/// <summary>
/// Subscribes to the provided selector.
/// </summary>
/// <param name="selector">The subscription selector.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns></returns>
private async Task SubscribeNoConnectAsync(EventSelector selector, CancellationToken cancellationToken = default(CancellationToken))
{
// throw if cancelled
cancellationToken.ThrowIfCancellationRequested();
// serialize
string requestMsg = JsonConvert.SerializeObject(new Message()
{
Payload = new SubscribeMessage()
{
Selector = selector.ToString()
},
Type = "Subscribe",
MessageID = Guid.NewGuid()
});
// wait for subscription semaphore
await _subscriptionSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
try {
// wait for send semaphore
await _sendSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
try {
// send to opposing client
await _client.SendAsync(new ArraySegment <byte>(Encoding.UTF8.GetBytes(requestMsg)), WebSocketMessageType.Text, true, cancellationToken)
.ConfigureAwait(false);
// add to subscriptions
lock (_subscriptionList)
_subscriptionList.Add(selector.ToString());
} finally {
_sendSemaphore.Release();
}
} finally {
_subscriptionSemaphore.Release();
}
}
