Guice does not provide a way to bind conditionally. Any decission which is made at runtime must happen in your code.
The only thing which I can think of that might help in this kind of situation are multibindings. Basically multibindings allow to bind many implementations of an interface. All binded implementations can then be injected as a set or map. Your could could then iterate over all implementations and select the correct one for the current input.
https://github.com/google/guice/wiki/Multibindings
Am 23.08.2014 11:52 schrieb Rudolf Visagie <[email protected]>:
-- --I have the following scenario:
SomeData getSomeData()
}
@LegacyServiceClientAdapter
public class MyLegacyServiceClientAdapterImpl implements ServiceClientAdapter {
public SomeData getSomeData() {
// implementation
}
}
@NewServiceClientAdapter
public class MyNewServiceClientAdapterImpl implements ServiceClientAdapter {
public SomeData getSomeData() {
// implementation
}
}
public class BusinessLogic {
@Inject
private ServiceClientAdapter serviceClientAdapter;
}LegacyServiceClientAdapter and NewServiceClientAdapter are custom annotations.The implementation for the serviceClientAdapter field will be determined at runtime by whether the user has been migrated from the legacy to the new service or not.What is the best way to accomplish this dependency injection using Google Guice?Take into account that different BusinessLogic classes will exist, each with their own (different) ServiceClientAdapter-like interface and corresponding legacy and new implementation classes.Ideally this should be done with a piece of framework code that can be used across all use cases.
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