Bug 180842 Config memory buffer size in data engine execution.
To tuning the performance, it is necessary for DtE to expose API for clients to config the size of memory it used to store the final result set. A new AppContext string, "org.eclipse.birt.data.cache.memory.size" is proposed. The new appcontext entry only accept positive integer as input, the unit of which would be MB.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/i18n/ResourceConstants.java
public final static String CANNOT_SET_BOOLEAN_PARAMETER = "odaconsumer.CannotSetBooleanParameter";
    public final static String CANNOT_SET_NULL_PARAMETER = "odaconsumer.CannotSetNullParameter";
	public final static String CANNOT_CLEAR_IN_PARAMETERS = "odaconsumer.CannotClearInParameters";
	public final static String UNRECOGNIZED_ODA_TYPE = "odaconsumer.UnrecognizedOdaType";
	public final static String CANNOT_GET_COLUMN_NATIVE_TYPE_NAME = "odaconsumer.CannotGetColumnNativeDataTypeName";
	public final static String CANNOT_GET_PARAMETER_METADATA = "odaconsumer.CannotGetParameterMetaData";
	public final static String CANNOT_LOAD_ODA_ADAPTER = "odaconsumer.CannotLoadOdaAdapter";
	public final static String MUST_SPECIFY_COLUMN_NAME = "odaconsumer.MustSpecifyColumnName";
	public final static String CANNOT_FIND_LOG_DIRECTORY = "odaconsumer.CannotFindLogDirectory";
	
	public final static String OLAPDIR_CREATE_FAIL = "data.olap.OlapDirCreateFail";
	public final static String OLAPFILE_CREATE_FAIL = "data.olap.OlapFileCreateFail";
	public final static String OLAPFILE_NOT_FOUND = "data.olap.OlapFileNotFound";
	public final static String DIMENSION_NOT_EXIST = "data.olap.DimensionNotExist";
	public final static String KEY_VALUE_CANNOT_BE_NULL = "data.olap.KeyValueCanNotBeNull";
	public final static String DETAIL_MEMBER_HAVE_MULTI_PARENT = "data.olap.DetailMemberHaveMultiParent";
	public final static String OLAPFILE_FORMAT_INVALID = "data.olap.OlapFileFormatError";
	public final static String OLAPFILE_DATA_ERROR = "data.olap.OlapFileDataError";
	public final static String DOCUMENTOBJECT_ALWAYS_EXIST = "data.olap.DocumentObjectAlreadyExists";
	public final static String FACTTABLE_ROW_NOT_DISTINCT = "data.olap.FacttableRowNotDistinct";
	public final static String FACTTABLE_NULL_MEASURE_VALUE = "data.olap.FacttableNullMeasureValue";
	public final static String INVALID_DIMENSIONPOSITION_OF_FACTTABLEROW = "data.olap.InvalidDimensionPositionFacttableRow";
	public final static String MEASURE_NAME_NOT_FOUND = "data.olap.measureNameNotFound";
	public final static String LEVEL_NAME_NOT_FOUND = "data.olap.levelNameNotFound";
	public final static String CURSOR_POSITION_SET_ERROR = "data.olap.cursorPositionError";
	public final static String CURSOR_SEEK_ERROR = "data.olap.cursorSeekError";
	public final static String CANNOT_GET_MEASURE_VALUE = "data.olap.CannotGetMeasureValue";
	public final static String DOCUMENTOBJECT_NOT_EXIST = "data.olap.DocumentObjectNotExists";
}