如何将电子邮件服务移动到线程中？

Question

我正在使用 Feign 连接两个微服务。其中一位撰写电子邮件，另一位发送电子邮件。

这是电子邮件客户端：

@FeignClient("holiday-client")
public interface EmailClient {
    @RequestMapping(value = "/api/email/sendEmail", method = RequestMethod.POST)
    void sendEmail(@RequestBody Email email);
}

撰写电子邮件的服务：

@Service
public class EmailService {
    @Autowired
    private EmailClient emailClient;

    public void sendEmailForNewCampaign() {
        String to, subject, body;

        to = "test@domain.com";
        subject = "A new campaign has started";
        body = "This email has the purpose to inform you that a new campaign has been started. Please start your own performance reviews until it ends.";
        Email email = new Email(to, subject, body);
        emailClient.sendEmail(email);
    }
}

以及实际发送电子邮件的其他微服务的控制器：

@RestController
public class EmailController {

    @Autowired
    private EmailSender emailSender;

    @RequestMapping(value = "/api/email/sendEmail", method = RequestMethod.POST)
    public ResponseEntity sendEmail(@RequestBody Email email) {
        System.out.println(email); //printed 5 times
        emailSender.sendMail(email.getTo(), email.getSubject(), email.getBody());
        return new ResponseEntity(HttpStatus.ACCEPTED);
    }
}

似乎这个 API 被调用了 5 次，直到处理并发送了电子邮件。它有效，因为我收到了 5 封电子邮件，但我也收到了 SocketTimeOutException。问题是客户端等待电子邮件服务发送邮件的时间太长，我不希望这样。如何将方法 sendMail 移动到线程中以解决此问题？

Answer 1

在您的服务（或方法）上使用@Async 注释。

@Service
@Async
public class EmailService

不要忘记@EnableAsync

如何将电子邮件服务移动到线程中？

How to move an email service into a thread?

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microservices

netflix-feign