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Google Guice (pronounced like "juice") is an open-source software framework for the Java platform developed by Bob Lee and Kevin Bourrillion at Google and released under the Apache License. It provides support for dependency injection using annotations to configure Java objects.
Google Guice is an open-source software framework for the Java platform developed by Bob Lee and Kevin Bourrillion at Google and released under the Apache License. It provides support for dependency injection using annotations to configure Java objects.
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What is Guice in dependency injection?
Nov 29, 2021 · Guice is a framework that makes it possible to write code that uses dependency injection without the hassle of writing much of that boilerplate code, as further detailed in this page on Motivation. Put simply, Guice alleviates the need for factories and the use of new in your Java code.
- Introduction
- Setup
- Basic Dependency Injection with Guice
- Types of Dependency Injection
- Scoping in Guice
- Aspect-Oriented Programming in Guice
- Conclusion
In this tutorial, we’ll examinethe fundamentals of Google Guice. Then we’ll look at some approaches to completing basic Dependency Injection (DI) tasks in Guice. We’ll also compare and contrast the Guice approach to those of more established DI frameworks, like Spring and Contexts and Dependency Injection (CDI). This tutorial presumes the reader ha...
In order to use Google Guice in our Maven project, we’ll need to add the following dependency to our pom.xml: There’s also a collection of Guice extensions (we’ll cover those a little later) here, as well as third-party modules to extend the capabilities of Guice (mainly by providing integration to more established Java frameworks).
3.1. Our Sample Application
We’ll be working with a scenario where we design classes that support three means of communication in a helpdesk business: Email, SMS, and IM. Firstly, let’s consider the class: This Communication class is the basic unit of communication. An instance of this class is used to send messages via the available communications channels. As shown above, Communication has a Communicator,which we’ll use to do the actual message transmission. The basic entry point into Guice is the Injector: This main...
3.2. Guice Basic Bindings
Binding is to Guice as wiring is to Spring. With bindings, we define how Guice is going to inject dependenciesinto a class. A binding is defined in an implementation ofcom.google.inject.AbstractModule: This module implementation specifies that an instance of DefaultCommunicatorImpl is to be injected wherever a Communicatorvariable is found.
3.3. Named Binding
Another incarnation of this mechanism is the named binding. Consider the following variable declaration: For this, we’ll have the following binding definition: This binding will provide an instance ofCommunicator to a variable annotated with the @Named(“DefaultCommunicator”) annotation. We can also see that the @Inject and @Named annotations appear to be loan annotations from Jakarta EE’s CDI, and they are. They’re in the com.google.inject.* package, and we should be careful to import from th...
Guice also supports the standard types of injections we’ve come to expect with the DI pattern. In the Communicator class, we need to inject different types of CommunicationMode.
Guice supports the scopes and scoping mechanisms we’ve grown used to in other DI frameworks. Guice defaults to providing a new instance of a defined dependency.
Guice is compliant with the AOPAlliance’s specifications for aspect-oriented programming. We can implement the quintessential logging interceptor, which we’ll use to track message sending in our example in only four steps. Step 1 – Implement the AOPAlliance’s MethodInterceptor: Step 2 – Define a Plain Java Annotation: Step 3 – Define a Binding for ...
Having looked at basic Guice functionality, we can see where the inspiration for Guice came from Spring. Along with its support for JSR-330, Guice aims to be an injection-focused DI framework (whereas Spring provides a whole ecosystem for programming convenience, not necessarily just DI) targeted at developers who want DI flexibility. Guice is also...
Beyond Dependency Injection, the benefits of using Google Guice is: Guice has a very clean implementation of constructor Injection. As you can see from the example you just add @Inject annotation constructor. Guice also has setter Injection using the same annotation. Having said that, the annotation based Injection is very clean approach ...
Code sample
public class B {private A a;@Injectpublic B(A a) {this.a = a;...Oct 30, 2018 · So you will need to have a working JDK to be able to run Java code in your computer. To check if it’s already installed, run ‘java -version’ on the command line. If the version is 1.6 or greater, we are good. Just a note: I don’t think it would make much sense to attempt this if you don’t have experience with Java.
Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 11 and above, brought to you by Google. - google/guice
