`event_model`#

Members

`Datum`	Document to reference a quanta of externally-stored data
`DatumPage`	Page of documents to reference a quanta of externally-stored data
`Event`	Document to record a quanta of collected data
`PartialEvent`
`Configuration`
`DataKey`	Describes the objects in the data property of Event documents
`EventDescriptor`	Document to describe the data captured in the associated event documents
`Limits`	Epics limits: see 3.4.1 https://epics.anl.gov/base/R3-14/12-docs/AppDevGuide/node4.html
`LimitsRange`
`PerObjectHint`	The 'interesting' data keys for this device.
`EventPage`	Page of documents to record a quanta of collected data
`PartialEventPage`
`PartialResource`
`Resource`	Document to reference a collection (e.g. file or group of files) of externally-stored data.
`Calculation`
`Hints`	Start-level hints
`LinkedEventProjection`
`StaticProjection`
`CalculatedEventProjection`
`ConfigurationProjection`
`Projections`	Describe how to interperet this run as the given projection
`RunStart`	Document created at the start of run.
`RunStop`	Document for the end of a run indicating the success/fail state of the run and the end time
`StreamDatum`	Document to reference a quanta of an externally-stored stream of data.
`StreamRange`	The parameters required to describe a sequence of incrementing integers
`StreamResource`	Document to reference a collection (e.g. file or group of files) of externally-stored data streams.
`DocumentNames`
`compose_run`	Compose a RunStart document and factory functions for related documents.

class event_model.Datum[source]#

Document to reference a quanta of externally-stored data

datum_id: str#: Globally unique identifier for this Datum (akin to ‘uid’ for other Document types), typically formatted as ‘<resource>/<integer>’

datum_kwargs: Dict[str, Any]#: Arguments to pass to the Handler to retrieve one quanta of data

resource: str#: The UID of the Resource to which this Datum belongs

class event_model.DatumPage[source]#

Page of documents to reference a quanta of externally-stored data

datum_id: List[str]#: Array unique identifiers for each Datum (akin to ‘uid’ for other Document types), typically formatted as ‘<resource>/<integer>’

datum_kwargs: Dict[str, List]#: Array of arguments to pass to the Handler to retrieve one quanta of data

resource: str#: The UID of the Resource to which all Datums in the page belong

class event_model.Event[source]#

Document to record a quanta of collected data

descriptor: str#: UID of the EventDescriptor to which this Event belongs

seq_num: int#: Sequence number to identify the location of this Event in the Event stream

uid: str#: Globally unique identifier for this Event

class event_model.DataKey[source]#

Describes the objects in the data property of Event documents

choices: NotRequired[List[str]]#: Choices of enum value.

dims: NotRequired[List[str]]#: The names for dimensions of the data. Null or empty list if scalar data

dtype: Literal['string', 'number', 'array', 'boolean', 'integer']#: The type of the data in the event, given as a broad JSON schema type.

dtype_numpy: NotRequired[str | List[List]]#: The type of the data in the event, given as a numpy dtype string (or, for structured dtypes, array).

external: NotRequired[str]#: Where the data is stored if it is stored external to the events

limits: NotRequired[Limits]#: Epics limits.

object_name: NotRequired[str]#: The name of the object this key was pulled from.

precision: NotRequired[int | None]#: Number of digits after decimal place if a floating point number

shape: List[int]#: The shape of the data. Empty list indicates scalar data.

source: str#: The source (ex piece of hardware) of the data.

units: NotRequired[str]#: Engineering units of the value

class event_model.EventDescriptor[source]#

Document to describe the data captured in the associated event documents

configuration: NotRequired[Dict[str, Configuration]]#: Readings of configurational fields necessary for interpreting data in the Events.

data_keys: Dict[str, DataKey]#: This describes the data in the Event Documents.

name: NotRequired[str]#: A human-friendly name for this data stream, such as ‘primary’ or ‘baseline’.

object_keys: NotRequired[Dict[str, Any]]#: Maps a Device/Signal name to the names of the entries it produces in data_keys.

run_start: str#: Globally unique ID of this run’s ‘start’ document.

time: float#: Creation time of the document as unix epoch time.

uid: str#: Globally unique ID for this event descriptor.

class event_model.Limits[source]#

Epics limits: see 3.4.1 https://epics.anl.gov/base/R3-14/12-docs/AppDevGuide/node4.html

alarm: NotRequired[LimitsRange | None]#: Alarm limits.

control: NotRequired[LimitsRange | None]#: Control limits.

display: NotRequired[LimitsRange | None]#: Display limits.

hysteresis: NotRequired[float | None]#: Hysteresis.

rds: NotRequired[RdsRange | None]#: RDS parameters.

warning: NotRequired[LimitsRange | None]#: Warning limits.

class event_model.PerObjectHint[source]#

The ‘interesting’ data keys for this device.

