Examples of org.jboss.cache.loader.CacheLoader

org.jboss.cache.loader.CacheLoader
A {@link org.jboss.cache.loader.CacheLoader} implementation persists and load keys to and fromsecondary storage, such as a database or filesystem. Typically, implementations store a series of keys and values (an entire {@link Map}) under a single {@link Fqn}. Loading and saving properties of an entire {@link Map} should be atomic.
Lifecycle: First an instance of the loader is created, then the configuration ( {@link #setConfig(org.jboss.cache.config.CacheLoaderConfig.IndividualCacheLoaderConfig)}) and cache ( {@link #setCache(CacheSPI)}) are set. After this, {@link #create()} is called.Then {@link #start()} is called. When re-deployed, {@link #stop()} will becalled, followed by another {@link #start()}. Finally, when shut down, {@link #destroy()} is called, after which the loader is unusable.
An {@link org.jboss.cache.loader.AbstractCacheLoader} is provided as a convenient starting placewhen implementing your own {@link org.jboss.cache.loader.CacheLoader}.
It is important to note that all implementations are thread safe, as concurrent reads and writes, potentially even to the same {@link Fqn}, are possible.
@author Manik Surtani (manik AT jboss DOT org) @see CacheSPI @see org.jboss.cache.config.CacheLoaderConfig.IndividualCacheLoaderConfig @see org.jboss.cache.loader.AbstractCacheLoader @since 2.0.0

      if (clm == null)
      {
         LOG.error("The CacheLoaderManager cannot be found");
         return;
      }
      CacheLoader currentCL = clm.getCacheLoader();
      if (currentCL == null)
      {
         LOG.error("The CacheLoader cannot be found");
         return;
      }

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      if (clm == null)
      {
         LOG.error("The CacheLoaderManager cannot be found");
         return null;
      }
      CacheLoader currentCL = clm.getCacheLoader();
      if (currentCL == null)
      {
         LOG.error("The CacheLoader cannot be found");
         return null;
      }

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      if (clm == null)
      {
         LOG.error("The CacheLoaderManager cannot be found");
         return;
      }
      CacheLoader currentCL = clm.getCacheLoader();
      if (currentCL == null)
      {
         LOG.error("The CacheLoader cannot be found");
         return;
      }

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   protected void integratePersistentState(ObjectInputStream in, Fqn targetFqn) throws Exception
   {
      if (trace) log.trace("Reading persistent state from stream");
      CacheLoaderManager loaderManager = cache.getCacheLoaderManager();
      CacheLoader loader = loaderManager == null ? null : loaderManager.getCacheLoader();
      if (loader == null)
      {
         if (log.isTraceEnabled())
         {
            log.trace("cache loader is null, will not attempt to integrate persistent state");
         }
      }
      else
      {


         if (log.isTraceEnabled())
         {
            log.trace("integrating persistent state using " + loader.getClass().getName());
         }


         boolean persistentSet = false;
         try
         {
            if (targetFqn.isRoot())
            {
               loader.storeEntireState(in);
            }
            else
            {
               loader.storeState(targetFqn, in);
            }
            persistentSet = true;
         }
         catch (ClassCastException cce)
         {
            log.error("Failed integrating persistent state. One of cacheloaders is not"
                  + " adhering to state stream format. See JBCACHE-738.");
            throw cce;
         }
         finally
         {
            if (!persistentSet)
            {
               log.warn("persistent state integration failed, removing all nodes from loader");
               loader.remove(targetFqn);
            }
            else
            {
               if (log.isTraceEnabled())
               {

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      if (clm == null)
      {
         LOG.error("The CacheLoaderManager cannot be found");
         return;
      }
      CacheLoader currentCL = clm.getCacheLoader();
      if (currentCL == null)
      {
         LOG.error("The CacheLoader cannot be found");
         return;
      }

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      assertNull(loader.get(fqn));
   }


   public void testCacheLoadOnTree() throws Exception
   {
      CacheLoader loader = null;
      try
      {
         CacheSPI<Object, Object> cache = createCacheWithLoader();
         loader = cache.getCacheLoaderManager().getCacheLoader();


         TransactionManager mgr = cache.getTransactionManager();
         Transaction tx;


