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package com.orbekk.protobuf;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.io.OutputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import com.google.protobuf.Message;
import com.google.protobuf.Service;
import com.google.protobuf.RpcController;
import com.google.protobuf.RpcCallback;
import com.google.protobuf.Descriptors;
import java.util.Map;
import java.util.HashMap;
public class SimpleProtobufServer extends Thread {
private static Logger logger = Logger.getLogger(
SimpleProtobufServer.class.getName());
private ServerSocket serverSocket;
private Map<String, Service> registeredServices =
new HashMap<String, Service>();
public static SimpleProtobufServer create(int port) {
try {
InetSocketAddress address = new InetSocketAddress(port);
ServerSocket serverSocket = new ServerSocket();
serverSocket.setReuseAddress(true);
serverSocket.bind(address);
return new SimpleProtobufServer(serverSocket);
} catch (IOException e) {
logger.log(Level.WARNING, "Could not create server. ", e);
return null;
}
}
public SimpleProtobufServer(ServerSocket serverSocket) {
this.serverSocket = serverSocket;
}
public synchronized 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(Rpc.Request request, OutputStream out)
throws IOException {
Service service = registeredServices.get(request.getFullServiceName());
final Rpc.Response.Builder response = Rpc.Response.newBuilder();
response.setRequestId(request.getRequestId());
if (service == null) {
response.setError(Rpc.Response.Error.UNKNOWN_SERVICE);
response.build().writeDelimitedTo(out);
return;
}
Descriptors.MethodDescriptor method = service.getDescriptorForType()
.findMethodByName(request.getMethodName());
if (method == null) {
response.setError(Rpc.Response.Error.UNKNOWN_METHOD);
response.build().writeDelimitedTo(out);
return;
}
RpcCallback<Message> doneCallback = new RpcCallback<Message>() {
@Override public void run(Message responseMessage) {
response.setResponseProto(responseMessage.toByteString());
}
};
Message requestMessage = service.getRequestPrototype(method)
.toBuilder()
.mergeFrom(request.getRequestProto())
.build();
service.callMethod(method, null, requestMessage, doneCallback);
response.build().writeDelimitedTo(out);
}
private void handleConnection(final Socket connection) {
new Thread(new Runnable() {
@Override public void run() {
try {
while (true) {
Rpc.Request r1 = Rpc.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) {
}
}
}
}).start();
}
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);
}
}
}
public static void main(String[] args) {
SimpleProtobufServer server = SimpleProtobufServer.create(10000);
Test.TestService testService = new Test.TestService() {
@Override public void run(RpcController controller,
Test.TestRequest request,
RpcCallback<Test.TestResponse> done) {
System.out.println("Hello from TestService!");
done.run(Test.TestResponse.newBuilder()
.setId("Hello from server.")
.build());
}
};
server.registerService(testService);
server.start();
try {
server.join();
} catch (InterruptedException e) {
System.out.println("Stopped.");
}
}
}
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