com.metamx.druid.indexing.common.RetryPolicy.java Source code

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Here is the source code for com.metamx.druid.indexing.common.RetryPolicy.java

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/*
 * Druid - a distributed column store.
 * Copyright (C) 2012  Metamarkets Group Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package com.metamx.druid.indexing.common;

import com.metamx.druid.indexing.common.config.RetryPolicyConfig;
import com.metamx.emitter.EmittingLogger;
import org.joda.time.Duration;

/**
 */
public class RetryPolicy {
    private static final EmittingLogger log = new EmittingLogger(RetryPolicy.class);

    private final long MAX_NUM_RETRIES;
    private final Duration MAX_RETRY_DURATION;

    private volatile Duration currRetryDelay;
    private volatile int retryCount;

    public RetryPolicy(RetryPolicyConfig config) {
        this.MAX_NUM_RETRIES = config.getMaxRetryCount();
        this.MAX_RETRY_DURATION = config.getRetryMaxDuration();

        this.currRetryDelay = config.getRetryMinDuration();
        this.retryCount = 0;
    }

    public Duration getRetryDelay() {
        return currRetryDelay;
    }

    public Duration getAndIncrementRetryDelay() {
        Duration retVal = new Duration(currRetryDelay);
        currRetryDelay = new Duration(Math.min(currRetryDelay.getMillis() * 2, MAX_RETRY_DURATION.getMillis()));
        retryCount++;
        return retVal;
    }

    public int getNumRetries() {
        return retryCount;
    }

    public boolean hasExceededRetryThreshold() {
        return retryCount >= MAX_NUM_RETRIES;
    }
}