caproto.server.PvpropertyStringRO

Inheritance diagram of PvpropertyStringRO
class caproto.server.PvpropertyStringRO(*, pvname, group, pvspec, doc=None, record=None, logger=None, **kwargs)[source]

Read-only 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(host, user)

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

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