Actor action time scheduler

scheduler.py

# scheduler.py - scheduling entity actions
import collections
import numbers


class Scheduler(object):
    """
    Schedule entity actions
    """
    def __init__(self, actors, start_time=0):
        if not issubclass(actors, collections.Mapping):
            raise TypeError("actors must be subclass of Mapping")
        if start_time and not issubclass(start_time, numbers.Number):
            raise TypeError("current_time must be a subclass of Number")
        self.actors = actors
        self.start_time = start_time
        super(Scheduler, self).__init__()
    
    def current_actors(self, delta_time, blocking_id =0):
        time_next = self.start_time + delta_time
        if blocking_id:
            block_time = self.actors[blocking_id].action_time
            if block_time < time_next:
                if block_time < (self.start_time + 0.001):
                    return [] # first actor would block
                time_next = block_time
        rval = [(v.action_time, k, v) for k, v in self.actors.items()
                if v.action_time < time_next ]
        rval.sort()
        self.start_time = time_next
        return rval

    def modify_time(self, actor_id, modifier, start_time=0):
        start_time = start_time or self.start_time
        actor = self.actors[actor_id]
        delta_time = actor.action_time - start_time
        actor.action_time = start_time + (delta_time * modifier)