nl.topicus.jdbc.shaded.com.google.api.gax.retrying.TimedRetryAlgorithm Maven / Gradle / Ivy

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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package nl.topicus.jdbc.shaded.com.google.api.gax.retrying;

import java.util.concurrent.CancellationException;

/**
 * A timed retry algorithm is responsible for the following operations, based on the previous
 * attempt settings and current time:
 *
 * 
 *   Creating first attempt {@link TimedAttemptSettings}.
 *   
Accepting a task for retry so another attempt will be made.
 *   
Canceling retrying process so the related {@link java.util.concurrent.Future} will be
 *       canceled.
 *   
Creating {@link TimedAttemptSettings} for each subsequent retry attempt.
 * 
 *
 * Implementations of this interface must be be thread-save.
 */
public interface TimedRetryAlgorithm {

  /**
   * Creates a first attempt {@link TimedAttemptSettings}.
   *
   * @return first attempt settings
   */
  TimedAttemptSettings createFirstAttempt();

  /**
   * Creates a next attempt {@link TimedAttemptSettings}, which defines properties of the next
   * attempt.
   *
   * @param prevSettings previous attempt settings
   * @return next attempt settings or {@code null} if the implementing algorithm does not provide
   *     specific settings for the next attempt
   */
  TimedAttemptSettings createNextAttempt(TimedAttemptSettings prevSettings);

  /**
   * Returns {@code true} if another attempt should be made, or {@code false} otherwise.
   *
   * @param nextAttemptSettings attempt settings, which will be used for the next attempt, if
   *     accepted
   * @throws CancellationException if the retrying process should be canceled
   */
  boolean shouldRetry(TimedAttemptSettings nextAttemptSettings) throws CancellationException;
}