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/*
 * 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.
 *
 *  Usage: java org.apache.log4j.net.SimpleSocketServer port configFile

 where port is a part number where the server listens and
 configFile is a configuration file fed to the {@link
 PropertyConfigurator} or to {@link DOMConfigurator} if an XML file.
 * 
 *
 * @author Ceki Gülcü
 *
 * @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);
	}
    }
}