tephra-core/src/main/java/co/cask/tephra/RetryOnConflictStrategy.java

/*
 * Copyright © 2012-2014 Cask Data, Inc.
 *
 * 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.
 */

package co.cask.tephra;

/**
 * Retries transaction execution when transaction fails with {@link TransactionConflictException}.
 */
public class RetryOnConflictStrategy implements RetryStrategy {
  private final int maxRetries;
  private final long retryDelay;

  public RetryOnConflictStrategy(int maxRetries, long retryDelay) {
    this.maxRetries = maxRetries;
    this.retryDelay = retryDelay;
  }

  @Override
  public long nextRetry(TransactionFailureException reason, int failureCount) {
    if (reason instanceof TransactionConflictException) {
      return failureCount > maxRetries ? -1 : retryDelay;
    } else {
      return -1;
    }
  }
}