ArchiveSupport

= Archive Support =

Provides access to historic control system data, for example for the DataBrowser.

The initial API was in org.csstudio.archive with pluggable implementations for the Channel Archiver, DESY AAPI, SNS RDB archive, DESY archive record, and others.

Since Feb. 2010, there is a new API in org.csstudio.archivereader with pluggable implementations for the Channel Archiver and the SNS RDB archive.

Motivation for the new API:

• Samples are fetched via iterators, similar to JDBC. The old API returned an array of samples and would either run out of memory when trying to get a lot of data, or return only a fraction of the requested data, which in turn required another layer of code to * iterate over 'batches' of partial results.
• Functionality that several data providers never actually implemented has been removed
• Channel search via 'glob' pattern, which can be a lot faster than regular expression search, is directly supported.