We saved binding collections for this chapter, because this is something, which requires use of Providers, we will introduce MultiBinder for binding Guice managed objects.
Let's start with a simple example, where in we need to inject objects that are not managed by Guice. Let's try to inject a Set<String> messages in FlightEngine. Define an attribute, and annotate the setter with injector.
@Inject
public void setMessages(Set<String> messages) {
this.messages = messages;
}Next, we need to write a provider for the same:
public class MessageProvider implements Provider<Set<String>> {
@Override
public Set<String> get() {
Set<String> messageSet = new HashSet<String>();
messageSet.add("Hi Client");
messageSet.add("Bye Client");
return messageSet;
}
}The provider should be bound using a TypeLiteral:
bind(new TypeLiteral<Set<String>>(){}).toProvider(MessageProvider.class).in(Singleton...