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94 lines (82 loc) · 2.66 KB
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/*
* Copyright 2013 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package feign;
import static java.util.concurrent.TimeUnit.SECONDS;
/**
* Created for each invocation to {@link Client#execute(Request, feign.Request.Options)}.
* Implementations may keep state to determine if retry operations should
* continue or not.
*/
public interface Retryer {
/**
* if retry is permitted, return (possibly after sleeping). Otherwise
* propagate the exception.
*/
void continueOrPropagate(RetryableException e);
public static class Default implements Retryer {
private final int maxAttempts;
private final long period;
private final long maxPeriod;
// visible for testing;
protected long currentTimeMillis() {
return System.currentTimeMillis();
}
int attempt;
long sleptForMillis;
public Default() {
this(100, SECONDS.toMillis(1), 5);
}
public Default(long period, long maxPeriod, int maxAttempts) {
this.period = period;
this.maxPeriod = maxPeriod;
this.maxAttempts = maxAttempts;
this.attempt = 1;
}
public void continueOrPropagate(RetryableException e) {
if (attempt++ >= maxAttempts)
throw e;
long interval;
if (e.retryAfter() != null) {
interval = e.retryAfter().getTime() - currentTimeMillis();
if (interval > maxPeriod)
interval = maxPeriod;
if (interval < 0)
return;
} else {
interval = nextMaxInterval();
}
try {
Thread.sleep(interval);
} catch (InterruptedException ignored) {
Thread.currentThread().interrupt();
}
sleptForMillis += interval;
}
/**
* Calculates the time interval to a retry attempt.
* <br>
* The interval increases exponentially with each attempt, at a rate of
* nextInterval *= 1.5 (where 1.5 is the backoff factor), to the maximum
* interval.
*
* @return time in nanoseconds from now until the next attempt.
*/
long nextMaxInterval() {
long interval = (long) (period * Math.pow(1.5, attempt - 1));
return interval > maxPeriod ? maxPeriod : interval;
}
}
}