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/**
* ============LICENSE_START==========================================
* org.onap.aai
* ===================================================================
* Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
* Copyright © 2017-2018 Amdocs
* ===================================================================
* 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.aai.champcore.graph.impl;
import java.security.SecureRandom;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.onap.aai.champcore.ChampCoreMsgs;
import org.onap.aai.champcore.ChampTransaction;
import org.onap.aai.champcore.exceptions.ChampTransactionException;
import org.onap.aai.cl.api.Logger;
import org.onap.aai.cl.eelf.LoggerFactory;
public class TinkerpopTransaction extends ChampTransaction {
private static final int COMMIT_RETRY_COUNT = 3;
/** Threaded Tinkerpop transaction. */
protected Graph threadedTransaction;
private static final Logger LOGGER = LoggerFactory.getInstance().getLogger(TinkerpopTransaction.class);
protected TinkerpopTransaction() { }
/**
* Creates a new transaction instance.
*
* @param aGraphInstance - Instance of the graph to request the transaction from.
*/
public TinkerpopTransaction(Graph aGraphInstance) {
super();
if(!aGraphInstance.features().graph().supportsTransactions()) {
throw new UnsupportedOperationException();
}
// Request a threaded transaction object from the graph.
this.threadedTransaction = aGraphInstance.tx().createThreadedTx();
LOGGER.info(ChampCoreMsgs.CHAMPCORE_TINKERPOP_TRANSACTION_INFO,
"Open transaction - id: " + id);
}
@Override
public String id() {
return id.toString();
}
public Graph getGraphInstance() {
return threadedTransaction;
}
@Override
public void commit() throws ChampTransactionException {
LOGGER.debug("Commiting transaction - " + id);
final long initialBackoff = (int)(new SecureRandom().nextDouble() * 50);
// If something goes wrong, we will retry a couple of times before
// giving up.
for (int i = 0; i < COMMIT_RETRY_COUNT; i++) {
try {
// Do the commit.
threadedTransaction.tx().commit();
LOGGER.info(ChampCoreMsgs.CHAMPCORE_TINKERPOP_TRANSACTION_INFO,
"Committed transaction - id: " + id);
return;
} catch (Throwable e) {
LOGGER.debug("Transaction " + id + " failed to commit due to: " + e.getMessage());
// Have we used up all of our retries?
if (i == COMMIT_RETRY_COUNT - 1) {
LOGGER.error(ChampCoreMsgs.CHAMPCORE_TINKERPOP_TRANSACTION_ERROR,
"Maxed out commit attempt retries, client must handle exception and retry. " + e.getMessage());
threadedTransaction.tx().rollback();
throw new ChampTransactionException(e);
}
// Calculate how long we will wait before retrying...
final long backoff = (long) Math.pow(2, i) * initialBackoff;
LOGGER.warn(ChampCoreMsgs.CHAMPCORE_TINKERPOP_TRANSACTION_WARN,
"Caught exception while retrying transaction commit, retrying in " + backoff + " ms");
// ...and sleep before trying the commit again.
try {
Thread.sleep(backoff);
} catch (InterruptedException ie) {
LOGGER.info(ChampCoreMsgs.CHAMPCORE_TINKERPOP_TRANSACTION_INFO,
"Interrupted while backing off on transaction commit");
Thread.currentThread().interrupt();
return;
}
}
}
}
@Override
public void rollback() throws ChampTransactionException {
long initialBackoff = (int)(new SecureRandom().nextDouble() * 50);
// If something goes wrong, we will retry a couple of times before
// giving up.
for (int i = 0; i < COMMIT_RETRY_COUNT; i++) {
try {
threadedTransaction.tx().rollback();
LOGGER.info(ChampCoreMsgs.CHAMPCORE_TINKERPOP_TRANSACTION_INFO,
"Rolled back transaction - id: " + id);
return;
} catch (Throwable e) {
LOGGER.debug("Transaction " + id + " failed to roll back due to: " + e.getMessage());
// Have we used up all of our retries?
if (i == COMMIT_RETRY_COUNT - 1) {
LOGGER.error(ChampCoreMsgs.CHAMPCORE_TINKERPOP_TRANSACTION_ERROR,
"Maxed out rollback attempt retries, client must handle exception and retry. " + e.getMessage());
throw new ChampTransactionException(e);
}
// Calculate how long we will wait before retrying...
final long backoff = (long) Math.pow(2, i) * initialBackoff;
LOGGER.warn(ChampCoreMsgs.CHAMPCORE_TINKERPOP_TRANSACTION_WARN,
"Caught exception while retrying transaction roll back, retrying in " + backoff + " ms");
// ...and sleep before trying the commit again.
try {
Thread.sleep(backoff);
} catch (InterruptedException ie) {
LOGGER.info(ChampCoreMsgs.CHAMPCORE_TINKERPOP_TRANSACTION_INFO,
"Interrupted while backing off on transaction rollback");
Thread.currentThread().interrupt();
return;
}
}
}
}
}
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