Channel receiving original Documents coming over the oplog before transformation.
True if OperationsLog has been started but has not been stopped.
Channel receiving transformed oplog Documents into Operation instances.
Starts the oplog monitor.
Starts the oplog monitor. Will begin firing Document instances to documents
and Operation instances to
operations
. Will throw an error if already running. See #startIfNotRunning for a safe ignorant start.
Works like #start, but does not throw an error if already started.
Stops the monitor on the oplog.