/*
 * 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.log4j.net;

import java.net.ServerSocket;
import java.net.Socket;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import org.apache.log4j.xml.DOMConfigurator;

/**
 * A simple {@link SocketNode} based server.
 *
 * <pre>
 * <b>Usage:</b> java org.apache.log4j.net.SimpleSocketServer port configFile
 *
 * where <em>port</em> is a part number where the server listens and
 * <em>configFile</em> is a configuration file fed to the {@link
 * PropertyConfigurator} or to {@link DOMConfigurator} if an XML file.
 * </pre>
 *
 * @author Ceki G&uuml;lc&uuml;
 * @since 0.8.4
 */
public class SimpleSocketServer {

    static Logger cat = Logger.getLogger(SimpleSocketServer.class);

    static int port;

    public static void main(String argv[]) {
        if (argv.length == 2) {
            init(argv[0], argv[1]);
        } else {
            usage("Wrong number of arguments.");
        }

        try {
            cat.info("Listening on port " + port);
            ServerSocket serverSocket = new ServerSocket(port);
            while (true) {
                cat.info("Waiting to accept a new client.");
                Socket socket = serverSocket.accept();
                cat.info("Connected to client at " + socket.getInetAddress());
                cat.info("Starting new socket node.");
                new Thread(new SocketNode(socket, LogManager.getLoggerRepository()),
                        "SimpleSocketServer-" + port).start();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    static void usage(String msg) {
        System.err.println(msg);
        System.err.println("Usage: java " + SimpleSocketServer.class.getName() + " port configFile");
        System.exit(1);
    }

    static void init(String portStr, String configFile) {
        try {
            port = Integer.parseInt(portStr);
        } catch (java.lang.NumberFormatException e) {
            e.printStackTrace();
            usage("Could not interpret port number [" + portStr + "].");
        }

        if (configFile.endsWith(".xml")) {
            DOMConfigurator.configure(configFile);
        } else {
            PropertyConfigurator.configure(configFile);
        }
    }
}
