org.jvnet.hk2.internal

Class SingletonContext

java.lang.Object

org.jvnet.hk2.internal.SingletonContext

All Implemented Interfaces:

Context<javax.inject.Singleton>

@Singleton
public class SingletonContext
extends java.lang.Object
implements Context<javax.inject.Singleton>

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private static class	SingletonContext.GenerationComparator

Field Summary

Fields

Modifier and Type	Field and Description
private int	generationNumber
private ServiceLocatorImpl	locator
private Cache<ContextualInput<java.lang.Object>,java.lang.Object>	valueCache

Constructor Summary

Constructors

Constructor and Description
SingletonContext(ServiceLocatorImpl impl)

Method Summary

Modifier and Type	Method and Description
boolean	containsKey(ActiveDescriptor<?> descriptor) Determines if this context has a value for the given key
void	destroyOne(ActiveDescriptor<?> one) Release one system descriptor
<T> T	findOrCreate(ActiveDescriptor<T> activeDescriptor, ServiceHandle<?> root) Creates a contextual instance of this ActiveDescriptor by calling its create method if there is no other matching contextual instance.
java.lang.Class<? extends java.lang.annotation.Annotation>	getScope() The scope for which this is the context
boolean	isActive() True if this context is active, false otherwise
void	shutdown() Shut down this context.
boolean	supportsNullCreation() Returns true if the findOrCreate method can return null

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

generationNumber

private int generationNumber

locator

private final ServiceLocatorImpl locator

valueCache

private final Cache<ContextualInput<java.lang.Object>,java.lang.Object> valueCache

Constructor Detail

SingletonContext

SingletonContext(ServiceLocatorImpl impl)

Method Detail

getScope

public java.lang.Class<? extends java.lang.annotation.Annotation> getScope()

Description copied from interface: Context

The scope for which this is the context

Specified by:

getScope in interface Context<javax.inject.Singleton>

Returns:

may not return null, must return the scope for which this is a context

findOrCreate

public <T> T findOrCreate(ActiveDescriptor<T> activeDescriptor,
                          ServiceHandle<?> root)

Description copied from interface: Context

Creates a contextual instance of this ActiveDescriptor by calling its create method if there is no other matching contextual instance. If there is already a contextual instance it is returned. If parent is null then this must work like the find call

Specified by:

findOrCreate in interface Context<javax.inject.Singleton>

Parameters:

activeDescriptor - The descriptor to use when creating instances

root - The extended provider for the outermost parent being created

Returns:

A context instance. This value may NOT be null

containsKey

public boolean containsKey(ActiveDescriptor<?> descriptor)

Description copied from interface: Context

Determines if this context has a value for the given key

Specified by:

containsKey in interface Context<javax.inject.Singleton>

Parameters:

descriptor - The descriptor to look for in this context

Returns:

true if this context has a value associated with this descriptor

isActive

public boolean isActive()

Description copied from interface: Context

True if this context is active, false otherwise

Specified by:

isActive in interface Context<javax.inject.Singleton>

Returns:

true if this context is active, false otherwise

supportsNullCreation

public boolean supportsNullCreation()

Description copied from interface: Context

Returns true if the findOrCreate method can return null

Specified by:

supportsNullCreation in interface Context<javax.inject.Singleton>

Returns:

true if null is a legal value from the findOrCreate method

shutdown

public void shutdown()

Description copied from interface: Context

Shut down this context.

Specified by:

shutdown in interface Context<javax.inject.Singleton>

destroyOne

public void destroyOne(ActiveDescriptor<?> one)

Release one system descriptor

Specified by:

destroyOne in interface Context<javax.inject.Singleton>

Parameters:

one - The descriptor to release (may not be null). Further, the cache MUST be set