Class WeakMemoryHolder

src/com/sun/jna/WeakMemoryHolder.java:40–55

Helper to hold a memory object based on the lifetime of another object. The intended use is to assoziate a ByteBuffer with its backing Memory object. The ByteBuffer is held by a WeakReference and a ReferenceQueue is used to track GC of the ByteBuffer. The references to the memory objects are rele

 * The references to the memory objects are released on access of WeakMemoryHolder.
 */
public class WeakMemoryHolder {
    ReferenceQueue<Object> referenceQueue = new ReferenceQueue<>();
    IdentityHashMap<Reference<Object>, Memory> backingMap = new IdentityHashMap<>();

    public synchronized void put(Object o, Memory m) {
        clean();
        Reference<Object> reference = new WeakReference<>(o, referenceQueue);
        backingMap.put(reference, m);
    }

    public synchronized void clean() {
        for(Reference ref = referenceQueue.poll(); ref != null; ref = referenceQueue.poll()) {
            backingMap.remove(ref);
        }
    }
}