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A driver for DataStax Enterprise (DSE) and Apache Cassandra 1.2+ clusters that works exclusively with the Cassandra Query Language version 3 (CQL3) and Cassandra's binary protocol, supporting DSE-specific features such as geospatial types, DSE Graph and DSE authentication.

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/*
 * Copyright DataStax, Inc.
 *
 * This software can be used solely with DataStax Enterprise. Please consult the license at
 * http://www.datastax.com/terms/datastax-dse-driver-license-terms
 */
package com.datastax.driver.dse;

import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Statement;
import com.datastax.driver.core.policies.RetryPolicy;
import java.util.concurrent.atomic.AtomicBoolean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Add warnings to the parent policy.
 *
 * 
 *
 * @deprecated As of release 1.1.0, dse driver now depends on driver-core 3.1.0, which doesn't retry
 *     non-idempotent statements for write timeouts or unexpected errors anymore.
 */
@SuppressWarnings("deprecation")
@Deprecated
public class LoggingIdempotenceAwareRetryPolicy
    extends com.datastax.driver.core.policies.IdempotenceAwareRetryPolicy {

  private static final Logger logger =
      LoggerFactory.getLogger(LoggingIdempotenceAwareRetryPolicy.class);

  private final AtomicBoolean warned = new AtomicBoolean();

  /**
   * Creates a new instance.
   *
   * @param childPolicy the policy to wrap.
   */
  public LoggingIdempotenceAwareRetryPolicy(RetryPolicy childPolicy) {
    super(childPolicy);
  }

  @Override
  public void init(Cluster cluster) {
    super.init(cluster);
    warn("Initializing cluster with idempotence-aware retry policy");
  }

  @Override
  protected boolean isIdempotent(Statement statement) {
    boolean isIdempotent = super.isIdempotent(statement);
    if (warned.compareAndSet(false, true) && !isIdempotent)
      warn(
          "Not retrying statement because it is not idempotent (this message will be logged only once)");
    return isIdempotent;
  }

  private void warn(String message) {
    logger.warn(
        "{}. Note that this version of the driver changes the default retry behavior for non-idempotent "
            + "statements: they won't be automatically retried anymore. The driver marks statements non-idempotent "
            + "by default, so you should explicitly call setIdempotent(true) if your statements are safe to retry. "
            + "See http://goo.gl/4HrSby for more details.",
        message);
  }
}