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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace/RMCast
//
// = AUTHOR
// Carlos O'Ryan <coryan@uci.edu>
//
// ============================================================================
#ifndef ACE_RMCAST_RECEIVER_MODULE_H
#define ACE_RMCAST_RECEIVER_MODULE_H
#include "ace/pre.h"
#include "RMCast_Module.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
/// Keep track of the receiver module.
/**
* A receiver proxy must reject invalid messages and communicate with
* the sender to join and leave the multicast group.
*
* This module performs all the task related to
*
*/
class ACE_RMCast_Export ACE_RMCast_Receiver_Module : public ACE_RMCast_Module
{
public:
//! Constructor
ACE_RMCast_Receiver_Module (void);
//! Destructor
virtual ~ACE_RMCast_Receiver_Module (void);
virtual int data (ACE_RMCast::Data &);
virtual int poll (ACE_RMCast::Poll &);
virtual int ack_join (ACE_RMCast::Ack_Join &);
virtual int ack_leave (ACE_RMCast::Ack_Leave &);
virtual int ack (ACE_RMCast::Ack &);
virtual int join (ACE_RMCast::Join &);
virtual int leave (ACE_RMCast::Leave &);
/// Simple enum used to describe the receiver state transitions
/**
* Receivers go through several states before they can fully accept
* messages, the following comments describe those states, as well as
* the possible transitions
* This configuration is pesimistic, any invalid message is cause
* enough to reclaim all the resources. This partially addresses
* situations where either accidentally or intentionally a sender is
* multicasting packets to the wrong group.
<CODE>
NON_EXISTENT JOINING JOINED LEAVING<BR>
----------------------------------------------------------------<BR>
<BR>
DATA JOINING JOINING JOINED LEAVING<BR>
Send/Join Send/Join Recv/Data Send/Leave<BR>
<BR>
POLL JOINING JOINING JOINED LEAVING<BR>
Send/Join Send/Join Send/Ack Send/Leave<BR>
<BR>
ACK_JOIN JOINING JOINED JOINED LEAVING<BR>
Send/Join Receive Msg Receive Msg Send/Leave<BR>
<BR>
ACK_LEAVE NON_EXISTENT NON_EXISTENT NON_EXISTENT NON_EXISTENT<BR>
Noop Destroy Destroy Destroy<BR>
<BR>
ACK NON_EXISTENT NON_EXISTENT NON_EXISTENT NON_EXISTENT<BR>
Noop Destroy Destroy Destroy<BR>
<BR>
JOIN NON_EXISTENT NON_EXISTENT NON_EXISTENT NON_EXISTENT<BR>
Noop Destroy Destroy Destroy<BR>
<BR>
LEAVE NON_EXISTENT NON_EXISTENT NON_EXISTENT NON_EXISTENT<BR>
Noop Destroy Destroy Destroy<BR>
<BR>
</CODE>
*/
enum Receiver_State
{
RS_NON_EXISTENT,
RS_JOINING,
RS_JOINED,
RS_LEAVING
};
private:
/// Enter the leaving state, prepare for termination
void leaving (ACE_RMCast_Proxy *proxy);
private:
/// The current state of the receiver
int state_;
};
#if defined (__ACE_INLINE__)
#include "RMCast_Receiver_Module.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /* ACE_RMCAST_RECEIVER_MODULE_H */
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