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// -*- C++ -*-
//=============================================================================
/**
* @file Incoming_Message_Queue.h
*
* $Id$
*
* @author Balachandran Natarajan <bala@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_INCOMING_MESSAGE_QUEUE_H
#define TAO_INCOMING_MESSAGE_QUEUE_H
#include "ace/pre.h"
#include "Pluggable_Messaging_Utils.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
/// Forward declarations
class ACE_Data_Block;
class TAO_ORB_Core;
class TAO_Queued_Data;
class TAO_Transport;
/**
* @class TAO_Incoming_Message_Queue
*
* @brief A queue of the messages in the incoming data path.
*
* Please read the documentation in the TAO_Transport class to find
* out more about the design of the incoming data path.
*
* Under certain conditions TAO may have to maintain a queue
* per-connection. This queue is drained by the pluggable
* protocols framework, normally under control of the ACE_Reactor, but
* other configurations are conceivable.
*
* The memory that is allocated for holding the messages comes from
* the global pool for the following reasons
*
* - the thread that reads a part of the message would not be the same
* thread that reads and fills the rest of the message
* - the thread that actually processes the message can be totally
* different.
*
*/
class TAO_Export TAO_Incoming_Message_Queue
{
public:
/// Contructor.
TAO_Incoming_Message_Queue (TAO_ORB_Core *orb_core);
/// Destructor.
~TAO_Incoming_Message_Queue (void);
/// Adding and deleting a node from the queue.
TAO_Queued_Data *dequeue_head (void);
TAO_Queued_Data *dequeue_tail (void);
int enqueue_tail (TAO_Queued_Data *nd);
/// Copy message from <block> to the tail of the queue. The size
/// of message that is copied to the tail node is returned. The
/// number of bytes copied depends on the amount of bytes needed to
/// make the tail node consistent.
size_t copy_tail (ACE_Message_Block &block);
/// Return the length of the queue..
CORBA::ULong queue_length (void);
/// Methods for sanity check. Checks to see whether the node on the
/// head or tail is complete or not and ready for further
/// processing.
int is_tail_complete (void);
int is_head_complete (void);
/// This method checks whether the last message that was queued up
/// was fragmented...
int is_tail_fragmented (void);
/// Return the size of data that is missing in tail of the queue.
size_t missing_data_tail (void) const;
/// void missing_data (size_t data);
private:
friend class TAO_Transport;
/// Make a node for the queue.
TAO_Queued_Data *get_node (void);
private:
/// A circular linked listof messages that await processing
TAO_Queued_Data *queued_data_;
/// The size of the queue
CORBA::ULong size_;
/// Copy of our ORB Core
TAO_ORB_Core *orb_core_;
};
/************************************************************************/
/**
* @class TAO_Queued_Data
*
* @brief Represents a node in the queue of incoming messages.
*
* This class contains necessary information about a message that is
* stored in the queue. Such a node can be used by the incoming thread
* from the reactor to dequeue and process the message by sending it
* to the higher layers of the ORB.
*/
class TAO_Export TAO_Queued_Data
{
public:
/// Default Constructor
TAO_Queued_Data (void);
/// Constructor.
TAO_Queued_Data (ACE_Message_Block *mb);
/// Copy constructor.
TAO_Queued_Data (const TAO_Queued_Data &qd);
/// Creation and deletion of a node in the queue.
static TAO_Queued_Data* get_queued_data (void);
static void release (TAO_Queued_Data *qd);
/// Duplicate ourselves. This creates a copy of ourselves on the
/// heap and returns a pointer to the duplicated node.
static TAO_Queued_Data* duplicate (TAO_Queued_Data &qd);
/// The message block that contains the message.
ACE_Message_Block *msg_block_;
/// Data missing in the above message that hasn't been read or
/// processed yet.
CORBA::Long missing_data_;
/// The byte order of the message that is stored in the node..
CORBA::Octet byte_order_;
/// Many protocols like GIOP have a major and minor version
/// information that would be needed to read and decipher the
/// message.
CORBA::Octet major_version_;
CORBA::Octet minor_version_;
/// Some messages can be fragmented by the protocol (this is an ORB
/// level fragmentation on top of the TCP/IP fragmentation. This
/// member indicates whether the message that we have recd. and
/// queue already has more fragments that is missing..
CORBA::Octet more_fragments_;
/// The message type of the message
TAO_Pluggable_Message_Type msg_type_;
/// Pounter to the next element in the queue.
TAO_Queued_Data *next_;
};
#if defined (__ACE_INLINE__)
# include "Incoming_Message_Queue.inl"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /*TAO_INCOMING_MESSAGE_QUEUE_H*/
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