private bool ExecuteWithRedirect(IMemcachedNode startNode, ISingleItemOperation op)
{
if (startNode.Execute(op))
{
return(true);
}
var iows = op as IOperationWithState;
// different op factory, we do not know how to retry
if (iows == null)
{
return(false);
}
#if HAS_FORWARD_MAP
// node responded with invalid vbucket
// this should happen only when a node is in a transitioning state
if (iows.State == OpState.InvalidVBucket)
{
// check if we have a forward-locator
// (whihc supposedly reflects the state of the cluster when all vbuckets have been migrated succesfully)
IMemcachedNodeLocator fl = this.nsPool.ForwardLocator;
if (fl != null)
{
var nextNode = fl.Locate(op.Key);
if (nextNode != null)
{
// the node accepted the requesta
if (nextNode.Execute(op))
{
return(true);
}
}
}
}
#endif
// still invalid vbucket, try all nodes in sequence
if (iows.State == OperationState.InvalidVBucket)
{
var nodes = this.Pool.GetWorkingNodes();
foreach (var node in nodes)
{
if (node.Execute(op))
{
return(true);
}
// the node accepted our request so quit
if (iows.State != OperationState.InvalidVBucket)
{
break;
}
}
}
return(false);
}
public IMemcachedNode Locate(string key)
{
return(nodeLocator.Locate(key));
}
IMemcachedNode IServerPool.Locate(string key)
{
var node = NodeLocator.Locate(key);
return(node);
}
