Examples of java.lang.ref.WeakReference

java.lang.ref.WeakReference
Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed. Weak references are most often used to implement canonicalizing mappings.
Suppose that the garbage collector determines at a certain point in time that an object is weakly reachable. At that time it will atomically clear all weak references to that object and all weak references to any other weakly-reachable objects from which that object is reachable through a chain of strong and soft references. At the same time it will declare all of the formerly weakly-reachable objects to be finalizable. At the same time or at some later time it will enqueue those newly-cleared weak references that are registered with reference queues. @version 1.19, 11/17/05 @author Mark Reinhold @since 1.2

    {
        private final WeakReference m_revision;


        private RevisionAsJarURL(BundleRevisionImpl revision)
        {
            m_revision = new WeakReference(revision);
        }

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        if (!Util.isAccessible(_method)) {
            _method.setAccessible(true);
        }


        _parameterTypes = parameterTypes;
        _target = new WeakReference(target);
    }

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    public void testDroppedThread() throws Exception {


        MultiThreadedHttpConnectionManager mthcm = new MultiThreadedHttpConnectionManager();
        HttpClient httpClient = createHttpClient(mthcm);
        WeakReference wr = new WeakReference(mthcm);


        GetMethod method = new GetMethod("/");
        httpClient.executeMethod(method);
        method.releaseConnection();


        mthcm = null;
        httpClient = null;
        method = null;
        
        System.gc();


        // this sleep appears to be necessary in order to give the JVM
        // time to clean up the miscellaneous pointers to the connection manager
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            fail("shouldn't be interrupted.");
        }


        Object connectionManager = wr.get();
        assertNull("connectionManager should be null", connectionManager);
    }

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        if(sinks == null) {
            sinks = new HashSet();
        }


        return sinks.add(new WeakReference(sink));
    }

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     * necessary
     */
    private CellPropertiesJFrame getCellPropertiesJFrame() {
        if (cellPropertiesFrameRef == null || cellPropertiesFrameRef.get() == null) {
            CellPropertiesJFrame cellPropertiesFrame = new CellPropertiesJFrame();
            cellPropertiesFrameRef = new WeakReference(cellPropertiesFrame);
            return cellPropertiesFrame;
        } else {
            return cellPropertiesFrameRef.get();
        }
    }

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        OCLHelper oclHelper = oclInstance.createOCLHelper();
        oclHelper.setContext(context());
        try {
          OCLExpression oclExpression = oclHelper.createQuery(body());
          oclQuery = oclInstance.createQuery(oclExpression);
          this.queryRef = new WeakReference(oclQuery);
          setStatus(IStatus.OK, null, null);
        } catch (ParserException e) {
          setStatus(IStatus.ERROR, e.getMessage(), e);
        }
      }

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        return true;
      }
      IGraphicalEditPart part = createEditPart(view);
      if (part != null) {
        if (isAllowCaching()) {
          cachedPart = new WeakReference(part);
          cachedView = new WeakReference(view);
        }
        return true;
      }
    }
    return false;

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                connection.setHttpConnectionManager(MultiThreadedHttpConnectionManager.this);
                numConnections++;
                hostPool.numConnections++;
        
                // add a weak reference to this connection
                referenceToHostConfig.put(new WeakReference(connection, referenceQueue),
                                          hostConfiguration);
            } else if (LOG.isDebugEnabled()) {
                if (hostPool.numConnections >= getMaxConnectionsPerHost()) {
                    LOG.debug("No connection allocated, host pool has already reached "
                        + "maxConnectionsPerHost, hostConfig=" + hostConfiguration

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                connection.close();


                // make sure this connection will not be cleaned up again when garbage 
                // collected
                for (Iterator iter = referenceToHostConfig.keySet().iterator(); iter.hasNext();) {
                    WeakReference connectionRef = (WeakReference) iter.next();
                    if (connectionRef.get() == connection) {
                        iter.remove();
                        connectionRef.enqueue();
                        break;
                    }
                }
                
                HostConnectionPool hostPool = getHostPool(connectionConfiguration);

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   * that pass the supplied filter.
   * @see SinkFilter
   */
  public SinkTokenStream newSinkTokenStream(SinkFilter filter) {
    SinkTokenStream sink = new SinkTokenStream(this.cloneAttributes(), filter);
    this.sinks.add(new WeakReference(sink));
    return sink;
  }

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