/*
* @(#)$Id: codetemplate_xbird.xml 943 2006-09-13 07:03:37Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.engine.remote;
import java.util.concurrent.Semaphore;
import xbird.config.Settings;
import xbird.engine.request.QueryRequest;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
/**
*
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class ThrottedRemoteSequenceProxy extends RunnableRemoteSequenceProxy {
private static final long serialVersionUID = 1525047704177311709L;
public static final int NUM_THROTTLE = Integer.parseInt(Settings.get("xbird.remote.async_producer.throttle", "32"));
private final Semaphore _throttle;
public ThrottedRemoteSequenceProxy(Semaphore throttle, Sequence<Item> delegate, QueryRequest request) {
super(delegate, request);
this._throttle = throttle;
}
public ThrottedRemoteSequenceProxy(Sequence<Item> delegate) {
super(delegate);
this._throttle = new Semaphore(NUM_THROTTLE);
}
@Override
public void run() {
final Semaphore throttle = _throttle;
throttle.acquireUninterruptibly();
try {
compute();
} finally {
throttle.release();
}
}
}