private void SendSubscribe(Connection conn, Subscription sub)
{
string queue = sub.Options.Queue;
conn.Send("SUB " + sub.Topic + " " + queue + " " + sub.Id);
}
/// <summary>
/// Subscribe the specified topic and invokes messageHandler when message arrives.
/// </summary>
/// <param name='topic'>
/// Topic.
/// </param>
/// <param name="options">
/// Options.
/// Current avialble options: queue
/// </param>
/// <param name='messageHandler'>
/// Message handler.
/// Three arguments are: subscriptionId, message, replyTopic
/// replyTopic can be null if no reply is expected
/// </param>
/// <returns>
/// Subscription Id
/// </returns>
/// <remarks>
/// messageHandler may be invoked before this function returns as this is a multi-threading library
/// </remarks>
///
public int Subscribe(string topic, Options options, Action<int, string, string> messageHandler)
{
ThrowIfDisposed();
var sub = new Subscription(Interlocked.Increment(ref _sidBase), topic, options, messageHandler);
lock (_stateLock)
{
_subscriptions.Add(sub.Id, sub);
if (_connection != null)
{
SendSubscribe(_connection, sub);
}
}
return sub.Id;
}