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/*
*  Copyright (c) 2018, 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.caching.impl.clustering;

import org.apache.axis2.clustering.ClusteringAgent;
import org.apache.axis2.clustering.ClusteringFault;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.caching.impl.CachingConstants;
import org.wso2.carbon.caching.impl.DataHolder;
import org.wso2.carbon.caching.impl.Util;
import org.wso2.carbon.utils.multitenancy.MultitenantConstants;

import javax.cache.CacheEntryInfo;
import javax.cache.CacheInvalidationRequestSender;
import javax.cache.event.CacheEntryCreatedListener;
import javax.cache.event.CacheEntryEvent;
import javax.cache.event.CacheEntryListenerException;
import javax.cache.event.CacheEntryRemovedListener;
import javax.cache.event.CacheEntryUpdatedListener;

/**
 * Listens for cache entry removals and updates, and sends a cache invalidation request
 * to the other members in the cluster.
 * 

* This is feature intended only when separate local caches are maintained by each node * in the cluster. */ public class ClusterCacheInvalidationRequestSender implements CacheEntryRemovedListener, CacheEntryUpdatedListener, CacheEntryCreatedListener, CacheInvalidationRequestSender { private static final Log log = LogFactory.getLog(ClusterCacheInvalidationRequestSender.class); @Override public void entryRemoved(CacheEntryEvent event) throws CacheEntryListenerException { send(Util.createCacheInfo(event)); } @Override public void entryUpdated(CacheEntryEvent event) throws CacheEntryListenerException { send(Util.createCacheInfo(event)); } @Override public void entryCreated(CacheEntryEvent event) throws CacheEntryListenerException { // We don't need this as only a delete or an update should invalidate the caches. } private ClusteringAgent getClusteringAgent() { return DataHolder.getInstance().getClusteringAgent(); } @Override public void send(CacheEntryInfo cacheEntryInfo) { String tenantDomain = cacheEntryInfo.getTenantDomain(); int tenantId = cacheEntryInfo.getTenantId(); if (MultitenantConstants.INVALID_TENANT_ID == tenantId) { if (log.isDebugEnabled()) { String stackTrace = ExceptionUtils.getStackTrace(new Throwable()); log.debug("Tenant information cannot be found in the request. This originated from: \n" + stackTrace); } return; } if (!cacheEntryInfo.getCacheName().startsWith(CachingConstants.LOCAL_CACHE_PREFIX) || getClusteringAgent() == null) { return; } int numberOfRetries = 0; if (log.isDebugEnabled()) { log.debug("Sending cache invalidation message to other cluster nodes for '" + cacheEntryInfo.getCacheKey() + "' of the cache '" + cacheEntryInfo.getCacheName() + "' of the cache manager '" + cacheEntryInfo.getCacheManagerName() + "'"); } //Send the cluster message ClusterCacheInvalidationRequest.CacheInfo cacheInfo = new ClusterCacheInvalidationRequest.CacheInfo(cacheEntryInfo.getCacheManagerName(), cacheEntryInfo.getCacheName(), cacheEntryInfo.getCacheKey()); ClusterCacheInvalidationRequest clusterCacheInvalidationRequest = new ClusterCacheInvalidationRequest( cacheInfo, tenantDomain, tenantId); while (numberOfRetries < 60) { try { getClusteringAgent().sendMessage(clusterCacheInvalidationRequest, true); log.debug("Sent [" + clusterCacheInvalidationRequest + "]"); break; } catch (ClusteringFault e) { numberOfRetries++; if (numberOfRetries < 60) { log.warn("Could not send CacheInvalidationMessage for tenant " + tenantId + ". Retry will be attempted in 2s. Request: " + clusterCacheInvalidationRequest, e); } else { log.error("Could not send CacheInvalidationMessage for tenant " + tenantId + ". Several retries failed. Request:" + clusterCacheInvalidationRequest, e); } try { Thread.sleep(2000); } catch (InterruptedException ignored) { } } } } }





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