Inject Generic Implementation using Guice

Inject Generic Implementation using Guice

Guice is a lightweight dependency injection framework for Java. To inject a generic implementation using Guice, you can use the bind() method to specify the binding of the generic interface to its implementation. Here's a step-by-step guide on how to do this:

Suppose you have a generic interface and its implementation as follows:

// Generic interface public interface MyGenericService<T> { void performAction(T data); } // Generic implementation public class MyGenericServiceImpl<T> implements MyGenericService<T> { @Override public void performAction(T data) { System.out.println("Performing action with data: " + data); } }

Now, let's use Guice to inject this generic implementation:

  • Create a Guice module that binds the generic interface to its implementation. You can do this by extending the AbstractModule class:
import com.google.inject.AbstractModule; public class MyModule extends AbstractModule { @Override protected void configure() { // Bind the generic interface to its implementation bind(new TypeLiteral<MyGenericService<String>>(){}).to(MyGenericServiceImpl.class); } }

In this example, we are binding the generic interface MyGenericService<String> to the implementation MyGenericServiceImpl.

  • Create a Guice injector and use it to get an instance of your generic service:
import com.google.inject.Guice; import com.google.inject.Injector; public class Main { public static void main(String[] args) { // Create a Guice injector with your module Injector injector = Guice.createInjector(new MyModule()); // Get an instance of your generic service MyGenericService<String> service = injector.getInstance(new Key<MyGenericService<String>>(){}); // Use the service service.performAction("Hello, Guice!"); } }

In this example, we create a Guice injector with the MyModule, and then we use the injector.getInstance() method to obtain an instance of the generic service. The key specifies the generic type parameter (MyGenericService<String> in this case).

  • Run your application, and Guice will handle the injection of the generic service implementation.

This example demonstrates how to inject a generic implementation using Guice. You can customize the generic type parameter as needed based on your requirements.

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