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https://issues.apache.org/jira/browse/AMQ-6062 

Updated QueueBrowserSubscription to use a ConcurrentMap to avoid a
potential race condition when multiple queue browsers browse
multiple queues.

(cherry picked from commit d346a765e3)
This commit is contained in:
Christopher L. Shannon (cshannon) 2015-12-02 15:51:55 +00:00
parent bbb002afda
commit 58359a85d8
1 changed files with 4 additions and 10 deletions
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14
activemq-broker/src/main/java/org/apache/activemq/broker/region/QueueBrowserSubscription.java
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@ -18,9 +18,9 @@ package org.apache.activemq.broker.region;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import javax.jms.JMSException;
@ -42,7 +42,7 @@ public class QueueBrowserSubscription extends QueueSubscription {
boolean browseDone;
boolean destinationsAdded;
private final Map<MessageId, Object> audit = new HashMap<MessageId, Object>();
private final ConcurrentMap<MessageId, Object> audit = new ConcurrentHashMap<MessageId, Object>();
private long maxMessages;
public QueueBrowserSubscription(Broker broker, SystemUsage usageManager, ConnectionContext context, ConsumerInfo info) throws JMSException {
@ -67,13 +67,7 @@ public class QueueBrowserSubscription extends QueueSubscription {
}
public boolean isDuplicate(MessageId messageId) {
if (!audit.containsKey(messageId)) {
audit.put(messageId, Boolean.TRUE);
return false;
}
return true;
return audit.putIfAbsent(messageId, Boolean.TRUE) != null;
}
private void checkDone() throws Exception {