?? roller.java
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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.varia;import org.apache.log4j.Logger;import org.apache.log4j.BasicConfigurator;import java.io.IOException;import java.io.DataInputStream;import java.io.DataOutputStream;import java.net.Socket;/** A simple application to send roll over messages to a potentially remote {@link ExternallyRolledFileAppender}. <p>It takes two arguments, the <code>host_name</code> and <code>port_number</code> where the <code>ExternallyRolledFileAppender</code> is listening. @author Ceki Gülcü @since version 0.9.0 */public class Roller { static Logger cat = Logger.getLogger(Roller.class); static String host; static int port; // Static class. Roller() { } /** Send a "RollOver" message to <code>ExternallyRolledFileAppender</code> on <code>host</code> and <code>port</code>. */ 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)) { cat.info("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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