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/**
* ============LICENSE_START==========================================
* org.onap.aai
* ===================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017-2018 Amdocs
* ===================================================================
* Modifications Copyright (C) 2019 IBM.
* ===================================================================
* 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.
* ============LICENSE_END============================================
*/
package org.onap.champ.service;
import java.util.concurrent.TimeUnit;
import org.onap.aai.champcore.ChampGraph;
import org.onap.aai.champcore.ChampTransaction;
import org.onap.aai.champcore.exceptions.ChampTransactionException;
import org.onap.champ.service.logging.ChampMsgs;
import org.onap.aai.cl.api.Logger;
import org.onap.aai.cl.eelf.LoggerFactory;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.RemovalCause;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
/**
* Self expiring Cache to hold request transactionIds . Events are expired
* automatically after configured interval
*/
public class ChampTransactionCache {
private static Logger logger = LoggerFactory.getInstance().getLogger(ChampTransactionCache
.class.getName());
private ChampGraph graphImpl;
private Cache<String, ChampTransaction> cache;
public ChampTransactionCache(long txTimeOutInSec,ChampGraph graphImpl) {
CacheBuilder builder = CacheBuilder.newBuilder().expireAfterWrite(txTimeOutInSec, TimeUnit.SECONDS)
.removalListener(new RemovalListener() {
public void onRemoval(RemovalNotification notification) {
if(notification.getCause()==RemovalCause.EXPIRED){
logger.info(ChampMsgs.CHAMP_TX_CACHE, "Following transaction: "+notification.getKey()+" is being evicted from cache due to timeout of " + txTimeOutInSec+" seconds");
try {
graphImpl.rollbackTransaction((ChampTransaction) notification.getValue());
logger.info(ChampMsgs.CHAMP_TX_CACHE, "Transaction rolledback successfully :" + notification.getKey());
} catch (ChampTransactionException e) {
logger.error(ChampMsgs.CHAMP_DATA_SERVICE_ERROR, e, "Transaction rolledback failed :");
}
}
}
});
cache = builder.build();
this.graphImpl = graphImpl;
}
public void put(String txId, ChampTransaction tx) {
cache.put(txId, tx);
}
public ChampTransaction get(String txId) {
if (txId==null)
return null;
if(cache.getIfPresent(txId)==null){
//cleanup cache so that removalListener is called
cache.cleanUp();
}
return cache.getIfPresent(txId);
}
public void invalidate(String txId) {
cache.invalidate(txId);
}
}
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