OFStatisticsFuture.java

/*
 * Copyright (c) 2011,2013 Big Switch Networks, Inc.
 *
 * Licensed under the Eclipse Public License, Version 1.0 (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.eclipse.org/legal/epl-v10.html
 *
 * 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.
 *
 * This file incorporates work covered by the following copyright and
 * permission notice:
 *
 *    Originally created by David Erickson, Stanford University 
 *
 *    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. 
 */

package org.sdnplatform.core.internal;

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.TimeUnit;


import org.openflow.protocol.OFMessage;
import org.openflow.protocol.OFStatisticsReply;
import org.openflow.protocol.OFType;
import org.openflow.protocol.statistics.OFStatistics;
import org.sdnplatform.core.IOFSwitch;
import org.sdnplatform.threadpool.IThreadPoolService;

/**
 * A concrete implementation that handles asynchronously receiving OFStatistics
 * 
 * @author David Erickson (daviderickson@cs.stanford.edu)
 */
public class OFStatisticsFuture extends
        OFMessageFuture<List<OFStatistics>> {

    protected volatile boolean finished;

    public OFStatisticsFuture(IThreadPoolService tp,
            IOFSwitch sw, int transactionId) {
        super(tp, sw, OFType.STATS_REPLY, transactionId);
        init();
    }

    public OFStatisticsFuture(IThreadPoolService tp,
            IOFSwitch sw, int transactionId, long timeout, TimeUnit unit) {
        super(tp, sw, OFType.STATS_REPLY, transactionId, timeout, unit);
        init();
    }

    private void init() {
        this.finished = false;
        this.result = new CopyOnWriteArrayList<OFStatistics>();
    }

    @Override
    protected void handleReply(IOFSwitch sw, OFMessage msg) {
        OFStatisticsReply sr = (OFStatisticsReply) msg;
        synchronized (this.result) {
            this.result.addAll(sr.getStatistics());
            if ((sr.getFlags() & 0x1) == 0) {
                this.finished = true;
            }
        }
    }

    @Override
    protected boolean isFinished() {
        return finished;
    }
    
    @Override
    protected void unRegister() {
        super.unRegister();
        sw.cancelStatisticsReply(transactionId);
    }
}