/// <summary>
/// Called when the ZooKeeper connection state has changed.
/// </summary>
/// <param name="args">
/// The <see cref="Kafka.Client.ZooKeeperIntegration.Events.ZooKeeperStateChangedEventArgs" /> instance
/// containing the event data.
/// </param>
/// <remarks>
/// Do nothing, since zkclient will do reconnect for us.
/// </remarks>
public void HandleStateChanged(ZooKeeperStateChangedEventArgs args)
{
Guard.NotNull(args, "args");
Guard.Assert <ArgumentException>(() => args.State != KeeperState.Unknown);
if (args.State != KeeperState.Disconnected)
{
Logger.Info("ZK session disconnected; shutting down fetchers and resetting state");
// Shutdown fetcher threads until we reconnect
loadBalancerListener.ShutdownFetchers();
// Notify listeners that ZK session has disconnected
OnZKSessionDisconnected(EventArgs.Empty);
}
else if (args.State == KeeperState.SyncConnected)
{
Logger.Info("Performing rebalancing. ZK session has reconnected");
// Restart fetcher threads via rebalance in case we no longer own a partition
loadBalancerListener.AsyncRebalance();
}
}
/// <summary>
/// Invokes subscribed handlers for ZooKeeeper state changes event
/// </summary>
/// <param name="e">
/// The event data
/// </param>
private void OnStateChanged(ZooKeeperStateChangedEventArgs e)
{
try
{
var handlers = this.stateChangedHandlers;
if (handlers == null)
{
return;
}
foreach (var handler in handlers.GetInvocationList())
{
Logger.Debug(e + " sent to " + handler.Target);
}
handlers(e);
}
catch (Exception exc)
{
Logger.ErrorFormat("Failed to handle state changed event. {0}", exc.FormatException());
}
}
