SERVER-39037 Add decorable flag on ServiceContext which is used to determine whether a replica set node is running in standalone mode

1 files changed, 59 insertions, 0 deletions

diff --git a/src/mongo/db/repl_set_member_in_standalone_mode.cpp b/src/mongo/db/repl_set_member_in_standalone_mode.cpp
new file mode 100644
index 00000000000..4ea8bc6bc1e
--- /dev/null
+++ b/src/mongo/db/repl_set_member_in_standalone_mode.cpp
@@ -0,0 +1,59 @@
+/**
+ *    Copyright (C) 2019-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/repl_set_member_in_standalone_mode.h"
+#include "mongo/db/service_context.h"
+
+namespace mongo {
+namespace {
+
+// The boost::optional<bool> decoration will be initialized to boost::none.
+const auto& replSetMemberInStandaloneMode =
+    ServiceContext::declareDecoration<boost::optional<bool>>();
+
+}  // namespace
+
+bool getReplSetMemberInStandaloneMode(ServiceContext* serviceCtx) {
+    auto& replSetMemberInStandaloneModeBool = replSetMemberInStandaloneMode(serviceCtx);
+    invariant(replSetMemberInStandaloneModeBool);
+
+    return replSetMemberInStandaloneModeBool.get();
+}
+
+void setReplSetMemberInStandaloneMode(ServiceContext* serviceCtx,
+                                      bool isReplSetMemberInStandaloneMode) {
+    auto& replSetMemberInStandaloneModeBool = replSetMemberInStandaloneMode(serviceCtx);
+    invariant(!replSetMemberInStandaloneModeBool);
+
+    replSetMemberInStandaloneModeBool = isReplSetMemberInStandaloneMode;
+}
+
+}  // namespace mongo