diff --git a/tutorial/cl/shared-implementation.lisp b/tutorial/cl/shared-implementation.lisp
new file mode 100644
index 0000000..c197626
--- /dev/null
+++ b/tutorial/cl/shared-implementation.lisp
@@ -0,0 +1,25 @@
+(in-package #:shared-implementation)
+
+;;;; Licensed under the Apache License, Version 2.0 (the "License");
+;;;; you may not use this file except in compliance with the License.
+;;;; You may obtain a copy of the License at
+;;;;
+;;;;     http://www.apache.org/licenses/LICENSE-2.0
+;;;;
+;;;; Unless required by applicable law or agreed to in writing, software
+;;;; distributed under the License is distributed on an "AS IS" BASIS,
+;;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+;;;; See the License for the specific language governing permissions and
+;;;; limitations under the License.
+
+(defvar *structs* (make-hash-table))
+
+(defun shared.shared-service-implementation:get-struct (key)
+  (format t "getStruct(~a)~%" key)
+  (gethash key *structs*))
+
+(defun add-log (key value)
+  (setf (gethash key *structs*)
+        (make-instance 'shared:sharedstruct
+                       :key key
+                       :value (write-to-string value))))