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
import org.eclipse.birt.data.engine.api.IResultMetaData;
import org.eclipse.birt.data.engine.api.querydefn.BaseDataSetDesign;
import org.eclipse.birt.data.engine.api.querydefn.ColumnDefinition;
import org.eclipse.birt.data.engine.api.querydefn.ComputedColumn;
import org.eclipse.birt.data.engine.api.querydefn.GroupDefinition;
import org.eclipse.birt.data.engine.api.querydefn.QueryDefinition;
import org.eclipse.birt.data.engine.api.querydefn.ScriptDataSetDesign;
import org.eclipse.birt.data.engine.api.querydefn.ScriptDataSourceDesign;
import org.eclipse.birt.data.engine.api.querydefn.ScriptExpression;
import org.eclipse.birt.data.engine.api.querydefn.SubqueryDefinition;
import org.eclipse.birt.data.engine.core.DataException;
import org.eclipse.birt.data.engine.executor.DataSetCacheManager;
import org.eclipse.birt.data.engine.impl.DataEngineImpl;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ScriptableObject;
import testutil.ConfigText;
/**
 * Test cache feature for oda result set.
 */
public class DataSetCacheTest extends APITestCase
{
	
	private List expectedValue;
	private IBaseExpression[] rowBeArray;
	private IBaseExpression[] totalBeArray;
	private String[] bindingNameRow;
	private String[] bindingExprRow;
	Map appContextMap = new HashMap( );
	ScriptableObject scope;
	/*