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Is there a way to have guice call a init() method after it has instantiated a singleton? Calling init() inside the constructor is not an option since init() could be overriden by a subclass.
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问题:
回答1:
You can use `@PostConstruct' in guice when you use the mycila/jsr250 extension. This will cause your init() method to be called right after instantiation.
@PostConstruct void init() { // ... } If you do not can/want to add 3rd party libs for this, I wrote a simple postconstruct module for this as well a while ago:
public enum PostConstructModule implements Module, TypeListener { INSTANCE; @Override public void configure(final Binder binder) { // all instantiations will run through this typeListener binder.bindListener(Matchers.any(), this); } /** * Call postconstruct method (if annotation exists). */ @Override public <I> void hear(final TypeLiteral<I> type, final TypeEncounter<I> encounter) { encounter.register(new InjectionListener<I>() { @Override public void afterInjection(final I injectee) { for (final Method postConstructMethod : filter(asList(injectee.getClass().getMethods()), MethodPredicate.VALID_POSTCONSTRUCT)) { try { postConstructMethod.invoke(injectee); } catch (final Exception e) { throw new RuntimeException(format("@PostConstruct %s", postConstructMethod), e); } } } }); } } 回答2:
You can annotate a method in your module with @Inject and then request injection on the module:
class MyModule extends AbstractModule { @Override public void configure() { requestInjection(this); } @Inject void initMyClass(MyClass instance) { instance.init(); } }