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:ReferenceValueMap.java

/**
 * Clone method./*from   www.j a v a  2  s .  co  m*/
 * @return Clone of this object.
 **/
public Object clone() {
    reap();

    ReferenceValueMap rvm = null;

    try {
        rvm = (ReferenceValueMap) super.clone();
    } catch (CloneNotSupportedException e) {
        // Do nothing
    }

    rvm.map = (HashMap) map.clone(); // to preserve initialCapacity, loadFactor
    rvm.map.clear();
    rvm.reaped = new ReferenceQueue();
    rvm.putAll(entrySet());

    return rvm;
}

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From source file:com.silverwrist.dynamo.index.IndexManagerObject.java

public IndexManagerObject() {
    m_resolvers = new Hashtable();
    m_indexcache = new ReferenceMap(ReferenceMap.HARD, ReferenceMap.SOFT);
    m_cleanupqueue = new ReferenceQueue();

}

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From source file:SoftValueMap.java

/**
 * Constructs a SoftValueMap with specified initial capacity, load factor,
 * and cleared value removal frequencies.
 *
 * @param initialCapacity initial number of hash buckets in the table
 * [may not be negative, 0 is equivalent to 1].
 * @param loadFactor the load factor to use to determine rehashing points
 * [must be in (0.0, 1.0] range].//from   w w w.  j  av a  2  s  .com
 * @param readClearCheckFrequency specifies that every readClearCheckFrequency
 * {@link #get} should check for and remove all mappings whose soft values
 * have been cleared by the garbage collector [may not be less than 1].
 * @param writeClearCheckFrequency specifies that every writeClearCheckFrequency
 * {@link #put} should check for and remove all mappings whose soft values
 * have been cleared by the garbage collector [may not be less than 1].
 */
public SoftValueMap(int initialCapacity, final float loadFactor, final int readClearCheckFrequency,
        final int writeClearCheckFrequency) {
    if (initialCapacity < 0)
        throw new IllegalArgumentException("negative input: initialCapacity [" + initialCapacity + "]");
    if ((loadFactor <= 0.0) || (loadFactor >= 1.0 + 1.0E-6))
        throw new IllegalArgumentException("loadFactor not in (0.0, 1.0] range: " + loadFactor);
    if (readClearCheckFrequency < 1)
        throw new IllegalArgumentException(
                "readClearCheckFrequency not in [1, +inf) range: " + readClearCheckFrequency);
    if (writeClearCheckFrequency < 1)
        throw new IllegalArgumentException(
                "writeClearCheckFrequency not in [1, +inf) range: " + writeClearCheckFrequency);

    if (initialCapacity == 0)
        initialCapacity = 1;

    m_valueReferenceQueue = new ReferenceQueue();

    m_loadFactor = loadFactor;
    m_sizeThreshold = (int) (initialCapacity * loadFactor);

    m_readClearCheckFrequency = readClearCheckFrequency;
    m_writeClearCheckFrequency = writeClearCheckFrequency;

    m_buckets = new SoftEntry[initialCapacity];
}

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From source file:WeakSet.java

/** Constructs a new, empty set;
*
* @param initialCapacity initial capacity
* @param loadFactor load factor/* w w  w.  j  a v a2s .c  o  m*/
*/
public WeakSet(int initialCapacity, float loadFactor) {
    if ((initialCapacity <= 0) || (loadFactor <= 0)) {
        throw new IllegalArgumentException();
    }

    size = 0;
    modcount = 0;
    this.loadFactor = loadFactor;
    nullCount = 0;
    refq = new ReferenceQueue<E>();
    entries = Entry.createArray(initialCapacity);
    iterChain = null;
}

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From source file:org.enerj.apache.commons.beanutils.BeanificationTestCase.java

/** Tests whether classloaders and beans are released from memory by the map used by beanutils */
public void testMemoryLeak2() throws Exception {
    // tests when the map used by beanutils has the right behaviour

    if (isPre14JVM()) {
        System.out.println("WARNING: CANNOT TEST MEMORY LEAK ON PRE1.4 JVM");
        return;//from w w w .j  a  va  2s  . c  o m
    }

    // many thanks to Juozas Baliuka for suggesting this methodology
    TestClassLoader loader = new TestClassLoader();
    ReferenceQueue queue = new ReferenceQueue();
    WeakReference loaderReference = new WeakReference(loader, queue);
    Integer test = new Integer(1);

    WeakReference testReference = new WeakReference(test, queue);
    //Map map = new ReferenceMap(ReferenceMap.WEAK, ReferenceMap.HARD, true);
    Map map = new WeakHashMap();
    map.put(loader, test);

    assertEquals("In map", test, map.get(loader));
    assertNotNull("Weak reference released early (1)", loaderReference.get());
    assertNotNull("Weak reference released early (2)", testReference.get());

