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// -*- C++ -*-
//=============================================================================
/**
* @file Stream_Modules.h
*
* @author Douglas C. Schmidt <d.schmidt@vanderbilt.edu>
*/
//=============================================================================
// This needs to go outside of the #if !defined() block. Don't ask...
#include "ace/Task.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#ifndef ACE_STREAM_MODULES
#define ACE_STREAM_MODULES
#include /**/ "ace/pre.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Stream_Head
*
* @brief Standard task that acts as reader or writer at the head of
* an ACE_Stream.
*
* A ACE_Message_Block sent to this task (via its put() hook) triggers
* actions depending on the block type and whether the task is acting as
* a reader or a writer. If the block is of type ACE_Message_Block::MB_IOCTL,
* the block's is assumed to contain (beginning at its rd_ptr()) an
* ACE_IO_Cntl_Msg object and is processed accordingly. This is usually
* used to set the task's message queue high water and/or low water marks.
*
* When the block is not ACE_Message_Block::MB_IOCTL, processing depends on
* the ACE_Stream_Head's role in the module:
*
* - Reader: If the block is of type ACE_Message_Block::MB_FLUSH, the
* canonical_flush() method is called.
* (@see ACE_Stream::canonical_flush().) If the block is any other
* type, it is queued on this task's message queue. It would thus
* be available to caller's reading blocks from the containing
* stream.
* - Writer: The block is passed to the next module in the stream.
*/
template <ACE_SYNCH_DECL, class TIME_POLICY = ACE_System_Time_Policy>
class ACE_Stream_Head : public ACE_Task<ACE_SYNCH_USE, TIME_POLICY>
{
public:
/// Construction
ACE_Stream_Head ();
/// Destruction
virtual ~ACE_Stream_Head ();
// = ACE_Task hooks
virtual int open (void *a = 0);
virtual int close (u_long flags = 0);
virtual int put (ACE_Message_Block *msg, ACE_Time_Value * = 0);
virtual int svc ();
// = Dynamic linking hooks
virtual int init (int argc, ACE_TCHAR *argv[]);
virtual int info (ACE_TCHAR **info_string, size_t length) const;
virtual int fini ();
/// Dump the state of an object.
void dump () const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
private:
/// Performs canonical flushing at the ACE_Stream Head.
int control (ACE_Message_Block *);
int canonical_flush (ACE_Message_Block *);
};
/**
* @class ACE_Stream_Tail
*
* @brief Standard module that acts as the head of a stream.
*/
template <ACE_SYNCH_DECL, class TIME_POLICY = ACE_System_Time_Policy>
class ACE_Stream_Tail : public ACE_Task<ACE_SYNCH_USE, TIME_POLICY>
{
public:
/// Construction
ACE_Stream_Tail ();
/// Destruction
virtual ~ACE_Stream_Tail ();
// = ACE_Task hooks
virtual int open (void *a = 0);
virtual int close (u_long flags = 0);
virtual int put (ACE_Message_Block *msg, ACE_Time_Value * = 0);
virtual int svc ();
// = Dynamic linking hooks
virtual int init (int argc, ACE_TCHAR *argv[]);
virtual int info (ACE_TCHAR **info_string, size_t length) const;
virtual int fini ();
/// Dump the state of an object.
void dump () const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
private:
/// Performs canonical flushing at the ACE_Stream tail.
int control (ACE_Message_Block *);
int canonical_flush (ACE_Message_Block *);
};
/**
* @class ACE_Thru_Task
*
* @brief Standard module that acts as a "no op", simply passing on all
* data to its adjacent neighbor.
*/
template <ACE_SYNCH_DECL, class TIME_POLICY = ACE_System_Time_Policy>
class ACE_Thru_Task : public ACE_Task<ACE_SYNCH_USE, TIME_POLICY>
{
public:
/// Construction
ACE_Thru_Task ();
/// Destruction
virtual ~ACE_Thru_Task ();
// = ACE_Task hooks
virtual int open (void *a = 0);
virtual int close (u_long flags = 0);
virtual int put (ACE_Message_Block *msg, ACE_Time_Value * = 0);
virtual int svc ();
// = Dynamic linking hooks
virtual int init (int argc, ACE_TCHAR *argv[]);
virtual int info (ACE_TCHAR **info_string, size_t length) const;
virtual int fini ();
/// Dump the state of an object.
void dump () const;
/// Declare the dynamic allocation hooks.
ACE_ALLOC_HOOK_DECLARE;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#include "ace/Stream_Modules.cpp"
#include /**/ "ace/post.h"
#endif /* ACE_STREAM_MODULES */
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