/**
* 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 com.google.protobuf.ByteString;
import org.apache.hedwig.client.api.Subscriber;
import org.apache.hedwig.exceptions.PubSubException;
import org.apache.hedwig.exceptions.PubSubException.ClientNotSubscribedException;
import org.apache.hedwig.protocol.PubSubProtocol.PubSubRequest;
import org.apache.hedwig.server.handlers.Handler;
import org.apache.hedwig.server.netty.UmbrellaHandler;
public class ProxyStopDeliveryHandler implements Handler {
static final Logger logger = LoggerFactory.getLogger(ProxyStopDeliveryHandler.class);
Subscriber subscriber;
ChannelTracker tracker;
public ProxyStopDeliveryHandler(Subscriber subscriber, ChannelTracker tracker) {
this.subscriber = subscriber;
this.tracker = tracker;
}
@Override
public void handleRequest(PubSubRequest request, Channel channel) {
if (!request.hasStopDeliveryRequest()) {
UmbrellaHandler.sendErrorResponseToMalformedRequest(channel, request.getTxnId(),
"Missing stop delivery request data");
return;
}
final ByteString topic = request.getTopic();
final ByteString subscriberId = request.getStartDeliveryRequest().getSubscriberId();
synchronized (tracker) {
try {
tracker.checkChannelMatches(topic, subscriberId, channel);
} catch (PubSubException e) {
// intentionally ignore this error, since stop delivery doesn't
// send back a response
return;
}
try {
subscriber.stopDelivery(topic, subscriberId);
} catch (ClientNotSubscribedException e) {
// This should not happen, since we already checked the correct
// channel and so on
logger.warn("Unexpected: No subscription when attempting to stop delivery", e);
}
}
}
}