springboot @async线程池使用以及oom问题

springboot @async线程池使用以及oom问题

声明线程池

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.ThreadPoolExecutor;


@Configuration
@EnableAsync
public class ExecutorConfig1 {

    @Bean("taskExecutor")
    public ThreadPoolTaskExecutor threadPoolTaskExecutor() {
        ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
        threadPoolTaskExecutor.setCorePoolSize(10);
        threadPoolTaskExecutor.setMaxPoolSize(10);
        threadPoolTaskExecutor.setQueueCapacity(20);
        threadPoolTaskExecutor.setKeepAliveSeconds(3000);
        threadPoolTaskExecutor.setThreadNamePrefix("Async-Service-");
        threadPoolTaskExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        return threadPoolTaskExecutor;
    }
}

业务逻辑类

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.ArrayList;


@Component
public class QueryDataExec {

    @Autowired
    private TaskDataExec taskDataExec;

    public void execData() {
        ArrayList<String> list = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            taskDataExec.taskDataExec("id-" + i);
        }

    }
}

逻辑执行类,注意@Asycn 的处理类不能和调用一个类

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;


@Component
public class TaskDataExec {
    Logger log = LoggerFactory.getLogger(TaskDataExec.class);

    @Async("taskExecutor")
    public void taskDataExec(String id) {
        log.info("开始处理：" + id);
        log.info("完成处理：" + id);
    }
}

测试类

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class UdpApplicationTests {

    @Test
    void contextLoads() {
        System.out.println("123");
    }

    @Autowired
    private QueryDataExec queryDataExec;

    @Test
    public void dataExecTest() {
        queryDataExec.execData();
    }
}

效果,注意Async-Service后面的数字是对应的线程池

2021-04-13 16:17:19.290  INFO 7280 --- [Async-Service-1] com.udp.TaskDataExec                     : 开始处理：id-0
2021-04-13 16:17:19.291  INFO 7280 --- [Async-Service-1] com.udp.TaskDataExec                     : 完成处理：id-0
2021-04-13 16:17:19.292  INFO 7280 --- [Async-Service-3] com.udp.TaskDataExec                     : 开始处理：id-2
2021-04-13 16:17:19.292  INFO 7280 --- [Async-Service-3] com.udp.TaskDataExec                     : 完成处理：id-2
2021-04-13 16:17:19.303  INFO 7280 --- [Async-Service-2] com.udp.TaskDataExec                     : 开始处理：id-1
2021-04-13 16:17:19.303  INFO 7280 --- [Async-Service-2] com.udp.TaskDataExec                     : 完成处理：id-1
2021-04-13 16:17:19.304  INFO 7280 --- [Async-Service-4] com.udp.TaskDataExec                     : 开始处理：id-3
2021-04-13 16:17:19.306  INFO 7280 --- [Async-Service-4] com.udp.TaskDataExec                     : 完成处理：id-3
2021-04-13 16:17:19.309  INFO 7280 --- [Async-Service-5] com.udp.TaskDataExec                     : 开始处理：id-4
2021-04-13 16:17:19.309  INFO 7280 --- [Async-Service-5] com.udp.TaskDataExec                     : 完成处理：id-4
2021-04-13 16:17:19.312  INFO 7280 --- [Async-Service-6] com.udp.TaskDataExec                     : 开始处理：id-5
2021-04-13 16:17:19.312  INFO 7280 --- [Async-Service-6] com.udp.TaskDataExec                     : 完成处理：id-5
2021-04-13 16:17:19.315  INFO 7280 --- [Async-Service-7] com.udp.TaskDataExec                     : 开始处理：id-6
2021-04-13 16:17:19.316  INFO 7280 --- [Async-Service-7] com.udp.TaskDataExec                     : 完成处理：id-6
2021-04-13 16:17:19.316  INFO 7280 --- [sync-Service-10] com.udp.TaskDataExec                     : 开始处理：id-9
2021-04-13 16:17:19.316  INFO 7280 --- [sync-Service-10] com.udp.TaskDataExec                     : 完成处理：id-9
2021-04-13 16:17:19.316  INFO 7280 --- [Async-Service-8] com.udp.TaskDataExec                     : 开始处理：id-7
2021-04-13 16:17:19.317  INFO 7280 --- [Async-Service-8] com.udp.TaskDataExec                     : 完成处理：id-7
2021-04-13 16:17:19.318  INFO 7280 --- [Async-Service-9] com.udp.TaskDataExec                     : 开始处理：id-8
2021-04-13 16:17:19.318  INFO 7280 --- [Async-Service-9] com.udp.TaskDataExec                     : 完成处理：id-8

说一说@Async默认的效果每次调用都创建新的线程，具体可以看看这个文章
https://blog.csdn.net/ignorewho/article/details/85603920