/*
* 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 gobblin.tunnel;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.Vector;
/**
* A convenient-to-use TCP server class to implement mock test servers.
*
* @author kkandekar@linkedin.com
*/
abstract class MockServer {
protected static final Logger LOG = LoggerFactory.getLogger(MockServer.class);
volatile boolean _serverRunning = true;
ServerSocket _server;
Set<EasyThread> _threads = Collections.synchronizedSet(new HashSet<EasyThread>());
List<Socket> _sockets = new Vector<Socket>();
int _serverSocketPort;
int numConnects = 0; //only counted for proxy connects
static void sleepQuietly(long millis) {
try {
Thread.sleep(millis);
} catch (InterruptedException e) {
}
}
public MockServer start() throws IOException {
_server = new ServerSocket();
_server.setSoTimeout(5000);
_server.bind(new InetSocketAddress("localhost", 0));
_serverSocketPort = _server.getLocalPort();
_threads.add(new EasyThread() {
@Override
void runQuietly() throws Exception {
runServer();
}
}.startThread());
return this;
}
// accept thread
public void runServer() {
while (_serverRunning) {
try {
final Socket clientSocket = _server.accept();
numConnects++;
LOG.info("Accepted connection on " + getServerSocketPort());
// client handler thread
_threads.add(new EasyThread() {
@Override
void runQuietly() throws Exception {
try {
addSocket(clientSocket);
handleClientSocket(clientSocket);
} catch (IOException e) {
LOG.info("Exception in handleClientSocket, stopping server", e);
stopServer();
}
}
}.startThread());
} catch (IOException e) {
LOG.info("Exception in runServer", e);
}
}
try {
_server.close();
} catch (IOException e) {
LOG.info("Exception while closing server", e);
}
}
int getNumConnects() {
return numConnects;
}
boolean isServerRunning() {
return _serverRunning;
}
int getServerSocketPort() {
return _serverSocketPort;
}
// need to keep track of socket because interrupting thread is not working
void addSocket(Socket socket) {
_sockets.add(socket);
}
abstract void handleClientSocket(Socket socket) throws IOException;
public void stopServer() {
_serverRunning = false;
IOUtils.closeQuietly(_server);
for (Socket socket : _sockets) {
IOUtils.closeQuietly(socket);
}
for (EasyThread thread : _threads) {
thread.interrupt();
}
}
}