MongoDB connection methods c#

Question

I am using MongoDB in my ASP.NET C# Web API. When I reference MongoDB docs I found out that the connections are opened and closed automatically.

A MongoClient object will be the root object. It is thread-safe and is all that is needed to handle connecting to servers, monitoring servers, and performing operations against those servers. [...] It is recommended to store a MongoClient instance in a global place, either as a static variable or in an IoC container with a singleton lifetime. However, multiple MongoClient instances created with the same settings will utilize the same connection pools underneath.

I couldn't really understand what it meant by storing instance or in IOC container with singleton lifetime.

Can I get any reference explaining how to do that ? Is It bad to just use new MongoClient() directly on my CRUD operations. Do I have to really manage these connections? And do I have to handle something in code to achieve thread safety in MongoDB?

I am asking this because my write and delete operation is getting executed in the wrong order on multithreads.

If you need more code please feel free to ask.

dododo · Accepted Answer · 2021-09-26 23:45:14Z

1

Is It bad to just use new MongoClient()

no, there is nothing wrong in this approach, but it's no longer considered as preferable. In fact when you create a MongoClient, the internal client's logic checks whether you already created a MongoClient with the same MongoClientSettings before and if so, then you will just reuse the previously created client. So effectively this logic is singleton, but it's implemented on the mongoClient side. However there are some down sides with this approach, look at this doc for details.

Do I have to really manage these connections?

no, this is MongoClient responsibility.

And do I have to handle something in code to achieve thread safety in MongoDB?

no, you don't need to do anything, however, even though some underlying functionality in MongoClient is thread safe, not all functionality provided by MongoClient is thread safe, for example sessions are not thread safe.

edited Sep 26, 2021 at 23:45

answered Sep 26, 2021 at 20:30

dododo

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2 Comments

Aneesh Over a year ago

Thanks for the Info @dododo. One More Doubt. Can I set Connection Limit to one for the MongoClient through MongoClientSettings ? what's the setting used ?

dododo Over a year ago

as soon as you have a different MongoClientSettings (Connection Limit to one for the MongoClien), then you will recreate the whole MongoClient machinery like connection pool, internal threads and etc (means you won't reuse the previously create clients) which is possible but not recommended. what's the setting used - it's used to limit a number of server connections that can be created. As soon as this limit is reached, the new connections won't be created and instead, the driver will wait until the previously created connections will be released

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