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.tests/test/org/eclipse/birt/data/engine/binding/DataSetCacheTest.java
* @see junit.framework.TestCase#setUp()
	 */
	public void setUp( ) throws Exception
	{
		super.setUp( );
		Context context = Context.enter( );
		scope = context.initStandardObjects( );
		Context.exit( );
		expectedValue = new ArrayList( );
		appContextMap.put( DataEngine.DATASET_CACHE_OPTION, "true" );
		this.appContextMap.put( DataEngine.DATA_SET_CACHE_ROW_LIMIT, null);
		DataEngine myDataEngine = newDataEngine( );
		myDataEngine.clearCache( this.dataSource, this.dataSet );
	}
	/*
	 * @see junit.framework.TestCase#tearDown()
	 */
	public void tearDown( ) throws Exception
	{
		super.tearDown( );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.APITestCase#getDataSourceInfo()
	 */
	protected DataSourceInfo getDataSourceInfo( )
	{
		return new DataSourceInfo( ConfigText.getString( "Api.TestData.TableName" ),
				ConfigText.getString( "Api.TestData.TableSQL" ),
				ConfigText.getString( "Api.TestData.TestDataFileName" ) );
	}