类ConsulAutoRegistration

bean的构造方式

在类 ConsulAutoServiceRegistrationAutoConfiguration 中，通过下面的方式构造 ConsulAutoRegistration 的 bean:

@Bean
@ConditionalOnMissingBean
public ConsulAutoRegistration consulRegistration(ConsulDiscoveryProperties properties, ApplicationContext applicationContext,
                                             ServletContext servletContext, HeartbeatProperties heartbeatProperties) {
    return ConsulAutoRegistration.registration(properties, applicationContext, servletContext, heartbeatProperties);

这里和 ConsulServiceRegistry 与 ConsulRegistration 的方式很不相同. ConsulAutoRegistration 作为一个标准的spring bean 给 ConsulAutoServiceRegistration 使用,单例.而ConsulRegistration 是通过方法传递给 ConsulServiceRegistry.如register()方法:

public void register(ConsulRegistration reg) {......}

registration()方法的实现

public static ConsulAutoRegistration registration(ConsulDiscoveryProperties properties, ApplicationContext context,　ServletContext servletContext, HeartbeatProperties heartbeatProperties) {
    RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(context.getEnvironment());

    NewService service = new NewService();
    // 取应用名
    String appName = getAppName(properties, propertyResolver);
    // 取ID
    service.setId(getInstanceId(properties, context));
    if(!properties.isPreferAgentAddress()) {
        service.setAddress(properties.getHostname());
    }
    service.setName(normalizeForDns(appName));
    // 取tag
    service.setTags(createTags(properties, servletContext));

    if (properties.getPort() != null) {
        service.setPort(properties.getPort());
        // we know the port and can set the check
        setCheck(service, properties, context, heartbeatProperties);
    }
    // 最后返回ConsulAutoRegistration对象
    return new ConsulAutoRegistration(service, properties, context, heartbeatProperties);
}

类定义

ConsulAutoRegistration 定义如下：

// 继承自ConsulRegistration
public class ConsulAutoRegistration extends ConsulRegistration {
    // 增加了三个属性
    private final ConsulDiscoveryProperties properties;
    private final ApplicationContext context;
    private final HeartbeatProperties heartbeatProperties;

    public ConsulAutoRegistration(NewService service, ConsulDiscoveryProperties properties, ApplicationContext context, HeartbeatProperties heartbeatProperties) {
        super(service);
        this.properties = properties;
        this.context = context;
        this.heartbeatProperties = heartbeatProperties;
    }
}