mirror of
https://github.com/codership/wsrep-lib.git
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965642eded
Add support for detaching XA transactions. This is useful for handling the case where the DBMS client has a transaction in prepared state and disconnects. Before disconnect, the DBMS calls the newly introduced client_state::xa_detach(), to cleanup the local transaction and convert it to a high priority transaction. The DBMS may later attempt to terminate the transaction through client_state::commit_by_xid() or client_state::rollback_by_xid(). Also in this patch: - Fix client_state::close() so that it does not rollback transactions in prepared state - Changed class wsrep::xid representation to hold enough information so that DBMS can convert to its native representation - Fix potential infinite loop in server_state::find_streaming_applier(wsrep:xid&) - Append SR keys on prepare fragment and make it pa_unsafe - Handle one phase commit (simply fall back to two phase) - Do not rollback prepared streaming clients in server_state::close_orphaned_transactions()
129 lines
3.4 KiB
C++
129 lines
3.4 KiB
C++
/*
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* Copyright (C) 2018-2019 Codership Oy <info@codership.com>
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*
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* This file is part of wsrep-lib.
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*
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* Wsrep-lib is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* Wsrep-lib 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 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 wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef WSREP_BUFFER_HPP
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#define WSREP_BUFFER_HPP
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#include <cstddef>
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#include <vector>
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namespace wsrep
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{
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class const_buffer
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{
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public:
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const_buffer()
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: ptr_()
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, size_()
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{ }
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const_buffer(const void* ptr, size_t size)
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: ptr_(ptr)
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, size_(size)
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{ }
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const_buffer(const const_buffer& b)
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: ptr_(b.ptr())
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, size_(b.size())
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{ }
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const void* ptr() const { return ptr_; }
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const char* data() const { return static_cast<const char*>(ptr_); }
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size_t size() const { return size_; }
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const_buffer& operator=(const const_buffer& b)
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{
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ptr_ = b.ptr();
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size_ = b.size();
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return *this;
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}
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private:
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const void* ptr_;
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size_t size_;
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};
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class mutable_buffer
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{
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public:
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mutable_buffer()
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: buffer_()
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{ }
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mutable_buffer(const mutable_buffer& b)
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: buffer_(b.buffer_)
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{ }
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void resize(size_t s) { buffer_.resize(s); }
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void clear()
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{
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// using swap to ensure deallocation
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std::vector<char>().swap(buffer_);
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}
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void push_back(const char* begin, const char* end)
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{
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buffer_.insert(buffer_.end(), begin, end);
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}
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template <class C> void push_back(const C& c)
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{
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std::copy(c.begin(), c.end(), std::back_inserter(buffer_));
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}
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size_t size() const { return buffer_.size(); }
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/**
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* Return pointer to underlying data array. The returned pointer
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* may or may not be null in case of empty buffer, it is up to
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* user to check the size of the array before dereferencing the
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* pointer.
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*
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* @return Pointer to underlying data array.
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*/
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char* data() { return buffer_.data(); }
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/**
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* Return const pointer to underlying data array. The returned pointer
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* may or may not be null in case of empty buffer, it is up to
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* user to check the size of the array before dereferencing the
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* pointer.
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*
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* @return Const pointer to underlying data array.
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*/
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const char* data() const { return buffer_.data(); }
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mutable_buffer& operator= (const mutable_buffer& other)
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{
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buffer_ = other.buffer_;
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return *this;
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}
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bool operator==(const mutable_buffer& other) const
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{
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return buffer_ == other.buffer_;
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}
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private:
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std::vector<char> buffer_;
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};
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}
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#endif // WSREP_BUFFER_HPP
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