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// $Id$
// ============================================================================
//
// = DESCRIPTION
// Helper class used in the reassembly layer of the realiable
// multicast library.
//
// = AUTHOR
// Carlos O'Ryan <coryan@uci.edu>
//
// ============================================================================
#ifndef ACE_RMCAST_PARTIAL_MESSAGE_H
#define ACE_RMCAST_PARTIAL_MESSAGE_H
#include "ace/pre.h"
#include "RMCast_Export.h"
#include "ace/Task.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#ifndef ACE_RMCAST_DEFAULT_HOLE_COUNT
#define ACE_RMCAST_DEFAULT_HOLE_COUNT 16
#endif /* ACE_RMCAST_DEFAULT_HOLE_COUNT */
//! Represent a partially received message in the
//! ACE_RMCast_Reassembly module
/*!
* This class provides temporary storage for the fragments as they are
* received in the ACE_RMCast_Reassembly module. It also keeps track
* of what portions of the message are still missing.
*/
class ACE_RMCast_Export ACE_RMCast_Partial_Message
{
public:
//! Constructor, reserve enough memory for the complete message
ACE_RMCast_Partial_Message (ACE_UINT32 message_size);
//! Destructor
~ACE_RMCast_Partial_Message (void);
//! Process a fragment
/*!
* A fragment starting at <offset> has been received, copy the
* fragment contents and update the list of holes.
*/
int fragment_received (ACE_UINT32 message_size,
ACE_UINT32 offset,
ACE_Message_Block *mb);
//! Return 1 if the message is complete
int is_complete (void) const;
//! Return the body of the message, the memory is *not* owned by the
//! caller
ACE_Message_Block *message_body (void);
private:
//! Insert a new hole into the list
/*!
* The class keeps an array to represent the missing portions of the
* message. This method inserts a new hole, i.e. a new element in
* the array at index <i>. The <start> and <end> arguments represent
* the offsets of the missing portion of the message.
*/
int insert_hole (size_t i,
ACE_UINT32 start,
ACE_UINT32 end);
//! Remove a hole from the list
int remove_hole (size_t i);
private:
//! Maintain the message storage
ACE_Message_Block message_body_;
//! Represent a missing portion of a message
struct Hole
{
//! Offset where the missing portion of the message starts
ACE_UINT32 start;
//! Offset where the missing portion of the message ends
ACE_UINT32 end;
};
//! Implement a growing array of Hole structures
//@{
Hole *hole_list_;
size_t max_hole_count_;
size_t hole_count_;
//@}
};
#if defined (__ACE_INLINE__)
#include "RMCast_Partial_Message.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /* ACE_RMCAST_PARTIAL_MESSAGE_H */
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