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/*
* Copyright (C) 2007-2008 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_PROGRAMLINK_H
#define BU_PROGRAMLINK_H
#include "bu/linkmessage.h"
#include "bu/programchain.h"
namespace Bu
{
/**
* Program Link is the base class for any object that will be a piece of the
* main program chain loop.
*/
class ProgramLink
{
friend class Bu::ProgramChain;
public:
/**
* Construct a program link.
*/
ProgramLink();
/**
* Deconstruct.
*/
virtual ~ProgramLink();
/**
* Initialization code required for a link that wasn't performed in the
* constructor.
*@returns true if initialization was successful. A false value will halt
* the chain.
*/
virtual bool init()=0;
/**
* DeInitialization code that should happen, but doesn't belong in the
* destructor.
*@returns true means everything worked, false means failure, but is
* meaningless.
*/
virtual bool deInit()=0;
/**
* Executed once per link per chain pass. Contains the guts of the program.
*@returns true if everything went well. A false value will halt the chain.
*/
virtual bool timeSlice()=0;
/**
* This must be handled in order to process Instant Response Messages.
* This function should return null on all messages that it doesn't
* understand how to handle, and construct new messages to return to sender
* in the cases where it does understand.
*@param pMsgIn The message that must be processed.
*@returns Either a new message in cases where a response is required,
* or null if nothing needs to be done by this link.
*/
virtual LinkMessage *processIRM( LinkMessage *pMsgIn ) = 0;
/**
* Broadcast a LinkMessage to all other links in the system. Each other
* link will get a call of their processIRM function. If the message gets
* a response then you will regain control immediately, otherwise the system
* will give all other Links a chance to respond before returning NULL.
*@param pMsgOut The message to broadcast.
*@returns The message response, or NULL if no Link understood your message.
*/
LinkMessage *sendIRM( LinkMessage *pMsgOut );
private:
/**
* Set which chain we're assosiated with. This is how IRM messages make
* it out to the rest of the world.
*@param pNewChain A pointer to the containing program chain.
*/
void setChain( class ProgramChain *pNewChain );
/**
* The pointer to the containing chain.
*/
class ProgramChain *pChain;
/*
void postMessage( LinkMessage *pMsg, int nLvl );
LinkMessage *getMessage( int nLvl );
enum
{
msgToChain,
msgToLink
};
private:
Queue qMsgToChain;
Queue qMsgToLink;
*/
};
}
#endif
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