         // make sure the fqn is not in cache
         assertNull(cache.getNode(fqn));


         // put something in the loader and make sure all tx's can see it
         loader.put(fqn, key, value);


         // start the 1st tx
         mgr.begin();
         tx = mgr.getTransaction();
         assertEquals(value, cache.get(fqn, key));
         mgr.suspend();


         // start a new tx
         mgr.begin();
         assertEquals(value, cache.get(fqn, key));
         mgr.commit();


         mgr.resume(tx);
         assertEquals(value, cache.get(fqn, key));
         mgr.commit();
      }
      finally
      {
         // cleanup
         if (loader != null) loader.remove(fqn);
      }
   }

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   public void testCacheStoring() throws Exception
   {
      Transaction tx;
      CacheSPI<Object, Object> cache = createCacheWithLoader();
      CacheLoader loader = cache.getCacheLoaderManager().getCacheLoader();


      // test the cache ...
      TransactionManager mgr = cache.getTransactionManager();
      assertNull(mgr.getTransaction());
      mgr.begin();
      cache.put(fqn, key, value);
      mgr.commit();


      assertEquals(value, cache.get(fqn, key));


      //now lets see if the state has been persisted in the cache loader
      assertEquals(value, loader.get(fqn).get(key));




      mgr.begin();
      cache.removeNode(fqn);
      mgr.commit();


      assertNull(cache.get(fqn, key));
      //now lets see if the state has been persisted in the cache loader
      assertNull(loader.get(fqn));


      mgr.begin();
      cache.put(fqn, key, value);
      tx = mgr.getTransaction();
      mgr.suspend();


      // lets see what we've got halfway within a tx
      assertNull(cache.get(fqn, key));
      assertNull(loader.get(fqn));


      mgr.resume(tx);
      mgr.commit();


      // and after committing...
      assertEquals(value, cache.get(fqn, key));
      assertEquals(value, loader.get(fqn).get(key));


      // clean up loader
      loader.remove(fqn);
   }

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   public void testCacheStoringImplicitTx() throws Exception
   {
      CacheSPI<Object, Object> cache = createCacheWithLoader();
      CacheLoader loader = cache.getCacheLoaderManager().getCacheLoader();


      // test the cache ...
      TransactionManager mgr = cache.getTransactionManager();
      assertNull(mgr.getTransaction());
      cache.put(fqn, key, value);


      assertEquals(value, cache.get(fqn, key));


      //now lets see if the state has been persisted in the cache loader
      assertEquals(value, loader.get(fqn).get(key));




      cache.removeNode(fqn);


      assertNull(cache.get(fqn, key));
      //now lets see if the state has been persisted in the cache loader
      assertNull(loader.get(fqn));


      cache.put(fqn, key, value);


      assertEquals(value, cache.get(fqn, key));
      assertEquals(value, loader.get(fqn).get(key));


      // clean up loader
      loader.remove(fqn);
   }

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   }


   public void testCacheStoringImplicitTxOptionOverride() throws Exception
   {
      CacheSPI<Object, Object> cache = createCacheWithLoader();
      CacheLoader loader = cache.getCacheLoaderManager().getCacheLoader();
      Option option = new Option();
      option.setCacheModeLocal(true);
      cache.getInvocationContext().setOptionOverrides(option);
      cache.put(fqn, key, value);
      assertEquals(value, cache.get(fqn, key));
      //now lets see if the state has been persisted in the cache loader
      assertNotNull(loader.get(fqn));
      assertNotNull(value, loader.get(fqn).get(key));
      cache.removeNode(fqn);
   }

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   public void testCacheLoading() throws Exception
   {
      CacheSPI<Object, Object> cache = createCacheWithLoader();
      CacheLoader loader = cache.getCacheLoaderManager().getCacheLoader();


      assertNull(cache.get(fqn, key));


      // put something in the loader
      loader.put(fqn, key, value);
      assertEquals(value, loader.get(fqn).get(key));


      // test that this can now be accessed by the cache
      assertEquals(value, cache.get(fqn, key));


      // clean up loader
      loader.remove(fqn);


      // what's in the cache now?  Should not ne null...
      assertNotNull(cache.get(fqn, key));
   }

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