SERVER-53905 Implement PrimaryOnlyService for DDL coordinators

1 files changed, 65 insertions, 0 deletions

diff --git a/src/mongo/db/s/sharding_ddl_coordinator_service.h b/src/mongo/db/s/sharding_ddl_coordinator_service.h
new file mode 100644
index 00000000000..c514ca659c9
--- /dev/null
+++ b/src/mongo/db/s/sharding_ddl_coordinator_service.h
@@ -0,0 +1,65 @@
+/**
+ *    Copyright (C) 2021-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.
+ */
+
+#pragma once
+
+#include "mongo/db/namespace_string.h"
+#include "mongo/db/repl/primary_only_service.h"
+
+namespace mongo {
+
+class ShardingDDLCoordinatorService final : public repl::PrimaryOnlyService {
+public:
+    static constexpr StringData kServiceName = "ShardingDDLCoordinator"_sd;
+
+    explicit ShardingDDLCoordinatorService(ServiceContext* serviceContext)
+        : PrimaryOnlyService(serviceContext) {}
+
+    ~ShardingDDLCoordinatorService() = default;
+
+    static ShardingDDLCoordinatorService* getService(OperationContext* opCtx);
+
+    StringData getServiceName() const override {
+        return kServiceName;
+    }
+
+    NamespaceString getStateDocumentsNS() const override {
+        return NamespaceString::kShardingDDLCoordinatorsNamespace;
+    }
+
+    ThreadPool::Limits getThreadPoolLimits() const override {
+        return ThreadPool::Limits();
+    }
+
+    std::shared_ptr<Instance> constructInstance(BSONObj initialState) const override;
+
+    std::shared_ptr<Instance> getOrCreateInstance(OperationContext* opCtx, BSONObj initialState);
+};
+
+}  // namespace mongo