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Retryer.java
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114 lines (98 loc) · 3.12 KB
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/**
* Copyright 2012-2019 The Feign Authors
*
* 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;
/**
* Cloned 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 extends Cloneable {
/**
* if retry is permitted, return (possibly after sleeping). Otherwise propagate the exception.
*/
void continueOrPropagate(RetryableException e);
Retryer clone();
class Default implements Retryer {
private final int maxAttempts;
private final long period;
private final long maxPeriod;
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;
}
// visible for testing;
protected long currentTimeMillis() {
return System.currentTimeMillis();
}
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();
throw e;
}
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;
}
@Override
public Retryer clone() {
return new Default(period, maxPeriod, maxAttempts);
}
}
/**
* Implementation that never retries request. It propagates the RetryableException.
*/
Retryer NEVER_RETRY = new Retryer() {
@Override
public void continueOrPropagate(RetryableException e) {
throw e;
}
@Override
public Retryer clone() {
return this;
}
};
}