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-<HTML>
-<HEAD>
-   <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
-   <META NAME="Author" CONTENT="James CE Johnson">
-   <TITLE>ACE Tutorial 015</TITLE>
-</HEAD>
-<BODY TEXT="#000000" BGCOLOR="#FFFFFF" LINK="#000FFF" VLINK="#FF0F0F">
-
-<CENTER><B><FONT SIZE=+2>ACE Tutorial 015</FONT></B></CENTER>
-
-<CENTER><B><FONT SIZE=+2>Building a protocol stream</FONT></B></CENTER>
-
-<P>
-<HR WIDTH="100%">
-The Recv implementation is nearly as simple as Xmit.  There's
-opportunity for error when we get the message size and we have to
-manage the lifetime of the tickler but other than that it's pretty
-basic stuff.
-<HR>
-<PRE>
-
-<font color=red>// $Id$</font>
-
-<font color=blue>#include</font> "<font color=green>Recv.h</font>"
-<font color=blue>#include</font> "<A HREF="../../../ace/SOCK_Stream.h">ace/SOCK_Stream.h</A>"
-
-<font color=red>/* Construct the object with the peer reference and other appropriate
-   initializations.
-*/</font>
-<font color=#008888>Recv::Recv</font>( ACE_SOCK_Stream & _peer )
-        : Protocol_Task(), peer_(_peer), error_(0)
-{
-     <font color=red>// Create the tickler that get() will use to trigger recv()</font>
-     <font color=red>// through the baseclass.  Since we're single-threaded this is</font>
-     <font color=red>// probably overkill but it makes multi-threading easier if we</font>
-     <font color=red>// choose to do that.</font>
-    tickler_ = new ACE_Message_Block(1);
-}
-
-<font color=red>/* Be sure we manage the lifetime of the tickler to prevent a memory
-   leak.
-*/</font>
-<font color=#008888>Recv::~Recv</font>(void)
-{
-    tickler_->release();
-}
-
-<font color=red>/* By putting the tickler to ourselves we cause things to happen in
-   the baseclass that will invoke recv().  If we know we're single
-   threaded we could directly call recv() and be done with it but then 
-   we'd have to do something else if we're multi-threaded.  Just let
-   the baseclass worry about those things!
-*/</font>
-int <font color=#008888>Recv::get</font>(void)
-{
-    return this->put( tickler_, 0 );
-}
-
-int <font color=#008888>Recv::recv</font>(ACE_Message_Block * message, ACE_Time_Value *timeout)
-{
-    int rval;
-
-        <font color=red>/* Xmit will send us the message length in clear-text.  I
-           assume that will be less than 32-bytes!
-        */</font>
-    char msize[32];
-    int b = 0;
-
-        <font color=red>/* Read from the socket one byte at a time until we see then
-           end-of-string NULL character.  Since the OS layers (at least
-           in Unix) will provide some buffering this isn't as bad as
-           it may seem at first.
-
-           The byte-at-a-time recv breaks horribly on Win32 where the
-           WFMO_Reactor is used.  This is because the socket has been
-           placed into non-blocking mode and only the recv() of the
-           first byte will block.  The solution is to use
-           ACE_Select_Reactor which doesn't change the socket
-           characteristics.  We did that back in main(), so we should
-           be in good shape now.
-        */</font>
-    do
-    {
-        rval = this->peer().recv( &msize[b], 1, timeout );
-        if( rval == -1 )
-        {
-            error_ = 1;
-            ACE_ERROR_RETURN ((LM_ERROR, "<font color=green>%p\n</font>", "<font color=green><font color=#008888>Recv::recv</font>() Failed to get message size.</font>"), -1);
-        }
-    }
-    while( msize[b++] != 0 );
-
-    int size = <font color=#008888>ACE_OS::atoi</font>(msize);
-
-        <font color=red>// Make a block big enough to contain the data we'll read</font>
-    message = new ACE_Message_Block( size );
-
-        <font color=red>// Read the actual message data into our new message block</font>
-    rval = this->peer().recv_n( message->wr_ptr(), size, 0, timeout );
-
-        <font color=red>// If we got the data correctly then send it on upstream.</font>
-    if( rval > 0 )
-    {
-        message->wr_ptr( rval );
-        return( this->put_next( message ) );
-    }
-
-        <font color=red>// Something bad happend on the recv_n().  Set an error flag</font>
-        <font color=red>// and return error.</font>
-    error_ = 1;
-    
-    return( -1 );
-}
-</PRE>
-<P><HR WIDTH="100%">
-<CENTER>[<A HREF="../online-tutorials.html">Tutorial Index</A>] [<A HREF="page18.html">Continue This Tutorial</A>]</CENTER>