ICALEPCS2023 - List of Authors (Ojur, B.A.)

Paper	Title	Page
TH1BCO04	Asynchronous Execution of Tango Commands in the SKA Telescope Control System: An Alternative to the Tango Async Device	1108
	B.A. Ojur, A.J. Venter SARAO, Cape Town, South Africa D. Devereux CSIRO, Clayton, Australia D. Devereux, S.N. Twum, S. Vrcic SKAO, Macclesfield, United Kingdom
	Equipment controlled by the Square Kilometre Array (SKA) Control System will have a TANGO interface for control and monitoring. Commands on TANGO device servers have a 3000 milliseconds window to complete their execution and return to the client. This timeout places a limitation on some commands used on SKA TANGO devices which take longer than the 3000 milliseconds window to complete; the threshold is more stricter in the SKA Control System (CS) Guidelines. Such a command, identified as a Long Running Command (LRC), needs to be executed asynchronously to circumvent the timeout. TANGO has support for an asynchronous device which allows commands to be executed slower than 3000 milliseconds by using a coroutine to put the task on an event loop. During the exploration of this, a decision was made to implement a custom approach in our base repository which all devices depend on. In this approach, every command annotated as ¿long running¿ is handed over to a thread to complete the task and its progress is tracked through attributes. These attributes report the queued commands along with their progress, status and results. The client is provided with a unique identifier which can be used to track the execution of the LRC and take further action based on the outcome of that command. LRCs can be aborted safely using a custom TANGO command. We present the reference design and implementation of the Long Running Commands for the SKA Controls System.
	Slides TH1BCO04 [0.674 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-TH1BCO04
About •	Received ※ 06 October 2023 — Revised ※ 24 October 2023 — Accepted ※ 20 December 2023 — Issued ※ 22 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Asynchronous Execution of Tango Commands in the SKA Telescope Control System: An Alternative to the Tango Async Device

1108

B.A. Ojur, A.J. Venter
SARAO, Cape Town, South Africa
D. Devereux
CSIRO, Clayton, Australia
D. Devereux, S.N. Twum, S. Vrcic
SKAO, Macclesfield, United Kingdom

Equipment controlled by the Square Kilometre Array (SKA) Control System will have a TANGO interface for control and monitoring. Commands on TANGO device servers have a 3000 milliseconds window to complete their execution and return to the client. This timeout places a limitation on some commands used on SKA TANGO devices which take longer than the 3000 milliseconds window to complete; the threshold is more stricter in the SKA Control System (CS) Guidelines. Such a command, identified as a Long Running Command (LRC), needs to be executed asynchronously to circumvent the timeout. TANGO has support for an asynchronous device which allows commands to be executed slower than 3000 milliseconds by using a coroutine to put the task on an event loop. During the exploration of this, a decision was made to implement a custom approach in our base repository which all devices depend on. In this approach, every command annotated as ¿long running¿ is handed over to a thread to complete the task and its progress is tracked through attributes. These attributes report the queued commands along with their progress, status and results. The client is provided with a unique identifier which can be used to track the execution of the LRC and take further action based on the outcome of that command. LRCs can be aborted safely using a custom TANGO command. We present the reference design and implementation of the Long Running Commands for the SKA Controls System.

Slides TH1BCO04 [0.674 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-TH1BCO04

About •

Received ※ 06 October 2023 — Revised ※ 24 October 2023 — Accepted ※ 20 December 2023 — Issued ※ 22 December 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)