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/*
* Copyright (c) 2018, 2025, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2.0,
* as published by the Free Software Foundation.
*
* This program is designed to work with certain software (including
* but not limited to OpenSSL) that is licensed under separate terms,
* as designated in a particular file or component or in included license
* documentation. The authors of MySQL hereby grant you an additional
* permission to link the program and your derivative works with the
* separately licensed software that they have either included with
* the program or referenced in the documentation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License, version 2.0, for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef PLUGIN_X_PROTOCOL_ENCODERS_ENCODING_POOL_H_
#define PLUGIN_X_PROTOCOL_ENCODERS_ENCODING_POOL_H_
#include <cassert>
#include <cstdint>
#include <vector>
#include "plugin/x/src/ngs/protocol/page_pool.h"
namespace protocol {
class Page {
public:
template <int size>
explicit Page(uint8_t (&data_arr)[size]) {
m_begin_data = m_current_data = reinterpret_cast<uint8_t *>(&data_arr);
m_end_data = m_begin_data + size;
}
Page(const uint32_t size, char *data_ptr) {
m_begin_data = m_current_data = reinterpret_cast<uint8_t *>(data_ptr);
m_end_data = m_begin_data + size;
}
virtual ~Page() = default;
void reset() {
m_current_data = m_begin_data;
m_next_page = nullptr;
}
bool is_at_least(const uint32_t needed_size) const {
return m_end_data > m_current_data + needed_size;
}
bool is_full() const { return m_end_data <= m_current_data; }
bool is_empty() const { return m_begin_data == m_current_data; }
uint32_t get_used_bytes() const { return m_current_data - m_begin_data; }
uint32_t get_free_bytes() const { return m_end_data - m_current_data; }
uint8_t *get_free_ptr() const { return m_current_data; }
uint8_t *m_begin_data;
uint8_t *m_current_data;
uint8_t *m_end_data;
uint32_t m_references = 0;
Page *m_next_page = nullptr;
};
class Encoding_pool {
public:
using Pool = ngs::Page_pool<Page>;
public:
explicit Encoding_pool(const uint32_t local_cache,
ngs::Memory_block_pool *memory_pool)
: m_local_cache(local_cache), m_pool(memory_pool) {}
~Encoding_pool() {
while (m_empty_pages) {
auto page = m_empty_pages;
m_empty_pages = m_empty_pages->m_next_page;
--m_pages;
m_pool.deallocate(page);
}
assert(0 == m_pages);
}
Page *alloc_page() {
if (m_empty_pages) {
auto result = m_empty_pages;
m_empty_pages = m_empty_pages->m_next_page;
result->reset();
return result;
}
++m_pages;
return m_pool.allocate();
}
void release_page(Page *page) {
if (m_pages < m_local_cache) {
page->m_next_page = m_empty_pages;
m_empty_pages = page;
return;
}
--m_pages;
m_pool.deallocate(page);
}
const Pool *get_pool() const { return &m_pool; }
private:
Page *m_empty_pages = nullptr;
uint32_t m_local_cache = 0;
uint32_t m_pages = 0;
Pool m_pool;
};
} // namespace protocol
#endif // PLUGIN_X_PROTOCOL_ENCODERS_ENCODING_POOL_H_
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