SpringBoot多线程异步查询

1.创建线程池：

ThreadPoolConfig

import java.util.concurrent.ThreadPoolExecutor;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

@Configuration
public class ThreadPoolConfig {
    
    /** 核心线程数（默认线程数） */
    private static final int corePoolSize = 5;
    /** 最大线程数 */
    private static final int maxPoolSize = 8;
    /** 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 static final int queueCapacity = 100;
    /** 线程池名前缀 */
    private static final String threadNamePrefix = "DirectSearchEsService-";

    @Bean("taskExecutor") // bean的名称，默认为首字母小写的方法名
    public ThreadPoolTaskExecutor taskExecutor(){
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setKeepAliveSeconds(keepAliveTime);
        executor.setThreadNamePrefix(threadNamePrefix);

        // 线程池对拒绝任务的处理策略
        // CallerRunsPolicy：由调用线程（提交任务的线程）处理该任务
        executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        // 初始化
        executor.initialize();
        return executor;
    }
}

2.启动类开启异步：

启动类

@SpringBootApplication
@EnableTransactionManagement
@EnableAsync
public class WalletMaintainApplication {
    public static void main(String[] args) {
        SpringApplication.run(WalletMaintainApplication.class, args);
    }
}

3.编写异步方法：

blockChainUtil

@Service
public class blockChainUtil {
    //线程池bean名称，可不填。
    @Async("taskExecutor")
    public Future<ArrayList> getBatchBalance(ArrayList accountList, Integer index){
        ArrayList<Object> balanceList = new ArrayList<>();
                //此处省略部分业务处理过程
        //多线程异步执行返回值必须为Future类型。
        return new AsyncResult<>(balanceList);
    }
}

4.调用异步方法：

getAllUser

    @DS("Local")
    @Async("taskExecutor")
    @Override
    public Map getAllUser() {
        //获取所有用户数据
        List<UserAccountInfoBean> userAccountInfoBeans = baseMapper.selectList(null);
        System.out.println("一共有" + userAccountInfoBeans.size() + "个用户！");
        //根据总用户数量分割，30000用户一组。
        List<List<String>> lists = Lists.partition(userAccountInfoBeans, 30000);
        //执行多线程任务
        BlockingQueue<Future<ArrayList>> queue = new LinkedBlockingQueue();
        Future<ArrayList> future;
        //循环调用查询
        for (int i = 0; i < lists.size(); i++) {
            List<String> itemList = castList(lists.get(i), String.class);
            Integer index = i + 1;
            future = blockChainUtil.getBatchBalance((ArrayList) itemList, index);
            queue.add(future);
        }
        //拼装结果
        for (int i = 0; i < queue.size(); i++) {
            ArrayList batchBalance = null;
            try {
                batchBalance = queue.take().get();
            } catch (InterruptedException e) {
                System.out.println("服务中断异常！");
            } catch (ExecutionException e) {
                System.out.println("服务执行异常！");
            }
            //取实际返回的有效数据
            for (int j = 0; j < batchBalance.size(); j++) {
                String str = batchBalance.get(j).toString();
                //此处省略部分业务处理过程
            }
        }
        return null;
    }

SpringBoot多线程异步查询