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Reduce started threads in OnClassCondition

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Prior to this commit, OnClassCondition started a thread even if the number of
passed autoconfiguration class candidates never exceeded 1. This commit only
starts a thread if there is actually work to split in half.

See gh-22294
This commit is contained in:
dreis2211
2020-07-09 19:04:56 +02:00
committed by Andy Wilkinson
parent 196d20537a
commit 60e7146326
1 changed files with 1 additions and 1 deletions
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spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnClassCondition.java
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@@ -49,7 +49,7 @@ class OnClassCondition extends FilteringSpringBootCondition {
// Split the work and perform half in a background thread if more than one
// processor is available. Using a single additional thread seems to offer the
// best performance. More threads make things worse.
if (Runtime.getRuntime().availableProcessors() > 1) {
if (autoConfigurationClasses.length > 1 && Runtime.getRuntime().availableProcessors() > 1) {
return resolveOutcomesThreaded(autoConfigurationClasses, autoConfigurationMetadata);
}
else {