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/*
* Copyright (C) 2018 Codership Oy <info@codership.com>
*
* This file is part of wsrep-lib.
*
* Wsrep-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* Wsrep-lib 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef WSREP_STREAMING_CONTEXT_HPP
#define WSREP_STREAMING_CONTEXT_HPP
#include "compiler.hpp"
#include "logger.hpp"
#include "seqno.hpp"
#include "transaction_id.hpp"
#include <vector>
namespace wsrep
{
class streaming_context
{
public:
enum fragment_unit
{
bytes,
row,
statement
};
streaming_context()
: fragments_certified_()
, fragments_()
, rollback_replicated_for_()
, fragment_unit_()
, fragment_size_()
, unit_counter_()
, log_position_()
{ }
/**
* Set streaming parameters.
*
* Calling this method has a side effect of resetting unit
* counter.
*
* @param fragment_unit Desired fragment unit.
* @param fragment_size Desired fragment size.
*/
void params(enum fragment_unit fragment_unit, size_t fragment_size)
{
if (fragment_size)
{
WSREP_LOG_DEBUG(wsrep::log::debug_log_level(),
wsrep::log::debug_level_streaming,
"Enabling streaming: "
<< fragment_unit << " " << fragment_size);
}
else
{
WSREP_LOG_DEBUG(wsrep::log::debug_log_level(),
wsrep::log::debug_level_streaming,
"Disabling streaming");
}
fragment_unit_ = fragment_unit;
fragment_size_ = fragment_size;
reset_unit_counter();
}
void enable(enum fragment_unit fragment_unit, size_t fragment_size)
{
WSREP_LOG_DEBUG(wsrep::log::debug_log_level(),
wsrep::log::debug_level_streaming,
"Enabling streaming: "
<< fragment_unit << " " << fragment_size);
assert(fragment_size > 0);
fragment_unit_ = fragment_unit;
fragment_size_ = fragment_size;
}
enum fragment_unit fragment_unit() const { return fragment_unit_; }
size_t fragment_size() const { return fragment_size_; }
void disable()
{
WSREP_LOG_DEBUG(wsrep::log::debug_log_level(),
wsrep::log::debug_level_streaming,
"Disabling streaming");
fragment_size_ = 0;
}
void certified()
{
++fragments_certified_;
}
size_t fragments_certified() const
{
return fragments_certified_;
}
void stored(wsrep::seqno seqno)
{
check_fragment_seqno(seqno);
fragments_.push_back(seqno);
}
size_t fragments_stored() const
{
return fragments_.size();
}
void applied(wsrep::seqno seqno)
{
check_fragment_seqno(seqno);
++fragments_certified_;
fragments_.push_back(seqno);
}
void rolled_back(wsrep::transaction_id id)
{
assert(rollback_replicated_for_ == wsrep::transaction_id::undefined());
rollback_replicated_for_ = id;
}
bool rolled_back() const
{
return (rollback_replicated_for_ !=
wsrep::transaction_id::undefined());
}
size_t unit_counter() const
{
return unit_counter_;
}
void set_unit_counter(size_t count)
{
unit_counter_ = count;
}
void increment_unit_counter(size_t inc)
{
unit_counter_ += inc;
}
void reset_unit_counter()
{
unit_counter_ = 0;
}
size_t log_position() const
{
return log_position_;
}
void set_log_position(size_t position)
{
log_position_ = position;
}
const std::vector<wsrep::seqno>& fragments() const
{
return fragments_;
}
bool fragment_size_exceeded() const
{
return unit_counter_ >= fragment_size_;
}
void cleanup()
{
fragments_certified_ = 0;
fragments_.clear();
rollback_replicated_for_ = wsrep::transaction_id::undefined();
unit_counter_ = 0;
log_position_ = 0;
}
private:
void check_fragment_seqno(wsrep::seqno seqno WSREP_UNUSED)
{
assert(seqno.is_undefined() == false);
assert(fragments_.empty() || fragments_.back() < seqno);
}
size_t fragments_certified_;
std::vector<wsrep::seqno> fragments_;
wsrep::transaction_id rollback_replicated_for_;
enum fragment_unit fragment_unit_;
size_t fragment_size_;
size_t unit_counter_;
size_t log_position_;
};
}
#endif // WSREP_STREAMING_CONTEXT_HPP
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