Module jakarta.cdi

Package jakarta.enterprise.inject.spi

package jakarta.enterprise.inject.spi

The portable extension integration SPI.

A portable extension may integrate with the container by:

• Providing its own beans, interceptors and decorators to the container
• Injecting dependencies into its own objects using the dependency injection service
• Providing a context implementation for a custom scope
• Augmenting or overriding the annotation-based metadata with metadata from some other source

The BeanManager object

Portable extensions sometimes interact directly with the container via programmatic API call. The interface BeanManager provides operations for obtaining contextual references for beans, along with many other operations of use to portable extensions.

Container lifecycle events

During the application initialization process, the container fires a series of events, allowing portable extensions to integrate with the container initialization process. Observer methods of these events must belong to extensions declared in META-INF/services.

Lifecycle events include BeforeBeanDiscovery, AfterBeanDiscovery, AfterDeploymentValidation and BeforeShutdown.

Interfaces representing enabled beans

The interfaces Bean, Decorator, Interceptor and ObserverMethod define everything the container needs to manage instances of a bean, interceptor, decorator or observer method.

An instance of Bean exists for every enabled bean. A portable extension may add support for new kinds of beans by implementing Bean, observing the event AfterBeanDiscovery event registering beans with the container. An instance of ObserverMethod exists for every observer method of every enabled bean. A portable extension may add observers by implementing ObserverMethod and registering an instance with the container.

A portable extension may be notified of the existence of an enabled bean by observing the container lifecycle event type ProcessBean or one of its subtypes, or of the existence of an observer method of an enabled bean by observing the event type ProcessObserverMethod.

Alternate metadata sources

A portable extension may provide an alternative metadata source, such as configuration by XML.

Annotated and its subtypes allow a portable extension to specify metadata that overrides the annotations that exist on a bean class. The portable extension is responsible for implementing the interfaces, thereby exposing the metadata to the container. The container must use the operations of Annotated and its subinterfaces to discover program element types and annotations, instead of directly calling the Java Reflection API.

A portable extension provides its metadata to the container by observing the event ProcessAnnotatedType and wrapping the AnnotatedType.

Producer and InjectionTarget

The interfaces Producer and InjectionTarget abstract the basic lifecycle of (contextual or non-contextual) container managed objects, including instantiation and destruction, dependency injection and lifecycle callbacks.

An instance of InjectionTarget may be product of BeanManager.getInjectionTargetFactory(AnnotatedType) obtained from the BeanManager, allowing a portable extension to request these container services for objects under the control of the portable extension.

Furthermore, a portable extension may replace the implementation of InjectionTarget or Producer used by the container with its own implementation by observing the events ProcessInjectionTarget or ProcessProducer.

See Also:

• jakarta.enterprise.inject
• jakarta.enterprise.context.spi

Related Packages

Module	Package	Description
jakarta.cdi	jakarta.enterprise.inject
jakarta.cdi	jakarta.enterprise.inject.spi.configurator
jakarta.cdi.el	jakarta.enterprise.inject.spi.el
jakarta.cdi	jakarta.enterprise.inject.literal
jakarta.cdi	jakarta.enterprise.inject.se

