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Polish "Add maxAttempts to ExponentialBackOff" 

See gh-27071
This commit is contained in:
Stephane Nicoll 2023-08-26 12:54:24 +02:00
parent f6a09f3fad
commit 609580bfb9
2 changed files with 25 additions and 22 deletions
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27
spring-core/src/main/java/org/springframework/util/backoff/ExponentialBackOff.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2002-2021 the original author or authors.
* Copyright 2002-2023 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -44,11 +44,11 @@ import org.springframework.util.Assert;
* 10 30000
* </pre>
*
* <p>Note that the default max elapsed time is {@link Long#MAX_VALUE}. Use
* {@link #setMaxElapsedTime(long)} to limit the maximum length of time
* that an instance should accumulate before returning
* {@link BackOffExecution#STOP}. Or use {@link #setMaxAttempts} to limit
* the number of attempts.
* <p>Note that the default max elapsed time and maximum number of attempts are both
* {@link Long#MAX_VALUE}. Use {@link #setMaxElapsedTime(long)} to limit the maximum
* length of time that an instance should accumulate before returning
* {@link BackOffExecution#STOP}. Alternatively, use {@link #setMaxAttempts} to limit
* the number of attempts. The execution stops when any of those two limit is reached.
*
* @author Stephane Nicoll
* @author Gary Russell
@ -161,7 +161,7 @@ public class ExponentialBackOff implements BackOff {
/**
* The maximum elapsed time in milliseconds after which a call to
* {@link BackOffExecution#nextBackOff()} returns {@link BackOffExecution#STOP}.
* @param maxElapsedTime the maxElapsedTime.
* @param maxElapsedTime the maximum elapsed time
* @see #setMaxAttempts(int)
*/
public void setMaxElapsedTime(long maxElapsedTime) {
@ -171,7 +171,7 @@ public class ExponentialBackOff implements BackOff {
/**
* Return the maximum elapsed time in milliseconds after which a call to
* {@link BackOffExecution#nextBackOff()} returns {@link BackOffExecution#STOP}.
* @return the maxElapsedTime.
* @return the maximum elapsed time
* @see #getMaxAttempts()
*/
public long getMaxElapsedTime() {
@ -181,8 +181,8 @@ public class ExponentialBackOff implements BackOff {
/**
* The maximum number of attempts after which a call to
* {@link BackOffExecution#nextBackOff()} returns {@link BackOffExecution#STOP}.
* @param maxAttempts the maxAttempts.
* @since 5.3.8
* @param maxAttempts the maximum number of attempts.
* @since 6.1
* @see #setMaxElapsedTime(long)
*/
public void setMaxAttempts(int maxAttempts) {
@ -192,8 +192,8 @@ public class ExponentialBackOff implements BackOff {
/**
* Return the maximum number of attempts after which a call to
* {@link BackOffExecution#nextBackOff()} returns {@link BackOffExecution#STOP}.
* @return the maxAttempts.
* @since 5.3.8
* @return the maximum number of attempts
* @since 6.1
* @see #getMaxElapsedTime()
*/
public int getMaxAttempts() {
@ -221,7 +221,8 @@ public class ExponentialBackOff implements BackOff {
@Override
public long nextBackOff() {
if (this.currentElapsedTime >= maxElapsedTime || this.attempts >= maxAttempts) {
if (this.currentElapsedTime >= getMaxElapsedTime()
|| this.attempts >= getMaxAttempts()) {
return STOP;
}

20
spring-core/src/test/java/org/springframework/util/ExponentialBackOffTests.java
View File

@ -1,5 +1,5 @@
/*
* Copyright 2002-2021 the original author or authors.
* Copyright 2002-2023 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -29,6 +29,8 @@ import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
/**
* Tests for {@link ExponentialBackOff}.
*
* @author Stephane Nicoll
*/
class ExponentialBackOffTests {
@ -137,15 +139,15 @@ class ExponentialBackOffTests {
@Test
void maxAttempts() {
ExponentialBackOff bo = new ExponentialBackOff();
bo.setInitialInterval(1_000L);
bo.setMultiplier(2.0);
bo.setMaxInterval(10_000L);
bo.setMaxAttempts(6);
ExponentialBackOff backOff = new ExponentialBackOff();
backOff.setInitialInterval(1000L);
backOff.setMultiplier(2.0);
backOff.setMaxInterval(10000L);
backOff.setMaxAttempts(6);
List<Long> delays = new ArrayList<>();
BackOffExecution boEx = bo.start();
IntStream.range(0, 7).forEach(i -> delays.add(boEx.nextBackOff()));
assertThat(delays).containsExactly(1_000L, 2_000L, 4_000L, 8_000L, 10_000L, 10_000L, -1L);
BackOffExecution execution = backOff.start();
IntStream.range(0, 7).forEach(i -> delays.add(execution.nextBackOff()));
assertThat(delays).containsExactly(1000L, 2000L, 4000L, 8000L, 10000L, 10000L, BackOffExecution.STOP);
}
}