Example usage for org.apache.commons.collections.map ReferenceMap ReferenceMap

Introduction

In this page you can find the example usage for org.apache.commons.collections.map ReferenceMap ReferenceMap.

Prototype

public ReferenceMap(int keyType, int valueType, boolean purgeValues) 

Source Link

Document

Constructs a new ReferenceMap that will use the specified types of references.

Usage

From source file:com.google.gwt.dev.javac.TypeOracleMediatorTestBase.java

/**
 * Tests which variant of AbstractRefrenceMap we want to store the map for
 * parameterizedTypes, arrayTypes, and wildCardTypes in TypeOracle. Note: this
 * test is manual because gc can be unreliable.
 *//*from w ww. j  a v a 2 s  .  c o  m*/
@SuppressWarnings("unchecked")
public void manualTestAbstractRefrenceMap() {

    /*
     * with a HARD -> WEAK map, verify that the entry remains if there is no
     * reference to key, but is deleted when the reference to value is gone
     */
    Map<Integer, Integer> simpleMap = new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.WEAK,
            true);
    Integer bar = new Integer(42);
    simpleMap.put(new Integer(32), bar);
    Runtime.getRuntime().gc();
    assertEquals(1, simpleMap.size());
    bar = null;
    Runtime.getRuntime().gc();
    assertEquals(0, simpleMap.size());

    /*
     * with a WEAK -> WEAK map, verify that the entry is gone if there are no
     * references to either the key or the value.
     */
    simpleMap = new ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK, true);
    Map<Integer, Integer> reverseMap = new ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK,
            true);
    Integer foo = new Integer(32);
    bar = new Integer(42);
    simpleMap.put(foo, bar);
    reverseMap.put(bar, foo);
    Runtime.getRuntime().gc();
    assertEquals(1, simpleMap.size());
    assertEquals(1, reverseMap.size());
    bar = null;
    Runtime.getRuntime().gc();
    assertEquals(0, simpleMap.size());
    assertEquals(0, reverseMap.size());
}

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From source file:org.apache.myfaces.ext202patch.application.viewstate.SerializedViewCollection.java

/**
 * @return old serialized views map//from w w w.j av  a 2s . c  o  m
 */
@SuppressWarnings("unchecked")
protected Map<Object, Object> getOldSerializedViewsMap() {
    FacesContext context = FacesContext.getCurrentInstance();
    if (_oldSerializedViews == null && context != null) {
        String cacheMode = getCacheOldViewsInSessionMode(context);
        if (ServerSideStateCacheImpl.CACHE_OLD_VIEWS_IN_SESSION_MODE_WEAK.equals(cacheMode)) {
            _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.WEAK, AbstractReferenceMap.WEAK, true);
        } else if (ServerSideStateCacheImpl.CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT_WEAK.equals(cacheMode)) {
            _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.WEAK, true);
        } else if (ServerSideStateCacheImpl.CACHE_OLD_VIEWS_IN_SESSION_MODE_SOFT.equals(cacheMode)) {
            _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.SOFT, true);
        } else if (ServerSideStateCacheImpl.CACHE_OLD_VIEWS_IN_SESSION_MODE_HARD_SOFT.equals(cacheMode)) {
            _oldSerializedViews = new ReferenceMap(AbstractReferenceMap.HARD, AbstractReferenceMap.SOFT);
        }
    }

    return _oldSerializedViews;
}

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From source file:org.seasar.mayaa.impl.engine.PageImpl.java

protected Map getBeginRenderListeners() {
    synchronized (this) {
        if (_beginRenderListeners == null) {
            _beginRenderListeners = new ReferenceMap(AbstractReferenceMap.SOFT, AbstractReferenceMap.WEAK,
                    true);/*from  w w w. ja  v  a 2 s .c o  m*/
        }
    }
    return _beginRenderListeners;
}

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