Examples of org.jrobin.core.FetchData

org.jrobin.core.FetchData

Class used to represent data fetched from the RRD. Object of this class is created when the method {@link FetchRequest#fetchData() fetchData()} iscalled on a {@link FetchRequest FetchRequest} object.

Data returned from the RRD is, simply, just one big table filled with timestamps and corresponding datasource values. Use {@link #getRowCount() getRowCount()} method to count the numberof returned timestamps (table rows).

The first table column is filled with timestamps. Time intervals between consecutive timestamps are guaranteed to be equal. Use {@link #getTimestamps() getTimestamps()} method to get an array oftimestamps returned.

Remaining columns are filled with datasource values for the whole timestamp range, on a column-per-datasource basis. Use {@link #getColumnCount() getColumnCount()} to findthe number of datasources and {@link #getValues(int) getValues(i)} method to obtainall values for the i-th datasource. Returned datasource values correspond to the values returned with {@link #getTimestamps() getTimestamps()} method.

        private double[][] fetchData(String function, long startTime, long endTime, int dataPoints) {
            RrdDb db = null;
            try {
                db = new RrdDb(getDbPath(), true);


                FetchData data;
                if (dataPoints > 0) {
                    data = db.createFetchRequest(function, startTime, endTime,
                            getResolution(startTime, endTime, dataPoints)).fetchData();
                }
                else {
                    data = db.createFetchRequest(function, startTime, endTime).fetchData();
                }
                return data.getValues();
            }
            catch (IOException e) {
                Log.error("Error initializing Rrdb", e);
            }
            catch (RrdException e) {

Examples of org.jrobin.core.FetchData

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