CODEWITHSUNDEEP
javaguice
zwiebl
zwiebl

Reputation: 725

Call methods from Guice module?

So I need to work on a Guice project that I inherited from a developer who worked on it earlier, and I have a specific problem to address. Let me briefly introduce the application design.

MyService.java

public static void main(String[] args) {

    Injector injector = createInjector(new MyModule());
}

MyModule.java

// ...

@Inject
@Provides
@Singleton
public Client getClient(@Named("config") String config) {
    // Client should be singleton
    return new Client(config); 
}

And now is the problem that I have to write the service operation that uses the Client which exists as a singleton somewhere in the application, but I don't know what would be the good way to obtain it. I need something like the following.

ServiceOperations.java 

// ...

public String getData() {
    // somehow obtain that client - how?
    // and then call operations on the client
    return client.getData();
}

If it wasn't Guice, I would just have a ClientFactory, and call something like ClientFactory.getClientInstance() from my getData() method and have the client reference, but with Guice, what is the proper way to obtain it?

PS. I am just learning Guice. Thanks!

Upvotes: 2

Views: 859

Answers (1)

Jameson
Jameson

Reputation: 6689

Since you already have a provider for the Client object, it should be straightforward from here:

class ServiceOperations {
    @Inject
    public ServiceOperations(Client client) {
        this.client = client;
    }

    public String getData() {
        return client.getData();
    }
}

Magical stuff, right?

Upvotes: 3

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