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Tomcat example source code file (LeaderFollowerWorkerThread.java)

This example Tomcat source code file (LeaderFollowerWorkerThread.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

interruptedexception, interruptedexception, leaderfollowerworkerthread, leaderfollowerworkerthread, net, network, object, object, pooltcpendpoint, socket, tcpconnection, tcpconnection, threadpoolrunnable

The Tomcat LeaderFollowerWorkerThread.java source code

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF 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 org.apache.tomcat.util.net;

import java.net.Socket;
import org.apache.tomcat.util.threads.ThreadPoolRunnable;

/*
 * I switched the threading model here.
 *
 * We used to have a "listener" thread and a "connection"
 * thread, this results in code simplicity but also a needless
 * thread switch.
 *
 * Instead I am now using a pool of threads, all the threads are
 * simmetric in their execution and no thread switch is needed.
 */
class LeaderFollowerWorkerThread implements ThreadPoolRunnable {
    /* This is not a normal Runnable - it gets attached to an existing
       thread, runs and when run() ends - the thread keeps running.

       It's better to keep the name ThreadPoolRunnable - avoid confusion.
       We also want to use per/thread data and avoid sync wherever possible.
    */
    PoolTcpEndpoint endpoint;
    
    public LeaderFollowerWorkerThread(PoolTcpEndpoint endpoint) {
        this.endpoint = endpoint;
    }

    public Object[] getInitData() {
        // no synchronization overhead, but 2 array access 
        Object obj[]=new Object[2];
        obj[1]= endpoint.getConnectionHandler().init();
        obj[0]=new TcpConnection();
        return obj;
    }
    
    public void runIt(Object perThrData[]) {

        // Create per-thread cache
        if (endpoint.isRunning()) {

            // Loop if endpoint is paused
            while (endpoint.isPaused()) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    // Ignore
                }
            }

            // Accept a new connection
            Socket s = null;
            try {
                s = endpoint.acceptSocket();
            } finally {
                // Continue accepting on another thread...
                if (endpoint.isRunning()) {
                    endpoint.tp.runIt(this);
                }
            }

            // Process the connection
            if (null != s) {
                endpoint.processSocket(s, (TcpConnection) perThrData[0], (Object[]) perThrData[1]);
            }

        }
    }
    
}

Other Tomcat examples (source code examples)

Here is a short list of links related to this Tomcat LeaderFollowerWorkerThread.java source code file:

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