From 3542b3a9338a286a18f732f3691665305c525625 Mon Sep 17 00:00:00 2001
From: Lunny Xiao <xiaolunwen@gmail.com>
Date: Sun, 16 Sep 2018 14:56:03 +0800
Subject: [PATCH] context

---
 session.go         |  4 +++-
 session_context.go | 32 ++++++++++++++++++++++++++++++++
 session_get.go     | 16 +++++++++++++++-
 3 files changed, 50 insertions(+), 2 deletions(-)
 create mode 100644 session_context.go

diff --git a/session.go b/session.go
index 3775eb01..966cd2ce 100644
--- a/session.go
+++ b/session.go
@@ -5,6 +5,7 @@
 package xorm
 
 import (
+	"context"
 	"database/sql"
 	"encoding/json"
 	"errors"
@@ -51,7 +52,8 @@ type Session struct {
 	lastSQL     string
 	lastSQLArgs []interface{}
 
-	err error
+	err     error
+	context context.Context
 }
 
 // Clone copy all the session's content and return a new session
diff --git a/session_context.go b/session_context.go
new file mode 100644
index 00000000..510c8b48
--- /dev/null
+++ b/session_context.go
@@ -0,0 +1,32 @@
+// Copyright 2018 The Xorm 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 xorm
+
+import (
+	"context"
+)
+
+type cacheContext struct {
+	context.Context
+	values map[string]interface{}
+}
+
+func (c *cacheContext) Done() <-chan struct{} {
+	for k := range c.values {
+		delete(c.values, k)
+	}
+	return nil
+}
+
+func (c *cacheContext) Value(key interface{}) interface{} {
+	return c.values[key.(string)]
+}
+
+func WithCacher(ctx context.Context) context.Context {
+	return &cacheContext{
+		Context: ctx,
+		values:  make(map[string]interface{}),
+	}
+}
diff --git a/session_get.go b/session_get.go
index 69194a23..2808a2c4 100644
--- a/session_get.go
+++ b/session_get.go
@@ -66,7 +66,21 @@ func (session *Session) get(bean interface{}) (bool, error) {
 		}
 	}
 
-	return session.nocacheGet(beanValue.Elem().Kind(), table, bean, sqlStr, args...)
+	if session.context != nil {
+		//res := session.context.Value(fmt.Sprintf("%v-%v", sql, args))
+		//runtime.deepcopy()
+		//&res
+	}
+
+	has, err := session.nocacheGet(beanValue.Elem().Kind(), table, bean, sqlStr, args...)
+	if err != nil || !has {
+		return has, err
+	}
+	if session.context != nil {
+		//session.context.
+	}
+
+	return true, nil
 }
 
 func (session *Session) nocacheGet(beanKind reflect.Kind, table *core.Table, bean interface{}, sqlStr string, args ...interface{}) (bool, error) {