在ASP.NET缓存模式 [英] Caching Patterns in ASP.NET

问题描述

所以我只是固定在一个框架，我正在开发一个错误。伪伪code是这样的：

So I just fixed a bug in a framework I'm developing. The pseudo-pseudocode looks like this:

myoldObject = new MyObject { someValue = "old value" };
cache.Insert("myObjectKey", myoldObject);
myNewObject = cache.Get("myObjectKey");
myNewObject.someValue = "new value";
if(myObject.someValue != cache.Get("myObjectKey").someValue)
     myObject.SaveToDatabase();

所以，基本上，我是从缓存后的原始对象比较缓存的对象，以确定我需要将其保存到情况下，数据库它改变了得到一个对象，然后。这个问题的出现是因为原来的对象是一个参考...所以变化someValue中也改变了引用缓存的对象，所以它永远不会保存到数据库中。我通过克隆对象关闭的缓存版本，切断参考，让我来比较新的对象对缓存的1个固定的。

So, essentially, I was getting an object from the cache, and then later on comparing the original object to the cached object to see if I need to save it to the database in case it's changed. The problem arose because the original object is a reference...so changing someValue also changed the referenced cached object, so it'd never save back to the database. I fixed it by cloning the object off of the cached version, severing the reference and allowing me to compare the new object against the cached one.

我的问题是：有没有更好的办法做到这一点，一些模式，你可以推荐我不能是已做过的唯一的人？）

My question is: is there a better way to do this, some pattern, that you could recommend? I can't be the only person that's done this before :)

推荐答案

肮脏的跟踪处理这种正常的方式，我想。是这样的：

Dirty tracking is the normal way to handle this, I think. Something like:

class MyObject {
  public string SomeValue { 
     get { return _someValue; }
     set { 
       if (value != SomeValue) {
          IsDirty = true;
          _someValue = value;
       }
  }

  public bool IsDirty {
     get;
     private set;
  }

  void SaveToDatabase() {
     base.SaveToDatabase(); 
     IsDirty = false;
  }
}

myoldObject = new MyObject { someValue = "old value" };
cache.Insert("myObjectKey", myoldObject);
myNewObject = cache.Get("myObjectKey");
myNewObject.someValue = "new value";
if(myNewObject.IsDirty)
   myNewObject.SaveToDatabase();

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