Implement client singleton
Each instance of the CosmosClient class has a few features that are already implemented on your behalf:
- Instances are already thread-safe
- Instances efficiently manage connections
- Instances cache addresses when operating in direct mode
Because of this behavior, each time you destroy and recreate and instance within a single .NET AppDomain, the new instances lose the benefits of the caching and connection management.
The Azure Cosmos DB for NoSQL SDK team recommends that you use a single instance per AppDomain for the lifetime of the application. This small change to your setup allows for better SDK client-side performance and more efficient connection management.
Tip
It's simple to use a singleton in a typical .NET console application. For ASP.NET web applications, you should review how to create a singleton instance using the dependency injection framework of your choice.