io.split.engine.segments

Interface SegmentChangeFetcher

All Known Implementing Classes:

HttpSegmentChangeFetcher

public interface SegmentChangeFetcher

Fetches changes in the segment since a reference point.

Author:

adil

Method Summary

Modifier and Type	Method and Description
SegmentChange	fetch(String segmentName, long changesSinceThisChangeNumber) If the segment does not exist, then return the an empty segment change with the latest change number set to a value less than 0.

Method Detail

fetch

SegmentChange fetch(String segmentName,
                    long changesSinceThisChangeNumber)

If the segment does not exist, then return the an empty segment change with the latest change number set to a value less than 0.

If no changes have happened since the change number requested, then return an empty segment change with the latest change number equal to the requested change number.

Parameters:

segmentName - the name of the segment to fetch.

changesSinceThisChangeNumber - a value less than zero implies that the client is requesting information on this segment for the first time.

Returns:

SegmentChange

Throws:

RuntimeException - if there was a problem fetching segment changes