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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Stream.h
//
// = AUTHOR
// Doug Schmidt
//
// ============================================================================
#ifndef ACE_STREAM_H
#define ACE_STREAM_H
#include "ace/ACE.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/IO_Cntl_Msg.h"
#include "ace/Message_Block.h"
#include "ace/Time_Value.h"
#include "ace/Module.h"
// Forward decls.
template<ACE_SYNCH_DECL> class ACE_Stream_Iterator;
template <ACE_SYNCH_DECL>
class ACE_Stream
{
// = TITLE
// This class is the primary abstraction for the ASX framework.
// It is moduled after System V Stream.
//
// = DESCRIPTION
// A Stream consists of a stack of <ACE_Modules>, each of which
// contains two <ACE_Tasks>. Even though the methods in this
// class are virtual, this class isn't really intended for
// subclassing unless you know what you are doing. In
// particular, the <ACE_Stream> destructor calls <close>, which
// won't be overridden properly unless you call it in a subclass
// destructor.
public:
friend class ACE_Stream_Iterator<ACE_SYNCH_USE>;
enum
{
M_DELETE = 3
// Indicates that <close> deletes the Tasks. Don't change this
// value without updating the same enum in class ACE_Module...
};
// = Initializatation and termination methods.
ACE_Stream (void *arg = 0,
ACE_Module<ACE_SYNCH_USE> *head = 0,
ACE_Module<ACE_SYNCH_USE> *tail = 0);
// Create a Stream consisting of <head> and <tail> as the Stream
// head and Stream tail, respectively. If these are 0 then the
// <ACE_Stream_Head> and <ACE_Stream_Tail> are used, respectively.
// <arg> is the value past in to the open() methods of the tasks.
virtual int open (void *arg,
ACE_Module<ACE_SYNCH_USE> *head = 0,
ACE_Module<ACE_SYNCH_USE> *tail = 0);
// Create a Stream consisting of <head> and <tail> as the Stream
// head and Stream tail, respectively. If these are 0 then the
// <ACE_Stream_Head> and <ACE_Stream_Tail> are used, respectively.
// <arg> is the value past in to the open() methods of the tasks.
virtual int close (int flags = M_DELETE);
// Close down the stream and release all the resources.
virtual ~ACE_Stream (void);
// Close down the stream and release all the resources.
// = ACE_Stream plumbing operations
virtual int push (ACE_Module<ACE_SYNCH_USE> *mod);
// Add a new module <mod> right below the Stream head.
virtual int pop (int flags = M_DELETE);
// Remove the <mod> right below the Stream head and close it down.
virtual int top (ACE_Module<ACE_SYNCH_USE> *&mod);
// Return the top module on the stream (right below the stream
// head).
virtual int remove (const ASYS_TCHAR *mod,
int flags = M_DELETE);
// Remove the named module <mod> from the stream. This bypasses the
// strict LIFO ordering of push() and pop().
virtual ACE_Module<ACE_SYNCH_USE> *head (void);
// Return current stream head.
virtual ACE_Module<ACE_SYNCH_USE> *tail (void);
// Return current stream tail.
virtual ACE_Module<ACE_SYNCH_USE> *find (const ASYS_TCHAR *mod);
// Find a particular ACE_Module.
virtual int link (ACE_Stream<ACE_SYNCH_USE> &);
// Create a pipe between two Streams.
virtual int unlink (void);
// Remove a pipe formed between two Streams.
// = Blocking data transfer operations
virtual int put (ACE_Message_Block *mb,
ACE_Time_Value *timeout = 0);
// Send the message <mb> down the stream, starting at the Module
// below the Stream head. Wait for upto <timeout> amount of time
// for the operation to complete (or block forever if <timeout> ==
// 0).
virtual int get (ACE_Message_Block *&mb,
ACE_Time_Value *timeout = 0);
// Read the message <mb> that is stored in the the stream head.
// Wait for upto <timeout> amount of time for the operation to
// complete (or block forever if <timeout> == 0).
virtual int control (ACE_IO_Cntl_Msg::ACE_IO_Cntl_Cmds cmd,
void *args);
// Send control message down the stream.
virtual int wait (void);
// Synchronize with the final close of the stream.
virtual void dump (void) const;
// Dump the state of an object.
ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
private:
int unlink_i (void);
// Actually perform the unlinking of two Streams (must be called
// with locks held).
int link_i (ACE_Stream<ACE_SYNCH_USE> &);
// Actually perform the linking of two Streams (must be called with
// locks held).
int push_module (ACE_Module<ACE_SYNCH_USE> *,
ACE_Module<ACE_SYNCH_USE> * = 0,
ACE_Module<ACE_SYNCH_USE> * = 0);
// Must a new module onto the Stream.
ACE_Module<ACE_SYNCH_USE> *stream_head_;
// Pointer to the head of the stream.
ACE_Module<ACE_SYNCH_USE> *stream_tail_;
// Pointer to the tail of the stream.
ACE_Stream<ACE_SYNCH_USE> *linked_us_;
// Pointer to an adjoining linked stream.
// = Synchronization objects used for thread-safe streams.
ACE_SYNCH_MUTEX_T lock_;
// Protect the stream against race conditions.
ACE_SYNCH_CONDITION_T final_close_;
// Use to tell all threads waiting on the close that we are done.
};
template <ACE_SYNCH_DECL>
class ACE_Stream_Iterator
{
// = TITLE
// Iterate through an <ACE_Stream>.
public:
// = Initialization method.
ACE_Stream_Iterator (const ACE_Stream<ACE_SYNCH_USE> &sr);
// = Iteration methods.
int next (const ACE_Module<ACE_SYNCH_USE> *&next_item);
// Pass back the <next_item> that hasn't been seen in the set.
// Returns 0 when all items have been seen, else 1.
int done (void) const;
// Returns 1 when all items have been seen, else 0.
int advance (void);
// Move forward by one element in the set. Returns 0 when all the
// items in the set have been seen, else 1.
private:
ACE_Module<ACE_SYNCH_USE> *next_;
// Next <Module> that we haven't yet seen.
};
#if defined (__ACE_INLINE__)
#include "ace/Stream.i"
#endif /* __ACE_INLINE__ */
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Stream.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Stream.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#endif /* ACE_STREAM_H */
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