Examples of javax.cache.Cache$EntryProcessor

javax.cache.Cache
Allows execution of code which may mutate a cache entry with exclusive access (including reads) to that entry.
Any mutations will not take effect till after the processor has completed; if an exception thown inside the processor, no changes will be made to the cache.
This enables a way to perform compound operations without transactions involving a cache entry atomically. Such operations may include mutations.
The mutations can be potentially done in place avoiding expensive network transfers. An example is a value which is a list and you simply want to append a new element to it.
An entry processor cannot invoke any cache operations, including processor operations.
If executed in a JVM remote from the one invoke was called in, an EntryProcessor equal to the local one will execute the invocation. For remote to execution to succeed, the EntryProcessor implementation class must be in the excecuting class loader as must K and V if {@link Cache.MutableEntry#getKey()} or {@link Cache.MutableEntry#getValue()}is invoked. @param < K> the type of keys maintained by this cache @param < V> the type of cached values @author Greg Luck @author Yannis Cosmadopoulos

   * Returns object in cache
   * @param key
   * @return
   */
  public static Object get(Object key){
    Cache cache = getCache();
    
    if (cache != null) return cache.get(key);
    
    return null;
  }

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   * @param key
   * @param value
   */
  @SuppressWarnings("unchecked")
  public static void put(Object key, Object value){
    Cache cache = getCache();
    
    if (cache != null) cache.put(key, value);
  }

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    if (cache != null) cache.put(key, value);
  }
  
  public static void remove(Object key){
    Cache cache = getCache();
    if (cache != null) cache.remove(key);
  }

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    if (cache != null) cache.remove(key);
  }
  
  private static Cache getCache(){
    //find in cache first
        Cache cache = null;
        Map<Object,Object> props = new HashMap<Object,Object>();
        props.put(GCacheFactory.EXPIRATION_DELTA, 3600 * 4); //4 hours
        try {
      cache = CacheManager.getInstance().getCacheFactory().createCache(props);
    } catch (CacheException e) {

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    @SuppressWarnings({ "unchecked", "serial" })
    public void save(CacheableByteArrayOutputStream o) {
      if (data != null) {
        try {
          Cache cache = CacheManager.getInstance().getCacheFactory().createCache(new HashMap() { {
            put(GCacheFactory.EXPIRATION_DELTA, 3600); 
          }});
          size = data.size();      
          int storedBytes = 0;
          String sufix = "";
          while(storedBytes < size) {
            byte[] buff = new byte[Math.min(MEMCACHE_LIMIT, size - storedBytes)];
            storedBytes += data.read(buff);
            cache.put(fname + sufix, buff);
            sufix += "X";
          }
          data = null;
        } catch (Exception e) {
          e.printStackTrace();

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    }


    private byte[] getData() {
      if (data == null) {
        try {
          Cache cache = CacheManager.getInstance().getCacheFactory().createCache(Collections.emptyMap());
          int pos = 0;
          byte[] pData = new byte[size];
          byte[] cacheBuf = null;
          String suffix = "";
          while ((cacheBuf = (byte[]) cache.get(fname + suffix)) != null) {
            System.arraycopy(cacheBuf, 0, pData, pos, cacheBuf.length);
            pos += cacheBuf.length;
            suffix += "X";
          }
          return pData;

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  @SuppressWarnings("unchecked")
  @Override
  public Page get(String name) {


    Cache cache;


    try {
      cache = CacheManager.getInstance().getCacheFactory()
          .createCache(Collections.emptyMap());
      // Get the value from the cache.
      Page value = (Page) cache.get(name);
      if (value != null) {
        return value;
      }
    } catch (CacheException e) {
      // ...
    }


    DatastoreService datastore = DatastoreServiceFactory
        .getDatastoreService();
    Page page = new Page(name);
    try {
      Entity e = datastore.get(KeyFactory.createKey(
          Page.class.getSimpleName(), name));
      page = new Page(e.getKey().getName(),
          ((Text) e.getProperty(Page.CONTENT)).getValue());
      // Text style = (Text) e.getProperty(Page.STYLE);
      // if (style != null) {
      // page.setStyle(style.getValue());
      // }
      Text diff = (Text) e.getProperty(Page.DIFF);
      if (diff != null) {
        page.setDiff(diff.getValue());
      }


    } catch (EntityNotFoundException e) {
      // e.printStackTrace();
    }
    try {
      cache = CacheManager.getInstance().getCacheFactory()
          .createCache(Collections.emptyMap());
      cache.put(name, page);
    } catch (CacheException e) {
      // ...
    }


    return page;

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        datastore.put(history);
      }


      try {
        Cache cache = CacheManager.getInstance().getCacheFactory()
            .createCache(Collections.emptyMap());
        cache.put(p.getName(), p);
      } catch (CacheException e) {
        // ...
      }


    } catch (UnsupportedEncodingException e) {

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  }


  @SuppressWarnings("unchecked")
  @Test
  public void testMemCacheHashMap() throws CacheException {
    Cache cache = CacheManager.getInstance().getCacheFactory()
        .createCache(Collections.emptyMap());
    String name = "name";
    HashMap<String, String> map = new HashMap<String, String>();
    map.put("", "");
    cache.put(name, map);
  }

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      String url_with_hash_fragment = uri
          + rewriteQueryString(queryString);


      // check memcache first


      Cache cache = null;
      String pageSource = null;


      Map<Object, Object> props = new HashMap<Object, Object>();
      props.put(GCacheFactory.EXPIRATION_DELTA, new Integer(3600));


      try {
        cache = CacheManager.getInstance().getCacheFactory()
            .createCache(props);
        // Get the value from the cache.
        pageSource = (String) cache.get(url_with_hash_fragment);
      } catch (CacheException e) {
        // ...
      }


      // ////////////
      if (pageSource == null) {


        // use the headless browser to obtain an HTML snapshot
        URL url = new URL(SCHEME, domain, port, url_with_hash_fragment);
        this.webClient.getOptions().setTimeout(0);
        HtmlPage page = null;


        try {
          page = this.webClient.getPage(url);


          // gae hack because its single threaded
          this.webClient.getJavaScriptEngine().pumpEventLoop(
              PUMP_TIME);


        } catch (IOException ioe) {
          Logger.getLogger("")
              .warning(
                  "Failed to let google index "
                      + url
                      + " Work on increasing server side performance.");
        }
        if (page != null) {
          pageSource = page.asXml();
        }
      }


      ServletOutputStream out = response.getOutputStream();
      out.println(new String(pageSource));
      out.flush();


      // update cache
      if (cache != null) {
        cache.put(url_with_hash_fragment, pageSource);
      }
    } else {
      try {
        /*
         * not an _escaped_fragment_ URL, so move up the chain of

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