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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.Closeable;
import java.io.IOException;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.google.protobuf.Descriptors;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.Message;
import com.google.protobuf.RpcCallback;
import com.google.protobuf.RpcController;
public class RpcChannel extends Thread implements
com.google.protobuf.RpcChannel {
static final Logger logger =
Logger.getLogger(RpcChannel.class.getName());
private final String host;
private final int port;
private volatile Socket socket = null;
private AtomicLong nextId = new AtomicLong(0);
private Map<Long, RpcChannel.OngoingRequest> rpcs =
Collections.synchronizedMap(
new HashMap<Long, RpcChannel.OngoingRequest>());
private BlockingQueue<Socket> sockets = new LinkedBlockingQueue<Socket>();
private static class OngoingRequest implements Closeable {
long id;
Rpc rpc;
RpcCallback<Message> done;
Message responsePrototype;
Map<Long, RpcChannel.OngoingRequest> rpcs;
public OngoingRequest(long id, Rpc rpc,
RpcCallback<Message> done, Message responsePrototype,
Map<Long, RpcChannel.OngoingRequest> rpcs) {
this.id = id;
this.rpc = rpc;
this.done = done;
this.responsePrototype = responsePrototype;
this.rpcs = rpcs;
}
@Override
public void close() throws IOException {
throw new AssertionError("Not implemented");
}
}
public static RpcChannel create(String host, int port) {
RpcChannel channel = new RpcChannel(host, port);
channel.start();
return channel;
}
private RpcChannel(String host, int port) {
this.host = host;
this.port = port;
}
private Socket getSocket() {
if (socket == null || socket.isClosed()) {
try {
logger.info("Creating new socket to " + host + ":" + port);
socket = new Socket(host, port);
sockets.add(socket);
} catch (UnknownHostException e) {
return null;
} catch (IOException e) {
logger.log(Level.WARNING,
"Could not establish connection.", e);
return null;
}
}
return socket;
}
private Data.Request createRequest(Descriptors.MethodDescriptor method,
RpcController controller,
Message requestMessage,
Message responsePrototype,
RpcCallback<Message> done) {
long id = nextId.incrementAndGet();
Rpc rpc = (Rpc)controller;
OngoingRequest ongoingRequest = new OngoingRequest(id, rpc,
done, responsePrototype, rpcs);
rpcs.put(id, ongoingRequest);
Data.Request request = Data.Request.newBuilder()
.setRequestId(id)
.setFullServiceName(method.getService().getFullName())
.setMethodName(method.getName())
.setRequestProto(requestMessage.toByteString())
.build();
return request;
}
private void finishRequest(Data.Response response) {
OngoingRequest ongoingRequest = rpcs.remove(response.getRequestId());
if (ongoingRequest != null) {
try {
Message responsePb = ongoingRequest.responsePrototype.toBuilder()
.mergeFrom(response.getResponseProto()).build();
ongoingRequest.rpc.readFrom(response);
ongoingRequest.done.run(responsePb);
} catch (InvalidProtocolBufferException e) {
throw new AssertionError("Should fail here.");
}
}
}
@Override public void callMethod(
Descriptors.MethodDescriptor method,
RpcController controller,
Message requestMessage,
Message responsePrototype,
RpcCallback<Message> done) {
try {
Data.Request request = createRequest(method, controller,
requestMessage, responsePrototype, done);
Socket socket = getSocket();
request.writeDelimitedTo(socket.getOutputStream());
} catch (IOException e) {
throw new AssertionError("Should return error.");
}
}
private void handleResponses(Socket socket) {
try {
logger.info("Handling responses to socket " + socket);
while (!socket.isClosed()) {
Data.Response response;
response = Data.Response.parseDelimitedFrom(
socket.getInputStream());
if (response == null) {
throw new IOException("No response.");
}
finishRequest(response);
}
} catch (IOException e) {
if (!rpcs.isEmpty()) {
logger.log(Level.WARNING, "IO Error. Canceling " +
rpcs.size() + " requests.", e);
cancelAllRpcs();
}
} finally {
if (socket != null && !socket.isClosed()) {
try {
socket.close();
} catch (IOException e) {
// Socket is closed.
}
}
}
}
private void cancelAllRpcs() {
synchronized (rpcs) {
for (OngoingRequest request : rpcs.values()) {
request.rpc.setFailed("connection closed");
request.done.run(null);
}
rpcs.clear();
}
}
public void run() {
while (!Thread.interrupted()) {
try {
Socket socket = sockets.take();
handleResponses(socket);
} catch (InterruptedException e) {
// Interrupts handled by outer loop
}
}
}
public void close() {
if (socket != null) {
try {
socket.close();
} catch (IOException e) {
logger.info("Error closing socket.");
}
}
}
}
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