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+/*
+ * Copyright 2018-2019 Amazon.com, Inc. or its affiliates. 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.
+ * A copy of the License is located at
+ *
+ * http://aws.amazon.com/apache2.0/
+ *
+ * or in the "license" file accompanying this file. This file 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 VSHL_COMMON_INTERFACES_AFBAPI_H_
+#define VSHL_COMMON_INTERFACES_AFBAPI_H_
+
+#include <memory>
+#include <string>
+
+#include <json-c/json_object.h>
+
+using namespace std;
+
+namespace vshl {
+namespace common {
+namespace interfaces {
+
+/**
+ * Interface to represent AFB Request.
+ */
+class IAFBRequest {
+public:
+ /**
+ * Gets the native request object.
+ */
+ virtual void* getNativeRequest() = 0;
+};
+
+/**
+ * Interface to encapsulate all AFB (AGL Application Framework Binding)
+ * functions.
+ */
+class IAFBApi {
+public:
+ /**
+ * Interface to represent AFB Event
+ */
+ class IAFBEvent {
+ public:
+ /**
+ * Gets human readable name of the event.
+ */
+ virtual std::string getName() const = 0;
+
+ /**
+ * Returns true if event is valid. False otherwise.
+ */
+ virtual bool isValid() = 0;
+
+ /**
+ * Publish event to all observers.
+ *
+ * @return The number of observers that received the event.
+ */
+ virtual int publishEvent(struct json_object* payload) = 0;
+
+ /**
+ * Subscribe to the event
+ *
+ * @c request Party interested in the event.
+ */
+ virtual bool subscribe(IAFBRequest& request) = 0;
+
+ /**
+ * Unsubscribe to the event
+ *
+ * @c request Party no longer interested in the event.
+ */
+ virtual bool unsubscribe(IAFBRequest& request) = 0;
+ };
+
+ virtual std::shared_ptr<IAFBEvent> createEvent(const std::string& eventName) = 0;
+
+ virtual int callSync(
+ const std::string& api,
+ const std::string& verb,
+ struct json_object* request,
+ struct json_object** result,
+ std::string& error,
+ std::string& info) = 0;
+};
+
+} // namespace interfaces
+} // namespace common
+} // namespace vshl
+
+#endif // VSHL_COMMON_INTERFACES_AFBAPI_H_