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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/platform/basic.h"
#include "mongo/db/s/namespace_metadata_change_notifications.h"
namespace mongo {
NamespaceMetadataChangeNotifications::NamespaceMetadataChangeNotifications() = default;
NamespaceMetadataChangeNotifications::~NamespaceMetadataChangeNotifications() {
stdx::lock_guard<stdx::mutex> lock(_mutex);
invariant(_notificationsList.empty());
}
NamespaceMetadataChangeNotifications::ScopedNotification
NamespaceMetadataChangeNotifications::createNotification(const NamespaceString& nss) {
auto notifToken = std::make_shared<NotificationToken>(nss);
stdx::lock_guard<stdx::mutex> lg(_mutex);
auto& notifList = _notificationsList[nss];
notifToken->itToErase = notifList.insert(notifList.end(), notifToken);
return {this, std::move(notifToken)};
}
void NamespaceMetadataChangeNotifications::notifyChange(const NamespaceString& nss) {
stdx::lock_guard<stdx::mutex> lock(_mutex);
auto mapIt = _notificationsList.find(nss);
if (mapIt == _notificationsList.end()) {
return;
}
for (auto& notifToken : mapIt->second) {
notifToken->notify.set();
notifToken->itToErase.reset();
}
_notificationsList.erase(mapIt);
}
void NamespaceMetadataChangeNotifications::_unregisterNotificationToken(
std::shared_ptr<NotificationToken> token) {
stdx::lock_guard<stdx::mutex> lg(_mutex);
if (!token->itToErase) {
return;
}
auto mapIt = _notificationsList.find(token->nss);
auto& notifList = mapIt->second;
notifList.erase(*token->itToErase);
if (notifList.empty()) {
_notificationsList.erase(mapIt);
}
}
} // namespace mongo
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