25 lines
No EOL
774 B
Python
25 lines
No EOL
774 B
Python
import functools
|
|
from symtable import Function
|
|
from typing import List, Callable, Generator
|
|
|
|
from api.od import ODAPI
|
|
from .singleton import Singleton
|
|
|
|
from .exec_node import ExecNode
|
|
|
|
class NullNode(ExecNode, metaclass=Singleton):
|
|
def __init__(self):
|
|
ExecNode.__init__(self, out_connections=0)
|
|
|
|
def execute(self, od: ODAPI) -> Generator | None:
|
|
raise Exception('Null node should already have terminated the schedule')
|
|
|
|
@staticmethod
|
|
def terminate(od: ODAPI):
|
|
return None
|
|
yield # verrrry important line, dont remove this unreachable code
|
|
|
|
def generate_dot(self, nodes: List[str], edges: List[str], visited: set[int]) -> None:
|
|
if self.id in visited:
|
|
return
|
|
nodes.append(f"{self.id}[label=Null]") |