In his article, Advanced Java Content Repository API, Sunil Patil says that two of the most popular advanced functions of the JCR compliant content repository (one which is Jackrabbit) are Versioning and Observation. Since I had been taking a look at Jackrabbit already, I decided to check out these API’s a little to see if I could find some use for them.
I can easily see the Versioning API is useful for organizations who actually create their own content and would need to monitor any visible changes made to documents. The Observation API looked interesting. It gives you to join up Listeners on various predefined occasions like a Node being added or removed, and Properties being added, changed, or removed.
I got interested in it because I thought that perhaps we could use these events to trigger legacy code that didn’t depend on the repository. As before, I decided to use the JCR module from the Spring Modules Project to make integration with Spring easier. As a test, I decided to use the Observation API to snare a content update event, which would then bring about off a Lucene index revise. This content update consists of dropping the content node for this content, creating a fresh one, and re-inserting the properties back in. Finally, we connect everything with Spring settings together.
Here is the applicationContext.xml file. The first change is to register a number of EventListenerDefinition beans to the JcrSessionFactory. That is shown in the first stop above. The next stop is the configuration for the ContentUpdater simply. ADDED), and the actual mention of the EventListener bean. The fourth stop is this is and construction for the ContentUpdatedEventListener EventListener execution, which also consumes a List of IEventHandler objects. Inside our case the list contains only the reference to the dummy LuceneIndexUpdaterEventHandler class. The final stop is the bean definition for the IEventHandler.
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To run this code, I have a very simple JUnit funnel that calls the ContentUpdater.upgrade () method with a File guide. The node corresponding to the File is up to date and an event sent, and we get to visit a log message like the next in our logs. Notice that this log is usually emitted after JUnit’s messages, signifying that this is named asynchronously.
The Observation API reminds me of a middleware application which is maintained for a while at a prior job, which was a bridge between our various home-grown content management systems and our real publishing system. Events were delivered as HTTP demands and were converted into actual publishing requests by the application and sent to the posting system.
Jackrabbit’s Observation API will be a perfect easily fit into this example, and it would be so much more elegant. As I was discovering the Versioning and Observation APIs, An epiphany was had by me. I realized the reason why I have this whole love-hate thing (love the features, can’t find enough reason to implement it) with Jackrabbit is basically because it’s geared to a business model not the same as mine.
Jackrabbit (and I am speculating any CMS generally) are targeted to businesses which have a tendency to control their content in specific pieces, such as information stories in a news company or product spec sheets for processing companies, for example. Unlike them, we manage our content in bulk, regenerating all content from a content provider in batch mode. That may change in the foreseeable future, and perhaps it would be time for you to reconsider then.
Generally, the individual that have a sound understanding of the topic and it is clear thinker speaks more. This leads the learning students into thinking that whoever speaks most is successful. But just speaking for the sake of speaking shall not take you far. Q. Is motivating other folks in the group to speak looked upon favorably? A. Depends on how it is performed.
If you openly request someone to speak, you may be putting your partner in a hard spot, and the evaluators will not look that upon favorably. It is best to use other method of motivation therefore, such as agreeing with a halting speaker, adding to their points, supporting and giving them direction implicitly.