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Friday, 6 July 2018

Google Guice - Just-in-time Bindings



Google Guice - Just-in-time Bindings

As bindings are defined in Binding Module, Guice uses them whenever it needs to inject dependencies. In case bindings are not present, it can attempt to create just-in-time bindings. Bindings present in binding module are called explicit bindings and are of higher precedence whereas just-in-time bindings are called implicit bindings. If both type of bindings are present, explicit bindings are considered for mapping.
Following are the examples of three types of Just-in-time bindings.
Sr.No.Binding Type & Description
1Injectable Constructors
Non-private, No-argument constructors are eligible for just-in-time bindings. Another way is to annotate a constructor with @Inject annotation.
2@ImplementatedBy annotation
@ImplementatedBy annotation tells the guice about the implementation class. No binding is required in Binding Module in such a case.
3@ProvidedBy annotation
@ProvidedBy annotation tells the guice about the provider of implementation class. No binding is required in Binding Module in such a case.

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