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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.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
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.Service;
public class RequestDispatcher extends Thread {
private static final Logger logger = Logger.getLogger(RequestDispatcher.class.getName());
public static int DEFAULT_QUEUE_SIZE = 5;
private volatile boolean isStopped = false;
private final BlockingQueue<Data.Response> output;
private final ServiceHolder services;
/** A pool that can be shared among all dispatchers. */
private final ExecutorService pool;
private static class RequestHandler implements Runnable {
private final Data.Request request;
private final Data.Response.Builder response =
Data.Response.newBuilder();
private final BlockingQueue<Data.Response> output;
private final ServiceHolder services;
private final Rpc rpc = new Rpc();
private final RpcCallback<Message> callback =
new RpcCallback<Message>() {
@Override public void run(Message responseMessage) {
if (responseMessage != null) {
response.setResponseProto(responseMessage.toByteString());
}
if (logger.isLoggable(Level.FINER)) {
logger.finer(String.format("I(%d): %s <= ",
request.getRequestId(), responseMessage));
}
rpc.writeTo(response);
try {
output.put(response.build());
} catch (InterruptedException e) {
// Terminate callback.
return;
}
}
};
public RequestHandler(Data.Request request,
BlockingQueue<Data.Response> output,
ServiceHolder services) {
this.request = request;
this.output = output;
this.services = services;
}
public void internalRun() throws InterruptedException {
response.setRequestId(request.getRequestId());
Service service = services.get(request.getFullServiceName());
if (service == null) {
response.setError(Data.Response.RpcError.UNKNOWN_SERVICE);
output.put(response.build());
return;
}
Descriptors.MethodDescriptor method =
service.getDescriptorForType()
.findMethodByName(request.getMethodName());
if (method == null) {
response.setError(Data.Response.RpcError.UNKNOWN_METHOD);
output.put(response.build());
return;
}
Message requestMessage = null;
try {
requestMessage = service.getRequestPrototype(method)
.toBuilder().mergeFrom(request.getRequestProto()).build();
} catch (InvalidProtocolBufferException e) {
response.setError(Data.Response.RpcError.INVALID_PROTOBUF);
output.put(response.build());
return;
}
if (logger.isLoggable(Level.FINER)) {
logger.fine(String.format("I(%d) => %s(%s)",
request.getRequestId(),
method.getFullName(),
requestMessage));
}
service.callMethod(method, rpc, requestMessage, callback);
}
@Override public void run() {
try {
internalRun();
} catch (InterruptedException e) {
// Terminate request.
return;
}
}
}
public RequestDispatcher(ExecutorService pool,
BlockingQueue<Data.Response> output,
ServiceHolder services) {
this.pool = pool;
this.output = output;
this.services = services;
}
public void handleRequest(Data.Request request) throws InterruptedException {
RequestHandler handler = new RequestHandler(request, output, services);
pool.execute(handler);
}
}
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