项目中用过的@Async注解使用

最新推荐文章于 2025-05-14 08:30:00 发布

原创最新推荐文章于 2025-05-14 08:30:00 发布 · 688 阅读

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#java #线程池

本文介绍了如何在Spring中配置线程池，包括核心线程数、最大线程数、存活时间和队列容量等参数，并展示了如何使用`@Async`注解实现异步任务，通过`ThreadPoolTaskExecutor`处理并发请求，提高系统性能。

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spring托管线程池配置

threadPool:
  maxPoolSize: 30
  keepAliveTime: 60
  queueCapacity: 1000
  corePoolSize: 10

@Configuration
@EnableAsync
public class ThreadPoolTaskConfig {

    @Value("${threadPool.corePoolSize}")
    private int corePoolSize;
    @Value("${threadPool.maxPoolSize}")
    private int maxPoolSize;
    @Value("${threadPool.keepAliveTime}")
    private int keepAliveTime;
    @Value("${threadPool.queueCapacity}")
    private int queueCapacity;

    private ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();

    @Bean("taskExecutor")
    public ThreadPoolTaskExecutor taskExecutor(){
        executor.setCorePoolSize(corePoolSize);
        executor.setMaxPoolSize(maxPoolSize);
        executor.setQueueCapacity(queueCapacity);
        executor.setKeepAliveSeconds(keepAliveTime);
        // 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;
    }
}

使用

// 省略service接口
@Service
public class ChannelPageServiceImpl implements ChannelPageService {
    @Resource
    private ChannelPageAsyncService channelPageAsyncService;
    @Override
    public ChannelPageDTO getChannelPage(Long userId, RequestTerminal terminal) throws Exception {
        ChannelPageDTO channelPage = new ChannelPageDTO();
        Future<WelfareDTO> welFareFuture1 = channelPageAsyncService.getWelFareVOByType();
        Future<WelfareDTO> welFareFuture2 = channelPageAsyncService.getWelFareVOByType();
        Future<ArticleDTO> articleFuture = channelPageAsyncService.getArticleVO();
        Future<CardDTO> cardDTOFuture = channelPageAsyncService.getCardDTO();
        
        // 最后统一get（get操作是阻塞操作）
        WelfareDTO welfareDTO1 = welFareFuture1.get();
        WelfareDTO welfareDTO2 = welFareFuture2.get();
        ArticleDTO articleDTO = articleFuture.get();
        cardDTO = cardDTOFuture.get();

        channelPage.setWelfareDTO1(welfareDTO1);
        channelPage.setWelfareDTO2(welfareDTO2);
        channelPage.setArticleDTO(articleDTO);
        channelPage.setCardDTO(cardDTO);
        return channelPage;
    }
}

// 省略service接口
// 此注解可以加载类上也可以加在方法上
@Async(value = "taskExecutor")
@Slf4j
@Service
public class ChannelPageAsyncServiceImpl implements ChannelPageAsyncService {
    @Override
    public Future<WelfareDTO> getWelFareVOByType() {
        WelfareDTO welfareDTO = new WelfareDTO();
        // doSth
        return new AsyncResult<>(welfareDTO);
    }
    
    @Override
    public Future<ArticleDTO> getArticleVO() {
        ArticleDTO articleDTO = new ArticleDTO();
        // // doSth
        return new AsyncResult<>(articleDTO);
    }

    // 省略其他方法
}