springboot异步线程池配置

springboot异步线程池配置

package com.sangfor.api.config;

import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
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.annotation.EnableScheduling;
import org.springframework.scheduling.concurrent.DefaultManagedAwareThreadFactory;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.web.servlet.config.annotation.AsyncSupportConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import javax.validation.constraints.NotNull;
import java.util.Objects;
import java.util.concurrent.ThreadPoolExecutor;

/**
 * @author: xmz
 */
@EnableAsync
@EnableScheduling
@Configuration
public class AsyncConfig implements AsyncConfigurer {

    private static final int MAX_SIZE = 500;
    private static final int QUEUE_SIZE = 500;
    private static final int KEEP_ALIVE_SECOND = 600;
    private static final int AWAIT_TERMINAL_SECOND = 60;
    private static final int CORE_SIZE = Runtime.getRuntime().availableProcessors() * 2;

    @Bean
    @Override
    public ThreadPoolTaskExecutor getAsyncExecutor() {
        ThreadPoolTaskExecutor pool = new ThreadPoolTaskExecutor();
        pool.setMaxPoolSize(MAX_SIZE);
        pool.setCorePoolSize(CORE_SIZE);
        pool.setQueueCapacity(QUEUE_SIZE);
        pool.setKeepAliveSeconds(KEEP_ALIVE_SECOND);
        pool.setAllowCoreThreadTimeOut(false);
        pool.setThreadFactory(new DefaultManagedAwareThreadFactory());
        /*
         *线程池对拒绝任务的处理策略：这里采用了CallerRunsPolicy策略，
         *表示当线程池没有处理能力的时候，该策略会直接在execute方法的调用线程中运行这个任务；
         *如果执行程序已关闭，则会丢弃该任务
         */
        pool.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        pool.setThreadNamePrefix("async-aip-");
        // 该方法用来设置线程池中任务的等待时间，如果超过这个时候还没有销毁就强制销毁，以确保应用最后能够被关闭，而不是阻塞住。
        pool.setWaitForTasksToCompleteOnShutdown(true);
        pool.setAwaitTerminationSeconds(AWAIT_TERMINAL_SECOND);
        //初始化线程池
        pool.initialize();
        return pool;
    }

    @Override
    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return null;
    }

    @Bean
    protected WebMvcConfigurer webMvcConfigurer() {
        return new WebMvcConfigurerAdapter() {
            @Override
            public void configureAsyncSupport(@NotNull AsyncSupportConfigurer configurer) {
                configurer.setTaskExecutor(Objects.requireNonNull(getAsyncExecutor()));
            }
        };
    }
}