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Learn how to effectively manage multiple Elasticsearch connections as singleton instances in C# , enhancing your application architecture and performance.
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Managing Multiple Elasticsearch Connections as Singleton Objects in C#

If you are developing a C# application that integrates with Elasticsearch, you might face the challenge of managing multiple connections efficiently. Particularly, you might want to create singleton instances for different client configurations, all while maintaining a clean architecture that adheres to best practices. In this guide, we will explore a solution to manage multiple Elasticsearch connections within a singleton design pattern.

The Problem

Suppose you have two static readonly instances intended for use with different Elasticsearch clients:

AcqClient

NcClient

In your application, these clients need to be configured as singletons, but when doing this, you might encounter the issue where only the last instance is available to your controller, regardless of the intended selection. This situation can arise if you don't effectively differentiate between the clients when setting them up with dependency injection in C# .

The Solution

Step 1: Define a Delegate for Service Resolution

To manage multiple configurations effectively, we need to create a service resolver delegate. This allows us to dynamically select the intended client based on context.

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Create Elasticsearch Singleton Objects

Next, we'll instantiate the ElasticClient objects for our connections:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Register Clients Using the ServiceResolver

Now, we will register our clients based on the provided key:

[[See Video to Reveal this Text or Code Snippet]]

In this setup, when the service resolver is called with a key (either "A" or "N"), it will appropriately register the required Elastic client as a singleton.

Step 4: Implementing in the Controller

Now, we can inject the IElasticClient into our controllers by using the ServiceResolver delegate. Here's how to handle it in different controllers:

In One Controller

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In Another Controller

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Conclusion

By utilizing a service resolver to manage multiple connections in your C# application, you can effectively keep your code clean, organized, and scalable. This allows each controller to fetch the correct instance of IElasticClient, thereby addressing the issue of singleton instantiation correctly and ensuring that you use the right Elasticsearch connection seamlessly.

By following the steps outlined in this post, you can enhance your application architecture and ensure better performance through efficient Elasticsearch connection management.