org.wildfly.common.ref

Class References

java.lang.Object

org.wildfly.common.ref.References

public final class References
extends Object

A set of utility methods for reference types.

Method Summary

Modifier and Type	Method and Description
static <T,A> Reference<T,A>	create(Reference.Type type, T value, A attachment) Create a reference of a given type with the provided value and attachment.
static <T,A> Reference<T,A>	create(Reference.Type type, T value, A attachment, Reaper<T,A> reaper) Create a reference of a given type with the provided value and attachment.
static <T,A> Reference<T,A>	create(Reference.Type type, T value, A attachment, ReferenceQueue<? super T> referenceQueue) Create a reference of a given type with the provided value and attachment.
static <T,A> Reference<T,A>	getNullReference() Get a null reference.

Methods inherited from class java.lang.Object

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

Method Detail

create

public static <T,A> Reference<T,A> create(Reference.Type type,
                                          T value,
                                          A attachment,
                                          Reaper<T,A> reaper)

Create a reference of a given type with the provided value and attachment. If the reference type is Reference.Type.STRONG or Reference.Type.NULL then the reaper argument is ignored. If the reference type is Reference.Type.NULL then the value and attachment arguments are ignored.

Type Parameters:

T - the reference value type

A - the reference attachment type

Parameters:

type - the reference type

value - the reference value

attachment - the attachment value

reaper - the reaper to use, if any

Returns:

the reference

create

public static <T,A> Reference<T,A> create(Reference.Type type,
                                          T value,
                                          A attachment,
                                          ReferenceQueue<? super T> referenceQueue)

Create a reference of a given type with the provided value and attachment. If the reference type is Reference.Type.STRONG or Reference.Type.NULL then the reference queue argument is ignored. If the reference type is Reference.Type.NULL then the value and attachment arguments are ignored.

Type Parameters:

T - the reference value type

A - the reference attachment type

Parameters:

type - the reference type

value - the reference value

attachment - the attachment value

referenceQueue - the reference queue to use, if any

Returns:

the reference

create

public static <T,A> Reference<T,A> create(Reference.Type type,
                                          T value,
                                          A attachment)
                                   throws IllegalArgumentException

Create a reference of a given type with the provided value and attachment. If the reference type is Reference.Type.PHANTOM then this method will return a null reference because such references are not constructable without a queue or reaper. If the reference type is Reference.Type.NULL then the value and attachment arguments are ignored.

Type Parameters:

T - the reference value type

A - the reference attachment type

Parameters:

type - the reference type

value - the reference value

attachment - the attachment value

Returns:

the reference

Throws:

IllegalArgumentException - if the reference type is Reference.Type.PHANTOM

getNullReference

public static <T,A> Reference<T,A> getNullReference()

Get a null reference. This reference type is always cleared and does not retain an attachment; as such there is only one single instance of it.

Type Parameters:

T - the reference value type

A - the attachment value type

Returns:

the null reference