Hi Group,
Need a suggestion for how to code for multiple implementations
for a service using Google-guice. Below is the example
TestService testService =new TestServiceImplOne();
TestService testService =new TestServiceImplTwo();
As Guice doesn't allow to bind a type to more than one
implementations as the below code results in error
binderObject.bind(SomeType.class).to(ImplemenationOne.class);
binderObject.bind(SomeType.class).to(ImplemenationTwo.class);
we can solve this with named annotations as below
binder.bind(Player.class).annotatedWith(Names.named("Good")).to(GoodPlayer.class);
binder.bind(Player.class).annotatedWith(Names.named("Bad")).to(BadPlayer.class);
@Named("Good") Player goodPlayer =
(Player)injector.getInstance(Player.class);
@Named("Bad") Player badPlayer =
(Player)injector.getInstance(Player.class);
But the application which iam working is something like this
we are binding all the modules in the init() method and creating
the injector modules
//sepertae method to bind
protected void configure() {
bind(new TypeLiteral<List<Service>>() {
}).toInstance(serviceSets);
}
//seperate method to inject
Injector i = Guice.createInjector(modules); //
But with the above process I can just bind one Implementation class
to the interface(service class)
Could you please provice me a way to do this with providers. I
would like to do something like this below
class TestServiceProvider extends Provider{
/// some code where it returns the instance of impl class
needed. In my case TestServiceImplOne and TestServiceImplTwo and provider
returns the corresponding instance of service class
}
and bind service class with provider class. Something like this
bind(TestService.class).toProvider(TestServiceProvider.class);
May be iam talking something baseless , iam sorry if iam doing that
but this is my requirement, i would appreciate if someone suggest me a
good example using providers or some other way where i can inject whatever
implementation i want in the client.
*Note*: Iam using webservices and iam absolutley not sure how i can
inject different implementations when a webservice is called to a
serviceclass .
Thanks very much
Sreenivasu
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