SubscriptionContainer.java

/*
 *  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.wso2.carbon.registry.event.core.sharedmemory.util.SharedMemoryCacheConstants;
import org.wso2.carbon.registry.event.core.subscription.Subscription;
import org.wso2.carbon.registry.event.core.util.EventBrokerConstants;

import javax.cache.Cache;
import javax.cache.CacheConfiguration;
import javax.cache.CacheManager;
import javax.cache.Caching;
import java.io.Serializable;
import java.util.concurrent.TimeUnit;

/**
 * Subscription container is used to keep track of caches related to a given topic name,
 * across the nodes in the cluster.
 */

@SuppressWarnings("serial")
public class SubscriptionContainer implements Serializable {
    //variable to store the cache name related to this container (this container's topic name)
    private String topicCacheName = null;
    private boolean topicCacheInit = false;

    public SubscriptionContainer(String topicName) {
        this.topicCacheName = topicName.replace("*", EventBrokerConstants.STAR_CHARACTER_FOR_CACHE_NAMES);
    }

    public Cache<String, Subscription> getSubscriptionsCache() {
        if (topicCacheInit) {
            return Caching.getCacheManagerFactory()
            		.getCacheManager(SharedMemoryCacheConstants.INMEMORY_EVENT_CACHE_MANAGER).getCache(topicCacheName);
        } else {
            CacheManager cacheManager = Caching.getCacheManagerFactory()
            		.getCacheManager(SharedMemoryCacheConstants.INMEMORY_EVENT_CACHE_MANAGER);
            String cacheName = topicCacheName;

            Cache<String, Subscription> newCache = cacheManager.<String, Subscription>createCacheBuilder(cacheName).
                    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();

            topicCacheInit = true;

            return newCache;
        }
    }
}