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Merge pull request #16115 from JWThewes

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* pr/16115:
  Polish "Check for multiple processors in OnClassCondition"
  Check for multiple processors in OnClassCondition
This commit is contained in:
Stephane Nicoll 2019-03-13 18:22:20 +01:00
commit 210c51e31c
1 changed files with 17 additions and 3 deletions
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20
spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/condition/OnClassCondition.java
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@ -46,9 +46,23 @@ class OnClassCondition extends FilteringSpringBootCondition {
@Override
protected final ConditionOutcome[] getOutcomes(String[] autoConfigurationClasses,
AutoConfigurationMetadata autoConfigurationMetadata) {
// Split the work and perform half in a background thread. Using a single
// additional thread seems to offer the best performance. More threads make
// things worse
// 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) {
return resolveOutcomesThreaded(autoConfigurationClasses,
autoConfigurationMetadata);
}
else {
OutcomesResolver outcomesResolver = new StandardOutcomesResolver(
autoConfigurationClasses, 0, autoConfigurationClasses.length,
autoConfigurationMetadata, getBeanClassLoader());
return outcomesResolver.resolveOutcomes();
}
}
private ConditionOutcome[] resolveOutcomesThreaded(String[] autoConfigurationClasses,
AutoConfigurationMetadata autoConfigurationMetadata) {
int split = autoConfigurationClasses.length / 2;
OutcomesResolver firstHalfResolver = createOutcomesResolver(
autoConfigurationClasses, 0, split, autoConfigurationMetadata);