| /** |
| * 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 org.waveprotocol.box.server.rpc; |
| |
| import org.waveprotocol.wave.util.logging.Log; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.BiMap; |
| import com.google.common.collect.HashBiMap; |
| import com.google.protobuf.Descriptors.MethodDescriptor; |
| import com.google.protobuf.Message; |
| import com.google.protobuf.RpcCallback; |
| import com.google.protobuf.RpcController; |
| |
| import org.eclipse.jetty.websocket.client.ClientUpgradeRequest; |
| import org.eclipse.jetty.websocket.client.WebSocketClient; |
| |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.net.SocketAddress; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * Implementation of {@link ClientRpcChannel} based on a |
| * {@link WebSocketClientChannel}. |
| */ |
| public class WebSocketClientRpcChannel implements ClientRpcChannel { |
| private static final Log LOG = Log.get(WebSocketClientRpcChannel.class); |
| |
| private final WebSocketClient socketClient; |
| private final WebSocketChannel clientChannel; |
| private final AtomicInteger lastSequenceNumber = new AtomicInteger(); |
| private final BiMap<Integer, ClientRpcController> activeMethodMap = HashBiMap.create(); |
| |
| /** |
| * Set up a new WebSocketClientRpcChannel pointing at the given server |
| * address. |
| * |
| * @param serverAddress the target server address |
| */ |
| public WebSocketClientRpcChannel(SocketAddress serverAddress) |
| throws IOException { |
| Preconditions.checkNotNull(serverAddress, "null serverAddress"); |
| |
| ProtoCallback callback = new ProtoCallback() { |
| @Override |
| public void message(int sequenceNo, Message message) { |
| final ClientRpcController controller; |
| synchronized (activeMethodMap) { |
| controller = activeMethodMap.get(sequenceNo); |
| // TODO: remove controller from activeMethodMap |
| } |
| if (message instanceof Rpc.RpcFinished) { |
| Rpc.RpcFinished finished = (Rpc.RpcFinished) message; |
| if (finished.getFailed()) { |
| controller.failure(finished.getErrorText()); |
| } else { |
| controller.response(null); |
| } |
| } else { |
| controller.response(message); |
| } |
| } |
| }; |
| clientChannel = new WebSocketChannelImpl(callback); |
| socketClient = openWebSocket(clientChannel, (InetSocketAddress) serverAddress); |
| clientChannel.expectMessage(Rpc.RpcFinished.getDefaultInstance()); |
| LOG.fine("Opened a new WebSocketClientRpcChannel to " + serverAddress); |
| } |
| |
| @Override |
| public RpcController newRpcController() { |
| return new ClientRpcController(this); |
| } |
| |
| @Override |
| public void callMethod(MethodDescriptor method, RpcController genericRpcController, |
| Message request, Message responsePrototype, RpcCallback<Message> callback) { |
| // Cast the given generic controller to a ClientRpcController. |
| final ClientRpcController controller; |
| if (genericRpcController instanceof ClientRpcController) { |
| controller = (ClientRpcController) genericRpcController; |
| } else { |
| throw new IllegalArgumentException("Expected ClientRpcController, got: " |
| + genericRpcController.getClass()); |
| } |
| |
| // Generate a new sequence number, and configure the controller - notably, |
| // this throws an IllegalStateException if it is *already* configured. |
| final int sequenceNo = lastSequenceNumber.incrementAndGet(); |
| final ClientRpcController.RpcState rpcStatus = |
| new ClientRpcController.RpcState(this, method.getOptions() |
| .getExtension(Rpc.isStreamingRpc), callback, new Runnable() { |
| @Override |
| public void run() { |
| clientChannel.sendMessage(sequenceNo, Rpc.CancelRpc.getDefaultInstance()); |
| } |
| }); |
| controller.configure(rpcStatus); |
| synchronized (activeMethodMap) { |
| activeMethodMap.put(sequenceNo, controller); |
| } |
| LOG.fine("Calling a new RPC (seq " + sequenceNo + "), method " + method.getFullName() + " for " |
| + clientChannel); |
| |
| // Kick off the RPC by sending the request to the server end-point. |
| clientChannel.sendMessage(sequenceNo, request, responsePrototype); |
| } |
| |
| private WebSocketClient openWebSocket(WebSocketChannel clientChannel, |
| InetSocketAddress inetAddress) throws IOException { |
| URI uri; |
| try { |
| uri = new URI("ws", null, inetAddress.getHostName(), inetAddress.getPort(), "/socket", |
| null, null); |
| } catch (URISyntaxException e) { |
| LOG.severe("Unable to create ws:// uri from given address (" + inetAddress + ")", e); |
| throw new IllegalStateException(e); |
| } |
| WebSocketClient client = new WebSocketClient(); |
| try { |
| client.start(); |
| } catch (Exception ex) { |
| throw new RuntimeException(ex); |
| } |
| ClientUpgradeRequest request = new ClientUpgradeRequest(); |
| try { |
| client.connect(clientChannel, uri, request).get(); |
| } catch (Exception ex) { |
| throw new IOException(ex); |
| } |
| return client; |
| } |
| } |