SERVER-37443 Make catalog objects survive collection rename.

This change only applies to collection renames within the
same database. Rename across databases requires copying the
data, and the resulting collection will have a new UUID.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/mongo/db/catalog/database_impl.h b/src/mongo/db/catalog/database_impl.h
index 38213e06055..5a2e95070f7 100644
--- a/src/mongo/db/catalog/database_impl.h
+++ b/src/mongo/db/catalog/database_impl.h
@@ -50,7 +50,6 @@ namespace mongo {
 class Collection;
 class DatabaseCatalogEntry;
 class IndexCatalog;
-class NamespaceDetails;
 class OperationContext;
 class PseudoRandom;
 
@@ -202,6 +201,11 @@ public:
 
     Collection* getOrCreateCollection(OperationContext* opCtx, const NamespaceString& nss) final;
 
+    /**
+     * Renames the fully qualified namespace 'fromNS' to the fully qualified namespace 'toNS'.
+     * Illegal to call unless both 'fromNS' and 'toNS' are within this database. Returns an error if
+     * 'toNS' already exists or 'fromNS' does not exist.
+     */
     Status renameCollection(OperationContext* opCtx,
                             StringData fromNS,
                             StringData toNS,
@@ -272,6 +276,7 @@ private:
 
     class AddCollectionChange;
     class RemoveCollectionChange;
+    class RenameCollectionChange;
 
     const std::string _name;  // "dbname"
 
@@ -300,7 +305,6 @@ private:
     Database* _this;                       // Pointer to wrapper, for external caller compatibility.
 
     friend class Collection;
-    friend class NamespaceDetails;
     friend class IndexCatalog;
 };