ctx := newContext(r, w, "ListenNotification")

	defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))

	// Validate if bucket exists.
	objAPI := api.ObjectAPI()
	if objAPI == nil {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
		return
	}

	vars := mux.Vars(r)
	bucketName := vars["bucket"]

	if bucketName == "" {

	globalObjLayerMutex.Lock()
	globalObjectAPI = o
	globalObjLayerMutex.Unlock()
}

// objectAPIHandlers implements and provides http handlers for S3 API.
type objectAPIHandlers struct {
	ObjectAPI func() ObjectLayer
}

// getHost tries its best to return the request host.
// According to section 14.23 of RFC 2616 the Host header
// can include the port number if the default value of 80 is not used.

		defer logger.AuditLog(r.Context(), w, r, mustGetClaimsFromToken(r))

		// Check if object layer is available, if not return error early.
		if !handlerFlags.Has(noObjLayerFlag) {
			objectAPI := newObjectLayerFn()
			if objectAPI == nil || globalNotificationSys == nil {
				writeErrorResponseJSON(r.Context(), w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
				return
			}
		}

	objectAPI := newObjectLayerFn()
	if objectAPI == nil {
		return errSRObjectLayerNotReady
	}

	if item.Bucket == "" || item.UpdatedAt.IsZero() {
		return wrapSRErr(errInvalidArgument)
	}

	meta, err := readBucketMetadata(ctx, objectAPI, item.Bucket)
	if err != nil {
		return wrapSRErr(err)
	}

	}
	return st.Clone()
}

// NewReplicationStats initialize in-memory replication statistics
func NewReplicationStats(ctx context.Context, objectAPI ObjectLayer) *ReplicationStats {
	r := metrics.NewRegistry()
	rs := ReplicationStats{
		Cache:           make(map[string]*BucketReplicationStats),
		qCache:          newQueueCache(r),

			expectedRespStatus: http.StatusBadRequest,
		},

		// Test case - 8.
		// Test case with non-existent source file.
		// Case for the purpose of failing `api.ObjectAPI.GetObjectInfo`.
		// Expecting the response status code to http.StatusNotFound (404).
		{
			bucketName:       bucketName,
			uploadID:         uploadID,

	// When cache is enabled, Put and Get operations are passed
	// to underlying cache layer to manage object layer operation and disk caching
	// operation
	api := objectAPIHandlers{
		ObjectAPI: func() ObjectLayer {
			return globalObjectAPI
		},
	}

	// Register ListBuckets	handler.
	apiRouter.Methods(http.MethodGet).HandlerFunc(api.ListBucketsHandler)
	// Register all bucket level handlers.