OpenWeatherMap.Cache 1.3.3

OpenWeatherMap.Cache

An asynchronous .NET Standard library that allows you to fetch & cache current weather readings from the OpenWeatherMap API, with in-built resiliency that can extend the cache lifetime in case the API is unreachable.

Installation

The recommended means is to use NuGet, but you could also download the source code from here.

Choose the fetch mode

If the time elapsed since the last fetch for the given location exceeds the cache period but is within the resiliency period (i.e. still available in the cache), the API reported measured time in the cache value is sometimes more recent than the latest value fetched from the API.

With FetchMode.AlwaysUseLastMeasured, the value still available in the cache is returned. IMPORTANT: Frequent calls may impact your API usage.

With FetchMode.AlwaysUseLastMeasuredButExtendCache (default), the value still available in the cache is returned but in order to protect impact on your API usage, this setting updates the cache value's fetched date and extends the cache lifetime.

With FetchMode.AlwaysUseLastFetchedValue, the last fetched API result is returned anyway, even though it is being reported to be older by the API.

Initialization with Dependency Injection

In your Startup.cs (ConfigureServices):

services.AddOpenWeatherMapCache("[API KEY]", FetchMode.AlwaysUseLastMeasuredButExtendCache, 9_500, 300_000);

Then you can inject IOpenWeatherMapCache.

Initialization without Dependency Injection

Create your own instance:

var openWeatherMapCache = new OpenWeatherMapCache("[API KEY]", FetchMode.AlwaysUseLastMeasuredButExtendCache, 9_500, 300_000);

Usage in asynchronous methods (recommended)

var location = new OpenWeatherMap.Cache.Location(47.6371, -122.1237);
var readings = await openWeatherMapCache.GetReadingsAsync(location);
if (readings.IsSuccessful)
{
	...
}
else
{
	var apiErrorCode = readings.Exception?.ApiErrorCode;
	var apiErrorMessage = readings.Exception?.ApiErrorMessage;
}

Usage in synchronous methods

var location = new OpenWeatherMap.Cache.Location(47.6371, -122.1237);
var readings = openWeatherMapCache.GetReadingsAsync(location).Result;
if (readings.IsSuccessful)
{
	...
}
else
{
	var apiErrorCode = readings.Exception?.ApiErrorCode;
	var apiErrorMessage = readings.Exception?.ApiErrorMessage;
}