Example usage for java.lang.ref ReferenceQueue ReferenceQueue

Introduction

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

Prototype

public ReferenceQueue() 

Source Link

Document

Constructs a new reference-object queue.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    ReferenceQueue rq = new ReferenceQueue();
    WeakReference<String> wr = new WeakReference<String>("string", rq);

    while (true) {
        Reference r = rq.remove();
        if (r == wr) {
            System.out.println("no longer referenced");
        }/*from  w  w w.ja  va2  s  .  c  o m*/
    }
}

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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();//  ww w  .jav a  2s .c  o  m
        }
    }
}

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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 va 2s.co  m*/
    };
    Object data = new Object() {
        public String toString() {
            return "Data";
        }
    };

    HashMap map = new HashMap();
    Reference reference = new SoftReference(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:Main.java

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

    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());
}

---

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";
        }/*  w w w.  j  av a  2 s  .  c o  m*/
    };

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

    HashMap map = new HashMap();
    Reference reference = new SoftReference(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());
}

---

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  ww  w . ja  va  2 s .co m*/
    };

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

    HashMap map = new HashMap();
    Reference reference = null;
    System.out.println("Testing WeakReference.");
    reference = new WeakReference(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:xiaofei.library.hermes.util.HermesCallbackGc.java

private HermesCallbackGc() {
    mReferenceQueue = new ReferenceQueue<Object>();
    mTimeStamps = new ConcurrentHashMap<PhantomReference<Object>, Triple<IHermesServiceCallback, Long, Integer>>();
}

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From source file:org.polymap.core.runtime.cache.Soft2CacheManager.java

protected Soft2CacheManager() {
    caches = new MapMaker().initialCapacity(256).weakValues().makeMap();
    refQueue = new ReferenceQueue();

    // start thread
    thread = new QueueChecker();
    thread.start();//from ww  w.j a va  2  s  .  c  om
}

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From source file:org.entrystore.repository.impl.SoftCache.java

public SoftCache() {
    clearedRefs = new ReferenceQueue<Entry>();

    // start thread to delete cleared references from the cache
    remover = new Remover(clearedRefs, this);
    remover.start();/*  w w w .  j av a  2 s.  c  o  m*/

    // add a shutdown hook to interrupt the endless loop
    // the hook is only called when the whole VM is shutdown
    Runtime.getRuntime().addShutdownHook(new Thread() {
        public void run() {
            shutdown();
        }
    });
}

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From source file:WeakCanonicalSet.java

public WeakCanonicalSet() {
    final int initialCapacity = 101;
    final float loadFactor = 0.75f;
    this.loadFactor = loadFactor;
    this.table = new Entry[initialCapacity];
    this.threshold = (int) (initialCapacity * loadFactor);
    this.queue = new ReferenceQueue<T>();
}

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