org.apache.log4j.chainsaw.LoggingReceiver Maven / Gradle / Ivy
/*
* 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.chainsaw;
import java.io.EOFException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import org.apache.log4j.Logger;
import org.apache.log4j.spi.LoggingEvent;
/**
* A daemon thread the processes connections from a
* org.apache.log4j.net.SocketAppender.html.
*
* @author Oliver Burn
*/
class LoggingReceiver extends Thread {
/** used to log messages **/
private static final Logger LOG = Logger.getLogger(LoggingReceiver.class);
/**
* Helper that actually processes a client connection. It receives events
* and adds them to the supplied model.
*
* @author Oliver Burn
*/
private class Slurper implements Runnable {
/** socket connection to read events from **/
private final Socket mClient;
/**
* Creates a new Slurper instance.
*
* @param aClient socket to receive events from
*/
Slurper(Socket aClient) {
mClient = aClient;
}
/** loops getting the events **/
public void run() {
LOG.debug("Starting to get data");
try {
final ObjectInputStream ois =
new ObjectInputStream(mClient.getInputStream());
while (true) {
final LoggingEvent event = (LoggingEvent) ois.readObject();
mModel.addEvent(new EventDetails(event));
}
} catch (EOFException e) {
LOG.info("Reached EOF, closing connection");
} catch (SocketException e) {
LOG.info("Caught SocketException, closing connection");
} catch (IOException e) {
LOG.warn("Got IOException, closing connection", e);
} catch (ClassNotFoundException e) {
LOG.warn("Got ClassNotFoundException, closing connection", e);
}
try {
mClient.close();
} catch (IOException e) {
LOG.warn("Error closing connection", e);
}
}
}
/** where to put the events **/
private MyTableModel mModel;
/** server for listening for connections **/
private ServerSocket mSvrSock;
/**
* Creates a new LoggingReceiver instance.
*
* @param aModel model to place put received into
* @param aPort port to listen on
* @throws IOException if an error occurs
*/
LoggingReceiver(MyTableModel aModel, int aPort) throws IOException {
setDaemon(true);
mModel = aModel;
mSvrSock = new ServerSocket(aPort);
}
/** Listens for client connections **/
public void run() {
LOG.info("Thread started");
try {
while (true) {
LOG.debug("Waiting for a connection");
final Socket client = mSvrSock.accept();
LOG.debug("Got a connection from " +
client.getInetAddress().getHostName());
final Thread t = new Thread(new Slurper(client));
t.setDaemon(true);
t.start();
}
} catch (IOException e) {
LOG.error("Error in accepting connections, stopping.", e);
}
}
}