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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.common.transaction.mngr;
import java.util.Queue;
import java.util.concurrent.atomic.AtomicInteger;
import javax.annotation.Resource;
import org.openecomp.sdc.be.dao.impl.ESCatalogDAO;
import org.openecomp.sdc.be.dao.titan.TitanGenericDao;
import org.openecomp.sdc.common.transaction.api.ITransactionSdnc;
import org.openecomp.sdc.common.transaction.api.TransactionUtils;
import org.openecomp.sdc.common.transaction.api.TransactionUtils.ActionTypeEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import com.google.common.collect.EvictingQueue;
import com.google.common.collect.Queues;
@Component("transactionManager")
public class TransactionManager {
private static Logger log = LoggerFactory.getLogger(TransactionManager.class.getName());
private AtomicInteger transactionIDCounter = new AtomicInteger(0);
private Queue<ITransactionSdnc> transactions;
@Resource
private ESCatalogDAO esCatalogDao;
@Resource
private TitanGenericDao titanGenericDao;
/**
* userId and actionType parameters are used only for logging purposes.
*/
public ITransactionSdnc getTransaction(String userId, ActionTypeEnum actionType) {
if (transactions == null) {
init();
}
log.debug("TransactionManager creating new SdncTransaction");
ITransactionSdnc tx = new TransactionSdncImpl(generateTransactionID(), userId, actionType, esCatalogDao, titanGenericDao);
transactions.add(tx);
return tx;
}
private Integer generateTransactionID() {
boolean generatedSuccessfully = false;
int nextId = 0;
while (!generatedSuccessfully) {
int prevId = transactionIDCounter.get();
if (prevId > TransactionUtils.TRANSACTION_ID_RESET_LIMIT) {
resetTransactionId();
}
nextId = prevId + 1;
generatedSuccessfully = transactionIDCounter.compareAndSet(prevId, nextId);
}
return nextId;
}
private void resetTransactionId() {
boolean resetSuccessfully = false;
while (!resetSuccessfully) {
int prevId = transactionIDCounter.get();
resetSuccessfully = transactionIDCounter.compareAndSet(prevId, 0);
}
}
private synchronized void init() {
if (transactions == null) {
log.info("TransactionManager Initialized");
EvictingQueue<ITransactionSdnc> queue = EvictingQueue
.<ITransactionSdnc>create(TransactionUtils.MAX_SIZE_TRANSACTION_LIST);
// make thread-safe
transactions = Queues.synchronizedQueue(queue);
}
}
}
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