get_filtered_topic_wrapper

lsst.ts.watcher.get_filtered_topic_wrapper(topic, filter_field)

Get a cached TopicWrapper.

Parameters

topiclsst.ts.salobj.ReadTopic

Topic to read.

filter_fieldstr

Field to filter on. The field must be a scalar. It should also have a smallish number of expected values, in order to avoid caching too much data.

Raises

KeyError

If the wrapper is not in the registry.