Add first version

First version of C++ SDL API.

Refer README file for instructions how to generate API documentation.

Current version will find database via environment variables, thus RIC
DBaaS service must be up and running before starting the application
pod which uses SDL C++ API.

Change-Id: Ia3c95ac856b293827b680a9f6451a229f69f35f9
Signed-off-by: Rolf Badorek <rolf.badorek@nokia.com>
diff --git a/include/private/asyncconnection.hpp b/include/private/asyncconnection.hpp
new file mode 100644
index 0000000..848f0e2
--- /dev/null
+++ b/include/private/asyncconnection.hpp
@@ -0,0 +1,71 @@
+/*
+   Copyright (c) 2018-2019 Nokia.
+
+   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.
+*/
+
+#ifndef SHAREDDATALAYER_ASYNCCONNECTION_HPP_
+#define SHAREDDATALAYER_ASYNCCONNECTION_HPP_
+
+#include <cstdint>
+#include <functional>
+#include <map>
+#include <memory>
+#include <set>
+#include <string>
+#include <system_error>
+#include <utility>
+#include <vector>
+#include <sdl/errorqueries.hpp>
+
+namespace shareddatalayer
+{
+    /**
+     * @brief Deprecated API, some type definitions left because still used by other classes in SDL implementation.
+     */
+    class AsyncConnection
+    {
+    public:
+        /**
+         * Separator defines the character that API uses to logically separate the namespace
+         * and the key when forming an SDL key. Thus, the separator character cannot be part
+         * of the namespace string. Also namespace identifier cannot be an empty string.
+         *
+         * The character used as separator is <code>,</code>
+         *
+         * API otherwise does not impose additional restrictions to used characters, though
+         * excessive and unnecessary usage of special characters is strongly discouraged.
+         */
+        static const char SEPARATOR;
+
+        using Key = std::string;
+
+        using Data = std::vector<uint8_t>;
+
+        using DataMap = std::map<Key, Data>;
+
+        using Keys = std::set<Key>;
+
+        using Namespace = std::string;
+
+        /**
+         * publisherId: Identification that can be set by a publisher to identify the source of
+         *              the modification. Process that is modifying data in a namespace and is
+         *              also subscribed to the same namespace can utilize the publisherId to
+         *              distinguish events that it published itself.
+         */
+        using PublisherId = std::string;
+    };
+}
+
+#endif