Example usage for java.lang.ref PhantomReference PhantomReference

Introduction

In this page you can find the example usage for java.lang.ref PhantomReference PhantomReference.

Prototype

public PhantomReference(T referent, ReferenceQueue<? super T> q) 

Source Link

Document

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

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ReferenceQueue rq = new ReferenceQueue();
    PhantomReference<String> pr = new PhantomReference<String>("object", rq);

    while (true) {
        Reference r = rq.remove();
        if (r == pr) {
            // about to be reclaimed.
            r.clear();/* w w  w.  ja  v a 2 s . com*/
        }
    }
}

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From source file:Main.java

public static void main(String[] args) {
    ReferenceQueue referenceQueue = new ReferenceQueue();
    Object object = new Object() {
        public String toString() {
            return "Referenced Object";
        }/*from   w  ww .j  a v a  2s.  c  o m*/
    };

    Object data = new Object() {
        public String toString() {
            return "Data";
        }
    };

    HashMap map = new HashMap();
    Reference reference = null;
    System.out.println("Testing PhantomReference.");
    reference = new PhantomReference(object, referenceQueue);

    map.put(reference, data);

    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());

    System.gc();
    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());

    object = null;
    data = null;

    System.gc();
    System.out.println(reference.get());
    System.out.println(map.get(reference));
    System.out.println(reference.isEnqueued());
}

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From source file:org.mule.module.logging.MuleLogFactory.java

public Log getInstance(String name) throws LogConfigurationException {
    final ClassLoader ccl = Thread.currentThread().getContextClassLoader();
    ConcurrentMap<String, Log> loggerMap = repository.get(ccl == null ? NO_CCL_CLASSLOADER : ccl.hashCode());

    if (loggerMap == null) {
        loggerMap = new ConcurrentHashMap<String, Log>();

        final ConcurrentMap<String, Log> previous = repository
                .putIfAbsent(ccl == null ? NO_CCL_CLASSLOADER : ccl.hashCode(), loggerMap);
        if (previous != null) {
            loggerMap = previous;/*from w w  w . j a v a 2  s.  c o  m*/
        }

        if (ccl != null) {
            // must save a strong ref to the PhantomReference in order for it to stay alive and work
            refs.put(new PhantomReference<ClassLoader>(ccl, referenceQueue), ccl.hashCode());
        }

    }

    Log instance = loggerMap.get(name);

    if (instance == null) {
        Logger logger = LoggerFactory.getLogger(name);
        if (logger instanceof LocationAwareLogger) {
            instance = new MuleLocationAwareLog((LocationAwareLogger) logger);
        } else {
            instance = new MuleLog(logger);
        }
        final Log previous = loggerMap.putIfAbsent(name, instance);
        if (previous != null) {
            // someone got there before us
            instance = previous;
        }
    }

    return instance;
}

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From source file:xiaofei.library.hermes.util.HermesCallbackGc.java

public void register(IHermesServiceCallback callback, Object object, long timeStamp, int index) {
    gc();//  w w  w.ja  va  2  s.  c o m
    mTimeStamps.put(new PhantomReference<Object>(object, mReferenceQueue),
            Triple.create(callback, timeStamp, index));
}

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From source file:org.apache.sling.models.impl.ModelAdapterFactory.java

private void registerCallbackRegistry(Object object, DisposalCallbackRegistryImpl registry) {
    PhantomReference<Object> reference = new PhantomReference<Object>(object, queue);
    disposalCallbacks.put(reference, registry);
}

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