de.xwic.appkit.core.cluster.impl.InboundConnectionHandler.java Source code

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Here is the source code for de.xwic.appkit.core.cluster.impl.InboundConnectionHandler.java

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/*******************************************************************************
 * Copyright 2015 xWic group (http://www.xwic.de)
 *
 * 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 de.xwic.appkit.core.cluster.impl;

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Listens to the specified port for connections from other nodes. If a node connects, it spins of
 * a separate thread to handle the communication with this client.
 * 
 * @author lippisch
 *
 */
public class InboundConnectionHandler implements Runnable {

    private Log log = LogFactory.getLog(getClass());
    private int port;
    private Cluster cluster;

    /**
     * @param port
     */
    public InboundConnectionHandler(Cluster cluster, int port) {
        super();
        this.cluster = cluster;
        this.port = port;
    }

    /* (non-Javadoc)
     * @see java.lang.Runnable#run()
     */
    @Override
    public void run() {

        ServerSocket srvSocket;
        try {
            srvSocket = new ServerSocket(port);

        } catch (IOException e) {
            log.error("Can not open server socket", e);
            return; // exit
        }

        int conHandlerCount = 0;
        int errCount = 0;
        long lastErr = 0;
        while (true) {
            try {
                Socket socket = srvSocket.accept();

                log.debug("Accepted connection from " + socket.getInetAddress().getHostAddress());

                ClientHandler ch = new ClientHandler(cluster, socket);

                Thread t = new Thread(ch,
                        "ConnectionHandler-" + socket.getInetAddress().getHostAddress() + "-" + conHandlerCount++);
                t.setDaemon(true); // launch as a Deamon
                t.start();

            } catch (IOException e) {
                log.error("Error accepting incoming connection...", e);
                if ((System.currentTimeMillis() - lastErr) < 3000) { // the last error was just 3 seconds ago
                    errCount++;
                    if (errCount > 100) {
                        log.error("More than 100 errors occured within the last 3 seconds. Giving up.");
                        break; // break the loop
                    }
                } else {
                    errCount = 0;
                }
                lastErr = System.currentTimeMillis();
            }
        }

    }

}