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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/db/stats/fill_locker_info.h"
#include <algorithm>
#include "mongo/db/concurrency/locker.h"
#include "mongo/db/jsobj.h"
namespace mongo {
void fillLockerInfo(const Locker::LockerInfo& lockerInfo, BSONObjBuilder& infoBuilder) {
// "locks" section
BSONObjBuilder locks(infoBuilder.subobjStart("locks"));
const size_t locksSize = lockerInfo.locks.size();
// Only add the last lock of each type, and use the largest mode encountered. Each type of
// global resource is reported as its own type.
LockMode modeForType[static_cast<uint8_t>(ResourceGlobalId::kNumIds) + ResourceTypesCount - 1] =
{}; // default initialize to zero (min value)
for (size_t i = 0; i < locksSize; i++) {
const Locker::OneLock& lock = lockerInfo.locks[i];
const ResourceType lockType = lock.resourceId.getType();
auto index = lockType == RESOURCE_GLOBAL
? lock.resourceId.getHashId()
: static_cast<uint8_t>(ResourceGlobalId::kNumIds) + lockType - 1;
const LockMode lockMode = std::max(lock.mode, modeForType[index]);
// Check that lockerInfo is sorted on resource type
invariant(i == 0 || lockType >= lockerInfo.locks[i - 1].resourceId.getType());
if (lock.resourceId == resourceIdLocalDB) {
locks.append("local", legacyModeName(lock.mode));
continue;
}
modeForType[index] = lockMode;
if (i + 1 < locksSize && lockerInfo.locks[i + 1].resourceId.getType() == lockType &&
(lockType != RESOURCE_GLOBAL ||
lock.resourceId.getHashId() == lockerInfo.locks[i + 1].resourceId.getHashId())) {
continue; // skip this lock as it is not the last one of its type
} else if (lockType == RESOURCE_GLOBAL) {
locks.append(
resourceGlobalIdName(static_cast<ResourceGlobalId>(lock.resourceId.getHashId())),
legacyModeName(lockMode));
} else {
locks.append(resourceTypeName(lockType), legacyModeName(lockMode));
}
}
locks.done();
// "waitingForLock" section
infoBuilder.append("waitingForLock", lockerInfo.waitingResource.isValid());
// "lockStats" section
{
BSONObjBuilder lockStats(infoBuilder.subobjStart("lockStats"));
lockerInfo.stats.report(&lockStats);
lockStats.done();
}
}
} // namespace mongo
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