org.opennms.web.rest.measurements.fetch

Interface MeasurementFetchStrategy

All Known Implementing Classes:

AbstractRrdBasedFetchStrategy, JrobinFetchStrategy, NoOpStrategy, RrdtoolXportFetchStrategy

public interface MeasurementFetchStrategy

Used to retrieve measurements from the current persistence mechanism.

Author:

Jesse White

Method Summary

Modifier and Type	Method and Description
FetchResults	fetch(long start, long end, long step, int maxrows, List<Source> sources) Fetches the measurements for the given sources.

Method Detail

fetch

FetchResults fetch(long start,
                   long end,
                   long step,
                   int maxrows,
                   List<Source> sources)
            throws Exception

Fetches the measurements for the given sources.

Parameters:

start - timestamp in milliseconds

end - timestamp in milliseconds

step - desired resolution in milliseconds - actual resolution might differ

maxrows - maximum number of rows- no limit when <= 0

sources - array of sources - these should have unique labels

Returns:

null when a resource id or attribute cannot be found

Throws:

Exception