javax.enterprise.context.spi

Interface Context

All Known Subinterfaces:

AlterableContext, ApplicationContext, BoundContext<S>, BoundConversationContext, BoundRequestContext, BoundSessionContext, ConversationContext, DependentContext, EjbRequestContext, HttpConversationContext, HttpRequestContext, HttpSessionContext, ManagedContext, RequestContext, SessionContext, SingletonContext, WeldAlterableContext

public interface Context

Provides an operation for obtaining contextual instances with a particular scope of any contextual type. Any instance of Context is called a context object.

AlterableContext was introduced in CDI 1.1 to allow bean instances to be destroyed by the application. Extensions should implement AlterableContext instead of Context.

The context object is responsible for creating and destroying contextual instances by calling operations of Contextual. In particular, the context object is responsible for destroying any contextual instance it creates by passing the instance to Contextual.destroy(Object, CreationalContext) . A destroyed instance must not subsequently be returned by get(). The context object must pass the same instance of CreationalContext to Contextual.destroy() that it passed to Contextual.create() when it created the instance.

A custom context object may be registered with the container using AfterBeanDiscovery.addContext(Context).

Author:

Gavin King, Pete Muir

Method Summary

Modifier and Type	Method and Description
<T> T	get(Contextual<T> contextual) Return an existing instance of a certain contextual type or a null value.
<T> T	get(Contextual<T> contextual, CreationalContext<T> creationalContext) Return an existing instance of certain contextual type or create a new instance by calling Contextual.create(CreationalContext) and return the new instance.
Class<? extends Annotation>	getScope() Get the scope type of the context object.
boolean	isActive() Determines if the context object is active.

Method Detail

getScope

Class<? extends Annotation> getScope()

Get the scope type of the context object.

Returns:

the scope

get

<T> T get(Contextual<T> contextual,
          CreationalContext<T> creationalContext)

Return an existing instance of certain contextual type or create a new instance by calling Contextual.create(CreationalContext) and return the new instance.

Type Parameters:

T - the type of contextual type

Parameters:

contextual - the contextual type

creationalContext - the context in which the new instance will be created

Returns:

the contextual instance

Throws:

ContextNotActiveException - if the context is not active

get

<T> T get(Contextual<T> contextual)

Return an existing instance of a certain contextual type or a null value.

Type Parameters:

T - the type of the contextual type

Parameters:

contextual - the contextual type

Returns:

the contextual instance, or a null value

Throws:

ContextNotActiveException - if the context is not active

isActive

boolean isActive()

Determines if the context object is active.

Returns:

true if the context is active, or false otherwise.