SERVER-24631: Add TTL collection namespace cache

1 files changed, 63 insertions, 0 deletions

diff --git a/src/mongo/db/ttl_collection_cache.cpp b/src/mongo/db/ttl_collection_cache.cpp
new file mode 100644
index 00000000000..c97f249bb10
--- /dev/null
+++ b/src/mongo/db/ttl_collection_cache.cpp
@@ -0,0 +1,63 @@
+/**
+ * Copyright (C) 2016 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/ttl_collection_cache.h"
+
+#include <algorithm>
+
+#include "mongo/db/service_context.h"
+
+namespace mongo {
+
+namespace {
+const auto getTTLCollectionCache = ServiceContext::declareDecoration<TTLCollectionCache>();
+}
+
+TTLCollectionCache& TTLCollectionCache::get(ServiceContext* ctx) {
+    return getTTLCollectionCache(ctx);
+}
+
+void TTLCollectionCache::registerCollection(const NamespaceString& collectionNS) {
+    stdx::lock_guard<stdx::mutex> lock(_ttlCollectionsLock);
+    _ttlCollections.push_back(collectionNS.ns());
+}
+
+void TTLCollectionCache::unregisterCollection(const NamespaceString& collectionNS) {
+    stdx::lock_guard<stdx::mutex> lock(_ttlCollectionsLock);
+    auto collIter = std::find(_ttlCollections.begin(), _ttlCollections.end(), collectionNS.ns());
+    fassert(40220, collIter != _ttlCollections.end());
+    _ttlCollections.erase(collIter);
+}
+
+std::vector<std::string> TTLCollectionCache::getCollections() {
+    stdx::lock_guard<stdx::mutex> lock(_ttlCollectionsLock);
+    return _ttlCollections;
+}
+};  // namespace mongo