Examples of javax.cache.Cache

javax.cache.Cache
A Cache provides storage of data for later fast retrieval.
This Cache interface is based on {@link java.util.concurrent.ConcurrentMap} with some modifications forfast distributed performance.
A Cache does not allow null keys or values. Attempts to store a null value or to use a null key either in a get or put operation will result in a {@link NullPointerException}.
Caches use generics throughout providing a level of type safety akin to the collections package.
Cache implements {@link Iterable} for {@link Cache.Entry}, providing support for simplified iteration. However iteration should be used with caution. It is an O(n) operation and may be slow on large or distributed caches.
The Cache API also provides:
- read-through caching
- write-through caching
- cache loading
- cache listeners
- statistics
- lifecycle
- configuration
Though not visible in the Cache interface caches may be optionally transactional.
User programs may make use of caching annotations to interact with a cache.
A simple example of how to use a cache is:
```
 String cacheName = "sampleCache"; CacheManager cacheManager = Caching.getCacheManager(); Cache<Integer, Date> cache = cacheManager.getCache(cacheName); if (cache == null) { cache = cacheManager.<Integer,Date>createCacheBuilder(cacheName).build(); } Date value1 = new Date(); Integer key = 1; cache.put(key, value1); Date value2 = cache.get(key); 
```
Concurrency
Concurrency is described as if there exists a locking mechanism on each key. If a cache operation gets an exclusive lock on a key, then all subsequent operations on that key will block until that lock is released. The consequences are that operations performed by a thread happen-before read or mutation operations performed by another thread, including threads in different Java Virtual Machines. @param < K> the type of keys maintained by this cache @param < V> the type of cached values @author Greg Luck @author Yannis Cosmadopoulos @since 1.0

        session.setAttribute("success", "Action success !");
        req.setAttribute("siteConfig", siteConfig);
        req.getRequestDispatcher("/admin/form_system.jsp").forward(req,
            resp);
      } else if (obj != null && obj.equals("cache")) {
        Cache cache = CacheManager.getInstance().getCacheFactory()
            .createCache(Collections.emptyMap());
        cache.clear();
        session.setAttribute("success", "Action success !");
        req.getRequestDispatcher("/admin/form_cache.jsp").forward(req,
            resp);
      } else {
        resp.sendError(4004, "Invalid parameter !");

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  // GETTING DATA FROM MEMCACHE


  @SuppressWarnings("unchecked")
  public static <K, T extends Serializable> T get(K key) {
    try {
      Cache cache = CacheManager.getInstance().getCacheFactory()
          .createCache(Collections.emptyMap());
      return (T) cache.get(key);
    } catch (InvalidValueException ex) {
      Logger.get().log(Level.WARNING, null, ex);
      return null;
    } catch (CacheException ex) {
      Logger.get().log(Level.SEVERE, null, ex);

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    Map props = new HashMap();
    props.put(GCacheFactory.EXPIRATION_DELTA_MILLIS, expirationDeltaMillis);


    try {
      Cache cache = CacheManager.getInstance().getCacheFactory()
          .createCache(props);
      cache.put(key, value);
    } catch (CacheException ex) {
      Logger.get().log(Level.SEVERE, null, ex);
    }
  }

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  @SuppressWarnings({ "unchecked", "rawtypes" })
  public static <K, T extends Serializable> void put(K key, T value) {
    Map props = Collections.emptyMap();


    try {
      Cache cache = CacheManager.getInstance().getCacheFactory()
          .createCache(props);
      cache.put(key, value);
    } catch (CacheException ex) {
      Logger.get().log(Level.SEVERE, null, ex);
    }
  }

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  // REMOVE A MEMCACHE ENTRY


  public static <K> void remove(K key) {
    try {
      Cache cache = CacheManager.getInstance().getCacheFactory()
          .createCache(Collections.emptyMap());
      cache.remove(key);
    } catch (CacheException ex) {
      Logger.get().log(Level.SEVERE, null, ex);
    }
  }

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  // FLUSHING MEMCACHE DATA


  public static void flush() {
    try {
      Cache cache = CacheManager.getInstance().getCacheFactory()
          .createCache(Collections.emptyMap());
      cache.clear();
    } catch (CacheException ex) {
      Logger.get().log(Level.SEVERE, null, ex);
    }
  }

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    // consultar si el resultado est� en la cache
    try {
      Map<Integer, Integer> props = new HashMap<Integer, Integer>();
      props.put(GCacheFactory.EXPIRATION_DELTA, 1800);
      CacheFactory cacheFactory = CacheManager.getInstance().getCacheFactory();
      Cache cache = cacheFactory.createCache(Collections.emptyMap());


      List<FeaturedArticle> articles = (List<FeaturedArticle>) cache.get(FEATURED_ARTICLES_KEY);


      if (articles == null) {
        // si no esta, buscar los 5 art�culos con m�s comentarios
        articles = searchFeaturedArticles();
        // guardar el resultado en la cache
        cache.put(FEATURED_ARTICLES_KEY, articles);
      }
      return articles;
    } catch (CacheException e) {
      System.out.println(e);
      return Collections.EMPTY_LIST;

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    }


    @SuppressWarnings("unchecked")
    public void addCache(String name) {
      cacheNames.add(name);
      Cache cache = mock(Cache.class);
      given(cache.getName()).willReturn(name);
      given(cacheManager.getCache(name)).willReturn(cache);
    }

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    @Test
    public void testCachesDestroy() {
        CacheManager cacheManager = cachingProvider1.getCacheManager();
        CacheManager cacheManager2 = cachingProvider2.getCacheManager();
        MutableConfiguration configuration = new MutableConfiguration();
        final Cache c1 = cacheManager.createCache("c1", configuration);
        final Cache c2 = cacheManager2.getCache("c1");
        c1.put("key", "value");
        cacheManager.destroyCache("c1");
        assertTrueEventually(new AssertTask() {
            @Override
            public void run()
                    throws Exception {
                try {
                    c2.get("key");
                    throw new AssertionError("get should throw IllegalStateException");
                } catch (IllegalStateException e) {
                    //ignored as expected
                }
            }

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    @Test
    public void testCachesDestroyFromOtherManagers() {
        CacheManager cacheManager = cachingProvider1.getCacheManager();
        CacheManager cacheManager2 = cachingProvider2.getCacheManager();
        MutableConfiguration configuration = new MutableConfiguration();
        final Cache c1 = cacheManager.createCache("c1", configuration);
        final Cache c2 = cacheManager2.createCache("c2", configuration);
        c1.put("key", "value");
        c2.put("key", "value");
        cacheManager.close();
        assertTrueAllTheTime(new AssertTask() {
            @Override
            public void run()
                    throws Exception {
                c2.get("key");
            }
        }, 10);
    }

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Examples of javax.cache.Cache

Concurrency

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