1 files changed, 12 insertions, 0 deletions
diff --git a/src/mongo/client/dbclientinterface.h b/src/mongo/client/dbclientinterface.h
index 95d7e1c6a23..37ad9533078 100644
--- a/src/mongo/client/dbclientinterface.h
+++ b/src/mongo/client/dbclientinterface.h
@@ -324,6 +324,10 @@ namespace mongo {
     */
     class Query {
     public:
+        static const BSONField<BSONObj> ReadPrefField;
+        static const BSONField<std::string> ReadPrefModeField;
+        static const BSONField<BSONArray> ReadPrefTagsField;
+
         BSONObj obj;
         Query() : obj(BSONObj()) { }
         Query(const BSONObj& b) : obj(b) { }
@@ -399,6 +403,14 @@ namespace mongo {
         Query& where(const string &jscode) { return where(jscode, BSONObj()); }
 
         /**
+         * Sets the read preference for this query.
+         *
+         * @param pref the read preference mode for this query.
+         * @param tags the set of tags to use for this query.
+         */
+        Query& readPref(ReadPreference pref, const BSONArray& tags);
+
+        /**
          * @return true if this query has an orderby, hint, or some other field
          */
         bool isComplex( bool * hasDollar = 0 ) const;