Limit visibility of Bindings to Package and Subpackage

[MrIcehawk]

Hello,

I am using Guice 3.0 to develop an Application that consists of several packages.

I would like to have Bindings which are only visible in one package and its subpackages. 

I have one Module per Package where I configure the Bindings used in that package.

Currently I the Module in the root package installs the Modules in its subpackages, which then install the Modules in their subpackages and so on.

That means if I have the following packages:

Application

Application.ComponentA

Application.ComponentB

Application.ComponentB.SubcomponentC

I would have the following Modules:

Application.ApplicationModule

Application.ComponentA.AModule

Application.ComponentB.BModule

Application.ComponentB.SubcomponentC.CModule

The ApplicationModule would look like:

public class ApplicationModule extends AbstractModule{

@Override

protected void configure() {

                   install(new AModule());

                   install(new BModule());

                   // Configure some Bindings

        }

}

And I would create one Injector in the Main Method using:

Guice.createInjector(new MainModule());

Objects are created using Constructor and Method injection, injecting Providers if needed. 

However, if BModule maps List<String> to ArrayList<String> then AModule also sees that Binding. Also if AModule tries to bind List<String> to LinkedList<String> I will get a conflict.
I would like to have a binding configured in BModule to be only visible within ComponentB and SubcomponentC. Such that a class which requests a List<String> gets a LinkedList if its in ComponentA, a ArrayList if its in B or C and an error if its somewhere else.

The reason is, that I would like packages on the same level to be independent and only depend on their ancestors.

I have seen that Guice features child-injectors and PrivateModule, but I am unsure if/how I could use that to achieve my goal.

Thanks in advance,

Martin Haug

[nino martinez wael]

use a childinjector with private modules for this

Application.ApplicationModule <--- parent injector
Application.ComponentA.AModule <-- ChildA (private module)
Application.ComponentB.BModule <-- ChildB (private module)
Application.ComponentB.SubcomponentC.CModule <--ChildB (Installed from BModule?)

2014-11-20 10:36 GMT+01:00 'MrIcehawk' via google-guice
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--
Best regards / Med venlig hilsen
Nino Martinez