synergine2/synergine2/core.py

# coding: utf-8
import time
from synergine2.cycle import CycleManager
from synergine2.simulation import Simulation
from synergine2.terminals import TerminalManager
from synergine2.terminals import TerminalPackage


class Core(object):
    def __init__(
        self,
        simulation: Simulation,
        cycle_manager: CycleManager,
        terminal_manager: TerminalManager=None,
        cycles_per_seconds: int=1,
    ):
        self.simulation = simulation
        self.cycle_manager = cycle_manager
        self.terminal_manager = terminal_manager or TerminalManager([])
        self._loop_delta = 1./cycles_per_seconds
        self._current_cycle_start_time = None

    def run(self):
        try:
            self.terminal_manager.start()

            start_package = TerminalPackage(
                subjects=self.simulation.subjects,
            )
            self.terminal_manager.send(start_package)

            while True:
                self._start_cycle()

                events = []
                packages = self.terminal_manager.receive()
                for package in packages:
                    events.extend(self.cycle_manager.apply_actions(
                        simulation_actions=package.simulation_actions,
                        subject_actions=package.subject_actions,
                    ))

                events.extend(self.cycle_manager.next())
                cycle_package = TerminalPackage(
                    events=events,
                    add_subjects=self.simulation.subjects.adds,
                    remove_subjects=self.simulation.subjects.removes,
                    is_cycle=True,
                )
                self.terminal_manager.send(cycle_package)

                # Reinitialize these list for next cycle
                self.simulation.subjects.adds = []
                self.simulation.subjects.removes = []

                self._end_cycle()
        except KeyboardInterrupt:
            pass  # Just stop while
        self.terminal_manager.stop()

    def _start_cycle(self):
        self._current_cycle_start_time = time.time()

    def _end_cycle(self) -> None:
        """
        Make a sleep if cycle duration take less time of wanted (see
        cycles_per_seconds constructor parameter)
        """
        cycle_duration = time.time() - self._current_cycle_start_time
        sleep_time = self._loop_delta - cycle_duration
        if sleep_time > 0:
            time.sleep(sleep_time)