/**
 * 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.activemq.transport.tcp;

import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import javax.net.SocketFactory;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 *
 * Automatically generated socket.close() calls to simulate network faults
 */
public class SocketTstFactory extends SocketFactory {
    private static final Logger LOG = LoggerFactory.getLogger(SocketTstFactory.class);

    private static final ConcurrentMap<InetAddress, Integer> closeIter = new ConcurrentHashMap<InetAddress, Integer>();

    private class SocketTst {

        private class Bagot implements Runnable {
            private final Thread processus;
            private final Socket socket;
            private final InetAddress address;

            public Bagot(Random rnd, Socket socket, InetAddress address) {
                this.processus = new Thread(this, "Network Faults maker : undefined");
                this.socket = socket;
                this.address = address;
            }

            public void start() {
                this.processus.setName("Network Faults maker : " + this.socket.toString());
                this.processus.start();
            }

            @Override
            public void run() {
                int lastDelayVal;
                Integer lastDelay;
                while (!this.processus.isInterrupted()) {
                    if (!this.socket.isClosed()) {
                        try {
                            lastDelay = closeIter.get(this.address);
                            if (lastDelay == null) {
                                lastDelayVal = 0;
                            } else {
                                lastDelayVal = lastDelay;
                                if (lastDelayVal > 10)
                                    lastDelayVal += 20;
                                else
                                    lastDelayVal += 1;
                            }

                            lastDelay = lastDelayVal;

                            LOG.info("Trying to close client socket " + socket.toString() + " in " + lastDelayVal + " milliseconds");

                            try {
                                Thread.sleep(lastDelayVal);
                            } catch (InterruptedException e) {
                                this.processus.interrupt();
                                Thread.currentThread().interrupt();
                            } catch (IllegalArgumentException e) {
                            }

                            this.socket.close();
                            closeIter.put(this.address, lastDelay);
                            LOG.info("Client socket " + this.socket.toString() + " is closed.");
                        } catch (IOException e) {
                        }
                    }

                    this.processus.interrupt();
                }
            }
        }

        private final Bagot bagot;
        private final Socket socket;

        public SocketTst(InetAddress address, int port, Random rnd) throws IOException {
            this.socket = new Socket(address, port);
            bagot = new Bagot(rnd, this.socket, address);
        }

        public SocketTst(InetAddress address, int port, InetAddress localAddr, int localPort, Random rnd) throws IOException {
            this.socket = new Socket(address, port, localAddr, localPort);
            bagot = new Bagot(rnd, this.socket, address);
        }

        public SocketTst(String address, int port, Random rnd) throws UnknownHostException, IOException {
            this.socket = new Socket(address, port);
            bagot = new Bagot(rnd, this.socket, InetAddress.getByName(address));
        }

        public SocketTst(String address, int port, InetAddress localAddr, int localPort, Random rnd) throws IOException {
            this.socket = new Socket(address, port, localAddr, localPort);
            bagot = new Bagot(rnd, this.socket, InetAddress.getByName(address));
        }

        public Socket getSocket() {
            return this.socket;
        }

        public void startBagot() {
            bagot.start();
        }
    };

    private final Random rnd;

    public SocketTstFactory() {
        super();
        LOG.info("Creating a new SocketTstFactory");
        this.rnd = new Random();
    }

    @Override
    public Socket createSocket(InetAddress host, int port) throws IOException {
        SocketTst sockTst;
        sockTst = new SocketTst(host, port, this.rnd);
        sockTst.startBagot();
        return sockTst.getSocket();
    }

    @Override
    public Socket createSocket(InetAddress host, int port, InetAddress localAddress, int localPort) throws IOException {
        SocketTst sockTst;
        sockTst = new SocketTst(host, port, localAddress, localPort, this.rnd);
        sockTst.startBagot();
        return sockTst.getSocket();
    }

    @Override
    public Socket createSocket(String host, int port) throws IOException {
        SocketTst sockTst;
        sockTst = new SocketTst(host, port, this.rnd);
        sockTst.startBagot();
        return sockTst.getSocket();
    }

    @Override
    public Socket createSocket(String host, int port, InetAddress localAddress, int localPort) throws IOException {
        SocketTst sockTst;
        sockTst = new SocketTst(host, port, localAddress, localPort, this.rnd);
        sockTst.startBagot();
        return sockTst.getSocket();
    }

    private final static SocketTstFactory client = new SocketTstFactory();

    public static SocketFactory getDefault() {
        return client;
    }
}
