caproto.server.PvpropertyString¶

class caproto.server.PvpropertyString(*, pvname: str, group: caproto.server.server.PVGroup, pvspec: caproto.server.server.PVSpec, doc: Optional[str] = None, record: Optional[Union[str, Type[T_RecordFields]]] = None, logger: Optional[logging.Logger] = None, **kwargs)[source]¶

Read-write STRING data for pvproperty (up to 40 chars).

Methods

`auth_read`(hostname, username, data_type, *)	Get DBR data and native data, converted to a specific type
`auth_write`(hostname, username, data, …[, …])	Data write hook for clients.
`calculate_length`(value)	Calculate the number of elements given a value
`check_access`(hostname, username)	This always returns `AccessRights.READ\|AccessRights.WRITE`.
`get_field`(field)	Get a field by name.
`is_compatible_array`(value)	Check if the provided value is a compatible array.
`post_state_change`(state, new_value)	This is called by the server when it exits its StateUpdateContext.
`pre_state_change`(state, new_value)	This is called by the server when it enters its StateUpdateContext.
`preprocess_value`(value)	Pre-process values destined for verify_value and write
`publish`(flags)	Publish data to appropriate queues matching the SubscriptionSpec.
`read`(data_type)	The top-level read method, with a specific requested data type.
`subscribe`(queue, sub_spec, sub)	Subscribe a queue for the given subscription specification.
`unsubscribe`(queue, sub_spec)	Unsubscribe a queue for the given subscription specification.
`update_fields`(value)	This is a hook to update field instance data.
`verify_value`(value)	The top-level dbr-facing “write” method.
`write`(value, *[, flags])	Write data from native Python types.
`write_from_dbr`(*args[, flags])	Write data from a provided DBR data type.
`write_metadata`([publish, units, precision, …])	Write metadata, optionally publishing information to clients.

Attributes

`alarm`	The ChannelAlarm associated with this data
`data_type`
`default_value`
`epics_timestamp`	EPICS timestamp as (seconds, nanoseconds) since EPICS epoch.
`length`	The number of elements (length) of the current value
`long_string_max_length`	The maximum number of elements (length) of the current value
`max_length`	The maximum number of elements (length) this channel can hold
`severity`	Alarm severity
`status`	Alarm status
`timestamp`	UNIX timestamp in seconds.
`value`	Read-only access to value data