org.apache.log4j.varia.Roller Maven / Gradle / Ivy
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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}.
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 Logger cat = Logger.getLogger(Roller.class);
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)) {
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);
}
}