EventEvaluation

class aws_cdk.aws_iotevents.EventEvaluation(value)

Bases: Enum

(experimental) Information about the order in which events are evaluated and how actions are executed.

Stability

experimental

ExampleMetadata

infused

Example:

import aws_cdk.aws_iotevents as iotevents
import aws_cdk.aws_iotevents_actions as actions
import aws_cdk.aws_lambda as lambda_

# func: lambda.IFunction


input = iotevents.Input(self, "MyInput",
    input_name="my_input",  # optional
    attribute_json_paths=["payload.deviceId", "payload.temperature"]
)

warm_state = iotevents.State(
    state_name="warm",
    on_enter=[iotevents.Event(
        event_name="test-enter-event",
        condition=iotevents.Expression.current_input(input),
        actions=[actions.LambdaInvokeAction(func)]
    )],
    on_input=[iotevents.Event( # optional
        event_name="test-input-event",
        actions=[actions.LambdaInvokeAction(func)])],
    on_exit=[iotevents.Event( # optional
        event_name="test-exit-event",
        actions=[actions.LambdaInvokeAction(func)])]
)
cold_state = iotevents.State(
    state_name="cold"
)

# transit to coldState when temperature is less than 15
warm_state.transition_to(cold_state,
    event_name="to_coldState",  # optional property, default by combining the names of the States
    when=iotevents.Expression.lt(
        iotevents.Expression.input_attribute(input, "payload.temperature"),
        iotevents.Expression.from_string("15")),
    executing=[actions.LambdaInvokeAction(func)]
)
# transit to warmState when temperature is greater than or equal to 15
cold_state.transition_to(warm_state,
    when=iotevents.Expression.gte(
        iotevents.Expression.input_attribute(input, "payload.temperature"),
        iotevents.Expression.from_string("15"))
)

iotevents.DetectorModel(self, "MyDetectorModel",
    detector_model_name="test-detector-model",  # optional
    description="test-detector-model-description",  # optional property, default is none
    evaluation_method=iotevents.EventEvaluation.SERIAL,  # optional property, default is iotevents.EventEvaluation.BATCH
    detector_key="payload.deviceId",  # optional property, default is none and single detector instance will be created and all inputs will be routed to it
    initial_state=warm_state
)

Attributes

BATCH

(experimental) When setting to BATCH, variables within a state are updated and events within a state are performed only after all event conditions are evaluated.

Stability

experimental

SERIAL

(experimental) When setting to SERIAL, variables are updated and event conditions are evaluated in the order that the events are defined.

Stability

experimental