Document - Riemann-java-client internally caches DNS records

[shanielh]

I'm doing it for documentation, Since I got a problem with it and I managed to solve it.

The TcpTransport and UdpTransport internally cache the IP address of a DNS record, It can be explicitly disabled.

My problem was that sometimes the riemann server changed the internal IP, And I got to it using an internal DNS, After that the riemann changed the IP, The client never sent events to the server.

The problem was that internal caching, I managed to cancel that caching using a simple code (The example given is in scala, But I'm sure you can write it in Java)

private def disableDnsCache(transport: Transport): Unit = {
  getDnsOption(transport).foreach(_.set(false))
}

private def getDnsOption(transport: Transport): Traversable[AtomicBoolean] = {
  transport match {
    case udp: UdpTransport => Some(udp.cacheDns)
    case tcp: TcpTransport => Some(tcp.cacheDns)
    case async: AsynchronizeTransport => getDnsOption(async.transport)
  }
}