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 INVALID_TYPE_IN_EXPR = "data.engine.BadDataTypeCondExpr";
	public final static String WRAPPED_BIRT_EXCEPTION = "data.engine.BirtException";
	
	
	public final static String DATASETCACHE_SAVE_ERROR = "data.engine.datasetcache.save.error";
	public final static String DATASETCACHE_LOAD_ERROR = "data.engine.datasetcache.load.error";
	
	
	public final static String RD_INVALID_MODE = "data.engine.InvalidMode";
	public final static String RD_INVALID_ARCHIVE = "data.engine.InvalidArchive";
	public final static String RD_SAVE_ERROR = "data.engine.SaveReportDocumentError";
	public final static String RD_LOAD_ERROR = "data.engine.LoadReportDocumentError";
	public final static String RD_SAVE_STREAM_ERROR = "data.engine.GetSaveStreamError";
	public final static String RD_LOAD_STREAM_ERROR = "data.engine.GetLoadStreamError";
	public final static String RD_EXPR_NULL_ERROR = "data.engine.NullExpr";
	public final static String RD_EXPR_INVALID_ERROR = "data.engine.InValidExpr";
	public final static String RD_EXPR_RESULT_SET_NOT_START = "data.engine.ResultSetNotStart";
	
	public final static String INVALID_ROW_INDEX = "data.engine.invalidRowIndex";
	public final static String BACKWARD_SEEK_ERROR = "data.engine.backwardSeekError";
	public final static String START_ERROR = "data.engine.startError";
	
	
	public final static String RD_INVALID_FILTER = "data.engine.rd.errorfilters";
	
	
	public final static String SCRIPT_EVAL_ERROR = "data.engine.ScriptEvalError";
	public final static String PREPARED_QUERY_CLOSED = "data.engine.PreparedQueryClosed";	
	public final static String DEFAULT_INPUT_PARAMETER_VALUE_CANNOT_BE_NULL = "data.engine.NullDefaultInParamValue";
	public final static String INVALID_GROUP_EXPR = "data.engine.BadGroupKeyExpr";