# -*- encoding: utf-8 -*-
"""
@File    : GlobalThreadPoolObject.py
@Time    : 2024/8/20 19:49
@Author  : stephen
@Email   : zhangdongming@asj6.wecom.work
@Software: PyCharm
"""
# GlobalThreadPoolObject.py
import threading
from concurrent.futures import ThreadPoolExecutor

from AnsjerPush.config import CONFIG_EUR, CONFIG_INFO, CONFIG_CN, CONFIG_US


class GlobalThreadPool:
    _instance = None
    _lock = threading.Lock()

    def __new__(cls):
        if not cls._instance:
            with cls._lock:
                if not cls._instance:
                    cls._instance = super(GlobalThreadPool, cls).__new__(cls)

                    max_workers = 20
                    if CONFIG_INFO in (CONFIG_US, CONFIG_EUR):
                        max_workers = 100
                    elif CONFIG_INFO == CONFIG_CN:
                        max_workers = 80

                    cls._instance.executor = ThreadPoolExecutor(
                        max_workers=max_workers,
                        thread_name_prefix="global-thread-pool"
                    )

        return cls._instance

    def submit(self, fn, *args, **kwargs):
        try:
            return self.executor.submit(fn, *args, **kwargs)
        except RuntimeError as e:
            # 线程池满了等异常，抛给外面去兜底（回退机制）
            raise e

    def shutdown(self, wait=True):
        self.executor.shutdown(wait)