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-<!-- $Id$ -->
-<HTML>
-<HEAD>
- <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
- <META NAME="Author" CONTENT="Bob McWhirter">
- <TITLE>ACE Tutorial 014</TITLE>
-</HEAD>
-<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
-
-<CENTER><B><FONT SIZE=+2>ACE Tutorial 014</FONT></B></CENTER>
-
-<CENTER><B><FONT SIZE=+2>ACE_Stream Tutorial, Of Sorts</FONT></B></CENTER>
-
-<P>
-<HR WIDTH="100%">
-<P>
-As stated in the comments below, the default action of the task at the
- stream tail is to treat any received data as an error. In our
- implementation it will often happen that data gets through to
- the tail. How, then, do we handle this without creating an
- error condition? Simple: Create a custom Task for use as the
- stream tail that doesn't consider it an error to receive data.
-<P>
-Read on...
-<P>
-<HR WIDTH="100%">
-<PRE>
-<font color=red>// $Id$</font>
-
-<font color=red>// EndTask.h</font>
-<font color=red>//</font>
-<font color=red>// Tutorial regarding a way to use ACE_Stream.</font>
-<font color=red>//</font>
-<font color=red>// written by bob mcwhirter (bob@netwrench.com)</font>
-<font color=red>//</font>
-<font color=red>//</font>
-
-<font color=blue>#ifndef</font> <font color=purple>ENDTASK_H</font>
-<font color=blue>#define</font> <font color=purple>ENDTASK_H</font>
-
-<font color=blue>#include</font> "<font color=green>Task.h</font>"
-
-<font color=red>// When you setup a Stream and push your modules on,</font>
-<font color=red>// there are two additional modules that go unseen</font>
-<font color=red>// by the user.</font>
-<font color=red>//</font>
-<font color=red>// The Stream pushes on a Stream_Head in front of</font>
-<font color=red>// your first module, and a Stream_Tail behind your</font>
-<font color=red>// last module.</font>
-<font color=red>//</font>
-<font color=red>// If your put () a message to the Stream Tail, it</font>
-<font color=red>// assumes you did so in error. This simple EndTask</font>
-<font color=red>// class allows you to push a message to it and just</font>
-<font color=red>// have it safely Go Away.</font>
-<font color=red>//</font>
-<font color=red>// All this Task does is release the Message_Block</font>
-<font color=red>// and return 0. It's a suitable black-hole.</font>
-
-class EndTask : public Task
-{
-public:
- typedef Task inherited;
-
- EndTask (const char *nameOfTask): inherited (nameOfTask, 0)
- {
- <font color=red>// when we get open ()'d, it with 0 threads since there is actually</font>
- <font color=red>// no processing to do.</font>
-
- ACE_DEBUG ((LM_INFO,
- "<font color=green> (%P|%t) Line: %d, File: %s\n</font>",
- __LINE__,
- __FILE__));
- }
-
- virtual int open (void *)
- {
- ACE_DEBUG ((LM_INFO,
- "<font color=green> (%P|%t) Line: %d, File: %s\n</font>",
- __LINE__,
- __FILE__));
- return 0;
- }
-
- virtual int open (void)
- {
- ACE_DEBUG ((LM_INFO,
- "<font color=green> (%P|%t) Line: %d, File: %s\n</font>",
- __LINE__,
- __FILE__));
- return 0;
- }
-
- virtual ~EndTask (void)
- {
- }
-
- virtual int put (ACE_Message_Block *message,
- ACE_Time_Value *timeout)
- {
- ACE_DEBUG ((LM_INFO,
- "<font color=green> (%P|%t) Line: %d, File: %s\n</font>",
- __LINE__,
- __FILE__));
- ACE_UNUSED_ARG (timeout);
-
- <font color=red>// we don't have anything to do, so release () the message.</font>
- ACE_DEBUG ((LM_DEBUG,
- "<font color=green> (%P|%t) %s <font
-color=#008888>EndTask::put</font> () -- releasing Message_Block\n</font>",
- this->nameOfTask ()));
- message->release ();
- return 0;
- }
-
-};
-
-<font color=blue>#endif</font> <font color=red>/* ENDTASK_H */</font>
-</PRE>
-<P><HR WIDTH="100%">
-<CENTER>[<A HREF="../online-tutorials.html">Tutorial Index</A>] [<A HREF="page05.html">Continue This Tutorial</A>]</CENTER>
-