ServerRunner.java

/*
 *  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 org.example.tcpserver;

import org.apache.log4j.Logger;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.env.CommandLinePropertySource;
import org.springframework.core.env.SimpleCommandLinePropertySource;
import org.springframework.context.support.AbstractApplicationContext;

/**
 * Defines a tcp server.
 */
public class ServerRunner {
    /* Local logger. */
    private static final Logger LOG = Logger.getLogger(ServerRunner.class);
    /* Command line parameter holder. */

    /**
     * Famous main function of the tcp server.
     *
     * @param args to be parsed.
     */
    public static void main(String[] args) {
        @SuppressWarnings("rawtypes")
		CommandLinePropertySource clps = processProperties(args);
        /* Spring Integration context used to get desirable beans. */
        AbstractApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"server-config.xml"}, false);
        context.getEnvironment().getPropertySources().addFirst(clps);
        context.refresh();
        context.registerShutdownHook();
    }


    @SuppressWarnings("rawtypes")
	private static CommandLinePropertySource processProperties(String[] args) throws IllegalArgumentException {
        CommandLinePropertySource result = new SimpleCommandLinePropertySource(args);
        /* Parses the command line arguments. */
        if(result.containsProperty("file")) {
            LOG.info("File to be sent=" + result.getProperty("file"));
        } else {
            LOG.warn("Please provide --file=<filename>");
            throw new IllegalArgumentException("Please provide --file");
        }
        if(result.containsProperty("port")) {
            LOG.info("Listening to port="+result.getProperty("port"));
        } else {
            LOG.warn("Listening to default port");
        }
        return result;
    }
}