/**
* 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.handlers;
import org.jboss.netty.channel.Channel;
import com.google.protobuf.ByteString;
import org.apache.bookkeeper.util.MathUtils;
import org.apache.hedwig.client.data.TopicSubscriber;
import org.apache.hedwig.exceptions.PubSubException;
import org.apache.hedwig.protocol.PubSubProtocol.OperationType;
import org.apache.hedwig.protocol.PubSubProtocol.PubSubRequest;
import org.apache.hedwig.protocol.PubSubProtocol.SubscriptionEvent;
import org.apache.hedwig.protocol.PubSubProtocol.UnsubscribeRequest;
import org.apache.hedwig.protoextensions.PubSubResponseUtils;
import org.apache.hedwig.server.common.ServerConfiguration;
import org.apache.hedwig.server.delivery.DeliveryManager;
import org.apache.hedwig.server.netty.ServerStats;
import org.apache.hedwig.server.netty.ServerStats.OpStats;
import org.apache.hedwig.server.netty.UmbrellaHandler;
import org.apache.hedwig.server.subscriptions.SubscriptionManager;
import org.apache.hedwig.server.topics.TopicManager;
import org.apache.hedwig.util.Callback;
import static org.apache.hedwig.util.VarArgs.va;
public class UnsubscribeHandler extends BaseHandler {
SubscriptionManager subMgr;
DeliveryManager deliveryMgr;
SubscriptionChannelManager subChannelMgr;
// op stats
final OpStats unsubStats;
public UnsubscribeHandler(ServerConfiguration cfg,
TopicManager tm,
SubscriptionManager subMgr,
DeliveryManager deliveryMgr,
SubscriptionChannelManager subChannelMgr) {
super(tm, cfg);
this.subMgr = subMgr;
this.deliveryMgr = deliveryMgr;
this.subChannelMgr = subChannelMgr;
unsubStats = ServerStats.getInstance().getOpStats(OperationType.UNSUBSCRIBE);
}
@Override
public void handleRequestAtOwner(final PubSubRequest request, final Channel channel) {
if (!request.hasUnsubscribeRequest()) {
UmbrellaHandler.sendErrorResponseToMalformedRequest(channel, request.getTxnId(),
"Missing unsubscribe request data");
unsubStats.incrementFailedOps();
return;
}
final UnsubscribeRequest unsubRequest = request.getUnsubscribeRequest();
final ByteString topic = request.getTopic();
final ByteString subscriberId = unsubRequest.getSubscriberId();
final long requestTime = MathUtils.now();
subMgr.unsubscribe(topic, subscriberId, new Callback<Void>() {
@Override
public void operationFailed(Object ctx, PubSubException exception) {
channel.write(PubSubResponseUtils.getResponseForException(exception, request.getTxnId()));
unsubStats.incrementFailedOps();
}
@Override
public void operationFinished(Object ctx, Void resultOfOperation) {
// we should not close the channel in delivery manager
// since client waits the response for closeSubscription request
// client side would close the channel
deliveryMgr.stopServingSubscriber(topic, subscriberId, null,
new Callback<Void>() {
@Override
public void operationFailed(Object ctx, PubSubException exception) {
channel.write(PubSubResponseUtils.getResponseForException(exception, request.getTxnId()));
unsubStats.incrementFailedOps();
}
@Override
public void operationFinished(Object ctx, Void resultOfOperation) {
// remove the topic subscription from subscription channels
subChannelMgr.remove(new TopicSubscriber(topic, subscriberId),
channel);
channel.write(PubSubResponseUtils.getSuccessResponse(request.getTxnId()));
unsubStats.updateLatency(System.currentTimeMillis() - requestTime);
}
}, ctx);
}
}, null);
}
}