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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.messagebus.routing;
import com.yahoo.messagebus.ErrorCode;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
/**
* Implements a retry policy that allows resending of any error that is not fatal. It also does progressive back-off,
* delaying each attempt by the given time multiplied by the retry attempt.
*
* @author Simon Thoresen Hult
*/
public class RetryTransientErrorsPolicy implements RetryPolicy {
private static final double US = 1000000;
private final AtomicBoolean enabled = new AtomicBoolean(true);
private volatile AtomicLong baseDelayUS = new AtomicLong(1000);
/**
* Sets whether or not this policy should allow retries or not.
*
* @param enabled True to allow retries.
* @return This, to allow chaining.
*/
public RetryTransientErrorsPolicy setEnabled(boolean enabled) {
this.enabled.set(enabled);
return this;
}
/**
* Sets the base delay in seconds to wait between retries. This amount is multiplied by the retry number.
*
* @param baseDelay The time in seconds.
* @return This, to allow chaining.
*/
public RetryTransientErrorsPolicy setBaseDelay(double baseDelay) {
this.baseDelayUS.set((long)(baseDelay*US));
return this;
}
@Override
public boolean canRetry(int errorCode) {
return enabled.get() && errorCode < ErrorCode.FATAL_ERROR;
}
@Override
public double getRetryDelay(int retry) {
long retryMultiplier = 0l;
if (retry > 1) {
retryMultiplier = 1L << Math.min(20, retry-1);
}
return Math.min(10.0, (retryMultiplier*baseDelayUS.get())/US);
}
}
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