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// **********************************************************************
//
// Copyright (c) 2003-2014 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
package IceInternal;
import java.util.concurrent.ExecutorService;
final class ThreadPoolWorkQueue extends EventHandler
{
ThreadPoolWorkQueue(Instance instance, ThreadPool threadPool, Selector selector)
{
_executor = instance.getQueueExecutor();
_threadPool = threadPool;
_selector = selector;
_destroyed = false;
Network.SocketPair pair = Network.createPipe();
_fdIntrRead = (java.nio.channels.ReadableByteChannel)pair.source;
_fdIntrWrite = pair.sink;
try
{
pair.source.configureBlocking(false);
}
catch(java.io.IOException ex)
{
throw new Ice.SyscallException(ex);
}
_selector.initialize(this);
_selector.update(this, SocketOperation.None, SocketOperation.Read);
}
@Override
protected synchronized void
finalize()
throws Throwable
{
try
{
IceUtilInternal.Assert.FinalizerAssert(_destroyed);
}
catch(java.lang.Exception ex)
{
}
finally
{
super.finalize();
}
}
public synchronized void
close()
{
try
{
_fdIntrWrite.close();
}
catch(java.io.IOException ex)
{
}
_fdIntrWrite = null;
try
{
_fdIntrRead.close();
}
catch(java.io.IOException ex)
{
}
_fdIntrRead = null;
}
public synchronized
void destroy()
{
assert(!_destroyed);
_destroyed = true;
postMessage();
}
public synchronized void
queue(ThreadPoolWorkItem item)
{
if(_destroyed)
{
throw new Ice.CommunicatorDestroyedException();
}
assert(item != null);
_workItems.add(item);
postMessage();
}
@Override
public void
message(ThreadPoolCurrent current)
{
java.nio.ByteBuffer buf = java.nio.ByteBuffer.allocate(1);
try
{
buf.rewind();
int ret = _fdIntrRead.read(buf);
assert(ret > 0);
}
catch(java.io.IOException ex)
{
throw new Ice.SocketException(ex);
}
ThreadPoolWorkItem workItem = null;
synchronized(this)
{
if(!_workItems.isEmpty())
{
workItem = _workItems.removeFirst();
assert(workItem != null);
}
else
{
assert(_destroyed);
postMessage();
}
}
if(workItem != null)
{
workItem.execute(current);
}
else
{
_threadPool.ioCompleted(current);
throw new ThreadPool.DestroyedException();
}
}
@Override
public void
finished(ThreadPoolCurrent current)
{
assert(false);
}
@Override
public String
toString()
{
return "work queue";
}
@Override
public java.nio.channels.SelectableChannel
fd()
{
return (java.nio.channels.SelectableChannel)_fdIntrRead;
}
public void
postMessage()
{
if(_executor != null)
{
_executor.submit(new Runnable() {
@Override
public void run()
{
postMessageInternal();
}
});
}
else {
postMessageInternal();
}
}
private void
postMessageInternal()
{
java.nio.ByteBuffer buf = java.nio.ByteBuffer.allocate(1);
buf.put(0, (byte)0);
while(buf.hasRemaining())
{
try
{
_fdIntrWrite.write(buf);
}
//
// This is thrown if the thread is interrupted.
//
catch(java.nio.channels.ClosedChannelException ex)
{
break;
}
catch(java.io.IOException ex)
{
throw new Ice.SocketException(ex);
}
}
}
private final ThreadPool _threadPool;
private final Selector _selector;
boolean _destroyed;
private java.nio.channels.ReadableByteChannel _fdIntrRead;
private java.nio.channels.WritableByteChannel _fdIntrWrite;
private java.util.LinkedList<ThreadPoolWorkItem> _workItems = new java.util.LinkedList<ThreadPoolWorkItem>();
private ExecutorService _executor;
}
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