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diff --git a/compat/include/cynara/cynara-client-plugin.h b/compat/include/cynara/cynara-client-plugin.h
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+/*
+ *  Copyright (c) 2014-2015 Samsung Electronics Co., Ltd All Rights Reserved
+ *
+ *  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
+ */
+/**
+ * @file        src/include/cynara-client-plugin.h
+ * @author      Zofia Abramowska <z.abramowska@samsung.com>
+ * @author      Oskar Switalski <o.switalski@samsung.com>
+ * @version     1.0
+ * @brief       This file defines cynara client side of external plugin interface -
+ *              ClientPluginInterface.
+ */
+
+#ifndef CYNARACLIENTPLUGIN_H_
+#define CYNARACLIENTPLUGIN_H_
+
+#include <memory>
+
+#include <plugin/ExternalPluginInterface.h>
+#include <types/ClientSession.h>
+#include <types/PolicyResult.h>
+
+namespace Cynara {
+
+class ClientPluginInterface;
+typedef std::shared_ptr<ClientPluginInterface> ClientPluginInterfacePtr;
+
+/**
+ * A class defining external plugins interface.
+ *
+ * These plugins work inside of cynara client library. They interpret
+ * PolicyResult returned by cynara in terms of:
+ * * cacheability - tells, whether value should be cached (for e.g. policyType like
+ *                  ALLOW_ONCE should not be cached)
+ * * usability - whether cache entry can still be used (for e.g. policy allowing access for
+ *               given type)
+ * * value - translates PolicyResult to CYNARA_API_ACCESS_ALLOWED or CYNARA_API_ACCESS_DENIED
+ *
+ * Plugin implementing ClientPluginInterface must implement ExternalPluginInterface.
+ * Creation/destruction functions with signatures compatible to Cynara::create_t and
+ * Cynara::destroy_t must be provided as factories of ClientPluginInterface.
+ */
+class ClientPluginInterface : public ExternalPluginInterface {
+public:
+    /**
+     * Return entry cacheability
+     */
+    virtual bool isCacheable(const ClientSession &session, const PolicyResult &result) = 0;
+    /**
+     * Return entry usability
+     */
+    virtual bool isUsable(const ClientSession &session, const ClientSession &prevSession,
+                          bool &updateSession, PolicyResult &result) = 0;
+    /**
+     * Translate PolicyResult to CYNARA_API_ACCESS_ALLOWED or CYNARA_API_ACCESS_DENIED
+     */
+    virtual int toResult(const ClientSession &session, PolicyResult &result) = 0;
+
+    virtual ~ClientPluginInterface() {};
+};
+
+}
+
+#endif // CYNARACLIENTPLUGIN_H_