86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
/*
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Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef COMPRESSION_LZ4_WRITER_INCLUDED
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#define COMPRESSION_LZ4_WRITER_INCLUDED
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#include <lz4frame.h>
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#include <string.h>
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#include <functional>
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#include <mutex>
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#include "client/dump/abstract_output_writer_wrapper.h"
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#include "client/dump/i_output_writer.h"
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#include "my_inttypes.h"
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namespace Mysql {
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namespace Tools {
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namespace Dump {
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/**
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Wrapper to another Output Writer, compresses formatted data stream with LZ4.
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*/
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class Compression_lz4_writer : public I_output_writer,
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public Abstract_output_writer_wrapper {
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public:
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Compression_lz4_writer(
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std::function<bool(const Mysql::Tools::Base::Message_data &)>
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*message_handler,
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Simple_id_generator *object_id_generator);
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~Compression_lz4_writer();
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bool init();
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void append(const std::string &data_to_append);
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// Fix "inherits ... via dominance" warnings
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void register_progress_watcher(I_progress_watcher *new_progress_watcher) {
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Abstract_chain_element::register_progress_watcher(new_progress_watcher);
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}
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// Fix "inherits ... via dominance" warnings
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uint64 get_id() const { return Abstract_chain_element::get_id(); }
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protected:
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// Fix "inherits ... via dominance" warnings
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void item_completion_in_child_callback(Item_processing_data *item_processed) {
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Abstract_chain_element::item_completion_in_child_callback(item_processed);
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}
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private:
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void process_buffer(size_t lz4_result);
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void prepare_buffer(size_t src_size);
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std::mutex m_lz4_mutex;
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LZ4F_compressionContext_t m_compression_context;
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std::vector<char> m_buffer;
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};
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} // namespace Dump
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} // namespace Tools
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} // namespace Mysql
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#endif
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