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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 (C) 2012-2017 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 org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * 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);
    }
}