package com.gs.xky.config;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * 异步任务配置类
 * 配置专用线程池处理异步任务，避免阻塞Spring默认线程池
 */
@Configuration
@EnableAsync
public class AsyncConfig {

    private static final Logger log = LoggerFactory.getLogger(AsyncConfig.class);

    /**
     * 配置采购订单同步任务专用线程池
     * 使用有限的线程数，避免资源竞争
     */
    @Bean(name = "purchaseTaskExecutor")
    public Executor purchaseTaskExecutor() {
        log.info("创建采购订单同步任务专用线程池");

        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 核心线程数设置为1，确保同一时间只有一个采购同步任务在执行
        executor.setCorePoolSize(1);
        // 最大线程数设置为2，允许有限的并发
        executor.setMaxPoolSize(2);
        // 队列容量
        executor.setQueueCapacity(5);
        // 线程名称前缀
        executor.setThreadNamePrefix("purchase-task-");
        // 拒绝策略：当线程池已满时，调用者线程执行任务
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 等待所有任务结束后再关闭线程池
        executor.setWaitForTasksToCompleteOnShutdown(true);
        // 等待时间（秒）
        executor.setAwaitTerminationSeconds(60);
        // 初始化线程池
        executor.initialize();

        return executor;
    }

    /**
     * 配置通用异步任务线程池
     * 用于处理其他轻量级异步任务
     */
    @Bean(name = "taskExecutor")
    public Executor taskExecutor() {
        log.info("创建通用异步任务线程池");

        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        // 核心线程数
        executor.setCorePoolSize(5);
        // 最大线程数
        executor.setMaxPoolSize(10);
        // 队列容量
        executor.setQueueCapacity(25);
        // 线程名称前缀
        executor.setThreadNamePrefix("async-task-");
        // 拒绝策略：当线程池已满时，调用者线程执行任务
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 初始化线程池
        executor.initialize();

        return executor;
    }
}