+/*
+ * 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);
+ }
+}