a solution of the box? Or code change is required?

At high level, we understand what consistency is everything, now we want to start putting our hands with a CEP and see if it a real advantage for our existing J2EE applications.
Is however not clear to me yet, if it's out of the box solution or it involves our existing J2EE applications with the specific API refactoring.

Thank you

Hello

OK, in most cases, yes you need to change your application but how much change depends on how you want to use the consistency. If you just want to use it as a basic cache to avoid repeating the database calls so you can make it work with enough little changes. If you want to use features more consistency, you obviously more changes. It also really depends on how your application was built in the first place. If it's a well designed application with a good separation of concerns - that is, it has a well built the data access layer, so it's simple to connect only a layer of consistency. If the access code you DB spreads all over your application, then it will be a little more difficult.

The simplest cache would be something called cache when your application needs to read the DB side where it first checks the cache, if the data is there it is used instead of a DB call, if it is not there it is read from the DB and added to the cache. Alternatively, if your DB access code is completely free confined and easy to move you might look put this code inside the cache stores and using write through. Your application then justs reads data from or writes in a cache and consistency and then calls your cache store to do the required DB access.

Other things you should be aware of (which apply to any caching solution) are if your application is the only one who did the updates of the DB. Keep the cache and DB synchronized if other applications can update the database is something that must also be addressed. There a lot of patterns.solutions to do this, yet according to the specific use cases.

There are so many ways to do something with the consistency it is a little difficult to be very precise on what advice to give. It depends a lot on your application, how it was built and your specific use case. Do not be put off however, feel free to ask as many questions as you want, no matter how they sound newbie - what is forum.

JK

Tags: Fusion Middleware

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