/*
* Druid - a distributed column store.
* Copyright (C) 2012, 2013 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 io.druid.indexing.common;
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 maxNumRetries;
private final Duration maxRetryDelay;
private volatile Duration currRetryDelay;
private volatile int retryCount;
public RetryPolicy(RetryPolicyConfig config)
{
this.maxNumRetries = config.getMaxRetryCount();
this.maxRetryDelay = config.getMaxWait().toStandardDuration();
this.currRetryDelay = config.getMinWait().toStandardDuration();
this.retryCount = 0;
}
public Duration getAndIncrementRetryDelay()
{
if (hasExceededRetryThreshold()) {
return null;
}
Duration retVal = currRetryDelay;
currRetryDelay = new Duration(Math.min(currRetryDelay.getMillis() * 2, maxRetryDelay.getMillis()));
++retryCount;
return retVal;
}
public boolean hasExceededRetryThreshold()
{
return retryCount >= maxNumRetries;
}
}