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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/s/chunk_split_state_driver.h"
#include "mongo/util/assert_util.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
std::shared_ptr<ChunkSplitStateDriver> ChunkSplitStateDriver::tryInitiateSplit(
std::shared_ptr<ChunkWritesTracker> writesTracker) {
invariant(writesTracker);
bool acquiredSplitLock = writesTracker->acquireSplitLock();
return acquiredSplitLock
? std::shared_ptr<ChunkSplitStateDriver>(new ChunkSplitStateDriver(writesTracker))
: nullptr;
}
ChunkSplitStateDriver::ChunkSplitStateDriver(ChunkSplitStateDriver&& source) noexcept {
_writesTracker = source._writesTracker;
source._writesTracker.reset();
_stashedBytesWritten = source._stashedBytesWritten;
source._stashedBytesWritten = 0;
_splitState = source._splitState;
source._splitState = SplitState::kNotSplitting;
}
ChunkSplitStateDriver::~ChunkSplitStateDriver() {
if (_splitState != SplitState::kSplitCommitted) {
auto wt = _writesTracker.lock();
if (wt) {
wt->releaseSplitLock();
wt->addBytesWritten(_stashedBytesWritten);
}
}
}
void ChunkSplitStateDriver::prepareSplit() {
invariant(_splitState == SplitState::kSplitInProgress);
_splitState = SplitState::kSplitPrepared;
auto wt = _writesTracker.lock();
uassert(50873, "Split interrupted due to chunk metadata change.", wt);
// Clear bytes written and get the previous bytes written.
_stashedBytesWritten = wt->clearBytesWritten();
}
void ChunkSplitStateDriver::abandonPrepare() {
_stashedBytesWritten = 0;
}
void ChunkSplitStateDriver::commitSplit() {
invariant(_splitState == SplitState::kSplitPrepared);
_splitState = SplitState::kSplitCommitted;
}
} // namespace mongo
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