How Can AsyncLazy Ensure a Critical Async Method Executes Only Once?

Achieving Single-Use Async Initialization: A Superior Approach

A frequent programming challenge involves executing a critical asynchronous method only once. While SemaphoreSlim can achieve this, AsyncLazy offers a more elegant and concise solution.

Introducing AsyncLazy: A Streamlined Solution

AsyncLazy is essentially a modified Lazy<T> designed for asynchronous operations. It lazily initializes a value upon the first access, perfectly suited for managing one-time async initializations.

Implementation Details

Here's how to use AsyncLazy to ensure your async initialization runs only once:

<code class="language-csharp">private AsyncLazy<bool> asyncLazy = new AsyncLazy<bool>(async () =>
{
    await DoStuffOnlyOnceAsync();
    return true;
});</code>

This creates an AsyncLazy instance wrapping the asynchronous initialization logic within DoStuffOnlyOnceAsync. The result is a lazy task that executes only on the first access.

Usage Example

To trigger the initialization and await its completion, simply use GetAwaiter():

<code class="language-csharp">var isInitialized = await asyncLazy.GetAwaiter();</code>

This will initiate DoStuffOnlyOnceAsync (if it hasn't already run) and return a boolean indicating success.

Summary

AsyncLazy provides a clean and efficient method for ensuring a single execution of a crucial asynchronous method. By encapsulating the initialization within a lazy task, it simplifies the code and offers a user-friendly way to access the result.

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