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

          {
            
            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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   */
  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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            getLanguageConnectionFactory().getStatementCache();


    if (statementCache == null)
      return;
 
        Cacheable cachedItem = statementCache.findCached(statement);
        // No need to do anything if the statement is already removed
        if (cachedItem != null) {
            CachedStatement cs = (CachedStatement) cachedItem;
            if (statement.getPreparedStatement() != cs.getPreparedStatement()) {
                // DERBY-3786: Someone else has removed the statement from

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    // statement caching disable when in DDL mode
    if (dataDictionaryInWriteMode()) {
      return null;
    }


    Cacheable cachedItem = statementCache.find(statement);


    CachedStatement cs = (CachedStatement) cachedItem;




    GenericPreparedStatement ps = cs.getPreparedStatement();

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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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  public Cacheable createIdentity(Object key, Object createParameter) throws StandardException {


    ContainerKey newIdentity = (ContainerKey) key;


    if (newIdentity.getSegmentId() != ContainerHandle.TEMPORARY_SEGMENT) {
      Cacheable realContainer = dataFactory.newContainerObject();
      return realContainer.createIdentity(newIdentity, createParameter);
    }


    return createIdent(newIdentity, createParameter);
  }

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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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org.apache.derby.impl.sql.catalog.DataDictionaryImpl

org.apache.derby.impl.sql.catalog.SequenceUpdater

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