Commands

Commands are parameter sets called Setup, Observe, and Wait. A command is created with the source of the command, given by a prefix, the name of the command, and an optional ObsId. Parameters are added to the command as needed.

ObsId

An ObsID, or observation ID, indicates the observation the command is associated with. It is a simple string.

Typescript

const obsId: string = 'Obs001'

Prefix

The source of the command is given by the prefix, which should be the full name of the component sending the command. A prefix can be constructed with a string, but must start with a valid subsystem as in Subsystem. A component developer should supply a valid prefix string and the subsystem will be automatically parsed from it. An example of a valid string prefix is “nfiraos.ncc.trombone”.

Type definition can be found @here

See below examples:

Typescript

const prefix: Prefix = new Prefix('NFIRAOS', 'ncc.trombone')

CommandName

Each command has a name given as a string. The string should be continuous with no spaces.

Setup Command

This command is used to describe a goal that a system should match. The component developer is required to supply following arguments to create a Setup command.

• Prefix: the source of the command as described above
• CommandName: a simple string name for the command (no spaces)
• ObsId: an optional observation id.
• paramSet: Optional Set of Parameters. Default is empty.

Type definition for Setup Command can be found here

Typescript

const obsId: string = 'Obs001'
const prefix: Prefix = new Prefix('NFIRAOS', 'ncc.trombone')
const commandName = 'move'
const filterKey = intArrayKey('filter')
const filterParam: Parameter<IntArrayKey> = filterKey.set([
  [1, 2, 3],
  [4, 5, 6]
])

const setup: Setup = new Setup(prefix, commandName, [filterParam], obsId)

Observe Command

This command describes a science observation. It is intended to be sent only to Science Detector Assemblies and Sequencers.

Type definition for Observe Command can be found here

Typescript

const obsId: string = 'Obs001'
const prefix: Prefix = new Prefix('NFIRAOS', 'ncc.trombone')
const commandName = 'move'
const filterKey = intArrayKey('filter')
const filterParam: Parameter<IntArrayKey> = filterKey.set([
  [1, 2, 3],
  [4, 5, 6]
])

const observe: Observe = new Observe(
  prefix,
  commandName,
  [filterParam],
  obsId
)

Wait Command

This command causes a Sequencer to wait until notified. It can only be sent to Sequencers.

Type definition for Wait Command can be found here

Typescript

const obsId: string = 'Obs001'
const prefix: Prefix = new Prefix('NFIRAOS', 'ncc.trombone')
const commandName = 'move'
const filterKey = intArrayKey('filter')
const filterParam: Parameter<IntArrayKey> = filterKey.set([
  [1, 2, 3],
  [4, 5, 6]
])

const wait: Wait = new Wait(prefix, commandName, [filterParam], obsId)

Unique Key constraint

By design, a ParameterSet in a Setup, Observe, or Wait command is optimized to store only unique keys. When using add or madd methods on commands to add new parameters, if the parameter being added has a key which is already present in the paramSet, the already stored parameter will be replaced by the given parameter.

Here are some examples that illustrate this point:

Typescript

const obsId: string = 'Obs001'
const prefix: Prefix = new Prefix('NFIRAOS', 'ncc.trombone')
const commandName = 'move'
const filterKey = intArrayKey('filter')
const randomKey = stringKey('directions')
const filterParam: Parameter<IntArrayKey> = filterKey.set([[1, 2, 3]])
const param1 = randomKey.set(['east', 'west'])
const param2 = randomKey.set(['north', 'south'])

const wait: Wait = new Wait(prefix, commandName, [filterParam], obsId)
wait.madd([param1, param2])

//duplicate keys will not be added. Should contain one randomKey and one Filter key
wait.paramSet.forEach((x) => console.log(x.keyName))