/*
* Copyright 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
*
* WSO2 Inc. 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.wso2.carbon.registry.event.core.sharedmemory;
import org.apache.axis2.clustering.ClusteringFault;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.registry.event.core.sharedmemory.util.SharedMemoryCacheConstants;
import org.wso2.carbon.registry.event.core.sharedmemory.util.SharedMemoryCacheUtil;
import org.wso2.carbon.registry.event.core.subscription.Subscription;
import org.wso2.carbon.registry.event.core.exception.EventBrokerException;
import javax.cache.Cache;
import javax.cache.CacheConfiguration;
import javax.cache.CacheManager;
import javax.cache.Caching;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.TimeUnit;
/**
* this class is used to keep the details of the subscription storage. Simply this contains
* maps to keep the subscription object details with the topic details
*/
@SuppressWarnings("serial")
public class SharedMemorySubscriptionStorage implements Serializable {
private static boolean topicSubscriptionCacheInit =false;
private static boolean tenantIDInMemorySubscriptionStorageCacheInit = false;
private static final Log log = LogFactory.getLog(SharedMemorySubscriptionStorage.class);
/**
* Cache to keep the subscription details with the topics. This is important in finding subscriptions
* for a particular topic when publishing a message to a topic.
*/
public static Cache<String, SubscriptionContainer> getTopicSubscriptionCache() {
if (topicSubscriptionCacheInit) {
return Caching.getCacheManagerFactory()
.getCacheManager(SharedMemoryCacheConstants.INMEMORY_EVENT_CACHE_MANAGER)
.getCache(SharedMemoryCacheConstants.TOPIC_SUBSCRIPTION_CACHE);
} else {
CacheManager cacheManager = Caching.getCacheManagerFactory()
.getCacheManager(SharedMemoryCacheConstants.INMEMORY_EVENT_CACHE_MANAGER);
topicSubscriptionCacheInit = true;
return cacheManager.<String, SubscriptionContainer>createCacheBuilder(SharedMemoryCacheConstants.TOPIC_SUBSCRIPTION_CACHE).
setExpiry(CacheConfiguration.ExpiryType.MODIFIED, new CacheConfiguration.Duration(TimeUnit.SECONDS,
SharedMemoryCacheConstants.CACHE_INVALIDATION_TIME)).
setExpiry(CacheConfiguration.ExpiryType.ACCESSED, new CacheConfiguration.Duration(TimeUnit.SECONDS,
SharedMemoryCacheConstants.CACHE_INVALIDATION_TIME)).
setStoreByValue(false).build();
}
}
public static Cache<String, String> getSubscriptionIDTopicNameCache() {
if (tenantIDInMemorySubscriptionStorageCacheInit) {
return Caching.getCacheManagerFactory()
.getCacheManager(SharedMemoryCacheConstants.INMEMORY_EVENT_CACHE_MANAGER)
.getCache(SharedMemoryCacheConstants.SUBSCRIPTION_ID_TOPIC_NAME_CACHE);
} else {
CacheManager cacheManager = Caching.getCacheManagerFactory()
.getCacheManager(SharedMemoryCacheConstants.INMEMORY_EVENT_CACHE_MANAGER);
tenantIDInMemorySubscriptionStorageCacheInit = true;
return cacheManager.<String, String>createCacheBuilder(SharedMemoryCacheConstants.SUBSCRIPTION_ID_TOPIC_NAME_CACHE).
setExpiry(CacheConfiguration.ExpiryType.MODIFIED, new CacheConfiguration.Duration(TimeUnit.SECONDS,
SharedMemoryCacheConstants.CACHE_INVALIDATION_TIME)).
setExpiry(CacheConfiguration.ExpiryType.ACCESSED, new CacheConfiguration.Duration(TimeUnit.SECONDS,
SharedMemoryCacheConstants.CACHE_INVALIDATION_TIME)).
setStoreByValue(false).build();
}
}
public SharedMemorySubscriptionStorage() {
}
public void addSubscription(Subscription subscription) {
String topicName = getTopicName(subscription.getTopicName());
SubscriptionContainer subscriptionsContainer = getTopicSubscriptionCache().get(topicName);
if (subscriptionsContainer == null){
subscriptionsContainer = new SubscriptionContainer(topicName);
}
subscriptionsContainer.getSubscriptionsCache().put(subscription.getId(), subscription);
getTopicSubscriptionCache().put(topicName, subscriptionsContainer);
getSubscriptionIDTopicNameCache().put(subscription.getId(), topicName);
//send cluster message to inform other nodes about subscription added to the system, so that everyone can add new one.
