Comment #5 on issue 369 by [email protected]: Convenient way to expose
multibindings and mapbindings from PrivateModules
http://code.google.com/p/google-guice/issues/detail?id=369
Basically, I do this...
public class MyModule extends AbstractModule
{
private final String m_configurationValue;
public MyModule(String configurationValue)
{
m_configurationValue = configurationValue;
}
@Override
protected void configure()
{
MapBinder<String, MessageHandler> mapBinder =
MapBinder.newMapBinder(binder(), Foo.class, Bar.class);
// Great, I'm creating an injector in my configure...
Injector injector = Guice.createInjector(getPrivateModule());
// We could have bound this to an instance of Bar.class instead,
// but that would require remote calls in its providers be executed
// in our unit tests and that would not work correctly. This limits
// our Module unit testing.
mapBinder.addBinding(new Foo()).toProvider(
injector.getInstance(MyBarProvider.class).getProvider());
}
// This class exists just to manipulate an injector within Configure
private static class MyBarProvider {
private @Inject Provider<Bar> provider;
public Provider<Bar> getProvider() {
return provider;
}
}
private Module getPrivateModule()
{
return new PrivateModule() {
@Override
protected void configure()
{
// Bar.class depends on an A provider One, but in other
// modules depends on A provider two because of different
// implementations.
bind(A.class).toProvider(AImplProviderOne.class);
// Bar.class depends on an B provider Three, but in other
// modules depends other providers.
bind(B.class).toProvider(BImplThreeProvider.class);
// B implementations need a parameter passed into the module
// that indicate something, like initial size or file to
read
// or something.
bind(String.class).annotatedWith(BParameter.class).toInstance(configurationValue);
bind(bar.class);
expose(bar.class);
}
}
}
}
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