How to use javax.enterprise.event

/**
 * 
 * @param executor a specific {@link Executor} to handle observer notification
 * @return an immutable holder of an executor
 */
static NotificationOptions ofExecutor(Executor executor) {
  return builder().setExecutor(executor).build();
}

/**
 * 
 * @param optionName name of the option to set
 * @param optionValue value for the option
 * @return an immutable holder of a single option
 */
static NotificationOptions of(String optionName, Object optionValue) {
  return builder().set(optionName, optionValue).build();
}

  @Override
  public void send(String message) {
    event.fire(message);
  }
}

void receive(@Observes String greet) {
  this.greet = greet;
}

@Override
public void remoteDeviceDiscoveryStarted(Registry registry, RemoteDevice device) {
  remoteDeviceDiscoveryEvent.select(Phase.ALIVE).fire(
      new RemoteDeviceDiscovery(device)
  );
}

/**
 * 
 * @return the options builder
 */
static Builder builder() {
  return new ImmutableNotificationOptions.Builder();
}

public ImmutableNotificationOptions build() {
  return new ImmutableNotificationOptions(executor, options);
}

void receive(@Observes(notifyObserver = Reception.IF_EXISTS) String greet) {
  this.greet = greet;
}

  @Override
  public void afterShutdown() {
    registryShutdownEvent.select(new AnnotationLiteral<After>() {
    }).fire(
        new RegistryShutdown()
    );
  }
}

  @Override
  public void send(String message) {
    event.fire(message);
  }
}

public void observeCredit(@Observes @Credit Long amount) {
  current += amount;
}

@Override
public void beforeShutdown(Registry registry) {
  registryShutdownEvent.select(new AnnotationLiteral<Before>() {
  }).fire(
      new RegistryShutdown()
  );
}

@Override
public void remoteDeviceDiscoveryFailed(Registry registry, RemoteDevice device, Exception ex) {
  failedRemoteDeviceDiscoveryEvent.fire(
      new FailedRemoteDeviceDiscovery(device, ex)
  );
}

public void observeDebit(@Observes @Debit Long amount) {
  current -= amount;
}

@Override
public void localDeviceAdded(Registry registry, LocalDevice device) {
  localDeviceDiscoveryEvent.select(Phase.COMPLETE).fire(
      new LocalDeviceDiscovery(device)
  );
}

  public void beforeBeanDiscovery(@Observes BeforeBeanDiscovery event, BeanManager manager) {
    event.addScope(ViewScoped.class, true, true);
  }
}

@Override
public void localDeviceRemoved(Registry registry, LocalDevice device) {
  localDeviceDiscoveryEvent.select(Phase.BYEBYE).fire(
      new LocalDeviceDiscovery(device)
  );
}

/**
 * Initializes the extension prior to bean discovery.
 *
 * @param discovery bean discovery event
 */
public void before(@Observes BeforeBeanDiscovery discovery) {
  // Register beans manually
  discovery.addAnnotatedType(JsonWebTokenProducer.class, "TokenProducer");
}

@Override
public void remoteDeviceRemoved(Registry registry, RemoteDevice device) {
  remoteDeviceDiscoveryEvent.select(Phase.BYEBYE).fire(
      new RemoteDeviceDiscovery(device)
  );
}

@Override
public void remoteDeviceAdded(Registry registry, RemoteDevice device) {
  remoteDeviceDiscoveryEvent.select(Phase.COMPLETE).fire(
      new RemoteDeviceDiscovery(device)
  );
}