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//
// ========================================================================
// Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.server;
import java.io.IOException;
import java.io.InterruptedIOException;
import org.eclipse.jetty.util.ArrayQueue;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
/**
* {@link QueuedHttpInput} holds a queue of items passed to it by calls to {@link #content(Object)}.
* <p/>
* {@link QueuedHttpInput} stores the items directly; if the items contain byte buffers, it does not copy them
* but simply holds references to the item, thus the caller must organize for those buffers to valid while
* held by this class.
* <p/>
* To assist the caller, subclasses may override methods {@link #onAsyncRead()}, {@link #onContentConsumed(Object)}
* that can be implemented so that the caller will know when buffers are queued and consumed.
*/
public abstract class QueuedHttpInput<T> extends HttpInput<T>
{
private final static Logger LOG = Log.getLogger(QueuedHttpInput.class);
private final ArrayQueue<T> _inputQ = new ArrayQueue<>(lock());
public QueuedHttpInput()
{
}
public void content(T item)
{
// The buffer is not copied here. This relies on the caller not recycling the buffer
// until the it is consumed. The onContentConsumed and onAllContentConsumed() callbacks are
// the signals to the caller that the buffers can be recycled.
synchronized (lock())
{
boolean wasEmpty = _inputQ.isEmpty();
_inputQ.add(item);
if (LOG.isDebugEnabled())
LOG.debug("{} queued {}", this, item);
if (wasEmpty)
{
if (!onAsyncRead())
lock().notify();
}
}
}
public void recycle()
{
synchronized (lock())
{
T item = _inputQ.pollUnsafe();
while (item != null)
{
onContentConsumed(item);
item = _inputQ.pollUnsafe();
}
super.recycle();
}
}
@Override
protected T nextContent()
{
synchronized (lock())
{
// Items are removed only when they are fully consumed.
T item = _inputQ.peekUnsafe();
// Skip consumed items at the head of the queue.
while (item != null && remaining(item) == 0)
{
_inputQ.pollUnsafe();
onContentConsumed(item);
if (LOG.isDebugEnabled())
LOG.debug("{} consumed {}", this, item);
item = _inputQ.peekUnsafe();
}
return item;
}
}
protected void blockForContent() throws IOException
{
synchronized (lock())
{
while (_inputQ.isEmpty() && !isFinished() && !isEOF())
{
try
{
if (LOG.isDebugEnabled())
LOG.debug("{} waiting for content", this);
lock().wait();
}
catch (InterruptedException e)
{
throw (IOException)new InterruptedIOException().initCause(e);
}
}
}
}
/**
* Callback that signals that the given content has been consumed.
*
* @param item the consumed content
*/
protected abstract void onContentConsumed(T item);
public void earlyEOF()
{
synchronized (lock())
{
super.earlyEOF();
lock().notify();
}
}
public void messageComplete()
{
synchronized (lock())
{
super.messageComplete();
lock().notify();
}
}
}
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