The Hollywood Assumption says:
This little book opens up a new angle in software. This is one of the important attempt every developer should know. In this article, we will try to altercate it.
In believer terms, you don’t accept to bother about back your turns come. Back your turns come, they will alarm you.
But what do “you” and “they” denote here?
To explain “you” and “they” in abstruse terms, aboriginal we charge to accept how software architecture works. Back we architecture a software, we try to apparatus two things.
An API is acclimated to broadcast some methods/functions, so the caller/user of the API calls this adjustment to get some advantageous information. So, the addition does not accept any activity credibility to booty — alone alarm methods and outputs.
The framework is a little bit added analytical than the API. The framework is advancement an algorithm, but it expects the amount to be produced by the addition of the framework. To put it simply, the framework takes the action or business accomplishing from the addition and calls it back required.
With the Hollywood Principle, we can augment our action or business implementation, cogent the framework engine/implementation, which calls the fed action back required.
Spring DI: Think about Spring, area we acknowledge beans in XML, and Spring containers alarm these beans to actualize Spring beans. We inject added beans into it, abiding a absolutely configured bean. So with the advice of XML, we augment the strategy, and the Spring alembic calls them back required. We generally alarm it Dependency Injection. In fact, you ability additionally apperceive the Hollywood Assumption by addition name: IoC (Inversion of Control).
Struts 1.x: Pay absorption to the Struts 1.x implementation, area the addition of Struts extends ActionClass and provides business implementations in the Activity class. The Struts framework calls those Activity classes based on the URL mentioned in Struts config file. So here, the Activity chic is the strategy, and the Struts framework invokes it.
Observer pattern/Listener in Swing: Think about Swing’s actionListener. We subscribe to an event, like on bang on Blur, and back this accident occurs, Swing calls our cipher accounting in the actionPerformed method.
Apart from this, a servlet/EJB maintains lifecycles, so the basal server calls the adapted lifecycle adjustment back the servlet or EJB accompaniment is changed.
We alarm those methods Callback methods because the framework calls this method. We don’t accept to alarm them, but we may accommodate the implementations of those methods if we appetite to advance some strategies in the framework.
Say Cognizant has a resume upload aperture area job seekers upload their resumes. Back the aggregation does some on-campus recruiting, Cognizant will alarm them by sending an email to their inbox.
We can apparatus the aforementioned affair via the Hollywood principle. Job seekers upload their resumes in the job portal, and Cognizant sends mail to them back an on-campus accident occurs.
Cognizant says: Don’t alarm me, I will alarm you.
Let see the implementation.
Here, I accept not alien any interface for the account of simplicity, and I’ve not added any circuitous book like a priority, reset, GroupWise mail sending, etc., as I aloof capital to appearance how the Hollywood Assumption works.
Please agenda that in the CognizantJobPortal class, I advance a account area uploaded resumes are added. Back Cognizant triggers a campusing, the job portal/framework sends the mail to all job seekers who uploaded a CV to Cognizant.
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