package com.gk.hotwork.Config.ThreadExecutor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;


import java.lang.reflect.Method;
import java.util.concurrent.Executor;

import java.util.concurrent.ThreadPoolExecutor;

@Configuration
@EnableAsync
public class ExecutorConfig implements AsyncConfigurer {
    private Logger logger = LoggerFactory.getLogger(ExecutorConfig.class);

    /**
     * 最小线程数(核心线程数)
     */
    @Value("${threadPool.corePoolSize}")
    private int corePoolSize;
    /**
     * 最大线程数
     */
    @Value("${threadPool.maxPoolSize}")
    private int maxPoolSize;
    /**
     * 等待队列(队列最大长度)
     */
    @Value("${threadPool.queueCapacity}")
    private int queueCapacity;


    @Bean(name = "SocketTaskExecutor")
    public Executor asyncServiceExecutor() {
        logger.info("start 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);
        //配置队列大小
        executor.setQueueCapacity(queueCapacity);
        //配置线程池中的线程的名称前缀
        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;
    }

    /**
     * 异步异常处理
     *
     * @return
     */
    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new SpringAsyncExceptionHandler();
    }

    class SpringAsyncExceptionHandler implements AsyncUncaughtExceptionHandler {
        @Override
        public void handleUncaughtException(Throwable throwable, Method method, Object... obj) {
            logger.error("Exception occurs in async method", throwable.getMessage());
        }
    }


}