NX_class: NotRequired[str]#: The NeXus class definition for this device.

fields: NotRequired[List[str]]#: The ‘interesting’ data keys for this device.

class event_model.EventPage[source]#

Page of documents to record a quanta of collected data

descriptor: str#: The UID of the EventDescriptor to which all of the Events in this page belong

seq_num: List[int]#: Array of sequence numbers to identify the location of each Event in the Event stream

uid: List[str]#: Array of globally unique identifiers for each Event

class event_model.Resource[source]#

Document to reference a collection (e.g. file or group of files) of externally-stored data

path_semantics: NotRequired[Literal['posix', 'windows']]#: Rules for joining paths

run_start: NotRequired[str]#: Globally unique ID to the run_start document this resource is associated with.

class event_model.Hints[source]#

Start-level hints

dimensions: NotRequired[List[List[List[str] | str]]]#: The independent axes of the experiment. Ordered slow to fast

class event_model.Projections[source]#

Describe how to interperet this run as the given projection

configuration: Dict[str, Any]#: Static information about projection

name: NotRequired[str]#: The name of the projection

version: str#: The version of the projection spec. Can specify the version of an external specification.

class event_model.RunStart[source]#

Document created at the start of run. Provides a seach target and later documents link to it

data_groups: NotRequired[List[str]]#: An optional list of data access groups that have meaning to some external system. Examples might include facility, beamline, end stations, proposal, safety form.

data_session: NotRequired[str]#: An optional field for grouping runs. The meaning is not mandated, but this is a data management grouping and not a scientific grouping. It is intended to group runs in a visit or set of trials.

group: NotRequired[str]#: Unix group to associate this data with

owner: NotRequired[str]#: Unix owner to associate this data with

project: NotRequired[str]#: Name of project that this run is part of

sample: NotRequired[Dict[str, Any] | str]#: Information about the sample, may be a UID to another collection

scan_id: NotRequired[int]#: Scan ID number, not globally unique

time: float#: Time the run started. Unix epoch time

uid: str#: Globally unique ID for this run

class event_model.RunStop[source]#

Document for the end of a run indicating the success/fail state of the run and the end time

data_type: NotRequired[Any]#: data_type

exit_status: Literal['success', 'abort', 'fail']#: State of the run when it ended

num_events: NotRequired[Dict[str, int]]#: Number of Events per named stream

reason: NotRequired[str]#: Long-form description of why the run ended

run_start: str#: Reference back to the run_start document that this document is paired with.

time: float#: The time the run ended. Unix epoch

uid: str#: Globally unique ID for this document

class event_model.StreamDatum[source]#

Document to reference a quanta of an externally-stored stream of data.

descriptor: str#: UID of the EventDescriptor to which this Datum belongs

indices: StreamRange#: A slice object passed to the StreamResource handler so it can hand back data and timestamps

seq_nums: StreamRange#: A slice object showing the Event numbers the resource corresponds to

stream_resource: str#: The UID of the Stream Resource to which this Datum belongs.

uid: str#: Globally unique identifier for this Datum. A suggested formatting being ‘<stream_resource>/<stream_name>/<block_id>

class event_model.StreamRange[source]#

The parameters required to describe a sequence of incrementing integers

start: int#: First number in the range

stop: int#: Last number in the range is less than this number

class event_model.StreamResource[source]#

Document to reference a collection (e.g. file or group of files) of externally-stored data streams

data_key: str#: A string to show which data_key of the Descriptor are being streamed

mimetype: str#: String identifying the format/type of this Stream Resource, used to identify a compatible Handler

parameters: Dict[str, Any]#: Additional keyword arguments to pass to the Handler to read a Stream Resource

run_start: NotRequired[str]#: Globally unique ID to the run_start document this Stream Resource is associated with.

uid: str#: Globally unique identifier for this Stream Resource

uri: str#: URI for locating this resource

event_model.compose_run(*, uid: str | None = None, time: float | None = None, metadata: Dict | None = None, validate: bool = True, event_counters: Dict[str, int] | None = None) → ComposeRunBundle[source]#

Compose a RunStart document and factory functions for related documents.

Parameters:

uid (string, optional) – Unique identifier for this run, conventionally a UUID4. If None is given, a UUID4 will be generated.
time (float, optional) – UNIX epoch time of start of this run. If None is given, the current time will be used.
metadata (dict, optional) – Additional metadata include the document
validate (boolean, optional) – Validate this document conforms to the schema.
event_counters (dict, optional) – A dict for counting events, when an event is composed by any of the descriptors composed by this run, the element in this dict with the key of the descriptor name will be increased by 1.

Return type:

ComposeRunBundle

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`event_model`#