纪元模式与序列化之间的差异 [英] Difference between Memento Pattern and Serialization

问题描述

我正在做一些关于Memento模式的研究，而且我通常对行为模式很新，而且我的研究一直在变得很困惑。我一直困惑的主要事情之一是Memento Pattern和序列化之间的区别。

从我可以收集的两者都可以用来存储对象，并有他们以后再带回来，但是我还没有找到一个明确的答案，他们之间的关键区别是什么，也许我错过了我的研究中的一些东西，但我想知道是否有人可以揭示什么差异在这两个之间。

谢谢

解决方案

用于实现回滚/保存点支持。例如，我可能想要在某个时间点标记一个对象的状态，做一些工作，然后决定将该对象还原到标记的位置。

实现一个Memento模式可以使用序列化，这将包括将对象的内容保存为一个字节[]并保留在内存中或写入磁盘。当返回对象的内容将从序列化的副本重建时。

相反，我可以通过在内存中克隆对象并保留对副本的引用来实现Memento模式然后如果对象需要还原，则将状态复制回来。此方法不使用序列化。

I am doing some research into the Memento Pattern and I am generally new to behavioural patterns and with my research I have been getting pretty confused. One of the main things I have been getting confused on is the differences between the Memento Pattern and Serialization.

From what I can gather both can be used to store objects and have them brought back at a later date but I have not been able to find a clear cut answer on what the key differences between them are, maybe I have missed something in my research but I was wondering if anyone could shed some light on what the differences are between the two.

Thanks

解决方案

Typically the Memento pattern is used to implement roll-back/save point support. For example I might want to mark the state of an object at a point in time, do some work and then decide to revert that object back to the point at which is was marked.

The implementation of a Memento pattern could use serialisation, which would involve saving the contents of the object into a byte[] and keeping in memory or writing to disk. When reverting the content of the object would be rebuilt from the serialised copy.

Conversely I could implement a Memento pattern by cloning the object in memory and keeping a reference to the copy and then copying the state back if the object needs reverting. This method doesn't use serialisation.

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