Examples of org.apache.derby.iapi.services.cache.Cacheable

Package org.apache.derby.iapi.services.cache

Examples of org.apache.derby.iapi.services.cache.Cacheable

org.apache.derby.iapi.services.cache.Cacheable
Any object that implements this interface can be cached using the services of the CacheManager/CacheFactory. In addition to implementing this interface the class must be public and it must have a public no-arg constructor. This is because the cache manager will construct objects itself and then set their identity by calling the setIdentity method.
A Cacheable object has five states:
While the object is kept it is guaranteed not to change identity. While it is unkept no-one outside of the cache manager can have a reference to the object. The cache manager returns kept objects and they return to the unkept state when all the current users of the object have released it.
It is required that the object can only move into a dirty state while it is kept.
MT - Mutable : thread aware - Calls to Cacheable method must only be made by the cache manager or the object itself. @see CacheManager @see CacheFactory @see Class#newInstance

  }


    private Object getPermissions( PermissionsDescriptor key) throws StandardException
    {
        // RESOLVE get a READ COMMITTED (shared) lock on the permission row
        Cacheable entry = getPermissionsCache().find( key);
        if( entry == null)
            return null;
        Object perms = entry.getIdentity();
        getPermissionsCache().release( entry);
        return perms;
    }

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   */
  private void removePermEntryInCache(PermissionsDescriptor perm)
    throws StandardException
  {
    // Remove cached permissions entry if present
    Cacheable cacheEntry = getPermissionsCache().findCached( perm);
    if (cacheEntry != null)
      getPermissionsCache().remove(cacheEntry);
  }

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  }


    private Object getPermissions( PermissionsDescriptor key) throws StandardException
    {
        // RESOLVE get a READ COMMITTED (shared) lock on the permission row
        Cacheable entry = getPermissionsCache().find( key);
        if( entry == null)
            return null;
        Object perms = entry.getIdentity();
        getPermissionsCache().release( entry);
        return perms;
    }

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            Object[] removeInfo = 
                            (Object[]) droppedTableStubInfo.get(logInstant);
            Object identity = removeInfo[1];
            //delete the entry in the container cache.
            Cacheable ccentry =  containerCache.findCached(identity);
            if(ccentry!=null)
              containerCache.remove(ccentry);


            //delete the stub we don't require it during recovery
                        synchronized( this)

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        stat.findFault++;


        return addEntry(item, key, false, (Object) null);
      }
        
      Cacheable entry = item.use();
      if (entry == null) {
        // item was not added by the other user successfully ...
        synchronized (this) {
          item.unkeep();
        }

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        stat.findCachedHit++;
      
      item.keepAfterSearch();
    }


    Cacheable entry = item.use();
    if (entry == null) {
      // item was not added by the other user successfully ...
      synchronized (this) {
        item.unkeep();
      }

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            System.out.println("memoryLeakTrace:Cache:" + name + " " + size());
        }
      }
    }


    Cacheable entry = addEntry(item, key, true, createParameter);
  
    if (SanityManager.DEBUG) {
      if (entry != null)
        SanityManager.ASSERT(item.getEntry() == entry);
    }

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  */
  private Cacheable addEntry(CachedItem item, Object key, boolean forCreate, Object createParameter)
    throws StandardException {


    Cacheable entry = null;
        long origEntrySize = 0;
        if( useByteCount)
            origEntrySize = getItemSize( item);


    try
    {
      if (SanityManager.DEBUG) {
        if (SanityManager.DEBUG_ON(ClockFactory.CacheTrace))
        {
        SanityManager.DEBUG(ClockFactory.CacheTrace, name + 
                  " item " + item + " take on identity " + key);
        }
      }
      
      // tell the object it needs to create itself
      entry = item.takeOnIdentity(this, holderFactory, key, forCreate, createParameter);
    }
    finally
    {
      boolean  notifyWaiters;
      synchronized (this) {


        Object removed = remove(key);
        if (SanityManager.DEBUG) {
          SanityManager.ASSERT(removed == item);
        }


        if (entry != null) {
          // put the actual key into the hash table, not the one that was passed in
          // for the find or create. This is because the caller may re-use the key
          // for another cache operation, which would corrupt our hashtable
          put(entry.getIdentity(), item);
                    if( useByteCount)
                        currentByteCount += ((SizedCacheable) entry).getSize() - origEntrySize;
          item.setValidState(true);
                    validItemCount++;
          notifyWaiters = true;

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     * @param operator
     */
    public void scan( Matchable filter, Operator operator)
    {
        int itemCount = 1;
        Cacheable entry = null;
        CachedItem item = null;


        // Do not call the operator while holding the synchronization lock.
        // However we cannot access an item's links without holding the synchronization lock,
        // nor can we assume that an item is still in the cache unless we hold the synchronization

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  public Cacheable takeOnIdentity(CacheManager cm, CacheableFactory holderFactory,
    Object key, boolean forCreate, Object createParameter)
    throws StandardException {


    // tell the object it needs to create itself
    Cacheable oldEntry = entry;
    if (oldEntry == null)
      oldEntry = holderFactory.newCacheable(cm);


    if (forCreate) {
      entry = oldEntry.createIdentity(key, createParameter);
    } else {
      entry = oldEntry.setIdentity(key);
    }


    if (entry != null) {
      // item was found or created
      if (SanityManager.DEBUG) {

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