Bug 180189 Support in memory data set cache.
Currently, Design-Time Data Cache is stored on disks. By performance tests using ramdisk, we found that caching in physical memory can improve the performance of RunAndRender by 30%.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/api/DataEngine.java
{
			throw new DataException( ResourceConstants.LOAD_FACTORY_ERROR );
		}
	}
    
    /**
	 * Creates a new instance of DataEngine, using the specified Javascript
	 * scope and home directory setting.
	 * 
	 * @param sharedScope
	 *            a Javascript scope to be used as the "shared" scope to
	 *            evaluate Javascript expressions by the data engine.
	 * @deprecated use newDataEngine( DataEngineContext context ) instead
	 */
    public static DataEngine newDataEngine( Scriptable sharedScope )
	{
		try
		{
			return newDataEngine( DataEngineContext.newInstance( DataEngineContext.DIRECT_PRESENTATION,
					sharedScope,
					null,
					null ) );
		}
		catch ( BirtException e )
		{
			
			return null;
		}
	}