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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_CAPABILITIES_CAPABILITYMESSAGINGSERVICE_H_
+#define VSHL_CAPABILITIES_CAPABILITYMESSAGINGSERVICE_H_
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+#include "capabilities/core/include/MessageChannel.h"
+#include "interfaces/afb/IAFBApi.h"
+#include "interfaces/capabilities/ICapability.h"
+#include "interfaces/utilities/logging/ILogger.h"
+
+using namespace std;
+
+namespace vshl {
+namespace capabilities {
+/*
+ * This hosts service APIs that clients can use to subscribe and
+ * forward capability messages. Each capability has a name and
+ * direction (upstream/downstream). Upstream messages are from
+ * voiceagents to Apps and downstream messages are Apps to voiceagents.
+ * This class will use a factory to create publisher and subcribers for
+ * each capability and create assiociations between them.
+ */
+class CapabilityMessagingService {
+public:
+ // Create a CapabilityMessagingService.
+ static std::unique_ptr<CapabilityMessagingService>
+ create(shared_ptr<vshl::common::interfaces::ILogger> logger,
+ shared_ptr<vshl::common::interfaces::IAFBApi> afbApi);
+
+ // Subscribe to capability specific messages.
+ bool subscribe(vshl::common::interfaces::IAFBRequest &request,
+ shared_ptr<common::interfaces::ICapability> capability,
+ const string action);
+
+ // Publish capability messages.
+ bool publish(shared_ptr<common::interfaces::ICapability> capability,
+ const string action, const string payload);
+
+ // Destructor
+ ~CapabilityMessagingService();
+
+private:
+ // Constructor
+ CapabilityMessagingService(
+ shared_ptr<vshl::common::interfaces::ILogger> logger,
+ shared_ptr<vshl::common::interfaces::IAFBApi> afbApi);
+
+ // Binding API reference
+ shared_ptr<vshl::common::interfaces::IAFBApi> mAfbApi;
+
+ // Create a message channel for the capability.
+ shared_ptr<vshl::capabilities::core::MessageChannel>
+ getMessageChannel(shared_ptr<common::interfaces::ICapability> capability);
+
+ // Map of capabilities to message channels.
+ unordered_map<string, shared_ptr<vshl::capabilities::core::MessageChannel>>
+ mMessageChannelsMap;
+
+ // Logger
+ shared_ptr<vshl::common::interfaces::ILogger> mLogger;
+};
+
+} // namespace capabilities
+} // namespace vshl
+
+#endif // VSHL_CAPABILITIES_CAPABILITYMESSAGINGSERVICE_H_