Logback: the reliable, generic, fast and flexible logging framework.
Copyright (C) 1999-2015, QOS.ch. All rights reserved.
This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation
  or (per the licensee's choosing)
under the terms of the GNU Lesser General Public License version 2.1
as published by the Free Software Foundation.
/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.net;

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

import javax.net.SocketFactory;

import ch.qos.logback.core.util.DelayStrategy;
import ch.qos.logback.core.util.FixedDelay;

Default implementation of SocketConnector. 
Author:
Carl Harris
Since:
1.0.12/**
 * Default implementation of {@link SocketConnector}.
 *
 * @author Carl Harris
 * @since 1.0.12
 */
public class DefaultSocketConnector implements SocketConnector {

    private final InetAddress address;
    private final int port;
    private final DelayStrategy delayStrategy;

    private ExceptionHandler exceptionHandler;
    private SocketFactory socketFactory;

    
Constructs a new connector.
Params:
address –      address of remote listener
port –         port of remote listener
initialDelay – delay before initial connection attempt
retryDelay –   delay after failed connection attempt/**
     * Constructs a new connector.
     *
     * @param address      address of remote listener
     * @param port         port of remote listener
     * @param initialDelay delay before initial connection attempt
     * @param retryDelay   delay after failed connection attempt
     */
    public DefaultSocketConnector(InetAddress address, int port, long initialDelay, long retryDelay) {
        this(address, port, new FixedDelay(initialDelay, retryDelay));
    }

    
Constructs a new connector.
Params:
address –       address of remote listener
port –          port of remote listener
delayStrategy – strategy for choosing the delay to impose before
                     each connection attempt/**
     * Constructs a new connector.
     *
     * @param address       address of remote listener
     * @param port          port of remote listener
     * @param delayStrategy strategy for choosing the delay to impose before
     *                      each connection attempt
     */
    public DefaultSocketConnector(InetAddress address, int port, DelayStrategy delayStrategy) {
        this.address = address;
        this.port = port;
        this.delayStrategy = delayStrategy;
    }

    
Loops until the desired connection is established and returns the resulting connector.
/**
     * Loops until the desired connection is established and returns the resulting connector.
     */
    public Socket call() throws InterruptedException {
        useDefaultsForMissingFields();
        Socket socket = createSocket();
        while (socket == null && !Thread.currentThread().isInterrupted()) {
            Thread.sleep(delayStrategy.nextDelay());
            socket = createSocket();
        }
        return socket;
    }

    private Socket createSocket() {
        Socket newSocket = null;
        try {
            newSocket = socketFactory.createSocket(address, port);
        } catch (IOException ioex) {
            exceptionHandler.connectionFailed(this, ioex);
        }
        return newSocket;
    }

    private void useDefaultsForMissingFields() {
        if (exceptionHandler == null) {
            exceptionHandler = new ConsoleExceptionHandler();
        }
        if (socketFactory == null) {
            socketFactory = SocketFactory.getDefault();
        }
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    public void setExceptionHandler(ExceptionHandler exceptionHandler) {
        this.exceptionHandler = exceptionHandler;
    }

    
{@inheritDoc}
/**
     * {@inheritDoc}
     */
    public void setSocketFactory(SocketFactory socketFactory) {
        this.socketFactory = socketFactory;
    }

    
A default ExceptionHandler that writes to System.out /**
     * A default {@link ExceptionHandler} that writes to {@code System.out}
     */
    private static class ConsoleExceptionHandler implements ExceptionHandler {

        public void connectionFailed(SocketConnector connector, Exception ex) {
            System.out.println(ex);
        }

    }

}