StrongWeakReference

public class StrongWeakReference<T> extends WeakReference<T>

saker.util.ref.StrongWeakReference<T>

java.lang.ref.WeakReference<T>

java.lang.ref.Reference<T>

java.lang.Object

Reference class that allows the referent to be strongly referenced alongside its weak reference.

This class works the same way as WeakReference, but when constructed, it also holds the referent by a strong reference. This prevents it from being garbage collected until makeWeak() is called.

This class is useful when dynamic caching is implemented. Making a reference weak can allow the referenced object to be garbage collected, but calling makeStrong() again, can allow the client to reuse a not yet garbage collected object instead of creating a new one.

TThe type of the referenced object.

StrongSoftReference

Constructors

public	StrongWeakReference(T referent) Creates a new weak reference that refers to the given object.
public	StrongWeakReference(T referent, ReferenceQueue<? super T> q) Creates a new weak reference that refers to the given object and is registered with the given queue.

Methods

public void	clear() Clears this reference object.
public boolean	makeStrong() Tries to make `this` reference strong again, by assigning the strong reference to the referent.
public void	makeWeak() Makes `this` reference weak by clearing its strong reference.

Inherited methods
From: Reference<T> enqueue, get, isEnqueued
From: Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

public StrongWeakReference(T referent) throws NullPointerException

Documentation included from: WeakReference

Creates a new weak reference that refers to the given object. The new reference is not registered with any queue.

referentobject the new weak reference will refer to

public StrongWeakReference(T referent, ReferenceQueue<? super T> q) throws NullPointerException

Documentation included from: WeakReference

Creates a new weak reference that refers to the given object and is registered with the given queue.

referentobject the new weak reference will refer to

qthe queue with which the reference is to be registered, or null if registration is not required

public void clear()

Overridden from: Reference

Clears this reference object. Invoking this method will not cause this object to be enqueued.

This method is invoked only by Java code; when the garbage collector clears references it does so directly, without invoking this method.

public boolean makeStrong()

Tries to make this reference strong again, by assigning the strong reference to the referent.

This method can fail and return false, if the referenced object was already garbage collected. (I.e. Reference.get() returns null.)

If this method succeeds, then the following calls to Reference.get() will return non-null.

true if the reference was successfully made strong.

public void makeWeak()

Makes this reference weak by clearing its strong reference.