Example usage for java.lang.ref SoftReference get

List of usage examples for java.lang.ref SoftReference get

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Introduction

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

Prototype

public T get()

Source Link

Document

Returns this reference object's referent.

Usage

From source file:org.orbeon.oxf.util.SoftReferenceObjectPool.java

/**
 * <p>Borrow an object from the pool.  If there are no idle instances available in the pool, the configured
 * factory's {@link PoolableObjectFactory#makeObject()} method is invoked to create a new instance.</p>
 *
 * <p>All instances are {@link PoolableObjectFactory#activateObject(Object) activated} and
 * {@link PoolableObjectFactory#validateObject(Object) validated} before being returned by this
 * method.  If validation fails or an exception occurs activating or validating an idle instance,
 * the failing instance is {@link PoolableObjectFactory#destroyObject(Object) destroyed} and another
 * instance is retrieved from the pool, validated and activated.  This process continues until either the
 * pool is empty or an instance passes validation.  If the pool is empty on activation or
 * it does not contain any valid instances, the factory's <code>makeObject</code> method is used
 * to create a new instance.  If the created instance either raises an exception on activation or
 * fails validation, <code>NoSuchElementException</code> is thrown. Exceptions thrown by <code>MakeObject</code>
 * are propagated to the caller; but other than <code>ThreadDeath</code> or <code>VirtualMachineError</code>,
 * exceptions generated by activation, validation or destroy methods are swallowed silently.</p>
 *
 * @throws NoSuchElementException if a valid object cannot be provided
 * @throws IllegalStateException if invoked on a {@link #close() closed} pool
 * @throws Exception if an exception occurs creating a new instance
 * @return a valid, activated object instance
 *//*w  ww.j  a va2  s  .c om*/
@Override
public synchronized T borrowObject() throws Exception {
    assertOpen();
    T obj = null;
    boolean newlyCreated = false;
    while (null == obj) {
        if (_pool.isEmpty()) {
            if (null == _factory) {
                throw new NoSuchElementException();
            } else {
                newlyCreated = true;
                obj = _factory.makeObject();
            }
        } else {
            SoftReference<T> ref = _pool.remove(_pool.size() - 1);
            obj = ref.get();
            ref.clear(); // prevent this ref from being enqueued with refQueue.
        }
        if (null != _factory && null != obj) {
            try {
                _factory.activateObject(obj);
                if (!_factory.validateObject(obj)) {
                    throw new Exception("ValidateObject failed");
                }
            } catch (Throwable t) {
                PoolUtils.checkRethrow(t);
                try {
                    _factory.destroyObject(obj);
                } catch (Throwable t2) {
                    PoolUtils.checkRethrow(t2);
                    // Swallowed
                } finally {
                    obj = null;
                }
                if (newlyCreated) {
                    throw new NoSuchElementException(
                            "Could not create a validated object, cause: " + t.getMessage());
                }
            }
        }
    }
    _numActive++;
    return obj;
}

From source file:smartparking.smartparking.util.ImageDownloader.java

/**
 * @param url The URL of the image that will be retrieved from the cache.
 * @return The cached bitmap or null if it was not found.
 *//*from   ww w .j av a 2  s  .c  o m*/
private Bitmap getBitmapFromCache(String url) {
    // First try the hard reference cache
    synchronized (sHardBitmapCache) {
        final Bitmap bitmap = sHardBitmapCache.get(url);
        if (bitmap != null) {
            // Bitmap found in hard cache
            // Move element to first position, so that it is removed last
            sHardBitmapCache.remove(url);
            sHardBitmapCache.put(url, bitmap);
            return bitmap;
        }
    }
    // Then try the soft reference cache
    SoftReference<Bitmap> bitmapReference = sSoftBitmapCache.get(url);
    if (bitmapReference != null) {
        final Bitmap bitmap = bitmapReference.get();
        if (bitmap != null) {
            // Bitmap found in soft cache
            return bitmap;
        } else {
            // Soft reference has been Garbage Collected
            sSoftBitmapCache.remove(url);
        }
    }
    return null;
}

From source file:org.mumod.util.ImageManager.java

public Bitmap get(String url) {
    SoftReference<Bitmap> ref;
    Bitmap bitmap;/*w w  w  .j a  v  a  2s  . c  om*/

    // Look in memory first.
    synchronized (this) {
        ref = mCache.get(url);
    }

    if (ref != null) {
        bitmap = ref.get();

        if (bitmap != null) {
            return bitmap;
        }
    }

    // Now try file.
    bitmap = lookupFile(url);

    if (bitmap != null) {
        synchronized (this) {
            mCache.put(url, new SoftReference<Bitmap>(bitmap));
        }

        return bitmap;
    }

    if (MustardApplication.DEBUG)
        Log.i(TAG, "Image is missing: " + url);
    return null;
}

From source file:com.guang.eunormia.common.cache.DefaultLocalCache.java

@Override
public V put(K key, V value, int TTL) {
    SoftReference<V> result = getCache(key).put(key, new SoftReference<V>(value));

