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// -*- C++ -*-
//=============================================================================
/**
* @file Incoming_Message_Queue.h
*
* @author Balachandran Natarajan <bala@cs.wustl.edu>
*/
//=============================================================================
#ifndef TAO_INCOMING_MESSAGE_QUEUE_H
#define TAO_INCOMING_MESSAGE_QUEUE_H
#include /**/ "ace/pre.h"
#include "tao/Pluggable_Messaging_Utils.h"
#include "ace/Message_Block.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
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:
/// Constructor.
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);
/// Return the length of the queue..
CORBA::ULong queue_length (void) const;
private:
friend class TAO_Transport;
private:
/*!
\brief A circular linked list of messages awaiting processing.
\a last_message_added_ points to the most recent message added to
the list. The earliest addition can be easily accessed via
\a last_message_added_->next_.
*/
TAO_Queued_Data *last_added_;
/// The size of the queue
CORBA::ULong size_;
/// Copy of our ORB Core
TAO_ORB_Core *orb_core_;
};
/// Constant value indicating that the correct value is unknown yet,
/// probably parsing the header failed due to insufficient data in buffer.
const size_t TAO_MISSING_DATA_UNDEFINED = ~((size_t) 0); // MAX_SIZE_T
TAO_END_VERSIONED_NAMESPACE_DECL
#if defined (__ACE_INLINE__)
# include "tao/Incoming_Message_Queue.inl"
#endif /* __ACE_INLINE__ */
#include /**/ "ace/post.h"
#endif /*TAO_INCOMING_MESSAGE_QUEUE_H*/
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