Examples of java.lang.ref.Reference

java.lang.ref.Reference
Abstract base class for reference objects. This class defines the operations common to all reference objects. Because reference objects are implemented in close cooperation with the garbage collector, this class may not be subclassed directly. @version 1.43, 04/10/06 @author Mark Reinhold @since 1.2

         * Start execution.
         */
        public void run() {
            while (true) {
                try {
                    Reference ref = REFERENCE_QUEUE.remove();
                    if (ref != null) {
                        handleReference(ref);
                    }
                } catch (InterruptedException e) {
                    LOG.debug("ReferenceQueueThread interrupted", e);

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    /** Close the native library we're mapped to. */
    public void dispose() {
        synchronized(libraries) {
            for (Iterator i=libraries.values().iterator();i.hasNext();) {
                Reference ref = (WeakReference)i.next();
                if (ref.get() == this) {
                    i.remove();
                }
            }
        }
        synchronized(this) {

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        if (!type.isInterface())
            throw new IllegalArgumentException("Callback type must be an interface");
        Map map = direct ? directCallbackMap : callbackMap;
        synchronized(callbackMap) {
            Callback cb = null;
            Reference ref = (Reference)pointerCallbackMap.get(p);
            if (ref != null) {
                cb = (Callback)ref.get();
                if (cb != null && !type.isAssignableFrom(cb.getClass())) {
                    throw new IllegalStateException("Pointer " + p + " already mapped to " + cb);
                }
                return cb;
            }

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     * @param md The method descriptor
     * @return The cached method
     */
  private static Method getCachedMethod(MethodDescriptor md) {
        if (CACHE_METHODS) {
            Reference methodRef = (Reference)cache.get(md);
            if (methodRef != null) {
                return (Method)methodRef.get();
            }
        }
        return null;
    }

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    private final Class nativeType;
    private final NativeMapped instance;


    public static NativeMappedConverter getInstance(Class cls) {
        synchronized(converters) {
            Reference r = (Reference)converters.get(cls);
            NativeMappedConverter nmc = r != null ? (NativeMappedConverter)r.get() : null;
            if (nmc == null) {
                nmc = new NativeMappedConverter(cls);
                converters.put(cls, new SoftReference(nmc));
            }
            return nmc;

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        if (!type.isInterface())
            throw new IllegalArgumentException("Callback type must be an interface");
        Map map = direct ? directCallbackMap : callbackMap;
        synchronized(callbackMap) {
            Callback cb = null;
            Reference ref = (Reference)pointerCallbackMap.get(p);
            if (ref != null) {
                cb = (Callback)ref.get();
                if (cb != null && !type.isAssignableFrom(cb.getClass())) {
                    throw new IllegalStateException("Pointer " + p + " already mapped to " + cb);
                }
                return cb;
            }

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        Set values;
        synchronized(libraries) {
            values = new HashSet(libraries.values());
        }
        for (Iterator i=values.iterator();i.hasNext();) {
            Reference ref = (WeakReference)i.next();
            NativeLibrary lib = (NativeLibrary)ref.get();
            if (lib != null) {
                lib.dispose();
            }
        }
    }

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        public void run() {


            while(true) {


                try {
                    Reference ref = referenceQueue.remove();


                    if ( ref != null ) {
                        HostConfiguration config = (HostConfiguration)
                            referenceToHostConfig.get(ref);
                        referenceToHostConfig.remove(ref);

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     * care must be taken if, for instance, you want stale
     * mappings to be removed on a periodic basis by some
     * background thread.
     */
    protected void purge() {
        Reference ref = queue.poll();
        while (ref != null) {
            purge(ref);
            ref = queue.poll();
        }
    }

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     * care must be taken if, for instance, you want stale
     * mappings to be removed on a periodic basis by some
     * background thread.
     */
    private void purge() {
        Reference ref = queue.poll();
        while (ref != null) {
            purge(ref);
            ref = queue.poll();
        }
    }

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