text: /**
   *    Copyright (C) 2018 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/storage/backup_cursor_hooks.h"
  
  #include "mongo/base/init.h"
  #include "mongo/db/service_context.h"
  
  namespace mongo {
  
  namespace {
  BackupCursorHooks::InitializerFunction initializer = [](StorageEngine* storageEngine) {
      return stdx::make_unique<BackupCursorHooks>();
  };
  
  struct BackupCursorHooksHolder {
      std::unique_ptr<BackupCursorHooks> ptr = std::make_unique<BackupCursorHooks>();
  };
  
  const auto getBackupCursorHooks = ServiceContext::declareDecoration<BackupCursorHooksHolder>();
  }  // namespace
  
  void BackupCursorHooks::registerInitializer(InitializerFunction func) {
      initializer = func;
  }
  
  void BackupCursorHooks::initialize(ServiceContext* service, StorageEngine* storageEngine) {
      getBackupCursorHooks(service).ptr = initializer(storageEngine);
  }
  
  BackupCursorHooks* BackupCursorHooks::get(ServiceContext* service) {
      return getBackupCursorHooks(service).ptr.get();
  }
  
  BackupCursorHooks::~BackupCursorHooks() {}
  
  bool BackupCursorHooks::enabled() const {
      return false;
  }
  
  /**
   * The following methods cannot be called when BackupCursorHooks is not enabled.
   */
  void BackupCursorHooks::fsyncLock(OperationContext* opCtx) {
      MONGO_UNREACHABLE;
  }
  
  void BackupCursorHooks::fsyncUnlock(OperationContext* opCtx) {
      MONGO_UNREACHABLE;
  }
  
  BackupCursorState BackupCursorHooks::openBackupCursor(OperationContext* opCtx) {
      MONGO_UNREACHABLE;
  }
  
  void BackupCursorHooks::closeBackupCursor(OperationContext* opCtx, std::uint64_t cursorId) {
      MONGO_UNREACHABLE;
  }
  }  // namespace mongo
  