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Avoid ConcurrentModificationException 

Removal of cached destination is now moved outside the for loop
that removes subscriptions to avoid ConcurrentModificationException.

Also since updateCache is a LinkedHashMap with accessOrder=true,
a simple access with updateCache.get() modify the map.
By iterating over updateCache.entrySet(), we avoid this update.

Issue: SPR-11755
pull/538/head
Sebastien Deleuze 12 years ago committed by Rossen Stoyanchev
parent
426b77b834
commit
98738c0bbb
2 changed files with 61 additions and 16 deletions
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  1. 42
      spring-messaging/src/main/java/org/springframework/messaging/simp/broker/DefaultSubscriptionRegistry.java
  2. 35
      spring-messaging/src/test/java/org/springframework/messaging/simp/broker/DefaultSubscriptionRegistryTests.java

42
spring-messaging/src/main/java/org/springframework/messaging/simp/broker/DefaultSubscriptionRegistry.java
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@ -55,7 +55,6 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry { @@ -55,7 +55,6 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry {
private PathMatcher pathMatcher = new AntPathMatcher();
/**
* Specify the maximum number of entries for the resolved destination cache.
* Default is 1024.
@ -115,7 +114,7 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry { @@ -115,7 +114,7 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry {
@Override
protected MultiValueMap<String, String> findSubscriptionsInternal(String destination, Message<?> message) {
MultiValueMap<String,String> result = this.destinationCache.getSubscriptions(destination);
MultiValueMap<String, String> result = this.destinationCache.getSubscriptions(destination);
if (result != null) {
return result;
}
@ -129,7 +128,7 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry { @@ -129,7 +128,7 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry {
}
}
}
if(!result.isEmpty()) {
if (!result.isEmpty()) {
this.destinationCache.addSubscriptions(destination, result);
}
return result;
@ -175,10 +174,11 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry { @@ -175,10 +174,11 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry {
}
public void updateAfterNewSubscription(String destination, String sessionId, String subsId) {
synchronized(this.updateCache) {
for (String cachedDestination : this.updateCache.keySet()) {
synchronized (this.updateCache) {
for (Map.Entry<String, MultiValueMap<String, String>> entry : this.updateCache.entrySet()) {
String cachedDestination = entry.getKey();
if (getPathMatcher().match(destination, cachedDestination)) {
MultiValueMap<String, String> subs = this.updateCache.get(cachedDestination);
MultiValueMap<String, String> subs = entry.getValue();
subs.add(sessionId, subsId);
this.accessCache.put(cachedDestination, new LinkedMultiValueMap<String, String>(subs));
}
@ -187,43 +187,53 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry { @@ -187,43 +187,53 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry {
}
public void updateAfterRemovedSubscription(String destination, String sessionId, String subsId) {
synchronized(this.updateCache) {
for (String cachedDestination : this.updateCache.keySet()) {
synchronized (this.updateCache) {
Set<String> destinationsToRemove = new HashSet<String>();
for (Map.Entry<String, MultiValueMap<String, String>> entry : this.updateCache.entrySet()) {
String cachedDestination = entry.getKey();
if (getPathMatcher().match(destination, cachedDestination)) {
MultiValueMap<String, String> subs = this.updateCache.get(cachedDestination);
MultiValueMap<String, String> subs = entry.getValue();
List<String> subsIds = subs.get(sessionId);
subsIds.remove(subsId);
if (subsIds.isEmpty()) {
subs.remove(sessionId);
}
if (subs.isEmpty()) {
this.updateCache.remove(cachedDestination);
this.accessCache.remove(cachedDestination);
destinationsToRemove.add(cachedDestination);
}
else {
this.accessCache.put(cachedDestination, new LinkedMultiValueMap<String, String>(subs));
}
}
}
for (String d : destinationsToRemove) {
this.updateCache.remove(d);
this.accessCache.remove(d);
}
}
}
public void updateAfterRemovedSession(SessionSubscriptionInfo info) {
synchronized(this.updateCache) {
synchronized (this.updateCache) {
for (String destination : info.getDestinations()) {
for (String cachedDestination : this.updateCache.keySet()) {
Set<String> destinationsToRemove = new HashSet<String>();
for (Map.Entry<String, MultiValueMap<String, String>> entry : this.updateCache.entrySet()) {
String cachedDestination = entry.getKey();
if (getPathMatcher().match(destination, cachedDestination)) {
MultiValueMap<String, String> subs = this.updateCache.get(cachedDestination);
MultiValueMap<String, String> subs = entry.getValue();
subs.remove(info.getSessionId());
if (subs.isEmpty()) {
this.updateCache.remove(cachedDestination);
this.accessCache.remove(cachedDestination);
destinationsToRemove.add(cachedDestination);
}
else {
this.accessCache.put(cachedDestination,new LinkedMultiValueMap<String, String>(subs));
}
}
}
for (String d : destinationsToRemove) {
this.updateCache.remove(d);
this.accessCache.remove(d);
}
}
}
}

35
spring-messaging/src/test/java/org/springframework/messaging/simp/broker/DefaultSubscriptionRegistryTests.java
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@ -185,6 +185,41 @@ public class DefaultSubscriptionRegistryTests { @@ -185,6 +185,41 @@ public class DefaultSubscriptionRegistryTests {
assertEquals(0, actual.size());
}
// SPR-11755
@Test
public void registerAndUnregisterMultipleDestinations() {
String sess1 = "sess01";
String sess2 = "sess02";
String subs1 = "subs01";
String subs2 = "subs02";
String subs3 = "subs03";
String subs4 = "subs04";
String subs5 = "subs05";
this.registry.registerSubscription(subscribeMessage(sess1, subs1, "/topic/PRICE.STOCK.NASDAQ.IBM"));
this.registry.registerSubscription(subscribeMessage(sess1, subs2, "/topic/PRICE.STOCK.NYSE.IBM"));
this.registry.registerSubscription(subscribeMessage(sess1, subs3, "/topic/PRICE.STOCK.NASDAQ.GOOG"));
this.registry.findSubscriptions(message("/topic/PRICE.STOCK.NYSE.IBM"));
this.registry.findSubscriptions(message("/topic/PRICE.STOCK.NASDAQ.GOOG"));
this.registry.findSubscriptions(message("/topic/PRICE.STOCK.NASDAQ.IBM"));
this.registry.unregisterSubscription(unsubscribeMessage(sess1, subs1));
this.registry.unregisterSubscription(unsubscribeMessage(sess1, subs2));
this.registry.unregisterSubscription(unsubscribeMessage(sess1, subs3));
this.registry.registerSubscription(subscribeMessage(sess1, subs1, "/topic/PRICE.STOCK.NASDAQ.IBM"));
this.registry.registerSubscription(subscribeMessage(sess1, subs2, "/topic/PRICE.STOCK.NYSE.IBM"));
this.registry.registerSubscription(subscribeMessage(sess1, subs3, "/topic/PRICE.STOCK.NASDAQ.GOOG"));
this.registry.registerSubscription(subscribeMessage(sess1, subs4, "/topic/PRICE.STOCK.NYSE.IBM"));
this.registry.registerSubscription(subscribeMessage(sess2, subs5, "/topic/PRICE.STOCK.NASDAQ.GOOG"));
this.registry.unregisterAllSubscriptions(sess1);
this.registry.unregisterAllSubscriptions(sess2);
}
@Test
public void registerSubscriptionWithDestinationPatternRegex() {

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