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1 Google Guice Introduction What is Google Guice Almighty Java
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#GoogleGuice #Google #Guice #GoogleGuice #Java • For help and support - https://www.buymeacoffee.com/almighty... • ======================== • What is Google Guice? • ======================== • Google Guice is an open source software framework for the Java platform released by Google under the Apache License. It provides support for dependency injection using annotations to configure Java objects. Dependency injection is a design pattern whose core principle is to separate behavior from dependency resolution. • Guice allows implementation classes to be bound programmatically to an interface, then injected into constructors, methods or fields using an @Inject annotation. When more than one implementation of the same interface is needed, the user can create custom annotations that identify an implementation, then use that annotation when injecting it. • ======================== • What is Module? • ======================== • A module contributes configuration information, typically interface bindings, which will be used to create an Injector. A Guice-based application is ultimately composed of little more than a set of Modules and some bootstrapping code. • Your Module classes can use a more streamlined syntax by extending AbstractModule rather than implementing this interface directly. • In addition to the bindings configured via configure, bindings will be created for all methods annotated with @Provides. Use scope and binding annotations on these methods to configure the bindings. • ======================== • Contains only one method – • Configure - Contributes bindings and other configurations for this module to the binder. • Syntax - void configure(Binder binder); • ======================== • What is Binder? • ======================== • Collects configuration information (primarily bindings) which will be used to create an Injector. Guice provides this object to your application's Module implementers so they may each contribute their own bindings and other registrations. • Guice uses an embedded domain-specific language, or EDSL, to help you create bindings simply and readable. This approach is great for overall usability, but it does come with a small cost: it is difficult to learn how to use the Binding EDSL by reading method-level java docs. • ======================== • Advantages of Google Guice • ======================== • Configuration by code no XML is required like Spring. • Guice allows the dependency injection configuration to be specified directly in Java code. • Guice can make your code more modular, easier to write, and less error-prone to maintain. • Guice objects are recognized based on their classes, This means that you cannot have two objects of the same type without using extra metadata.
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