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What this is

This file is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

 * Copyright (C) The Apache Software Foundation. All rights reserved.
 * This software is published under the terms of the Apache Software License
 * version 1.1, a copy of which has been included  with this distribution in
 * the LICENSE.txt file.

package org.apache.log4j.varia;

import org.apache.log4j.Category;
import org.apache.log4j.BasicConfigurator;


   A simple application to send roll over messages to a potentially
   remote {@link ExternallyRolledFileAppender}. 


It takes two arguments, the host_name and port_number where the ExternallyRolledFileAppender is listening. @author Ceki Gülcü @since version 0.9.0 */ public class Roller { static Category cat = Category.getInstance(Roller.class.getName()); static String host; static int port; // Static class. Roller() { } /** Send a "RollOver" message to ExternallyRolledFileAppender on host and port. */ public static void main(String argv[]) { BasicConfigurator.configure(); if(argv.length == 2) init(argv[0], argv[1]); else usage("Wrong number of arguments."); roll(); } static void usage(String msg) { System.err.println(msg); System.err.println( "Usage: java " + Roller.class.getName() + "host_name port_number"); System.exit(1); } static void init(String hostArg, String portArg) { host = hostArg; try { port = Integer.parseInt(portArg); } catch(java.lang.NumberFormatException e) { usage("Second argument "+portArg+" is not a valid integer."); } } static void roll() { try { Socket socket = new Socket(host, port); DataOutputStream dos = new DataOutputStream(socket.getOutputStream()); DataInputStream dis = new DataInputStream(socket.getInputStream()); dos.writeUTF(ExternallyRolledFileAppender.ROLL_OVER); String rc = dis.readUTF(); if(ExternallyRolledFileAppender.OK.equals(rc)) {"Roll over signal acknowledged by remote appender."); } else { cat.warn("Unexpected return code "+rc+" from remote entity."); System.exit(2); } } catch(IOException e) { cat.error("Could not send roll signal on host "+host+" port "+port+" .", e); System.exit(2); } System.exit(0); } }

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