在MongoDB中使用悲觀鎖

jieforest發表於2012-10-25
MongoDB
In this article, I’m going to sketch a pattern for implementing pessimistic locking with MongoDB. MongoDB is a document-orientated NoSQL datastore that does not support locking itself.

In some business processes it may be required that you have an exclusive access to a single document. That’s when you need something like pessimistic locking.

Requirements

 The implementation should offer the following features:

Locking does not change the locked document itself

Locks can be removed manually or by a timeout

For the rest of this article, let’s assume we want to lock documents in a collection called workitem.

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