    Calendar calendar = Calendar.getInstance();
    calendar.add(Calendar.SECOND, TTL);
    expiryCache.put(key, calendar.getTime().getTime());

    return result == null ? null : result.get();
}

From source file:ma.glasnost.orika.test.perf.MultiThreadedTestCase.java

/**
 * Since the contract for SoftReference states that all soft references will
 * be cleared by the garbage collector before OOME is thrown, we allocate
 * dummy bytes until we reach OOME.//  w  ww  .j  a v a 2  s . c o  m
 */
private void forceClearSoftAndWeakReferences() {

    SoftReference<Object> checkReference = new SoftReference<Object>(new Object());
    Assert.assertNotNull(checkReference.get());
    try {
        List<byte[]> byteBucket = new ArrayList<byte[]>();
        for (int i = 0; i < Integer.MAX_VALUE; ++i) {
            int available = (int) Math.min((long) Integer.MAX_VALUE, Runtime.getRuntime().maxMemory());
            byteBucket.add(new byte[available]);
        }
    } catch (Throwable e) {
        // Ignore OME; soft references should now have been cleared
        Assert.assertNull(checkReference.get());
    }

}

From source file:codelovers.test.androidyoutubeplayer.ImageDownloader.java

/**
 * @param url The URL of the image that will be retrieved from the cache.
 * @return The cached bitmap or null if it was not found.
 *//*w ww.  j ava 2s.  c om*/
private Bitmap getBitmapFromCache(String url) {
    // First try the hard reference cache
    synchronized (mHardBitmapCache) {
        final Bitmap bitmap = mHardBitmapCache.get(url);
        if (bitmap != null) {
            // Bitmap found in hard cache
            // Move element to first position, so that it is removed last
            mHardBitmapCache.remove(url);
            mHardBitmapCache.put(url, bitmap);
            return bitmap;
        }
    }

    // Then try the soft reference cache
    SoftReference<Bitmap> bitmapReference = sSoftBitmapCache.get(url);
    if (bitmapReference != null) {
        final Bitmap bitmap = bitmapReference.get();
        if (bitmap != null) {
            // Bitmap found in soft cache
            return bitmap;
        } else {
            // Soft reference has been Garbage Collected
            sSoftBitmapCache.remove(url);
        }
    }

    return null;
}

From source file:org.teiid.olingo.web.ODataFilter.java

public void internalDoFilter(ServletRequest request, ServletResponse response, FilterChain chain)
        throws IOException, ServletException, TeiidProcessingException {

    HttpServletRequest httpRequest = (HttpServletRequest) request;

    String proxyURI = this.proxyBaseURI;
    if (proxyURI != null) {
        httpRequest = new ProxyHttpServletRequest(httpRequest, proxyURI);
    }//from ww  w  . java 2  s. c o  m

    VDBKey key = null;
    String vdbName = null;
    String version = null;
    String modelName = null;

    String uri = ((HttpServletRequest) request).getRequestURI().toString();
    String fullURL = ((HttpServletRequest) request).getRequestURL().toString();
    if (uri.startsWith("/odata4/static/") || uri.startsWith("/odata4/keycloak/")) { //$NON-NLS-1$ //$NON-NLS-2$
        chain.doFilter(httpRequest, response);
        return;
    }

    String contextPath = httpRequest.getContextPath();
    String baseURI = fullURL.substring(0, fullURL.indexOf(contextPath));

    int endIdx = uri.indexOf('/', contextPath.length() + 1);
    int beginIdx = contextPath.length() + 1;

    if (contextPath.equals("/odata4")) { //$NON-NLS-1$
        if (endIdx == -1) {
            throw new TeiidProcessingException(ODataPlugin.Event.TEIID16020,
                    ODataPlugin.Util.gs(ODataPlugin.Event.TEIID16020));
        }
        baseURI = baseURI + "/odata4"; //$NON-NLS-1$
        vdbName = uri.substring(beginIdx, endIdx);
        int modelIdx = uri.indexOf('/', endIdx + 1);
        if (modelIdx == -1) {
            modelName = uri.substring(endIdx + 1).trim();
            if (modelName.isEmpty()) {
                throw new TeiidProcessingException(ODataPlugin.Event.TEIID16019,
                        ODataPlugin.Util.gs(ODataPlugin.Event.TEIID16019));
            }
        } else {
            modelName = uri.substring(endIdx + 1, modelIdx);
        }

        contextPath = contextPath + "/" + vdbName + "/" + modelName; //$NON-NLS-1$ //$NON-NLS-2$

        vdbName = vdbName.trim();
        if (vdbName.isEmpty()) {
            throw new TeiidProcessingException(ODataPlugin.Event.TEIID16008,
                    ODataPlugin.Util.gs(ODataPlugin.Event.TEIID16008));
        }

