How to use

register

method

in

org.apache.servicecomb.foundation.common.event.EventManager

public MemberDiscovery(List<String> configCenterUri) {
 if (configCenterUri != null && !configCenterUri.isEmpty()) {
  configServerAddresses.addAll(configCenterUri);
 }
 Collections.shuffle(configServerAddresses);
 EventManager.register(this);
}

/**
 * <p>As the process of instance registry is asynchronous, the {@code AFTER_REGISTRY}
 * event should not be sent immediately after {@link RegistryUtils#run()} is invoked.
 * When the instance registry succeeds, {@link MicroserviceInstanceRegisterTask} will be posted in {@link EventManager},
 * register a subscriber to watch this event and send {@code AFTER_REGISTRY}.</p>
 *
 * <p>This method should be called before {@link RegistryUtils#run()} to avoid that the registry process is too quick
 * that the event is not watched by this subscriber.</p>
 *
 * <p>Check if {@code InstanceId} is null to judge whether the instance registry has succeeded.</p>
 */
private void triggerAfterRegistryEvent() {
 EventManager.register(new Object() {
  @Subscribe
  public void afterRegistryInstance(MicroserviceInstanceRegisterTask microserviceInstanceRegisterTask) {
   LOGGER.info("receive MicroserviceInstanceRegisterTask event, check instance Id...");
   if (!StringUtils.isEmpty(RegistryUtils.getMicroserviceInstance().getInstanceId())) {
    LOGGER.info("instance registry succeeds for the first time, will send AFTER_REGISTRY event.");
    status = SCBStatus.UP;
    triggerEvent(EventType.AFTER_REGISTRY);
    EventManager.unregister(this);
    LOGGER.info("ServiceComb is ready.");
   }
  }
 });
}

public MemberDiscovery(List<String> configCenterUri) {
 if (configCenterUri != null && !configCenterUri.isEmpty()) {
  configServerAddresses.addAll(configCenterUri);
 }
 Collections.shuffle(configServerAddresses);
 EventManager.register(this);
}

/**
 * <p>As the process of instance registry is asynchronous, the {@code AFTER_REGISTRY}
 * event should not be sent immediately after {@link RegistryUtils#run()} is invoked.
 * When the instance registry succeeds, {@link MicroserviceInstanceRegisterTask} will be posted in {@link EventManager},
 * register a subscriber to watch this event and send {@code AFTER_REGISTRY}.</p>
 *
 * <p>This method should be called before {@link RegistryUtils#run()} to avoid that the registry process is too quick
 * that the event is not watched by this subscriber.</p>
 *
 * <p>Check if {@code InstanceId} is null to judge whether the instance registry has succeeded.</p>
 */
private void triggerAfterRegistryEvent() {
 EventManager.register(new Object() {
  @Subscribe
  public void afterRegistryInstance(MicroserviceInstanceRegisterTask microserviceInstanceRegisterTask) {
   LOGGER.info("receive MicroserviceInstanceRegisterTask event, check instance Id...");
   if (!StringUtils.isEmpty(RegistryUtils.getMicroserviceInstance().getInstanceId())) {
    LOGGER.info("instance registry succeeds for the first time, will send AFTER_REGISTRY event.");
    status = SCBStatus.UP;
    triggerEvent(EventType.AFTER_REGISTRY);
    EventManager.unregister(this);
    LOGGER.info("ServiceComb is ready.");
   }
  }
 });
}