public ActiveHandlerTrackingEntry(
int key,
LifetimeTrackingHttpMessageHandler handler,
TimeSpan lifetime)
{
Key = key;
Handler = handler;
Lifetime = lifetime;
_lock = new object();
}
private ActiveHandlerTrackingEntry CreateHandlerEntry(int key, RequestData requestData)
{
// Wrap the handler so we can ensure the inner handler outlives the outer handler.
var handler = new LifetimeTrackingHttpMessageHandler(_createHttpClientHandler(requestData));
// Note that we can't start the timer here. That would introduce a very very subtle race condition
// with very short expiry times. We need to wait until we've actually handed out the handler once
// to start the timer.
//
// Otherwise it would be possible that we start the timer here, immediately expire it (very short
// timer) and then dispose it without ever creating a client. That would be bad. It's unlikely
// this would happen, but we want to be sure.
return(new ActiveHandlerTrackingEntry(key, handler, requestData.DnsRefreshTimeout));
}