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/**
* Copyright 2012 Kjetil Ørbekk <kjetil.orbekk@gmail.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.orbekk.protobuf;
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.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.google.protobuf.Service;
public class SimpleProtobufServer extends Thread {
private static int DEFAULT_NUM_HANDLERS = 20;
private static int DEFAULT_CONCURRENT_REQUESTS = 1;
private final static Logger logger = Logger.getLogger(
SimpleProtobufServer.class.getName());
private final ServerSocket serverSocket;
private final ExecutorService incomingHandlerPool;
private final ExecutorService outgoingHandlerPool =
Executors.newCachedThreadPool();
private final ExecutorService requestHandlerPool;
private final ServiceHolder services = new ServiceHolder();
private final Set<ConnectionHandler> activeConnections =
Collections.synchronizedSet(new HashSet<ConnectionHandler>());
public static SimpleProtobufServer create(int port) {
return create(port, DEFAULT_NUM_HANDLERS, DEFAULT_CONCURRENT_REQUESTS);
}
public static SimpleProtobufServer create(int port, int maxNumHandlers,
int maxConcurrentRequests) {
try {
InetSocketAddress address = new InetSocketAddress(port);
ServerSocket serverSocket = new ServerSocket();
serverSocket.setReuseAddress(true);
serverSocket.bind(address);
ExecutorService incomingHandlerPool =
Executors.newFixedThreadPool(maxNumHandlers);
ExecutorService requestHandlerPool =
Executors.newFixedThreadPool(maxConcurrentRequests);
return new SimpleProtobufServer(serverSocket, incomingHandlerPool,
requestHandlerPool);
} catch (IOException e) {
logger.log(Level.WARNING, "Could not create server. ", e);
return null;
}
}
public SimpleProtobufServer(ServerSocket serverSocket,
ExecutorService incomingHandlerPool,
ExecutorService requestHandlerPool) {
this.serverSocket = serverSocket;
this.incomingHandlerPool = incomingHandlerPool;
this.requestHandlerPool = requestHandlerPool;
}
public int getPort() {
return serverSocket.getLocalPort();
}
public void registerService(Service service) {
services.registerService(service);
}
private synchronized void handleConnection(Socket connection) {
if (serverSocket.isClosed()) {
return;
}
final ConnectionHandler handler = ConnectionHandler.create(
connection, requestHandlerPool, services);
activeConnections.add(handler);
final Runnable realIncomingHandler = handler.createIncomingHandler();
class HelperHandler implements Runnable {
@Override public void run() {
activeConnections.add(handler);
try {
realIncomingHandler.run();
} finally {
activeConnections.remove(handler);
}
}
}
incomingHandlerPool.execute(new HelperHandler());
outgoingHandlerPool.execute(handler.createOutgoingHandler());
}
@Override public synchronized void interrupt() {
super.interrupt();
for (ConnectionHandler handler : activeConnections) {
handler.closeConnection();
}
try {
serverSocket.close();
} catch (IOException e) {
logger.log(Level.WARNING, "Error closing socket.", e);
}
}
public void run() {
logger.info("Running server on port " + serverSocket.getLocalPort());
while (!serverSocket.isClosed()) {
try {
Socket connection = serverSocket.accept();
handleConnection(connection);
} catch (IOException e) {
logger.log(Level.WARNING, "Could not establish connection. ",
e);
}
}
logger.info("Server exits.");
}
}
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