Enum ProcessAction 

pub enum ProcessAction {
    WriteDbLink {
        link_field: &'static str,
        value: EpicsValue,
    },
    ReadDbLink {
        link_field: &'static str,
        target_field: &'static str,
    },
    ReprocessAfter(Duration),
    DeviceCommand {
        command: &'static str,
        args: Vec<EpicsValue>,
    },
}

Side-effect actions that a record requests from the processing framework.

Records return these from process() via ProcessOutcome::actions. The framework executes them at the appropriate point in the processing cycle, keeping records as pure state machines without direct DB access.

Variants

WriteDbLink

Write a value to a DB link. The framework reads link_field from the record to get the target PV name, then writes value to that PV.

Executed after alarm/snapshot, before FLNK. Example: scaler writes CNT to COUT/COUTP links.

Fields

link_field: &'static str

value: EpicsValue

ReadDbLink

Read a value from a DB link into a record field. The framework reads link_field from the record to get the source PV name, reads that PV, and writes the result into target_field via an internal put that bypasses read-only checks.

Pre-process action: executed BEFORE the next process() cycle so the value is immediately available. This matches C EPICS dbGetLink() which is synchronous/immediate.

Example: throttle reads SINP into VAL when SYNC is triggered.

Fields

link_field: &'static str

target_field: &'static str

ReprocessAfter(Duration)

Schedule a re-process of this record after the given duration. The framework spawns tokio::spawn(sleep(d) + process_record(name)). The current cycle’s OUT/FLNK/notify proceed normally.

Equivalent to C EPICS callbackRequestDelayed() + scanOnce().

DeviceCommand

Send a named command to the device support driver. The framework calls DeviceSupport::handle_command() with this data. Used by scaler to request reset/arm/write_preset operations without the record holding a direct driver reference.

Fields

command: &'static str

args: Vec<EpicsValue>

Trait Implementations

impl Clone for ProcessAction

fn clone(&self) -> ProcessAction

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ProcessAction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for ProcessAction

fn eq(&self, other: &ProcessAction) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for ProcessAction