SERVER-10026 SERVER-10461 overhaul yielding, introduce findAll

1 files changed, 46 insertions, 0 deletions

diff --git a/src/mongo/db/query/internal_plans.h b/src/mongo/db/query/internal_plans.h
new file mode 100644
index 00000000000..65c7e8c1001
--- /dev/null
+++ b/src/mongo/db/query/internal_plans.h
@@ -0,0 +1,46 @@
+/**
+ *    Copyright (C) 2013 10gen 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/>.
+ */
+
+#include "mongo/db/exec/collection_scan.h"
+#include "mongo/db/query/eof_runner.h"
+#include "mongo/db/query/internal_runner.h"
+
+namespace mongo {
+
+    /**
+     * The internal planner is a one-stop shop for "off-the-shelf" plans.  Most internal procedures
+     * that do not require advanced queries could be served by plans already in here.
+     */
+    class InternalPlanner {
+    public:
+        /**
+         * A collection scan.  Caller owns pointer.
+         */
+        static Runner* findAll(const StringData& ns, const DiskLoc startLoc = DiskLoc()) {
+            NamespaceDetails* nsd = nsdetails(ns);
+            if (NULL == nsd) { return new EOFRunner(ns.toString()); }
+
+            CollectionScanParams params;
+            params.ns = ns.toString();
+            params.start = startLoc;
+            WorkingSet* ws = new WorkingSet();
+            CollectionScan* cs = new CollectionScan(params, ws, NULL);
+
+            return new InternalRunner(ns.toString(), cs, ws);
+        }
+    };
+
+}  // namespace mongo