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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/storage/kv/kv_prefix.h"
namespace mongo {
int64_t KVPrefix::_nextValue = 0;
stdx::mutex KVPrefix::_nextValueMutex;
const KVPrefix KVPrefix::kNotPrefixed = KVPrefix(-1);
std::string KVPrefix::toString() const {
StackStringBuilder ss;
ss << "KVPrefix(" << _value << ")";
return ss.str();
}
/* static */ KVPrefix KVPrefix::fromBSONElement(const BSONElement value) {
if (value.eoo()) {
return kNotPrefixed;
}
return KVPrefix(static_cast<int64_t>(value.Long()));
}
/* static */ void KVPrefix::setLargestPrefix(KVPrefix largestPrefix) {
if (!storageGlobalParams.groupCollections) {
return;
}
stdx::lock_guard<stdx::mutex> lk(_nextValueMutex);
_nextValue = largestPrefix._value + 1;
}
/* static */ KVPrefix KVPrefix::getNextPrefix(const NamespaceString& ns) {
if (!storageGlobalParams.groupCollections || ns.isOplog()) {
return kNotPrefixed;
}
return generateNextPrefix();
}
/* static */ KVPrefix KVPrefix::generateNextPrefix() {
stdx::lock_guard<stdx::mutex> lk(_nextValueMutex);
return KVPrefix(_nextValue++);
}
}
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