From cecb501245bb7d93b2e4c55acb783958b158f637 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kjetil=20=C3=98rbekk?= <kjetil.orbekk@gmail.com>
Date: Wed, 28 Mar 2012 09:50:34 +0200
Subject: Support very simple serving.
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– Not asynchronous at this point.
– Not well-tested.
---
 .../com/orbekk/protobuf/SimpleProtobufServer.java  | 79 +++++++++++++++++++---
 1 file changed, 71 insertions(+), 8 deletions(-)

(limited to 'src/main/java/com/orbekk/protobuf/SimpleProtobufServer.java')

diff --git a/src/main/java/com/orbekk/protobuf/SimpleProtobufServer.java b/src/main/java/com/orbekk/protobuf/SimpleProtobufServer.java
index 57afae9..0a20883 100644
--- a/src/main/java/com/orbekk/protobuf/SimpleProtobufServer.java
+++ b/src/main/java/com/orbekk/protobuf/SimpleProtobufServer.java
@@ -2,16 +2,26 @@ 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());
-    ServerSocket serverSocket;
+    private ServerSocket serverSocket;
+    private Map<String, Service> registeredServices =
+            new HashMap<String, Service>();
 
     public static SimpleProtobufServer create(int port) {
         try {
@@ -30,16 +40,52 @@ public class SimpleProtobufServer extends Thread {
         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();
+        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);
+    }
+
     private void handleConnection(final Socket connection) {
         new Thread(new Runnable() {
             @Override public void run() {
                 try {
-                    Rpc.Request r1 = Rpc.Request.parseDelimitedFrom(
-                        connection.getInputStream());
-                    Rpc.Request r2 = Rpc.Request.parseDelimitedFrom(
-                        connection.getInputStream());
-                    System.out.println(r1);
-                    System.out.println(r2);
+                    while (true) {
+                        Rpc.Request r1 = Rpc.Request.parseDelimitedFrom(
+                            connection.getInputStream());
+                        handleRequest(r1, connection.getOutputStream());
+                    }
                 } catch (IOException e) {
                     logger.info("Closed connection: " + connection);
                 } finally {
@@ -66,6 +112,23 @@ public class SimpleProtobufServer extends Thread {
     }
 
     public static void main(String[] args) {
-        SimpleProtobufServer.create(10000).start();
+        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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