/// <summary>
/// Checks the current <see cref="HttpClient"/> and replaces it if headers or <see cref="Handler"/> has been modified
/// </summary>
protected (HttpClient Client, IDisposable Lock) GetClient()
{
// return current client if there are no changes
var resetLevel = Interlocked.Exchange(ref _clientAdjustmentRequestSignal, 0);
if (resetLevel > 0)
{
// block all reads and let all current requests finish
using (_lock.WriterLock())
{
// only reset the client if the handler has changed (signal = 2)
var resetClient = resetLevel == 2;
if (resetClient)
{
var handler = CreateHandler();
Client?.Dispose();
Client = handler != null ? new HttpClient(handler, true) : new HttpClient();
}
// apply new headers
Headers.ApplyTo(Client);
// allow the consumer to change the client
SetupClient(Client, resetClient);
// reset the state
Interlocked.Exchange(ref _clientAdjustmentRequestSignal, 0);
}
}
return(Client, _lock.ReaderLock());
}