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/*
* Copyright 2013 gitblit.com.
*
* Licensed 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 com.gitblit.fanout;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketException;
import java.net.SocketTimeoutException;
import java.text.MessageFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A multi-threaded socket implementation of https://github.com/travisghansen/fanout
*
* This implementation creates a master acceptor thread which accepts incoming
* fanout connections and then spawns a daemon thread for each accepted connection.
* If there are 100 concurrent fanout connections, there are 101 threads.
*
* @author James Moger
*
*/
public class FanoutSocketService extends FanoutService {
private final static Logger logger = LoggerFactory.getLogger(FanoutSocketService.class);
private volatile ServerSocket serviceSocket;
public static void main(String[] args) throws Exception {
FanoutSocketService pubsub = new FanoutSocketService(null, DEFAULT_PORT);
pubsub.setStrictRequestTermination(false);
pubsub.setAllowAllChannelAnnouncements(false);
pubsub.start();
}
/**
* Create a multi-threaded fanout service.
*
* @param port
* the port for running the fanout PubSub service
* @throws IOException
*/
public FanoutSocketService(int port) {
this(null, port);
}
/**
* Create a multi-threaded fanout service.
*
* @param bindInterface
* the ip address to bind for the service, may be null
* @param port
* the port for running the fanout PubSub service
* @throws IOException
*/
public FanoutSocketService(String bindInterface, int port) {
super(bindInterface, port, "Fanout socket service");
}
@Override
protected boolean isConnected() {
return serviceSocket != null;
}
@Override
protected boolean connect() {
if (serviceSocket == null) {
try {
serviceSocket = new ServerSocket();
serviceSocket.setReuseAddress(true);
serviceSocket.setSoTimeout(serviceTimeout);
serviceSocket.bind(host == null ? new InetSocketAddress(port) : new InetSocketAddress(host, port));
logger.info(MessageFormat.format("{0} is ready on {1}:{2,number,0}",
name, host == null ? "0.0.0.0" : host, serviceSocket.getLocalPort()));
} catch (IOException e) {
logger.error(MessageFormat.format("failed to open {0} on {1}:{2,number,0}",
name, host == null ? "0.0.0.0" : host, port), e);
return false;
}
}
return true;
}
@Override
protected void disconnect() {
try {
if (serviceSocket != null) {
logger.debug(MessageFormat.format("closing {0} server socket", name));
serviceSocket.close();
serviceSocket = null;
}
} catch (IOException e) {
logger.error(MessageFormat.format("failed to disconnect {0}", name), e);
}
}
/**
* This accepts incoming fanout connections and spawns connection threads.
*/
@Override
protected void listen() throws IOException {
try {
Socket socket;
socket = serviceSocket.accept();
configureClientSocket(socket);
FanoutSocketConnection connection = new FanoutSocketConnection(socket);
if (addConnection(connection)) {
// spawn connection daemon thread
Thread connectionThread = new Thread(connection);
connectionThread.setDaemon(true);
connectionThread.setName("Fanout " + connection.id);
connectionThread.start();
} else {
// synchronously close the connection and remove it
removeConnection(connection);
connection.closeConnection();
connection = null;
}
} catch (SocketTimeoutException e) {
// ignore accept timeout exceptions
}
}
/**
* FanoutSocketConnection handles reading/writing messages from a remote fanout
* connection.
*
* @author James Moger
*
*/
class FanoutSocketConnection extends FanoutServiceConnection implements Runnable {
Socket socket;
FanoutSocketConnection(Socket socket) {
super(socket);
this.socket = socket;
}
/**
* Connection thread read/write method.
*/
@Override
public void run() {
try {
StringBuilder sb = new StringBuilder();
BufferedInputStream is = new BufferedInputStream(socket.getInputStream());
byte[] buffer = new byte[FanoutConstants.BUFFER_LENGTH];
int len = 0;
while (true) {
while (is.available() > 0) {
len = is.read(buffer);
for (int i = 0; i < len; i++) {
byte b = buffer[i];
if (b == 0xa || (!isStrictRequestTermination() && b == 0xd)) {
String req = sb.toString();
sb.setLength(0);
if (req.length() > 0) {
// ignore empty request strings
processRequest(this, req);
}
} else {
sb.append((char) b);
}
}
}
if (!isRunning.get()) {
// service has stopped, terminate client connection
break;
} else {
Thread.sleep(500);
}
}
} catch (Throwable t) {
if (t instanceof SocketException) {
logger.error(MessageFormat.format("fanout connection {0}: {1}", id, t.getMessage()));
} else if (t instanceof SocketTimeoutException) {
logger.error(MessageFormat.format("fanout connection {0}: {1}", id, t.getMessage()));
} else {
logger.error(MessageFormat.format("exception while handling fanout connection {0}", id), t);
}
} finally {
closeConnection();
}
logger.info(MessageFormat.format("thread for fanout connection {0} is finished", id));
}
@Override
protected void reply(String content) throws IOException {
// synchronously send reply
logger.debug(MessageFormat.format("fanout reply to {0}: {1}", id, content));
OutputStream os = socket.getOutputStream();
byte [] bytes = content.getBytes(FanoutConstants.CHARSET);
os.write(bytes);
if (bytes[bytes.length - 1] != 0xa) {
os.write(0xa);
}
os.flush();
}
protected void closeConnection() {
// close the connection socket
try {
socket.close();
} catch (IOException e) {
}
socket = null;
// remove this connection from the service
removeConnection(this);
}
}
}
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