CODEWITHSUNDEEP
javaspring
Mr. Will
Mr. Will

Reputation: 2308

Multiple Bean Configurations of a Class

I have 2 beans configured for a class so that I can configure the class with two different data layer implementations. What I'm wondering is if there is a pattern or best practice for selecting between the two different beans in my code. I know without Spring, the Factory pattern would be commonly used for this, but it seems a bit redundant being as beans are retrieved from Spring via a factory.

Upvotes: 0

Views: 2208

Answers (2)

Ryan Stewart
Ryan Stewart

Reputation: 128829

There's no problem having a Factory within a Factory. It happens all the time in Spring, in fact. I'd say that sounds like a good approach here. Your data storage factory would be a Spring bean and be injected with the two different implementations, which are also beans. The job of the factory is to choose between them based on some input.

Upvotes: 1

Tomasz Nurkiewicz
Tomasz Nurkiewicz

Reputation: 340733

Declare both beans and mark one as primary. You can either use:

<bean primary="true" ...

in XML configuration or:

@Primary
@Bean

In @Configuration approach. Spring will prefer primary beans when performing autowiring. Reference documentation.

Upvotes: 0

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