Class	Description
AfterBeanDiscovery	The event type of the second event fired by the container when it has fully completed the bean discovery process, validated that there are no definition errors relating to the discovered beans, and registered Bean and ObserverMethod objects for the discovered beans, but before detecting deployment problems.
AfterDeploymentValidation	The event type of the third event fired by the container after it has validated that there are no deployment problems and before creating contexts or processing requests.
AfterTypeDiscovery	This event type is thrown by the container after type discovery is complete.
Annotated	Represents a Java program element that can be annotated.
AnnotatedCallable<X>	Represents a callable member of a Java type.
AnnotatedConstructor<X>	Represents a constructor of a Java class.
AnnotatedField<X>	Represents a field of a Java class.
AnnotatedMember<X>	Represents a member of a Java type.
AnnotatedMethod<X>	Represents a method of a Java type.
AnnotatedParameter<X>	Represents a parameter of a method or constructor.
AnnotatedType<X>	Represents a Java class or interface.
Bean<T>	Represents an enabled bean.
BeanAttributes<T>	The BeanAttributes interface exposes the basic attributes of a bean.
BeanContainer	BeanContainer is a superclass of BeanManager containing capabilities that are portable across all CDI environments.
BeanManager	Allows a portable extension to interact directly with the container.
BeforeBeanDiscovery	This event type is thrown by the container before the bean discovery process begins.
BeforeShutdown	The type of the final event the container fires after it has finished processing requests and destroyed all contexts.
CDI<T>	Provides access to the current container.
CDIProvider	Interface implemented by a CDI provider to provide access to the current container
Decorator<T>	Represents an enabled decorator.
DefinitionException	Thrown when a definition error occurs.
DeploymentException	Thrown when a deployment problem occurs.
EventContext<T>	Represents a context of a fired event.
EventMetadata	Provides access to metadata about an observed event payload.
Extension	Service interface implemented by extensions.
InjectionPoint	Provides access to metadata about an injection point.
InjectionTarget<T>	Provides operations for performing dependency injection and lifecycle callbacks on an instance of a type.
InjectionTargetFactory<T>	An InjectionTargetFactory can create an InjectionTarget for a given bean.
InterceptionFactory<T>	InterceptionFactory allows to create a wrapper instance whose method invocations are intercepted by method interceptors and forwarded to a provided instance.
InterceptionType	Identifies the kind of lifecycle callback, EJB timeout method or business method interception.
Interceptor<T>	Represents an enabled interceptor.
ObserverMethod<T>	Represents an observer method of an enabled bean.
PassivationCapable	Indicates that a custom implementation of Bean or Contextual is passivation capable.
Prioritized	This interface allows some SPI implementation to change their priority programmatically.
ProcessAnnotatedType<X>	The container fires an event of this type for each Java class or interface it discovers in a bean archive, before it reads the declared annotations.
ProcessBean<X>	The container fires an event of this type for each enabled bean, interceptor or decorator deployed in a bean archive, before registering the Bean object.
ProcessBeanAttributes<T>	The container fires an event of this type for each enabled bean, interceptor or decorator deployed in a bean archive before registering the Bean object.
ProcessInjectionPoint<T,X>	The container fires an event of this type for every injection point of every Java EE component class supporting injection that may be instantiated by the container at runtime, including every EJB session or message-driven bean, enabled bean, enabled interceptor or enabled decorator.
ProcessInjectionTarget<X>	The container fires an event of this type for every Java EE component class supporting injection that may be instantiated by the container at runtime, including EJB session or message-driven bean, enabled bean, enabled interceptor or enabled decorator.
ProcessManagedBean<X>	The container fires an event of this type for each enabled managed bean, before registering the Bean object.
ProcessObserverMethod<T,X>	The container fires an event of this type for each observer method of each enabled bean, before registering the ObserverMethod object.
ProcessProducer<T,X>	The container fires an event of this type for each producer method or field of each enabled bean, including resources.
ProcessProducerField<T,X>	The container fires an event of this type for each enabled producer field, before registering the Bean object.
ProcessProducerMethod<T,X>	The container fires an event of this type for each enabled producer method, before registering the Bean object.
ProcessSessionBean<X>	The container fires an event of this type for each enabled session bean, before registering the Bean object.
ProcessSyntheticAnnotatedType<X>	The container fires an event of this type for each Java class or interface added by BeforeBeanDiscovery.addAnnotatedType(AnnotatedType, String) or AfterTypeDiscovery.addAnnotatedType(AnnotatedType, String)
ProcessSyntheticBean<X>	The container fires an event of this type for each custom bean implementation added through AfterBeanDiscovery.addBean() or AfterBeanDiscovery.addBean(Bean), before registering the Bean object.
ProcessSyntheticObserverMethod<T,X>	The container fires an event of this type for each custom implementation of ObserverMethod added through AfterBeanDiscovery.addObserverMethod(ObserverMethod) or AfterBeanDiscovery.addObserverMethod(), before registering the ObserverMethod object.
Producer<T>	Provides a generic operation for producing an instance of a type.
ProducerFactory<X>	An ProducerFactory can create an Producer for a given bean.
SessionBeanType	Identifies the kind of EJB session bean.
Unmanaged<T>	Helper class for injecting and calling lifecycle callbacks unmanaged instances for use by framework and library integrators.
Unmanaged.UnmanagedInstance<T>	Represents a non-contextual instance.
WithAnnotations	WithAnnotations may be applied to any portable extension observer method with an event parameter type of ProcessAnnotatedType to filter the events delivered.