gash.router.server.queue.GlobalCommandOutboundAppWorker.java Source code

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Here is the source code for gash.router.server.queue.GlobalCommandOutboundAppWorker.java

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/*
 * copyright 2015, 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 gash.router.server.queue;

import com.google.protobuf.GeneratedMessage;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class GlobalCommandOutboundAppWorker extends Thread {
    protected static Logger logger = LoggerFactory.getLogger("gcoaw:server");

    int workerId;
    PerChannelGlobalCommandQueue sq;
    boolean forever = true;

    public GlobalCommandOutboundAppWorker(ThreadGroup tgrp, int workerId, PerChannelGlobalCommandQueue sq) {
        super(tgrp, "outboundWork-" + workerId);
        this.workerId = workerId;
        this.sq = sq;

        if (sq.outboundWork == null)
            throw new RuntimeException("connection worker detected no outboundWork queue");
    }

    @Override
    public void run() {
        Channel conn = sq.channel;
        if (conn == null || !conn.isOpen()) {
            PerChannelGlobalCommandQueue.logger.error("connection missing, no outboundWork communication");
            return;
        }

        while (true) {
            if (!forever && sq.outboundWork.size() == 0)
                break;

            try {
                // block until a message is enqueued
                GeneratedMessage msg = sq.outboundWork.take();
                if (conn.isWritable()) {
                    boolean rtn = false;
                    if (sq.channel != null && sq.channel.isOpen() && sq.channel.isWritable()) {

                        ChannelFuture cf = sq.channel.writeAndFlush(msg);

                        logger.info("Server--sending -- command -- response");
                        // blocks on write - use listener to be async
                        cf.awaitUninterruptibly();
                        logger.debug("Written to channel");
                        rtn = cf.isSuccess();
                        if (!rtn) {
                            System.out.println("Sending failed " + rtn + "{Reason:" + cf.cause() + "}");
                            sq.outboundWork.putFirst(msg);
                        } else
                            logger.info("Message Sent");
                    }

                } else
                    sq.outboundWork.putFirst(msg);
            } catch (InterruptedException ie) {
                break;
            } catch (Exception e) {
                logger.error("Unexpected communcation failure", e);
                break;
            }
        }

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