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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_IVOICEAGENTSCHANGEOBSERVER_H_
+#define VSHL_COMMON_INTERFACES_IVOICEAGENTSCHANGEOBSERVER_H_
+
+#include <memory>
+#include <string>
+
+#include "interfaces/voiceagents/IVoiceAgent.h"
+
+using namespace std;
+
+namespace vshl {
+namespace common {
+namespace interfaces {
+
+/*
+ * This interface is used to observe changes to the voiceagents datastore.
+ * The voiceagents data store is contained in the voiceagents module.
+ */
+class IVoiceAgentsChangeObserver {
+public:
+ /**
+ * This method notifies the observers that the default voiceagent selection
+ * has been updated.
+ */
+ virtual void
+ OnDefaultVoiceAgentChanged(shared_ptr<IVoiceAgent> defaultVoiceAgent) = 0;
+
+ /**
+ * This method notifies the observers that a new voiceagent has been added.
+ */
+ virtual void OnVoiceAgentAdded(shared_ptr<IVoiceAgent> voiceAgent) = 0;
+
+ /**
+ * This method notifies the observers that a voiceagent is removed.
+ */
+ virtual void OnVoiceAgentRemoved(shared_ptr<IVoiceAgent> voiceAgent) = 0;
+
+ /**
+ * This method notifies the observers that active wakeword for a voiceagent is
+ * updated.
+ */
+ virtual void
+ OnVoiceAgentActiveWakeWordChanged(shared_ptr<IVoiceAgent> voiceAgent) = 0;
+
+ /**
+ * This method notifies the observers that the voiceagent has been activated.
+ */
+ virtual void OnVoiceAgentActivated(shared_ptr<IVoiceAgent> voiceAgent) = 0;
+
+ /**
+ * This method notifies the observers that the voiceagent has been activated.
+ */
+ virtual void OnVoiceAgentDeactivated(shared_ptr<IVoiceAgent> voiceAgent) = 0;
+
+ /**
+ * Virtual destructor to assure proper cleanup of derived types.
+ */
+ virtual ~IVoiceAgentsChangeObserver() = default;
+};
+
+} // namespace interfaces
+} // namespace common
+} // namespace vshl
+
+#endif // VSHL_COMMON_INTERFACES_IVOICEAGENTSCHANGEOBSERVER_H_