Why use partitioning and key-associator key features?

Why use partitioning and key-associator key features?

What kind of application are not suitable for the use of the features key-associator and partitioning key?
Could you give me some examples?

Thank you

So the typical is to use KeyAssociation. It is a unique interface which uses a method

public Object getAssociatedKey();

I think that it works on the ClusterService level (rather than saying the Cache). For example, if you have a customer and a cache of account where a customer can have multiple accounts. Now, the customer and the account object will implement KeyAssociation and return the customer object as the AssociatedKey. This will cause these items to live on the same partition.

Now you can do some clever tricks since you know that they are on the same partition. These include the use of the BackingMap and EntryProcessors / InvocationService / aggregators to return all AccountIds associated with a customer account (essentially a join).

Unfortunately, these are enough consistency of the advanced so it is better to build first of all in a unit test and get them working before you include in your application.

Best, Andrew.

PS. You can also use the KeyPartitioningStrategy, but I prefer the KeyAssociation (like most people).

Tags: Fusion Middleware

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