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Java Blog für Programmierer

Guice 3.0 ist raus

· Christian Ullenboom

Nach laaaanger Wartezeit ist DI-Framework Guice 3.0 veröffentlicht worden. Von die Neuerungen:

  • JSR 330 support
  • New Persist extension
  • ToConstructor Bindings
  • Better OSGi support (and generally improved support for multiple classloaders)
  • New methods in Binder: requireExplicitBindings & disableCircularProxies
  • Much simpler stack traces when AOP is involved
  • Exact duplicate bindings are ignored (instead of an exception being thrown)
  • Repackaged cglib, asm & guava classes are now hidden from IDE auto-imports
  • Source can be built with Maven
  • General extension & SPI improvements:
  • Scope improvements:
    • Scopes.isSingleton
    • toInstance bindings are considered eager singletons in the Scope SPI
    • Singleton providers that return null are now scoped properly.
    • Fail when circularly dependent singletons cannot be proxied (previously two instances may have been created)
  • Provider Method (@Provides) improvements:
    • Logger dependencies now use named instead of anonymous loggers
    • Exceptions produce a simpler stack
  • Private Modules improvements:
    • If a single PrivateModule is passed to Modules.override, private elements can be overridden.
    • If many modules are passed to Modules.override, exposed keys can be overridden.
  • Multibinder & MapBinder extension improvements:
    • permitDuplicates — allows MapBinder to inject a Map<K, Set<V>> and a Map<K, Set<Provider<V>> and Multibinder to silently ignore duplicate entries
    • Expose dependencies in Stage.TOOL, and return a dependency on Injector (instead of null) when working with Elements.
    • Co-exist nicely with Modules.override
    • Work properly with marker (parameterless) annotations
    • Expose details through the new extensions SPI
  • Servlet extension improvements:
    • Added with(instance) for servlet bindings.
    • Support multiple injectors using ServletModule in the same JVM.
    • Support thread-continuations (allow background threads to process an HttpRequest)
    • Support manually seeding a @RequestScope
    • Expose details through new extensions SPI
    • Fix request forwarding
    • Performance improvements for the filter & servlet pipelines
    • Expose the servlet context (ServletModule.getServletContext)
    • Fixed so a single ServletModule instance can be used twice (in, say Element.getElements & creating an Injector)
    • Fix to work with context paths
  • AssistedInject extension improvements
    • New FactoryModuleBuilder for building assisted factories
    • Injection is done through child injectors and can participate in AOP
    • Performance improvements
    • Multiple different implementations can be created from a single factory
    • Incorrect implementations or factories are detected in Stage.TOOL, and more error-checking with better error messages
    • Work better with parameterized types
    • Expose details through new extensions SPI
  • ThrowingProviders extension improvements
    • Added a new CheckedProviders interface that allows more than one exception to be thrown.
    • Added @CheckedProvides allowing @Provides-like syntax for CheckedProviders.
    • Dependencies are checked at Injector-creation time and during Stage.TOOL, so they can fail early
    • Bindings created by ThrowingProviderBinder now return proper dependencies instead of Injector.
  • Struts2
    • The Struts2 extension now works again! (It worked in Guice 1.0 and was somewhat broken in Guice 2.0)
  • Added to Injector: getAllBindings, getExistingBinding, getScopeBindings, getTypeConverterBindings.
  • Added to Key: hasAttributes, ofType, withoutAttributes
  • Various bug fixes / improvements:
    • Prevent child injectors from rebinding a parent just-in-time binding.
    • Non-intercepted methods in a class with other intercepted methods no longer go through cglib (reducing total stack frames).
    • Allow Guice to work on generated classes.
    • Fix calling Provider.get() of an unrelated Provider in a scoping method.
    • MoreTypes.getRawTypes returns the proper types for arrays (instead of Object.class)
    • JIT bindings left in a parent injector when child injectors fail creating a JIT binding are now removed
    • Overriding an @Inject method (if the subclass also annotates the method with @Inject) no longer injects the method twice
    • You can now bind byte constants (using ConstantBindingBuilder.to(byte))
    • Better exceptions when trying to intercept final classes, using keys already bound in child or private module, and many other cases.
    • ConvertedConstantBinding now exposes the TypeConverterBinding used to convert the constant.

Kategorien: Open Source, Google, Guice

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