OpenWeather API Example usage using FusionCache and Redis

This is a simple example of how to use FusionCache in a .NET Core application to provide L1 and L2 caching.

It showcases selective cache invalidation using Tags.

We'll use this until Microsoft releases the official version of the HybridCache.

Microsoft.Extensions.Caching.HybridCache is currently in preview only, so may change.

How to use

• docker-compose up -d to start redis on port 6379
• dotnet run to start the application
• Try the http examples in Examples.http (or use Swagger UI)

Note

• Fusioncache allows you to use multiple cache providers, but in this example, we are using only MemoryCache and RedisCache.

• You can do tag based invalidation with FusionCache so you can invalidate ALL cache entries with that tag in one foul swoop.

• The tag is a string, so you can use it to group cache entries together.

• Invalidation via tags does not actually remove the cache entries from the cache, it just marks them as invalid.

• Sign up to OpenWeatherMap and get your API key to use the weather API. Update in appsettings.json.

{
 "Logging": {
   "LogLevel": {
     "Default": "Information",
     "Microsoft.AspNetCore": "Warning"
   }
 },
 "AllowedHosts": "*",
 "OpenWeather": {
   "ApiKey": "your-api-key-here"
 }
}

Changes

• Added FusionCache to the project.
• Added Configuration Options for Redis and OpenWeatherApi
• Added resiliency to the OpenWeather API calls using decorator pattern