tickit 0.4.3

Event-based device simulation framework

An event-based multi-device simulation framework providing configuration and orchestration of complex multi-device simulations.

PyPI	pip install tickit
Source code	https://github.com/dls-controls/tickit
Documentation	https://dls-controls.github.io/tickit
Releases	https://github.com/dls-controls/tickit/releases

An example simulation consists of a simple counter and a sink. The counter increments up a given value and then passes this value to a sink.

A simulation is defined using a yaml file, in which the graphing of the required components is denoted. This file defines a Counter device named counter and a Sink device named counter_sink. The output _value of counter is wired to the input of counter_sink.

- type: examples.devices.counter.Counter
  name: counter
  inputs: {}
- type: tickit.devices.sink.Sink
  name: counter_sink
  inputs:
    input:
      component: counter
      port: _value

This file is executed to run the simulation.

python -m tickit all examples/configs/counter.yaml

The simulation will output logs depicting the incrementing of the counter:

DEBUG:examples.devices.counter:Counter initialized with value => 0
DEBUG:asyncio:Using selector: EpollSelector
DEBUG:tickit.core.management.ticker:Doing tick @ 0
DEBUG:tickit.core.components.component:counter got Input(target='counter', time=0, changes=immutables.Map({}))
DEBUG:examples.devices.counter:Counter incremented to 1
DEBUG:tickit.core.management.schedulers.base:Scheduler got Output(source='counter', time=0, changes=immutables.Map({'value': 1}), call_at=1000000000)
DEBUG:tickit.core.management.schedulers.base:Scheduling counter for wakeup at 1000000000
DEBUG:tickit.core.components.component:counter_sink got Input(target='counter_sink', time=0, changes=immutables.Map({}))
DEBUG:tickit.devices.sink:Sunk {}
DEBUG:tickit.core.management.schedulers.base:Scheduler got Output(source='counter_sink', time=0, changes=immutables.Map({}), call_at=None)
DEBUG:tickit.core.management.ticker:Doing tick @ 1000000000
DEBUG:tickit.core.components.component:counter got Input(target='counter', time=1000000000, changes=immutables.Map({}))
DEBUG:examples.devices.counter:Counter incremented to 2
DEBUG:tickit.core.management.schedulers.base:Scheduler got Output(source='counter', time=1000000000, changes=immutables.Map({'value': 2}), call_at=2000000000)

The counting device is defined as below. It increments a given value and logs as it increments.

@dataclass
class Counter(ComponentConfig):
    """Simple counting device."""

    def __call__(self) -> Component:  # noqa: D102
        return DeviceComponent(
            name=self.name,
            device=CounterDevice(),
            )

class CounterDevice(Device):
    """A simple device which increments a value."""

    class Inputs(TypedDict):
        ...

    class Outputs(TypedDict):
        value: int

    def __init__(self, initial_value: int = 0, callback_period: int = int(1e9)) -> None:
        self._value = initial_value
        self.callback_period = SimTime(callback_period)
        LOGGER.debug(f"Counter initialized with value => {self._value}")

    def update(self, time: SimTime, inputs: Inputs) -> DeviceUpdate[Outputs]:
        self._value = self._value + 1
        LOGGER.debug(f"Counter incremented to {self._value}")
        return DeviceUpdate(
            CounterDevice.Outputs(value=self._value),
            SimTime(time + self.callback_period),
        )

See https://dls-controls.github.io/tickit for more detailed documentation.