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/*************************************************
*
* = PACKAGE
* JACE.ASX
*
* = FILENAME
* StreamHead.java
*
*@author Prashant Jain
*
*************************************************/
package JACE.ASX;
import JACE.OS.*;
/**
* <hr>
* <h2>SYNOPSIS</h2>
*<blockquote>
* Standard module that acts as the head of a ustream.
*</blockquote>
*/
public class StreamHead extends Task
{
// Module that acts as the head of a Stream.
public int open (Object obj)
{
return 0;
}
public int close (long l)
{
return 0;
}
public int svc ()
{
return -1;
}
private int control (MessageBlock mb)
{
IOCntlMsg ioc = (IOCntlMsg) mb.obj ();
int cmd = ioc.cmd ();
switch (cmd)
{
case IOCntlCmds.SET_LWM:
case IOCntlCmds.SET_HWM:
this.waterMarks (cmd, mb.cont ().length ());
ioc.rval (0);
break;
default:
return 0;
}
return ioc.rval ();
}
/* Performs canonical flushing at the ACE_Stream Head */
private int canonicalFlush (MessageBlock mb)
{
String s = mb.base ();
long f = (new Long (s)).longValue ();
if ((f & TaskFlags.ACE_FLUSHR) != 0)
{
this.flush (TaskFlags.ACE_FLUSHALL);
f &= ~TaskFlags.ACE_FLUSHR;
}
if ((f & TaskFlags.ACE_FLUSHW) != 0)
return this.reply (mb, new TimeValue ());
return 0;
}
public int put (MessageBlock mb, TimeValue tv)
{
int res = 0;
if (mb.msgType () == MessageType.MB_IOCTL
&& (res = this.control (mb)) == -1)
return res;
if (this.isWriter ())
{
return this.putNext (mb, tv);
}
else /* this.isReader () */
{
switch (mb.msgType ())
{
case MessageType.MB_FLUSH:
return this.canonicalFlush (mb);
default:
break;
}
try
{
return this.putq (mb, tv);
}
catch (InterruptedException e)
{
return -1;
}
}
}
public void dump ()
{
}
public int handleTimeout (TimeValue tv, Object obj)
{
return 0;
}
}
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