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Avoid resizing of fixed-size HashSet/LinkedHashSet variants

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Add helpers to CollectionUtils for building HashSets and LinkedHashSets
that can hold an expected number of elements without needing to
resize/rehash.

Closes gh-32291
This commit is contained in:
Patrick Strawderman
2024-02-18 14:05:31 -08:00
committed by Sam Brannen
parent 6383a0d7ca
commit e1a32d4ba9
47 changed files with 114 additions and 75 deletions
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2
spring-messaging/src/main/java/org/springframework/messaging/handler/DestinationPatternsMessageCondition.java
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@@ -86,7 +86,7 @@ public class DestinationPatternsMessageCondition
private static Set<String> prependLeadingSlash(String[] patterns, RouteMatcher routeMatcher) {
boolean slashSeparator = routeMatcher.combine("a", "a").equals("a/a");
Set<String> result = new LinkedHashSet<>(patterns.length);
Set<String> result = CollectionUtils.newLinkedHashSet(patterns.length);
for (String pattern : patterns) {
if (slashSeparator && StringUtils.hasLength(pattern) && !pattern.startsWith("/")) {
pattern = "/" + pattern;

3
spring-messaging/src/main/java/org/springframework/messaging/simp/user/DefaultUserDestinationResolver.java
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@@ -30,6 +30,7 @@ import org.springframework.messaging.simp.SimpLogging;
import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
import org.springframework.messaging.simp.SimpMessageType;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;
/**
@@ -216,7 +217,7 @@ public class DefaultUserDestinationResolver implements UserDestinationResolver {
}
else {
Set<SimpSession> sessions = user.getSessions();
sessionIds = new HashSet<>(sessions.size());
sessionIds = CollectionUtils.newHashSet(sessions.size());
for (SimpSession session : sessions) {
sessionIds.add(session.getId());
}

2
spring-messaging/src/main/java/org/springframework/messaging/simp/user/MultiServerUserRegistry.java
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@@ -414,7 +414,7 @@ public class MultiServerUserRegistry implements SimpUserRegistry, SmartApplicati
this.id = session.getId();
this.user = new TransferSimpUser();
Set<SimpSubscription> subscriptions = session.getSubscriptions();
this.subscriptions = new HashSet<>(subscriptions.size());
this.subscriptions = CollectionUtils.newHashSet(subscriptions.size());
for (SimpSubscription subscription : subscriptions) {
this.subscriptions.add(new TransferSimpSubscription(subscription));
}