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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_IEVENTFILTER_H_
+#define VSHL_COMMON_INTERFACES_IEVENTFILTER_H_
+
+#include <string>
+
+using namespace std;
+
+namespace vshlcapabilities {
+namespace common {
+namespace interfaces {
+/*
+ * This is an abstract class that is responsible for filtering the events
+ * that are delivered to the high level voice service from apps or voiceagents.
+ */
+class IEventFilter {
+public:
+ // Name of the event filter.
+ virtual string getName() = 0;
+
+ // Every event filter needs to implement this method and
+ // return true if consuming the event or false otherwise.
+ virtual bool onIncomingEvent(const string eventName, const string voiceAgentId, const string payload) = 0;
+
+ // Destructor
+ virtual ~IEventFilter() = default;
+};
+
+} // namespace interfaces
+} // namespace common
+} // namespace vshl
+
+#endif // VSHL_COMMON_INTERFACES_IEVENTFILTER_H_