/**
* 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.apache.hedwig.server.proxy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.jboss.netty.channel.Channel;
import org.apache.hedwig.client.api.Subscriber;
import org.apache.hedwig.client.data.TopicSubscriber;
import org.apache.hedwig.exceptions.PubSubException;
import org.apache.hedwig.exceptions.PubSubException.TopicBusyException;
import org.apache.hedwig.protocol.PubSubProtocol.PubSubRequest;
import org.apache.hedwig.protocol.PubSubProtocol.SubscribeRequest;
import org.apache.hedwig.protoextensions.PubSubResponseUtils;
import org.apache.hedwig.server.handlers.ChannelDisconnectListener;
import org.apache.hedwig.server.handlers.Handler;
import org.apache.hedwig.server.netty.UmbrellaHandler;
import org.apache.hedwig.util.Callback;
public class ProxySubscribeHandler implements Handler, ChannelDisconnectListener {
static final Logger logger = LoggerFactory.getLogger(ProxySubscribeHandler.class);
Subscriber subscriber;
ChannelTracker tracker;
public ProxySubscribeHandler(Subscriber subscriber, ChannelTracker tracker) {
this.subscriber = subscriber;
this.tracker = tracker;
}
@Override
public void channelDisconnected(Channel channel) {
tracker.channelDisconnected(channel);
}
@Override
public void handleRequest(final PubSubRequest request, final Channel channel) {
if (!request.hasSubscribeRequest()) {
UmbrellaHandler.sendErrorResponseToMalformedRequest(channel, request.getTxnId(),
"Missing subscribe request data");
return;
}
SubscribeRequest subRequest = request.getSubscribeRequest();
final TopicSubscriber topicSubscriber = new TopicSubscriber(request.getTopic(), subRequest.getSubscriberId());
subscriber.asyncSubscribe(topicSubscriber.getTopic(), subRequest.getSubscriberId(), subRequest
.getCreateOrAttach(), new Callback<Void>() {
@Override
public void operationFailed(Object ctx, PubSubException exception) {
channel.write(PubSubResponseUtils.getResponseForException(exception, request.getTxnId()));
}
@Override
public void operationFinished(Object ctx, Void resultOfOperation) {
try {
tracker.subscribeSucceeded(topicSubscriber, channel);
} catch (TopicBusyException e) {
channel.write(PubSubResponseUtils.getResponseForException(e, request.getTxnId()));
return;
}
channel.write(PubSubResponseUtils.getSuccessResponse(request.getTxnId()));
}
}, null);
}
}