package com.glxp.api.config;

import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.ThreadPoolExecutor;

/**
 * 配置线程池
 */
@EnableAsync
@Configuration
@EnableConfigurationProperties(ThreadPoolConfigProperties.class)
public class TaskPoolConfig {

//    @Bean(name = "taskExecutor")
//    @Primary
//    public ThreadPoolTaskExecutor taskExecutor() {
//        // 获取当前主机的cpu核心数
//        int threadCount = Runtime.getRuntime().availableProcessors();
//        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
//        //核心池的大小
//        taskExecutor.setCorePoolSize(threadCount);
//        //线程池最大线程数
//        taskExecutor.setMaxPoolSize(threadCount * 2);
//        //队列最大长度
//        taskExecutor.setQueueCapacity(200);
//        //线程空闲时间
//        taskExecutor.setKeepAliveSeconds(60);
//        //配置线程前缀
//        taskExecutor.setThreadNamePrefix("custom_executor");
//        //配置拒绝策略
//        taskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
//        //执行初始化
//        taskExecutor.initialize();
//        return taskExecutor;
//    }

    @Bean(name = "taskExecutor")
    @Primary
    public ThreadPoolTaskExecutor taskExecutor(ThreadPoolConfigProperties properties) {
        // 动态获取CPU核心数
        final int cpuCores = Runtime.getRuntime().availableProcessors();

        ThreadPoolTaskExecutor taskExecutor = new ThreadPoolTaskExecutor();
        // 核心线程数（配置优先，默认CPU核心数）
        taskExecutor.setCorePoolSize(
                properties.getCorePoolSize() != null ?
                        properties.getCorePoolSize() : cpuCores
        );

        // 最大线程数（配置优先，默认CPU核心数*2）
        taskExecutor.setMaxPoolSize(
                properties.getMaxPoolSize() != null ?
                        properties.getMaxPoolSize() : cpuCores * 2
        );

        // 其他固定配置项
        taskExecutor.setQueueCapacity(properties.getQueueCapacity());
        taskExecutor.setKeepAliveSeconds(properties.getKeepAliveSeconds());
        taskExecutor.setThreadNamePrefix(properties.getThreadNamePrefix());

        // 拒绝策略保持原样
        taskExecutor.setRejectedExecutionHandler(
                new ThreadPoolExecutor.CallerRunsPolicy()
        );

        taskExecutor.initialize();
        return taskExecutor;
    }

}