    // dereference strong references
    loader = null;
    test = null;

    int iterations = 0;
    int bytz = 2;
    while (true) {
        System.gc();
        if (iterations++ > MAX_GC_ITERATIONS) {
            fail("Max iterations reached before resource released.");
        }
        map.isEmpty();

        if (loaderReference.get() == null && testReference.get() == null) {
            break;

        } else {
            // create garbage:
            byte[] b = new byte[bytz];
            bytz = bytz * 2;
        }
    }
}

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From source file:org.paxle.core.doc.impl.CommandTracker.java

@Activate
protected void activate(Map<String, Object> props) {
    this.refQueue = new ReferenceQueue<ICommand>();

    this.commandIDTable = new Hashtable<Long, WeakReference<ICommand>>();
    this.commandLocationTable = new Hashtable<URI, WeakReference<ICommand>>();
    this.destroyedCommandMap = new LinkedList<DestroyedCommandData>();

    this.setName("CommandTracker");
    this.start();
}

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From source file:WeakIdentityMap.java

public WeakIdentityMap(int initialCapacity, float loadFactor) {
    if (initialCapacity <= 0) {
        throw new IllegalArgumentException("Initial capacity must be greater than 0");
    }/*from www .ja  v  a  2 s  . c  o m*/
    if (loadFactor <= 0 || Float.isNaN(loadFactor)) {
        throw new IllegalArgumentException("Load factor must be greater than 0");
    }
    this.loadFactor = loadFactor;
    this.table = new Entry[initialCapacity];
    this.threshold = (int) (initialCapacity * loadFactor);
    this.queue = new ReferenceQueue();
}

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From source file:org.apache.ojb.broker.util.ReferenceMap.java

/**
 *  Reads the contents of this object from the given input stream.
 *
 *  @param inp  the input stream to read from
 *  @throws java.io.IOException  if the stream raises it
 *  @throws java.lang.ClassNotFoundException  if the stream raises it
 *//*from w  w w  . j a  va2s. co m*/
private void readObject(ObjectInputStream inp) throws IOException, ClassNotFoundException {
    inp.defaultReadObject();
    table = new Entry[inp.readInt()];
    threshold = (int) (table.length * loadFactor);
    queue = new ReferenceQueue();
    Object key = inp.readObject();
    while (key != null) {
        Object value = inp.readObject();
        put(key, value);
        key = inp.readObject();
    }
}

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From source file:WeakSet.java

@SuppressWarnings("unchecked")
private void readObject(ObjectInputStream obtis) throws IOException, ClassNotFoundException {
    obtis.defaultReadObject();//  w  w w  .ja  va  2 s.c  o m

    Object[] arr = (Object[]) obtis.readObject();
    entries = new Entry[(int) (size * 1.5)];
    refq = new ReferenceQueue<E>();

    for (int i = 0; i < arr.length; i++) {
        add((E) arr[i]);
    }
}

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

@Activate
protected void activate(final ComponentContext ctx) {
    Dictionary<?, ?> props = ctx.getProperties();
    final int maxRecursionDepth = PropertiesUtil.toInteger(props.get(PROP_MAX_RECURSION_DEPTH),
            DEFAULT_MAX_RECURSION_DEPTH);
    this.invocationCountThreadLocal = new ThreadLocal<ThreadInvocationCounter>() {
        @Override//  w w w.j a  v  a2s . com
        protected ThreadInvocationCounter initialValue() {
            return new ThreadInvocationCounter(maxRecursionDepth);
        }
    };

    BundleContext bundleContext = ctx.getBundleContext();
    this.queue = new ReferenceQueue<Object>();
    this.disposalCallbacks = new ConcurrentHashMap<java.lang.ref.Reference<Object>, DisposalCallbackRegistryImpl>();
    Hashtable<Object, Object> properties = new Hashtable<Object, Object>();
    properties.put(Constants.SERVICE_VENDOR, "Apache Software Foundation");
    properties.put(Constants.SERVICE_DESCRIPTION, "Sling Models OSGi Service Disposal Job");
    properties.put("scheduler.concurrent", false);
    properties.put("scheduler.period", 30L);

    this.jobRegistration = bundleContext.registerService(Runnable.class.getName(), this, properties);

    this.listener = new ModelPackageBundleListener(ctx.getBundleContext(), this, this.adapterImplementations);

    Hashtable<Object, Object> printerProps = new Hashtable<Object, Object>();
    printerProps.put(Constants.SERVICE_VENDOR, "Apache Software Foundation");
    printerProps.put(Constants.SERVICE_DESCRIPTION, "Sling Models Configuration Printer");
    printerProps.put("felix.webconsole.label", "slingmodels");
    printerProps.put("felix.webconsole.title", "Sling Models");
    printerProps.put("felix.webconsole.configprinter.modes", "always");

    this.configPrinterRegistration = bundleContext.registerService(Object.class.getName(),
            new ModelConfigurationPrinter(this), printerProps);
}

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