Examples of java.lang.ref.WeakReference

java.lang.ref.WeakReference
Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed. Weak references are most often used to implement canonicalizing mappings.
Suppose that the garbage collector determines at a certain point in time that an object is weakly reachable. At that time it will atomically clear all weak references to that object and all weak references to any other weakly-reachable objects from which that object is reachable through a chain of strong and soft references. At the same time it will declare all of the formerly weakly-reachable objects to be finalizable. At the same time or at some later time it will enqueue those newly-cleared weak references that are registered with reference queues. @version 1.19, 11/17/05 @author Mark Reinhold @since 1.2

  private static final class SweepTask extends TimerTask {


    private final WeakReference poolRef;


    private SweepTask(Pool pool) {
      this.poolRef = new WeakReference(pool);
    }

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     */
    public TransactionContext(TransactionRegistry transactionRegistry, Transaction transaction) {
        if (transactionRegistry == null) throw new NullPointerException("transactionRegistry is null");
        if (transaction == null) throw new NullPointerException("transaction is null");
        this.transactionRegistry = transactionRegistry;
        this.transactionRef = new WeakReference(transaction);
    }

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     */
    protected void registerCursor(Cursor cur) {
        // We take this opportunity to clean the _cursors list
        // of WeakReference objects to garbage-collected cursors.
        for (Iterator it = _cursors.iterator(); it.hasNext(); ) {
            WeakReference ref = (WeakReference) it.next();
            if (ref.get() == null) {
                it.remove();
            }
        }


        _cursors.add( new WeakReference(cur) );
    }

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     * Removes a {@link CursorableLinkedList.Cursor} from
     * the set of cursors to be notified of changes to this list.
     */
    protected void unregisterCursor(Cursor cur) {
        for (Iterator it = _cursors.iterator(); it.hasNext(); ) {
            WeakReference ref = (WeakReference) it.next();
            Cursor cursor = (Cursor) ref.get();
            if (cursor == null) {
                // some other unrelated cursor object has been
                // garbage-collected; let's take the opportunity to
                // clean up the cursors list anyway..
                it.remove();


            } else if (cursor == cur) {
                ref.clear();
                it.remove();
                break;
            }
        }
    }

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     * invalid.
     */
    protected void invalidateCursors() {
        Iterator it = _cursors.iterator();
        while (it.hasNext()) {
            WeakReference ref = (WeakReference) it.next();
            Cursor cursor = (Cursor) ref.get();
            if (cursor != null) {
                // cursor is null if object has been garbage-collected
                cursor.invalidate();
                ref.clear();
            }
            it.remove();
        }
    }

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     * @see #set(int,java.lang.Object)
     */
    protected void broadcastListableChanged(Listable elt) {
        Iterator it = _cursors.iterator();
        while (it.hasNext()) {
            WeakReference ref = (WeakReference) it.next();
            Cursor cursor = (Cursor) ref.get();
            if (cursor == null) {
                it.remove(); // clean up list
            } else {
                cursor.listableChanged(elt);
            }

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     * element was just removed from my list.
     */
    protected void broadcastListableRemoved(Listable elt) {
        Iterator it = _cursors.iterator();
        while (it.hasNext()) {
            WeakReference ref = (WeakReference) it.next();
            Cursor cursor = (Cursor) ref.get();
            if (cursor == null) {
                it.remove(); // clean up list
            } else {
                cursor.listableRemoved(elt);
            }

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     * element was just added to my list.
     */
    protected void broadcastListableInserted(Listable elt) {
        Iterator it = _cursors.iterator();
        while (it.hasNext()) {
            WeakReference ref = (WeakReference) it.next();
            Cursor cursor = (Cursor) ref.get();
            if (cursor == null) {
                it.remove();  // clean up list
            } else {
                cursor.listableInserted(elt);
            }

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        // Refer to the log stream via a weak reference so that this thread
        // doesn't prevent it from being garbage collected.
        private WeakReference mLogStream;


        public AutoRollover(IntervalLogStream stream) {
            mLogStream = new WeakReference(stream);
        }

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    public Log(String name, Log parent) {
        this();


        if (parent != null) {
            mParent = parent;
            parent.mChildren.add(new WeakReference(this));
            mEnabledFlags = parent.mEnabledFlags;
            addLogListener(parent);
        }


        mName = name;

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