    } else {
        if (this.initProperties.getProperty("vdb-name") == null) { //$NON-NLS-1$ 
            throw new TeiidProcessingException(ODataPlugin.Event.TEIID16018,
                    ODataPlugin.Util.gs(ODataPlugin.Event.TEIID16018));
        }

        vdbName = this.initProperties.getProperty("vdb-name"); //$NON-NLS-1$
        version = this.initProperties.getProperty("vdb-version"); //$NON-NLS-1$

        if (endIdx == -1) {
            modelName = uri.substring(beginIdx).trim();
            if (modelName.isEmpty()) {
                throw new TeiidProcessingException(ODataPlugin.Util.gs(ODataPlugin.Event.TEIID16021));
            }
        } else {
            modelName = uri.substring(beginIdx, endIdx);
        }

        contextPath = contextPath + "/" + modelName; //$NON-NLS-1$
    }

    ContextAwareHttpSerlvetRequest contextAwareRequest = new ContextAwareHttpSerlvetRequest(httpRequest);
    contextAwareRequest.setContextPath(contextPath);
    httpRequest = contextAwareRequest;

    key = new VDBKey(vdbName, version);
    if (key.isAtMost()) {
        if (key.getVersion() != null) {
            throw new TeiidProcessingException(ODataPlugin.Event.TEIID16044,
                    ODataPlugin.Util.gs(ODataPlugin.Event.TEIID16044, key));
        }
        key = new VDBKey(vdbName, "1"); //$NON-NLS-1$ //legacy behavior, default to version 1
    }

    SoftReference<OlingoBridge> ref = this.contextMap.get(key);
    OlingoBridge context = null;
    if (ref != null) {
        context = ref.get();
    }

    if (context == null) {
        context = new OlingoBridge();
        ref = new SoftReference<OlingoBridge>(context);
        this.contextMap.put(key, ref);
    }

    Client client = buildClient(key.getName(), key.getVersion(), this.initProperties);
    try {
        Connection connection = client.open();
        registerVDBListener(client, connection);
        ODataHttpHandler handler = context.getHandler(baseURI, client, modelName);
        httpRequest.setAttribute(ODataHttpHandler.class.getName(), handler);
        httpRequest.setAttribute(Client.class.getName(), client);
        chain.doFilter(httpRequest, response);
    } catch (SQLException e) {
        throw new TeiidProcessingException(e);
    } finally {
        try {
            client.close();
        } catch (SQLException e) {
            //ignore
        }
    }
}

From source file:com.twapime.app.util.AsyncImageLoader.java

/**
* @param imageUrl/*from   w  ww  . j ava  2  s.c om*/
* @return
*/
private Drawable getDrawableFromCache(String imageUrl) {
    synchronized (hardCache) {
        Drawable drawable = hardCache.get(imageUrl);
        //
        if (drawable != null) {
            // Drawable found in hard cache
            // Move element to first position, so that it is removed last
            hardCache.remove(imageUrl);
            hardCache.put(imageUrl, drawable);
            //
            return drawable;
        }
    }
    //
    SoftReference<Drawable> reference = softCache.get(imageUrl);
    //
    if (reference != null) {
        Drawable drawable = reference.get();
        //
        if (drawable != null) {
            return drawable;
        }
    }
    //
    return null;
}

From source file:adapters.images.ImageDownloader.java

/**
 * @param url The URL of the image that will be retrieved from the cache.
 * @return The cached bitmap or null if it was not found.
 *///w  w  w. java2s .c o  m
private Bitmap getBitmapFromCache(String url) {
    // First try the hard reference cache
    synchronized (sHardBitmapCache) {
        final Bitmap bitmap = sHardBitmapCache.get(url);
        if (bitmap != null) {
            // Bitmap found in hard cache
            // Move element to first position, so that it is removed last
            sHardBitmapCache.remove(url);
            sHardBitmapCache.put(url, bitmap);
            return bitmap;
        }
    }

    // Then try the soft reference cache
    SoftReference<Bitmap> bitmapReference = sSoftBitmapCache.get(url);
    if (bitmapReference != null) {
        final Bitmap bitmap = bitmapReference.get();
        if (bitmap != null) {
            // Bitmap found in soft cache
            return bitmap;
        } else {
            // Soft reference has been Garbage Collected
            sSoftBitmapCache.remove(url);
        }
    }

    return null;
}

From source file:kr.co.WhenWhereWho3.ImageDownloader.java

/**
 * @param url The URL of the image that will be retrieved from the cache.
 * @return The cached bitmap or null if it was not found.
 *//* w  w  w . j a v  a 2  s . c o m*/
private Bitmap getBitmapFromCache(String url) {
    // First try the hard reference cache
    //    (    )
    synchronized (sHardBitmapCache) {
        //       
        final Bitmap bitmap = sHardBitmapCache.get(url);
        //     
        if (bitmap != null) {
            // Bitmap found in hard cache
            // Move element to first position, so that it is removed last
            //   
            sHardBitmapCache.remove(url);
            //       . ?? 
            //         
            sHardBitmapCache.put(url, bitmap);
            return bitmap;
        }
    }

    // Then try the soft reference cache
    SoftReference<Bitmap> bitmapReference = sSoftBitmapCache.get(url);
    if (bitmapReference != null) {
        final Bitmap bitmap = bitmapReference.get();
        if (bitmap != null) {
            // Bitmap found in soft cache
            return bitmap;
        } else {
            // Soft reference has been Garbage Collected
            sSoftBitmapCache.remove(url);
        }
    }

    return null;
}