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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/op_observer.h"
#include "mongo/db/operation_context.h"
namespace mongo {
namespace {
const auto getOpObserverTimes = OperationContext::declareDecoration<OpObserver::Times>();
} // namespace
auto OpObserver::Times::get(OperationContext* const opCtx) -> Times& {
return getOpObserverTimes(opCtx);
}
OpObserver::ReservedTimes::ReservedTimes(OperationContext* const opCtx)
: _times(Times::get(opCtx)) {
// Every time that a `ReservedTimes` scope object is instantiated, we have to track if there was
// a potentially recursive call. When there was no `OpObserver` chain being executed before this
// instantiation, we should have an empty `reservedOpTimes` vector.
if (!_times._recursionDepth++) {
invariant(_times.reservedOpTimes.empty());
}
invariant(_times._recursionDepth > 0);
invariant(_times._recursionDepth == 1 || !opCtx->writesAreReplicated());
}
OpObserver::ReservedTimes::~ReservedTimes() {
// Every time the `ReservedTimes` guard goes out of scope, this indicates one fewer level of
// recursion in the `OpObserver` registered chain.
if (!--_times._recursionDepth) {
// When the depth hits 0, the `OpObserver` is considered to have finished, and therefore the
// `reservedOpTimes` state needs to be reset.
_times.reservedOpTimes.clear();
}
invariant(_times._recursionDepth >= 0);
}
} // namespace mongo
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