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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.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.HashSet;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import com.google.protobuf.Descriptors;
import com.google.protobuf.Message;
import com.google.protobuf.RpcCallback;
import com.google.protobuf.Service;
public class SimpleProtobufServer extends Thread {
private volatile boolean isStopped = false;
private final static Logger logger = Logger.getLogger(
SimpleProtobufServer.class.getName());
private final ServerSocket serverSocket;
private final Set<Socket> activeClientSockets =
Collections.synchronizedSet(new HashSet<Socket>());
private final Map<String, Service> registeredServices =
Collections.synchronizedMap(new HashMap<String, Service>());
private final ExecutorService pool;
public static SimpleProtobufServer create(int port, int maxNumHandlers) {
try {
InetSocketAddress address = new InetSocketAddress(port);
ServerSocket serverSocket = new ServerSocket();
serverSocket.setReuseAddress(true);
serverSocket.bind(address);
ExecutorService pool =
Executors.newFixedThreadPool(maxNumHandlers);
return new SimpleProtobufServer(serverSocket, pool);
} catch (IOException e) {
logger.log(Level.WARNING, "Could not create server. ", e);
return null;
}
}
public SimpleProtobufServer(ServerSocket serverSocket, ExecutorService pool) {
this.serverSocket = serverSocket;
this.pool = pool;
}
public int getPort() {
return serverSocket.getLocalPort();
}
public void registerService(Service service) {
String serviceName = service.getDescriptorForType().getFullName();
if (registeredServices.containsKey(serviceName)) {
logger.warning("Already registered service with this name.");
}
logger.info("Registering service: " + serviceName);
registeredServices.put(serviceName, service);
}
public void handleRequest(Data.Request request, OutputStream out)
throws IOException {
final Service service = registeredServices.get(request.getFullServiceName());
Rpc rpc = new Rpc();
final Data.Response.Builder response = Data.Response.newBuilder();
response.setRequestId(request.getRequestId());
if (service == null) {
response.setError(Data.Response.RpcError.UNKNOWN_SERVICE);
response.build().writeDelimitedTo(out);
return;
}
final Descriptors.MethodDescriptor method = service.getDescriptorForType()
.findMethodByName(request.getMethodName());
if (method == null) {
response.setError(Data.Response.RpcError.UNKNOWN_METHOD);
response.build().writeDelimitedTo(out);
return;
}
RpcCallback<Message> doneCallback = new RpcCallback<Message>() {
@Override public void run(Message responseMessage) {
if (responseMessage == null) {
responseMessage = service
.getResponsePrototype(method)
.toBuilder().build();
}
response.setResponseProto(responseMessage.toByteString());
}
};
Message requestMessage = service.getRequestPrototype(method)
.toBuilder()
.mergeFrom(request.getRequestProto())
.build();
service.callMethod(method, rpc, requestMessage, doneCallback);
rpc.writeTo(response);
response.build().writeDelimitedTo(out);
}
private void handleConnection(final Socket connection) {
if (isStopped) {
return;
}
Runnable handler = new Runnable() {
@Override public void run() {
logger.info("Handling client connection " + connection);
activeClientSockets.add(connection);
try {
while (true) {
Data.Request r1 = Data.Request.parseDelimitedFrom(
connection.getInputStream());
if (r1 == null) {
try {
connection.close();
} catch (IOException e) {
// Connection is closed.
}
}
handleRequest(r1, connection.getOutputStream());
}
} catch (IOException e) {
logger.info("Closed connection: " + connection);
} finally {
try {
connection.close();
} catch (IOException e) {
}
activeClientSockets.remove(connection);
}
}
};
pool.execute(handler);
}
@Override public void interrupt() {
super.interrupt();
isStopped = true;
for (Socket socket : activeClientSockets) {
try {
socket.close();
} catch (IOException e) {
logger.log(Level.WARNING, "Error closing socket.", e);
}
}
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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