Adding indexes with Extensible environment

#1 in the list of objectives for the Extensible environment is: "an application establishing the domain-specific cache index entry" on the page of common consistency: http://coherence.oracle.com/display/INC10/Extensible+Environments+-backgroundand + Motivation #.

However, without more information, it is somewhat misleading. Attempt to add index inside the workspace names Manager of an extensible environment leads to this error:

2012-02-07 12:46:13.251 [ERROR] consistency: 2012-02-07 12:46:13.251/9.489 OracleCoherence GE 3.6.1.0 < error > (thread = main Member, = n/a): an attempt to recursively loading and a Configuration of Cache coherence process has occurred. This is usually caused by accessing a Service (via the CacheFactory) or a NamespaceContentHandler, an ElementContentHandler or AttributeContentHandler NamedCache. Class: com. Oracle.Coherence.Environment.extensible.ExtensibleEnvironment

I don't know what approach would allow this use case for the addition of index. I think in a separate thread that sleeps for a while and add the index more later from spawning.

I like to communicate with people in consistency common to this subject to update their wiki a little, but I don't know how to get their hands on them. Anyone know?

Hello

Yes, the incubator is a little lack of documentation. You can not add indexes in the namespace manager as it is for the handling of reading in the cache configuration file and to the point that your handler is called without caches have been created - in fact factory cache is always being configured.

There are a few ways to do this, a solution to this...

First write a class EventProcessor like that...

public class CacheIndexAdder implements EventProcessor {

    @Override
    public void process(EventDispatcher eventDispatcher, NamedCacheStorageRealizedEvent event) {
        ExecutorService executorService = eventDispatcher.getEnvironment().getResource(ExecutorService.class);
        executorService.submit(new IndexJob(eventDispatcher, event));
    }

    private static class IndexJob implements Runnable {

        private EventDispatcher eventDispatcher;
        private NamedCacheStorageRealizedEvent event;

        private IndexWrapJob(EventDispatcher eventDispatcher, NamedCacheStorageRealizedEvent event) {
            this.eventDispatcher = eventDispatcher;
            this.event = event;
        }

        @Override
        public void run() {
            ConfigurableCacheFactory cacheFactory = (ConfigurableCacheFactory)eventDispatcher.getEnvironment();
            String cacheName = event.getCacheName();
            NamedCache cache = cacheFactory.ensureCache(cacheName, null);

            // Add the indexes to the cache...

        }
    }
}

Then a namespace like this Manager...

public class IndexAdderContentHandler implements ElementContentHandler {

    @Override
    public Object onElement(ConfigurationContext configurationContext, QualifiedName qualifiedName, XmlElement xmlElement) throws ConfigurationException {
        EventDispatcher eventDispatcher = configurationContext.getEnvironment().getResource(EventDispatcher.class);
        eventDispatcher.registerEventProcessor(NamedCacheStorageRealizedEventFilter.INSTANCE, new CacheIndexAdder());
        return null;
    }

}

Then, in your configuration just put the XML element that you have registered the namespace handler. Of course, you can add more element XML configuration to configure the Adder to index in the onElement method.

What is happening now is that when the configuration is read that your IndexAdderContentHandler is called whenever the relevant XML element is encountered and saves the EventProcessor CacheIndexAdder with the EventDispatcher. Every time that a cache is created the CacheIndexAdder then gets and callback method to process event. The CacheIndexAdder uses the ExecutorService environment to actually make the index adding on another Thread that we do not want delay event processing in the EventDispatcher.

Tags: Fusion Middleware

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-----------------------------------------------------------------------------------------

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---------------------------------------------------

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Name of Type Null

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------------------------------------------------------------------------------------

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Published by: user12088323 on December 28, 2010 12:45

Published by: user12088323 on December 28, 2010 12:47
user12088323 wrote:
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2004-07-14

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abc


16:13:03Z



');

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O
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abc


16:13:03Z



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