* ---------------------------------------------
 * JMORRIS2        <00>  UNIQUE      Registered
 * BILLING-NY      <00>  GROUP       Registered
 * JMORRIS2        <03>  UNIQUE      Registered
 * JMORRIS2        <20>  UNIQUE      Registered
 * BILLING-NY      <1E>  GROUP       Registered
 * JMORRIS         <03>  UNIQUE      Registered
 *
 * MAC Address = 00-B0-34-21-FA-3B
 * </pre>
 *
 * </blockquote>
 *

                WitnessRegisterResponse response = rpcClient.register(request);

                if (response != null && response.isSuccess()) {
                    registration.setState(WitnessRegistrationState.REGISTERED);
                    registration.setContextHandle(response.getContextHandle());
                    registrations.put(registration.getRegistrationId(), registration);

                "Transfer listener is registered before test");
        wagonManager.getArtifact(artifact, repo, transferListener, false);
        assertFalse(
                wagon.getTransferEventSupport().hasTransferListener(transferListener),
                "Transfer listener still registered after getArtifact");

        /* putArtifact */

	// and Storage/OS calls info to registered listeners.
	globalTrace = pubsub.New[madmin.TraceInfo, madmin.TraceType](8)

	// global Listen system to send S3 API events to registered listeners
	globalHTTPListen = pubsub.New[event.Event, pubsub.Mask](0)

	// global console system to send console logs to
	// registered listeners
	globalConsoleSys *HTTPConsoleLoggerSys

import org.jspecify.annotations.Nullable;

/**
 * Registry of subscribers to a single event bus.
 *
 * @author Colin Decker
 */
final class SubscriberRegistry {

  /**
   * All registered subscribers, indexed by event type.
   *
   * <p>The {@link CopyOnWriteArraySet} values make it easy and relatively lightweight to get an
   * immutable snapshot of all current subscribers to an event without any locking.
   */

                    registration.setState(WitnessRegistrationState.REGISTERED);
                    registrations.put(registration.getRegistrationId(), registration);
                    listeners.put(registration.getRegistrationId(), listener);
                    
                    log.info("Successfully registered for witness notifications: {}", 
                        registration.getRegistrationId());

	// since the `objectLayer==nil`  check is performed before any other checks inside the handlers.
	// The only aim is to generate an HTTP request in a way that the relevant/registered end point is evoked/called.

	nilBucket := "dummy-bucket"
	nilReq, err := newTestRequest(http.MethodGet, getBucketLocationURL("", nilBucket), 0, nil)
	if err != nil {

		config.KV{
			Key:   target.KafkaCompressionCodec,
			Value: "",
		},
		config.KV{
			Key:   target.KafkaCompressionLevel,
			Value: "",
		},
	}
)

// GetNotifyKafka - returns a map of registered notification 'kafka' targets
func GetNotifyKafka(kafkaKVS map[string]config.KVS) (map[string]target.KafkaArgs, error) {
	kafkaTargets := make(map[string]target.KafkaArgs)

 * ---------------------------------------------
 * JMORRIS2        <00>  UNIQUE      Registered
 * BILLING-NY      <00>  GROUP       Registered
 * JMORRIS2        <03>  UNIQUE      Registered
 * JMORRIS2        <20>  UNIQUE      Registered
 * BILLING-NY      <1E>  GROUP       Registered
 * JMORRIS         <03>  UNIQUE      Registered
 *
 * MAC Address = 00-B0-34-21-FA-3B
 * </pre>

        filterList.add(filter);
        createFilterChain();
    }

    /**
     * Creates the filter chain by combining all registered filters.
     * The chain starts with the default filter chain and appends each registered filter.
     */
    protected void createFilterChain() {
        FilterChain chain = createDefaultFilterChain();
        for (final Filter element : filterList) {