[infinispan-issues] [JBoss JIRA] Created: (ISPN-881) A listener which receives CacheEntryCreatedEvent + CacheEntryModifiedEvent events always has a null value after a Cache.put while a Cache.put which replaces delivers the actual value.

[Miroslav Pokorny (JIRA)]

A listener which receives CacheEntryCreatedEvent + CacheEntryModifiedEvent events always has a null value after a Cache.put while a Cache.put which replaces delivers the actual value.
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                 Key: ISPN-881
                 URL: https://issues.jboss.org/browse/ISPN-881
             Project: Infinispan
          Issue Type: Bug
          Components: Listeners
    Affects Versions: 4.2.0.CR3
         Environment: N/A
            Reporter: Miroslav Pokorny
            Assignee: Manik Surtani


It would be advantageous if the beheaviour of the delivered modify events did not deliver null values after a put which is different from a put which replaces which does deliver the actual value. It is also not possible to take the key from the create event and try and read the cache. I have tried printing both when the Event.isPre() field is false and true and the value is null.

Please examine the provided test harness which includes some prints the output which demonstrates the problem...

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package miroslav.pokorny.cache.infinispan;

import org.infinispan.manager.DefaultCacheManager;
import org.infinispan.manager.EmbeddedCacheManager;
import org.infinispan.notifications.Listener;
import org.infinispan.notifications.cachelistener.annotation.CacheEntryCreated;
import org.infinispan.notifications.cachelistener.annotation.CacheEntryModified;
import org.infinispan.notifications.cachelistener.event.CacheEntryCreatedEvent;
import org.infinispan.notifications.cachelistener.event.CacheEntryModifiedEvent;

public class InfinispanValueProblemTest {

    private final static String KEY = "key";
    private final static String VALUE = "*Value*";

    static public void main(final String[] ignored) {
        final EmbeddedCacheManager manager = new DefaultCacheManager();
        final org.infinispan.Cache<String, String> cache = manager.getCache();
        cache.addListener(new InfinispanCacheListener());

        cache.put(KEY, VALUE);
    }

    @Listener
    static final public class InfinispanCacheListener {

        @CacheEntryCreated
        public void entryCreated(final CacheEntryCreatedEvent<String, String> event) {
            System.out.println("CREATE EVENT\n\t" + event.getKey() + "= cant do get value\n\tisPre=" + event.isPre()
                    + "\n\tevent.getCache().get(event.getKey())=" + event.getCache().get(event.getKey()));
        }

        @CacheEntryModified
        public void entryModified(final CacheEntryModifiedEvent<String, String> event) {
            System.out.println("MODIFIED EVENT\n\t" + event.getKey() + "=" + event.getValue() + "\n\tisPre=" + event.isPre()
                    + "\n\tevent.getCache().get(event.getKey())=" + event.getCache().get(event.getKey()));
        }
    }
}


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Running the test should print something like this

[       GlobalComponentRegistry] - Infinispan version: Infinispan 'Ursus' 4.2.0.CR3
[             ComponentRegistry] - Infinispan version: Infinispan 'Ursus' 4.2.0.CR3
CREATE EVENT
	key= cant do get value
	isPre=true
	event.getCache().get(event.getKey())=null
CREATE EVENT
	key= cant do get value
	isPre=false
	event.getCache().get(event.getKey())=null
MODIFIED EVENT
	key=null
	isPre=true
	event.getCache().get(event.getKey())=null
MODIFIED EVENT
	key=*Value*
	isPre=false
	event.getCache().get(event.getKey())=null


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