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/executor/DataSetCacheManager.java
{
				ro = (ResultObject) ( ( (ResultIterator) iterator ).getOdiResult( ).getCurrentResult( ) );
				merge.saveObject( ro );
			}
		}
		merge.close( );
	}
	/**
	 * A private method to read all the query blocks to an arraylist one by one
	 * 
	 * @return an ArrayList that record each query block assigned by the user
	 * @throws IOException
	 */
	private ArrayList readConfigFile( String file, BufferedReader reader )
			throws IOException
	{
		ArrayList list = new ArrayList( );
		String line;
		StringBuffer block = new StringBuffer( "" );
		
		boolean begin = false;
		while ( ( line = reader.readLine( ) ) != null )
		{
			line.trim( );
			if ( line.startsWith( BEGIN ) && !begin )
			{
				begin = true;
				line = line.substring( 7 );
			}
			if ( line.endsWith( END ) && begin )