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Return static DefaultApplicationStartup step 

This commit ensures that `DefaultApplicationStartup` returns a static
step for each call to avoid allocations.

Closes gh-26939
This commit is contained in:
Brian Clozel 2021-06-01 15:04:26 +02:00
parent e0690335fc
commit 5204d736f3
1 changed files with 5 additions and 11 deletions
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16
spring-core/src/main/java/org/springframework/core/metrics/DefaultApplicationStartup.java
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@ -1,5 +1,5 @@
/*
* Copyright 2002-2020 the original author or authors.
* Copyright 2002-2021 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.
@ -29,16 +29,16 @@ import java.util.function.Supplier;
*/
class DefaultApplicationStartup implements ApplicationStartup {
private static final DefaultStartupStep DEFAULT_STARTUP_STEP = new DefaultStartupStep();
@Override
public DefaultStartupStep start(String name) {
return new DefaultStartupStep();
return DEFAULT_STARTUP_STEP;
}
static class DefaultStartupStep implements StartupStep {
boolean recorded = false;
private final DefaultTags TAGS = new DefaultTags();
@Override
@ -63,23 +63,17 @@ class DefaultApplicationStartup implements ApplicationStartup {
@Override
public StartupStep tag(String key, String value) {
if (this.recorded) {
throw new IllegalArgumentException();
}
return this;
}
@Override
public StartupStep tag(String key, Supplier<String> value) {
if (this.recorded) {
throw new IllegalArgumentException();
}
return this;
}
@Override
public void end() {
this.recorded = true;
}