content: /*
   * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
   * (the "License"). You may not use this work except in compliance with the License, which is
   * available at www.apache.org/licenses/LICENSE-2.0
   *
   * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied, as more fully set forth in the License.
   *
   * See the NOTICE file distributed with this work for information regarding copyright ownership.
   */
  
  package alluxio.retry;
  
  import com.google.common.base.Preconditions;
  
  import javax.annotation.concurrent.NotThreadSafe;
  
  /**
   * An option which allows retrying based on maximum count.
   */
  @NotThreadSafe
  public class CountingRetry implements RetryPolicy {
  
    private final int mMaxRetries;
    private int mAttemptCount = 0;
  
    /**
     * Constructs a retry facility which allows max number of retries.
     *
     * @param maxRetries max number of retries
     */
    public CountingRetry(int maxRetries) {
      Preconditions.checkArgument(maxRetries >= 0, "Max retries must be a non-negative number");
      mMaxRetries = maxRetries;
    }
  
    @Override
    public int getAttemptCount() {
      return mAttemptCount;
    }
  
    @Override
    public boolean attempt() {
      if (mAttemptCount <= mMaxRetries) {
        mAttemptCount++;
        return true;
      }
      return false;
    }
  
    /**
     * Reset the count of retries.
     */
    public void reset() {
      mAttemptCount = 0;
    }
  
    @Override
    public RetryPolicy copy() {
      return new CountingRetry(mMaxRetries);
    }
  }
  