TCPSink

TCPSink task sends data via socket to vispublisher which further distributes a selection of data to user clients such as vis and spd. Two-stage data distribution approach allows us to decouple of real time application such as ingest pipeline from user-defined application capable of creating variable processing load. Due to the shear amount of data we do not expect that this task can be scaled up to full ASKAP. But nothing stops us to continue using it with, e.g. frequency-averaged data. Also note that this task can only be used for a single data stream. The code was specifically designed to be as graceful as possible on the core functionality of the ingest pipeline if send operaton cannot keep up (i.e. monitoring of the data should be affected first before normal functionality of the ingest pipeline).

Configuration Parameters

The program requires a configuration file be provided on the command line. This section describes the valid parameters. In addition to mandatory parameters which are always required, individual tasks often have specific parameters which need to be defined only if a particular task is used. As for all tasks, parameters are taken from keys with tasks.name.params prefix (not shown in the table below) where name is an arbitrary name assigned to this task and used in tasklist (this allows us to run the same task more than once with different parameters. The type of the task defined by tasks.name.type should be set to TCPSink.

Parameter	Type	Default	Description
dest.hostname	string	None	Hostname to send the data to, i.e. machine which runs vispublisher. This task doesn’t fail in the case of any network error.
dest.port	string	None	Port number to use. It is passed as a string to asio library.

Example

########################## TCPSink ##############################

tasks.tasklist = [MergedSource, Merge, CalcUVWTask, FringeRotationTask, MSSink, TCPSink]

# sink task sending the data for monitoring via vis and spd
tasks.TCPSink.params.dest.hostname = aktos11.atnf.csiro.au
tasks.TCPSink.params.dest.port = 9001
# type of the task
tasks.TCPSink.type = TCPSink