/*
* Copyright (c) 2008-2013, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.topic;
import com.hazelcast.config.TopicConfig;
import com.hazelcast.core.Message;
import com.hazelcast.core.MessageListener;
import com.hazelcast.monitor.impl.LocalTopicStatsImpl;
import com.hazelcast.spi.EventPublishingService;
import com.hazelcast.spi.EventRegistration;
import com.hazelcast.spi.EventService;
import com.hazelcast.spi.ManagedService;
import com.hazelcast.spi.NodeEngine;
import com.hazelcast.spi.RemoteService;
import com.hazelcast.util.ConstructorFunction;
import java.util.Collection;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import static com.hazelcast.util.ConcurrencyUtil.getOrPutSynchronized;
public class TopicService implements ManagedService, RemoteService, EventPublishingService {
public static final String SERVICE_NAME = "hz:impl:topicService";
public static final int ORDERING_LOCKS_LENGTH = 1000;
final ConcurrentMap<String, LocalTopicStatsImpl> statsMap = new ConcurrentHashMap<String, LocalTopicStatsImpl>();
private final Lock[] orderingLocks = new Lock[ORDERING_LOCKS_LENGTH];
private NodeEngine nodeEngine;
private final ConstructorFunction<String, LocalTopicStatsImpl> localTopicStatsConstructorFunction =
new ConstructorFunction<String, LocalTopicStatsImpl>() {
public LocalTopicStatsImpl createNew(String mapName) {
return new LocalTopicStatsImpl();
}
};
private EventService eventService;
@Override
public void init(NodeEngine nodeEngine, Properties properties) {
this.nodeEngine = nodeEngine;
for (int i = 0; i < orderingLocks.length; i++) {
orderingLocks[i] = new ReentrantLock();
}
eventService = nodeEngine.getEventService();
}
@Override
public void reset() {
statsMap.clear();
}
@Override
public void shutdown(boolean terminate) {
reset();
}
public Lock getOrderLock(String key) {
int index = getOrderLockIndex(key);
return orderingLocks[index];
}
private int getOrderLockIndex(String key) {
int hash = key.hashCode();
if (hash == Integer.MIN_VALUE) {
return 0;
} else {
return Math.abs(hash) % orderingLocks.length;
}
}
@Override
public TopicProxy createDistributedObject(String name) {
if (isGlobalOrderingEnabled(name)) {
return new TotalOrderedTopicProxy(name, nodeEngine, this);
} else {
return new TopicProxy(name, nodeEngine, this);
}
}
private boolean isGlobalOrderingEnabled(String name) {
TopicConfig topicConfig = nodeEngine.getConfig().findTopicConfig(name);
return topicConfig.isGlobalOrderingEnabled();
}
@Override
public void destroyDistributedObject(String objectId) {
statsMap.remove(objectId);
}
@Override
public void dispatchEvent(Object event, Object listener) {
TopicEvent topicEvent = (TopicEvent) event;
Object msgObject = nodeEngine.toObject(topicEvent.data);
Message message = new Message(topicEvent.name, msgObject, topicEvent.publishTime, topicEvent.publishingMember);
incrementReceivedMessages(topicEvent.name);
MessageListener messageListener = (MessageListener) listener;
messageListener.onMessage(message);
}
public LocalTopicStatsImpl getLocalTopicStats(String name) {
return getOrPutSynchronized(statsMap, name, statsMap, localTopicStatsConstructorFunction);
}
public void incrementPublishes(String topicName) {
getLocalTopicStats(topicName).incrementPublishes();
}
public void incrementReceivedMessages(String topicName) {
getLocalTopicStats(topicName).incrementReceives();
}
public void publishEvent(String name, TopicEvent event) {
Collection<EventRegistration> registrations = eventService.getRegistrations(TopicService.SERVICE_NAME, name);
eventService.publishEvent(TopicService.SERVICE_NAME, registrations, event, name.hashCode());
}
public String addMessageListener(String name, MessageListener listener) {
EventRegistration eventRegistration = eventService.registerListener(TopicService.SERVICE_NAME, name, listener);
return eventRegistration.getId();
}
public boolean removeMessageListener(String name, String registrationId) {
return eventService.deregisterListener(TopicService.SERVICE_NAME, name, registrationId);
}
}