override;
    
    // NPT_MessageQueue methods
    NPT_Result PumpMessage(NPT_Timeout timeout = NPT_TIMEOUT_INFINITE) override;
    NPT_Result QueueMessage(NPT_Message*        message,
                                    NPT_MessageHandler* handler) override;

    // methods
    int  GetEventFd() { return m_Pipe[0]; }
 
private:
    // methods
    NPT_Result FlushEvent();

    // members
    int m_Pipe[2];
};


#endif /* _NPT_SELECTABLE_MESSAGE_QUEUE_H_ */