Task
Task()-> None
Base class for a fingerprintable, serializable operation.
Subclasses declare their parameters as fields and implement run. Every instance is frozen, so a task can be shared, cached and reused; changing one means making another with update.
What run takes is what the task is given when it runs, positionally and in the order its parameters are declared; everything the task was configured with is a field. Inputs go by position rather than by name because the order they are given in is part of what the task did.
An array given as a parameter is marked read-only in place, as a patch’s data is, so that the fingerprint cannot come to describe values the task no longer holds. Nothing is copied, so the array marked is the caller’s own: pass a copy of a buffer which is still being written to.
Methods
| Name | Description |
|---|---|
| fingerprint_at | Return the fingerprint this task has at a stated version. |
| from_dict | Return the task a document describes. |
| load | Return the task a file holds; see |
| new | Create new instance with some attributed updated. |
| run | Execute the task. Subclasses must implement this. |
| save | Write this task to a file, and return where it was written. |
| to_dict | Return a document which describes this task. |
| update | Return a new task with some parameters changed. |