package com.usky.iot.service.config;

import lombok.extern.slf4j.Slf4j;
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;

@Configuration
@EnableAsync
@Slf4j
public class ExecutorConfig {

   /** 核心线程数(默认线程数) */
   private int corePoolSize = 20;
   /** 最大线程数 */
   private int maxPoolSize = 100;
   /** 允许线程空闲时间（单位：默认为秒） */
   private static final int keepAliveTime = 60;
   /** 缓冲队列大小 */
   private int queueCapacity = 100;

   @Bean(name = "asyncServiceExecutor")
   public Executor asyncServiceExecutor(){
       ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
       //配置核心线程数
       executor.setCorePoolSize(corePoolSize);
       //配置最大线程数
       executor.setMaxPoolSize(maxPoolSize);
       //配置空闲时间
       executor.setKeepAliveSeconds(keepAliveTime);
       //配置队列大小
       executor.setQueueCapacity(queueCapacity);
       //配置线程前缀名
       executor.setThreadNamePrefix("async-service-");

       // rejection-policy：当pool已经达到max size的时候，如何处理新任务
       // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
       executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());

       //执行初始化
       executor.initialize();
       return executor;
   }
}
