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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// RMCast.h
//
// = AUTHOR
// Carlos O'Ryan <coryan@uci.edu>
//
// ============================================================================
#ifndef ACE_RMCAST_H
#define ACE_RMCAST_H
#include "ace/pre.h"
#include "ace/OS.h"
#include "RMCast_Export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
class ACE_Message_Block;
class ACE_RMCast_Export ACE_RMCast
{
public:
// Message formats
// From SENDER to RECEIVER
//
// POLL
// +---------+----------------------+
// | 8 bits | MT_POLL |
// +---------+----------------------+
//
// ACK_JOIN
// +---------+----------------------+
// | 8 bits | MT_ACK_JOIN |
// +---------+----------------------+
// | 32 bits | next_sequence_number |
// +---------+----------------------+
//
// ACK_LEAVE
// +---------+----------------------+
// | 8 bits | ACK_LEAVE |
// +---------+----------------------+
//
// DATA
// +---------+----------------------+
// | 8 bits | DATA |
// +---------+----------------------+
// | 32 bits | sequence_number |
// +---------+----------------------+
// | 32 bits | message_size |
// +---------+----------------------+
// | 32 bits | fragment_offset |
// +---------+----------------------+
// | 32 bits | payload_size |
// +---------+----------------------+
// | | payload |
// +---------+----------------------+
//
// From RECEIVER to SENDER
//
// MT_JOIN
// +---------+----------------------+
// | 8 bits | MT_JOIN |
// +---------+----------------------+
//
// MT_LEAVE
// +---------+----------------------+
// | 8 bits | MT_LEAVE |
// +---------+----------------------+
//
// MT_ACK
// +---------+----------------------+
// | 8 bits | MT_ACK |
// +---------+----------------------+
// | 32 bits | last_successful |
// +---------+----------------------+
// | 32 bits | last_received |
// +---------+----------------------+
//
enum Message_Type
{
// Sender initiated
MT_POLL,
MT_ACK_JOIN,
MT_ACK_LEAVE,
MT_DATA,
// Receiver initiated
MT_JOIN,
MT_LEAVE,
MT_ACK,
MT_LAST
};
enum Receiver_State
{
RS_NON_EXISTENT,
RS_JOINING,
RS_JOINED,
RS_LEAVING
};
// State transition (and actions) for the receivers.
// 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.
//
// NON_EXISTENT JOINING JOINED LEAVING
// ----------------------------------------------------------------
// POLL JOINING JOINING JOINED LEAVING
// Send/Join Send/Join Send/Ack Send/Leave
//
// ACK NON_EXISTENT NON_EXISTENT NON_EXISTENT NON_EXISTENT
// Noop Destroy Destroy Destroy
//
// JOIN NON_EXISTENT NON_EXISTENT NON_EXISTENT NON_EXISTENT
// Noop Destroy Destroy Destroy
//
// LEAVE NON_EXISTENT NON_EXISTENT NON_EXISTENT NON_EXISTENT
// Noop Destroy Destroy Destroy
//
// ACK_JOIN JOINING JOINED JOINED LEAVING
// Send/Join Update ACT Update ACT Send/Leave
//
// ACK_LEAVE NON_EXISTENT NON_EXISTENT NON_EXISTENT NON_EXISTENT
// Noop Destroy Destroy Destroy
//
// SEND_DATA JOINING JOINING JOINED LEAVING
// Send/Join Send/Join Recv/Data Send/Leave
//
enum Sender_State
{
SS_NON_EXISTENT,
SS_JOINED
};
// State transition (and actions) for the senders.
// 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.
//
// NON_EXISTENT JOINED
// ------------------------------------------
// POLL NON_EXISTENT NON_EXISTENT
// Destroy Destroy
//
// ACK NON_EXISTENT JOINED
// Noop Process/Ack
//
// JOIN JOINED NON_EXISTENT
// Send/Join_Ack Send/Join_Ack
//
// LEAVE NON_EXISTENT NON_EXISTENT
// Send/Leave_Ack Send/Leave_Ack
// Destroy
//
// ACK_JOIN NON_EXISTENT NON_EXISTENT
// Noop Destroy
//
// ACK_LEAVE NON_EXISTENT NON_EXISTENT
// Noop Destroy
//
// SEND_DATA NON_EXISTENT NON_EXISTENT
// Noop Destroy
//
// These structures define the basic layout of the messages.
struct Data
{
// Source ID is implicit in recvfrom()...
ACE_UINT32 sequence_number;
ACE_UINT32 total_size;
ACE_UINT32 fragment_offset;
// @@ TODO: we may want to add optional fields, such as:
// - Polling clients for their status
// - Sending the range of messages in the queue
// - If we are using authentic group communication we may
// piggyback the ACK / NAK messages
ACE_Message_Block *payload;
};
struct Ack
{
ACE_UINT32 expected;
ACE_UINT32 last_received;
};
struct Join
{
};
struct Leave
{
};
struct Ack_Join
{
ACE_INT32 next_sequence_number;
};
struct Ack_Leave
{
};
};
#if defined (__ACE_INLINE__)
#include "RMCast.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /* ACE_RMCAST_H */
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