try {
SharedMemoryCacheUtil.sendAddSubscriptionClusterMessage(topicName, subscription.getId(),
subscription.getTenantId(),
subscription.getTenantDomain());
} catch (ClusteringFault e) {
//This happen due to hazelcast clustering not setup correctly. subscription cluster will not send to other nodes.
log.error("Subscription cluster message sending failed",e);
}
}
public List<Subscription> getMatchingSubscriptions(String topicName) {
topicName = getTopicName(topicName);
List<Subscription> subscriptions = new ArrayList<Subscription>();
List<String> matchingTopicNames = getTopicMatchingNames(topicName);
for (String matchingTopicName : matchingTopicNames){
if (getTopicSubscriptionCache().get(matchingTopicName) != null){
SubscriptionContainer matchingContainer = getTopicSubscriptionCache().get(matchingTopicName);
Iterator<String> keysOfSubscription = matchingContainer.getSubscriptionsCache().keys();
while(keysOfSubscription.hasNext()) {
String key = keysOfSubscription.next();
subscriptions.add(matchingContainer.getSubscriptionsCache().get(key));
}
}
}
return subscriptions;
}
public void unSubscribe(String subscriptionID) throws EventBrokerException {
String topicName = getTopicName(getSubscriptionIDTopicNameCache().get(subscriptionID));
if (topicName == null){
throw new EventBrokerException("Subscription with ID " + subscriptionID + " does not exits");
}
SubscriptionContainer subscriptionContainer = getTopicSubscriptionCache().get(topicName);
if (subscriptionContainer == null){
throw new EventBrokerException("Subscription with ID " + subscriptionID + " does not exits");
}
subscriptionContainer.getSubscriptionsCache().remove(subscriptionID);
getSubscriptionIDTopicNameCache().remove(subscriptionID);
}
public void renewSubscription(Subscription subscription) throws EventBrokerException {
String topicName = getTopicName(subscription.getTopicName());
SubscriptionContainer subscriptionContainer = getTopicSubscriptionCache().get(topicName);
if (subscriptionContainer == null){
throw new EventBrokerException("There is no subscriptions with topic " + topicName);
}
Subscription existingSubscription = subscriptionContainer.getSubscriptionsCache().get(subscription.getId());
if (existingSubscription == null){
throw new EventBrokerException("There is no subscription with subscription id " + subscription.getId());
}
existingSubscription.setExpires(subscription.getExpires());
existingSubscription.setProperties(subscription.getProperties());
String val = subscription.getProperties().get("notVerfied");
if(val == null) {
getSubscriptionIDTopicNameCache().put(subscription.getId()+"-notVerfied", "false");
} else {
if("true".equalsIgnoreCase(val)) {
getSubscriptionIDTopicNameCache().put(subscription.getId()+"-notVerfied", "true");
} else {
getSubscriptionIDTopicNameCache().put(subscription.getId()+"-notVerfied", "false");
}
}
}
private List<String> getTopicMatchingNames(String topicName) {
List<String> matchingTopicNames = new ArrayList<String>();
if (topicName.equals("/")) {
matchingTopicNames.add("/#");
} else {
String currentTopicName = "";
String[] topicParts = topicName.split("/");
//the first part if the split parts are "" since always topics start with /
int i = 0;
while (i < (topicParts.length)) {
currentTopicName = currentTopicName + topicParts[i] + "/";
matchingTopicNames.add(currentTopicName + "#");
if (i == (topicParts.length - 1)||i == (topicParts.length - 2)) {
matchingTopicNames.add(currentTopicName + "*");
}
i++;
}
}
matchingTopicNames.add(topicName);
return matchingTopicNames;
}
private String getTopicName(String topicName){
if (!topicName.startsWith("/")){
topicName = "/" + topicName;
}
if (topicName.endsWith("/") && (topicName.length() != 1)){
topicName = topicName.substring(0, topicName.lastIndexOf('/'));
}
return topicName;
}
}