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

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)

                    # 设置默认值
                    max_workers = 20
                    queue_size = 200000

                    # 根据配置调整线程池参数 目前*2倍
                    # 创建一个全局的线程池实例
                    # 线程池最大数量
                    # 1、CPU密集型：操作内存处理的业务，一般线程数设置为：CPU核数 + 1 或者 CPU核数*2。核数为4的话一般设置5或8
                    # 2、IO密集型：文件操作，网络操作，数据库操作，一般线程设置为：CPU核数 / (1-0.9)，核数为4的话，一般设置 40
                    if CONFIG_INFO == CONFIG_US or CONFIG_INFO == CONFIG_EUR:
                        max_workers = 200
                    elif CONFIG_INFO == CONFIG_CN:
                        max_workers = 100

                    # 创建线程池
                    cls._instance.executor = ThreadPoolExecutor(
                        max_workers=max_workers,
                        thread_name_prefix="global-thread-pool"
                    )

                    # 设置阻塞队列大小
                    cls._instance.queue = Queue(maxsize=queue_size)

        return cls._instance

    def submit(self, fn, *args, **kwargs):
        if self.queue.full():
            raise Exception("Task queue is full, rejecting new tasks")
        else:
            self.queue.put(None)  # 占位符，表示提交了一个任务
            return self.executor.submit(fn, *args, **kwargs)

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


# 用法示例：
class SomeService:
    def some_method(self, **params):
        thread_pool = GlobalThreadPool()
        thread_pool.submit(self.some_task, **params)

    def some_task(self, **params):
        pass