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Java 9 Dependency Injection
book

Java 9 Dependency Injection

by Nilang Patel, Krunal Patel
April 2018
Intermediate to advanced content levelIntermediate to advanced
246 pages
6h 11m
English
Packt Publishing
Content preview from Java 9 Dependency Injection

@Named

Making unused annotation types for each concrete usage doesn’t provide much value, as the sole reason for having such an annotation is to check the implementation class instance required by clients. To support such things, we have a built-in binding annotation called @Named, which takes a string. There's the method Names.named(), which returns @Named annotation when passing names as arguments:

bind(NotificationService.class).annotatedWith(Names.named("SMS"))          .to(SMSService.class);

We suggest utilizing @Named sparingly, because the compiler cannot check the string.

@Singleton is another useful annotation which we will discuss in detail in Chapter 5, Scopes.

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Publisher Resources

ISBN: 9781788296250Supplemental Content