poke.server.cluster.OutboundClusterWorker.java Source code

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Here is the source code for poke.server.cluster.OutboundClusterWorker.java

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/*
 * copyright 2012, gash
 * 
 * Gash licenses this file to you 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 poke.server.cluster;

import io.netty.channel.ChannelFuture;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import poke.cluster.Image.Request;
import poke.server.cluster.ClusterQueue.ClusterQueueEntry;

public class OutboundClusterWorker extends Thread {
    protected static Logger logger = LoggerFactory.getLogger("cluster");

    int workerId;
    boolean forever = true;

    public OutboundClusterWorker(ThreadGroup tgrp, int workerId) {
        super(tgrp, "outbound-cluster-" + workerId);
        logger.info("OutboundClusterWorker initialized");
        this.workerId = workerId;

        if (ClusterQueue.outbound == null)
            throw new RuntimeException("cluster worker detected null queue");
    }

    @Override
    public void run() {
        while (true) {
            if (!forever && ClusterQueue.outbound.size() == 0)
                break;

            try {
                // block until a message is enqueued
                ClusterQueueEntry msg = ClusterQueue.outbound.take();

                if (logger.isDebugEnabled())
                    logger.debug("Outbound cluster message routing to cluster " + msg.req.getHeader().getClusterId()
                            + " and node" + msg.req.getHeader().getClientId());

                if (msg.channel.isWritable()) {
                    boolean rtn = false;
                    if (msg.channel != null && msg.channel.isOpen() && msg.channel.isWritable()) {
                        ChannelFuture cf = msg.channel.write(msg);

                        // blocks on write - use listener to be async
                        cf.awaitUninterruptibly();
                        rtn = cf.isSuccess();
                        if (!rtn)
                            ClusterQueue.outbound.putFirst(msg);
                    }

                } else {
                    logger.info("channel to cluster " + msg.req.getHeader().getClusterId() + " & node "
                            + msg.req.getHeader().getClientId() + " is not writable");
                    ClusterQueue.outbound.putFirst(msg);
                }
            } catch (InterruptedException ie) {
                break;
            } catch (Exception e) {
                logger.error("Unexpected cluster communcation failure", e);
                break;
            }
        }

        if (!forever) {
            logger.info("cluster outbound queue closing");
        }
    }

}