SERVER-18035 cleaned up syncRollback. added unit test rs_rollback_test.

1 files changed, 90 insertions, 0 deletions

diff --git a/src/mongo/db/repl/rollback_source.h b/src/mongo/db/repl/rollback_source.h
new file mode 100644
index 00000000000..304a81717dc
--- /dev/null
+++ b/src/mongo/db/repl/rollback_source.h
@@ -0,0 +1,90 @@
+/**
+ *    Copyright (C) 2015 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.
+ */
+
+#pragma once
+
+#include "mongo/base/disallow_copying.h"
+#include "mongo/base/status_with.h"
+#include "mongo/db/jsobj.h"
+
+namespace mongo {
+
+    class NamespaceString;
+    class OperationContext;
+
+namespace repl {
+
+    class OplogInterface;
+
+    /**
+     * Interface for rollback-related operations on the sync source.
+     */
+    class RollbackSource {
+        MONGO_DISALLOW_COPYING(RollbackSource);
+    public:
+
+        RollbackSource() = default;
+
+        virtual ~RollbackSource() = default;
+
+        /**
+         * Returns remote oplog interface.
+         * Read oplog entries with OplogInterface::makeIterator().
+         */
+        virtual const OplogInterface& getOplog() const = 0;
+
+        /**
+         * Returns rollback ID.
+         */
+        virtual int getRollbackId() const = 0;
+
+        /**
+         * Returns last operation in oplog.
+         */
+        virtual BSONObj getLastOperation() const = 0;
+
+        /**
+         * Fetch a single document from the sync source.
+         */
+        virtual BSONObj findOne(const NamespaceString& nss, const BSONObj& filter) const = 0;
+
+        /**
+         * Clones a single collection from the sync source.
+         */
+        virtual void copyCollectionFromRemote(OperationContext* txn,
+                                              const NamespaceString& nss) const = 0;
+
+        /**
+         * Returns collection info.
+         */
+        virtual StatusWith<BSONObj> getCollectionInfo(const NamespaceString& nss) const = 0;
+
+    };
+
+} // namespace repl
+} // namespace mongo