private async void OnClusterChange(object source, ClusterChangedEvent args)
{
var logger = LoggerManager.GetLogger("CqlSharp.Cluster.Changes");
if (args.Change.Equals(ClusterChange.New))
{
//get the connection from which we received the event
var connection = (Connection)source;
//get the new peer
using (var result = await ExecQuery(connection, "select rpc_address, data_center, rack, tokens from system.peers where peer = '" + args.Node + "'", logger).ConfigureAwait(false))
{
if (await result.ReadAsync().ConfigureAwait(false))
{
var newNode = new Node((IPAddress)result["rpc_address"], this)
{
DataCenter = (string)result["data_center"],
Rack = (string)result["rack"],
Tokens = (ISet <string>)result["tokens"]
};
if (InDiscoveryScope(_nodes.First(), newNode, _config.DiscoveryScope))
{
logger.LogInfo("{0} added to the cluster", newNode);
_nodes.Add(newNode);
}
else
{
logger.LogVerbose("new {0} is ignored as it does not fit in the discovery scope", newNode);
}
}
}
}
else if (args.Change.Equals(ClusterChange.Removed))
{
Node removedNode = _nodes.FirstOrDefault(node => args.Node.Equals(node.Address));
if (removedNode != null)
{
_nodes.Remove(removedNode);
logger.LogInfo("{0} was removed from the cluster", removedNode);
}
else
{
logger.LogVerbose("Node with address {0} was removed but not used within the current configuration", args.Node);
}
}
else if (args.Change.Equals(ClusterChange.Up))
{
Node upNode = _nodes.FirstOrDefault(node => args.Node.Equals(node.Address));
if (upNode != null)
{
using (logger.ThreadBinding())
{
upNode.Reactivate();
}
}
}
}
private async void OnClusterChange(object source, ClusterChangedEvent args)
{
var logger = LoggerManager.GetLogger("CqlSharp.Cluster.Changes");
if (args.Change.Equals(ClusterChange.New))
{
//get the connection from which we received the event
var connection = (Connection)source;
//get the new peer
using (var result = await ExecQuery(connection, "select rpc_address, data_center, rack, tokens from system.peers where peer = '" + args.Node + "'", logger).ConfigureAwait(false))
{
if (await result.ReadAsync().ConfigureAwait(false))
{
var newNode = new Node((IPAddress)result["rpc_address"], this)
{
DataCenter = (string)result["data_center"],
Rack = (string)result["rack"],
Tokens = (ISet<string>)result["tokens"]
};
if (InDiscoveryScope(_nodes.First(), newNode, _config.DiscoveryScope))
{
logger.LogInfo("{0} added to the cluster", newNode);
_nodes.Add(newNode);
}
else
{
logger.LogVerbose("new {0} is ignored as it does not fit in the discovery scope", newNode);
}
}
}
}
else if (args.Change.Equals(ClusterChange.Removed))
{
Node removedNode = _nodes.FirstOrDefault(node => args.Node.Equals(node.Address));
if (removedNode != null)
{
_nodes.Remove(removedNode);
logger.LogInfo("{0} was removed from the cluster", removedNode);
}
else
{
logger.LogVerbose("Node with address {0} was removed but not used within the current configuration", args.Node);
}
}
else if (args.Change.Equals(ClusterChange.Up))
{
Node upNode = _nodes.FirstOrDefault(node => args.Node.Equals(node.Address));
if (upNode != null)
{
using (logger.ThreadBinding())
{
upNode.Reactivate();
}
}
}
}
private async void OnClusterChange(object source, ClusterChangedEvent args)
{
if(_disposed)
return;
var logger = LoggerManager.GetLogger("CqlSharp.Cluster.Changes");
try
{
if(args.Change.Equals(ClusterChange.New) || args.Change.Equals(ClusterChange.Removed))
{
//delay as Cassandra is typically to early with sending these changes (Gossip needs to settle)
await Task.Delay(5000).AutoConfigureAwait();
logger.LogVerbose("Cluster changed: {0} is {1}", args.Node, args.Change);
//get the connection from which we received the event
var connection = (Connection)source;
var node = connection.Node;
//refetch the cluster configuration
await
GetClusterInfoAsync(node, logger, CancellationToken.None)
.AutoConfigureAwait();
}
else if(args.Change.Equals(ClusterChange.Up))
{
Node upNode = _nodes.FirstOrDefault(node => args.Node.Equals(node.Address));
if(upNode != null)
{
//delay as Cassandra is typically to early with sending these changes (Gossip needs to settle)
await Task.Delay(5000).AutoConfigureAwait();
using(logger.ThreadBinding())
{
upNode.Reactivate();
}
}
}
}
catch(Exception ex)
{
logger.LogError("Exception occured while handling cluster change {0} - {1}: {2}", args.Node, args.Change,
ex);
}
}