org.camunda.bpm.engine.impl.interceptor.CrdbTransactionRetryInterceptor Maven / Gradle / Ivy
/*
* Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
* under one or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information regarding copyright
* ownership. Camunda licenses this file to you under the Apache License,
* Version 2.0; 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.camunda.bpm.engine.impl.interceptor;
import org.camunda.bpm.engine.CrdbTransactionRetryException;
import org.camunda.bpm.engine.impl.ProcessEngineLogger;
import org.camunda.bpm.engine.impl.cmd.CommandLogger;
/**
* A CockroachDB-specific Command interceptor to catch optimistic locking
* errors (classified as a {@link CrdbTransactionRetryException}). The
* interceptor then retries the Command multiple times, according to the
* retries set by the {@link org.camunda.bpm.engine.impl.cfg.ProcessEngineConfigurationImpl}
* commandRetries property.
*/
public class CrdbTransactionRetryInterceptor extends CommandInterceptor {
private static final CommandLogger LOG = ProcessEngineLogger.CMD_LOGGER;
protected int retries;
public CrdbTransactionRetryInterceptor(int retries) {
this.retries = retries;
}
@Override
public T execute(Command command) {
int remainingTries = retries + 1;
while (remainingTries > 0) {
try {
// delegate to next interceptor in chain
return next.execute(command);
} catch (CrdbTransactionRetryException e) {
remainingTries--;
if (!isRetryable(command) || remainingTries == 0) {
throw e;
} else {
LOG.crdbTransactionRetryAttempt(e);
}
}
}
return null;
}
protected boolean isRetryable(Command command) {
return command.isRetryable();
}
}