131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
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*
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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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*
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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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*
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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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*
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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 PLUGIN_X_PROTOCOL_ENCODERS_ENCODING_POOL_H_
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#define PLUGIN_X_PROTOCOL_ENCODERS_ENCODING_POOL_H_
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#include <cassert>
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#include <cstdint>
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#include <vector>
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#include "plugin/x/ngs/include/ngs/protocol/page_pool.h"
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namespace protocol {
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class Page {
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public:
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template <int size>
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explicit Page(uint8_t (&data_arr)[size]) {
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m_begin_data = m_current_data = reinterpret_cast<uint8_t *>(&data_arr);
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m_end_data = m_begin_data + size;
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}
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Page(const uint32_t size, char *data_ptr) {
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m_begin_data = m_current_data = reinterpret_cast<uint8_t *>(data_ptr);
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m_end_data = m_begin_data + size;
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}
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virtual ~Page() = default;
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void reset() {
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m_current_data = m_begin_data;
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m_next_page = nullptr;
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}
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bool is_at_least(const uint32_t needed_size) const {
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return m_end_data > m_current_data + needed_size;
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}
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bool is_full() const { return m_end_data <= m_current_data; }
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bool is_empty() const { return m_begin_data == m_current_data; }
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uint32_t get_used_bytes() const { return m_current_data - m_begin_data; }
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uint32_t get_free_bytes() const { return m_end_data - m_current_data; }
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uint8_t *get_free_ptr() const { return m_current_data; }
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uint8_t *m_begin_data;
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uint8_t *m_current_data;
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uint8_t *m_end_data;
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uint32_t m_references = 0;
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Page *m_next_page = nullptr;
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};
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class Encoding_pool {
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public:
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using Pool = ngs::Page_pool<Page>;
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public:
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explicit Encoding_pool(const uint32_t local_cache,
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ngs::Memory_block_pool *memory_pool)
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: m_local_cache(local_cache), m_pool(memory_pool) {}
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~Encoding_pool() {
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while (m_empty_pages) {
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auto page = m_empty_pages;
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m_empty_pages = m_empty_pages->m_next_page;
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--m_pages;
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m_pool.deallocate(page);
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}
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DBUG_ASSERT(0 == m_pages);
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}
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Page *alloc_page() {
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if (m_empty_pages) {
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auto result = m_empty_pages;
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m_empty_pages = m_empty_pages->m_next_page;
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result->reset();
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return result;
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}
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++m_pages;
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return m_pool.allocate();
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}
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void release_page(Page *page) {
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if (m_pages < m_local_cache) {
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page->m_next_page = m_empty_pages;
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m_empty_pages = page;
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return;
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}
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--m_pages;
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m_pool.deallocate(page);
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}
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const Pool *get_pool() const { return &m_pool; }
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private:
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Page *m_empty_pages = nullptr;
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uint32_t m_local_cache = 0;
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uint32_t m_pages = 0;
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Pool m_pool;
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};
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} // namespace protocol
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#endif // PLUGIN_X_PROTOCOL_ENCODERS_ENCODING_POOL_H_
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