Question

我被CompletableFuture异常处理困住了

我的逻辑是发送电子邮件并保存此操作的状态。如果发送电子邮件引发异常，则需要将状态与异常消息一起保存。

public interface MyService {
CompletableFuture<Boolean> sendEmail(String content, String address);
CompletableFuture<StatusResult> saveStatus(String content, String address);}

处理器类当前具有此代码。它可以正常工作，但对我来说却并不优雅。我们如何摆脱在阶段之间共享状态的错误局部字段？

@Component
public class Processor {
    private static final Logger LOGGER = LoggerFactory.getLogger(Processor.class);
    @Autowired
    private MyService myService;

    public CompletableFuture<StatusResult> sendEmail(String content, String address) {
        AtomicReference<String> error = new AtomicReference<>();// just to forward error message from exception block to thenCompose
        return myService.sendEmail(content, address).exceptionally(e -> {
            LOGGER.error("Exception during send email ", e);
            error.set(e.getMessage());
            return null;
        }).thenCompose(x -> {
            if (x == null) {
                return myService.saveStatus(error.get(), address);
            } else {
                return myService.saveStatus("good", address);
            }
        });

    }
}

看起来像 handle 方法应该有所帮助，但它返回CompletableFuture的CompletableFuture

 public CompletableFuture<StatusResult> sendEmail(String content, String address) {
    CompletableFuture<CompletableFuture<StatusResult>> result = myService.sendEmail(content, address).handle((x, e) -> {
        if (e != null) {
            LOGGER.error("Exception during send email ", e);
            return myService.saveStatus("error", address);
        } else {
            return myService.saveStatus("good", address);
        }
    });
}

Answer 1

您可以预先转换为保存状态。

public CompletableFuture<String> sendEmail(String content, String address) {

    return myService.sendEmail(content, address)
            .thenApply(b -> "good")
            .exceptionally(Throwable::getMessage)
            .thenCompose(status -> myService.saveStatus(status, address));
}

Answer 2

另一种可行的解决方案：

ClientListView.getSelectionModel().getSelectedItems()

CompletableFuture然后在异常之后撰写

2 个答案: