Google Guice - Singleton with param

Question

I started using google guice and trying to create an singleton object. Not sure how to pass the parameter required by getClient(...) and create an object using @Inject annotation. Any help is appreciated.

public class Client
{
    private readonly Child _child;
    public Client(Child child)
    {
        this._child = child;
    }

    static class NestedClass {
        public String propX;
        public String propY;    
    }
}

class MyHelperModule extends AbstractModule {
    private static final String propXValue = "hello";

    @Provides
    @Singleton
    private Client getClient(
        String propY) {

       Client.NestedClass nestedClass = new Client.NestedClass();
       nestedClass.propX("hello");
       nestedClass.propY(propY);

       return new Client(nestedClass);
    }
}


// helper class to create singleton object Client.  
// Need to pass param propY while creating the instance
public Client _client;

@Inject
void newClient(Client client) {
    this._client = client;
}

Thanks Srini

Answer 1

The arguments to a @Provides methods are obtained through bindings in Guice. Typically you shouldn't bind something as common as a String without a binding annotation. So something like this should let the Client be created:

@BindingAnnotation
@Retention(RUNTIME)
@interface PropX {}

// ...

bind(String.class).annotatedWith(PropX.class).toInstance("propX value");