SERVER-37665 Get rid of the 'checkOutSession' parameter of OperationContextSession

This simplifies the behaviour of the class and moves all the check-out
decision taking to happen in the only consumer - the endpoint.

Also renames OperationContextSessionMongoD to MongoDOperationContextSession
in order to be in sync with the naming nomenclature of SessionCatalog and
MongoDSessionCatalog.

1 files changed, 28 insertions, 0 deletions

diff --git a/src/mongo/db/session_catalog_mongod.h b/src/mongo/db/session_catalog_mongod.h
index 4496c8b17f3..c71e0dce076 100644
--- a/src/mongo/db/session_catalog_mongod.h
+++ b/src/mongo/db/session_catalog_mongod.h
@@ -65,4 +65,32 @@ public:
                                    boost::optional<BSONObj> singleSessionDoc);
 };
 
+/**
+ * Scoped object, which checks out the session specified in the passed operation context and stores
+ * it for later access by the command. The session is installed at construction time and is removed
+ * at destruction.
+ */
+class MongoDOperationContextSession {
+public:
+    MongoDOperationContextSession(OperationContext* opCtx);
+
+private:
+    OperationContextSession _operationContextSession;
+};
+
+/**
+ * Similar to MongoDOperationContextSession, but marks the TransactionParticipant as valid without
+ * refreshing from disk and starts a new transaction unconditionally.
+ *
+ * NOTE: Only used by the replication oplog application logic on secondaries in order to replay
+ * prepared transactions.
+ */
+class MongoDOperationContextSessionWithoutRefresh {
+public:
+    MongoDOperationContextSessionWithoutRefresh(OperationContext* opCtx);
+
+private:
+    OperationContextSession _operationContextSession;
+};
+
 }  // namespace mongo