SERVER-5905 Add operation latency histogram

1 files changed, 12 insertions, 0 deletions

diff --git a/src/mongo/db/commands.h b/src/mongo/db/commands.h
index 874f728ae21..139f344089e 100644
--- a/src/mongo/db/commands.h
+++ b/src/mongo/db/commands.h
@@ -78,6 +78,8 @@ protected:
 public:
     typedef StringMap<Command*> CommandMap;
 
+    enum class ReadWriteType { kCommand, kRead, kWrite };
+
     /**
      * Constructs a new command and causes it to be registered with the global commands list. It is
      * not safe to construct commands other than when the server is starting up.
@@ -268,6 +270,16 @@ public:
         return LogicalOp::opCommand;
     }
 
+    /**
+     * Returns whether this operation is a read, write, or command.
+     *
+     * Commands which implement database read or write logic should override this to return kRead
+     * or kWrite as appropriate.
+     */
+    virtual ReadWriteType getReadWriteType() const {
+        return ReadWriteType::kCommand;
+    }
+
 protected:
     /**
      * Appends to "*out" the privileges required to run this command on database "dbname" with