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https://github.com/Telecominfraproject/wlan-cloud-lib-cppkafka.git
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81 lines
2.5 KiB
C++
81 lines
2.5 KiB
C++
/*
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* Copyright (c) 2017, Matias Fontanini
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef CPPKAFKA_MESSAGE_INTERNAL_H
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#define CPPKAFKA_MESSAGE_INTERNAL_H
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#include <memory>
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namespace cppkafka {
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class Message;
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struct Internal {
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virtual ~Internal() = default;
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};
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using InternalPtr = std::shared_ptr<Internal>;
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/**
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* \brief Private message data structure
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*/
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struct MessageInternal {
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MessageInternal(void* user_data, std::shared_ptr<Internal> internal);
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static std::unique_ptr<MessageInternal> load(Message& message);
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void* user_data_;
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InternalPtr internal_;
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};
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template <typename BuilderType>
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struct MessageInternalGuard {
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MessageInternalGuard(BuilderType& builder)
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: builder_(builder),
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user_data_(builder.user_data()) {
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if (builder_.internal()) {
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// Swap contents with user_data
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ptr_.reset(new MessageInternal(user_data_, builder_.internal()));
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builder_.user_data(ptr_.get()); //overwrite user data
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}
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}
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~MessageInternalGuard() {
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//Restore user data
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builder_.user_data(user_data_);
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}
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void release() {
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ptr_.release();
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}
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private:
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BuilderType& builder_;
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std::unique_ptr<MessageInternal> ptr_;
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void* user_data_;
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};
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}
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#endif //CPPKAFKA_MESSAGE_INTERNAL_H
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