Task Lifecycle Methods

Tasks have several methods that can be overridden to customize their behavior. Task lifecycle methods can be used to accomplish more control when implementing for example task inheritance. However, this functionality is mostly intended for more advanced use cases, and should be avoided if possible.

Task lifecycle methods are added as class methods on tasks.

init

Tasks should never override the default python __init__() constructor, so the framework provides its own initialization function, init(). It is called before before() and must be a synchronous python function.

def init(self) -> None:
    pass

before

The before() hook is called immediately before run(). All task inputs are passed as a dict, and before() can be used to modify the task inputs before the run() function is executed.

# inputs can be modified before run() is executed:
async def before(self, inputs: dict) -> dict:
    inputs['new_input'] = 2
    return inputs

after

The after() hook can be used to perform actions after the task has finished, such as cleaning up any running child tasks.

async def after(self, inputs: dict) -> None:
    return