SessionMessageDelegate.h

/*
 *    Copyright (c) 2021 Project CHIP Authors
 *
 *    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.
 */

#pragma once

#include <transport/Session.h>
#include <transport/raw/MessageHeader.h>

namespace chip {

/**
 * @brief
 *   This class provides a skeleton for the callback functions. The functions will be
 *   called by SecureSssionMgrBase object on specific events. If the user of SessionManager
 *   is interested in receiving these callbacks, they can specialize this class and handle
 *   each trigger in their implementation of this class.
 */
class DLL_EXPORT SessionMessageDelegate
{
public:
    virtual ~SessionMessageDelegate() {}

    enum class DuplicateMessage : uint8_t
    {
        Yes,
        No,
    };

    /**
     * @brief
     *   Called when a new message is received. The function must internally release the
     *   msgBuf after processing it.
     *
     * @param packetHeader  The message header
     * @param payloadHeader The payload header
     * @param session       The handle to the secure session
     * @param isDuplicate   The message is a duplicate of previously received message
     * @param msgBuf        The received message
     */
    virtual void OnMessageReceived(const PacketHeader & packetHeader, const PayloadHeader & payloadHeader,
                                   const SessionHandle & session, DuplicateMessage isDuplicate,
                                   System::PacketBufferHandle && msgBuf) = 0;
};

} // namespace chip