Change RawDatastore to do less reflection.

go/src/infra/gae/epservice/example/service_add.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package example
 
 import (
         "golang.org/x/net/context"
+
         "infra/gae/libs/gae"
+        "infra/gae/libs/gae/helper"
         "infra/gae/libs/gae/prod"
 
         "github.com/GoogleCloudPlatform/go-endpoints/endpoints"
 )
 
 // AddReq describes the input parameters to the 'Add' RPC. Name is required,
 // which makes it show up in the REST path, and Delta will be encoded in the
 // request body as JSON.
 type AddReq struct {
         Name string `endpoints:"required"`
@@ skipping 10 matching lines @@
 
 // Add adds a value to the current counter, and returns the old+new values. It
 // may cause a counter to come into existance.
 func (Example) Add(c context.Context, r *AddReq) (rsp *AddRsp, err error) {
         rsp = &AddRsp{}
 
         c = prod.Use(c)
         err = gae.GetRDS(c).RunInTransaction(func(c context.Context) error {
                 rds := gae.GetRDS(c)
                 ctr := &Counter{}
+                pls := helper.GetPLS(ctr)
                 key := rds.NewKey("Counter", r.Name, 0, nil)
-                if err := rds.Get(key, ctr); err != nil && err != gae.ErrDSNoSuchEntity {
+                if err := rds.Get(key, pls); err != nil && err != gae.ErrDSNoSuchEntity {
                         return err
                 }
                 rsp.Prev = ctr.Val
                 ctr.Val += r.Delta
                 rsp.Cur = ctr.Val
-                _, err := rds.Put(key, ctr)
+                _, err := rds.Put(key, pls)
                 return err
         }, nil)
         return
 }
 
 func init() {
         mi["Add"] = &endpoints.MethodInfo{
                 Path: "counter/{Name}",
                 Desc: "Add an an amount to a particular counter",
         }
 }