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/* -*- C++ -*- */
//=============================================================================
/**
* @file IO_Event_Handler.h
*
* $Id$
*
* @author Balachandran Natarajan <bala@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_ACE_IO_EVENT_HANDLER_H
#define TAO_ACE_IO_EVENT_HANDLER_H
#include "ace/pre.h"
#include "IO_Event_Masks.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "Reactive_Handler.h"
/**
* @class TAO_ACE_IO_Event_Handler
*
* @brief Provides an abstract interface for handling socket events.
*
* @@ todo<Bala>: Write comments
*/
class TAO_ACE_Export TAO_ACE_IO_Event_Handler: public TAO_ACE_Reactive_Handler
{
public:
/* Callback function that invokes the right callback method based
* on the type of mask that is passed via <t>. The mask should
* indicate only one event. Sending a bitwise 'or' or 'and' of many
* events will lead to none of the events being handled.
*/
virtual int handle_event (TAO_ACE_IO_Event_Masks::Event_Masks t =
TAO_ACE_IO_Event_Masks::NULL_MASK);
/// Get/Set the handle of the underlying socket
virtual ACE_HANDLE get_handle (void) = 0;
virtual void set_handle (ACE_HANDLE h) = 0;
protected:
/// Called when input events occur (e.g., connection or data).
virtual int handle_input (ACE_HANDLE fd = ACE_INVALID_HANDLE) = 0;
/// Called when output events are possible (e.g., when flow control
/// abates or non-blocking connection completes).
virtual int handle_output (ACE_HANDLE fd = ACE_INVALID_HANDLE) = 0;
/// Called when an exceptional events occur (e.g., SIGURG).
virtual int handle_exception (ACE_HANDLE fd = ACE_INVALID_HANDLE) = 0;
private:
};
#include "ace/post.h"
#endif /*TAO_ACE_IO_EVENT_HANDLER_H*/
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