protected override IOperationResult ProcessResponse(BinaryResponse response)
{
var result = new BinaryOperationResult();
var status = response.StatusCode;
this.StatusCode = status;
if (status == 0)
{
var data = response.Data;
if (data.Count != 8)
{
return(result.Fail("Result must be 8 bytes long, received: " + data.Count, new InvalidOperationException()));
}
this.result = BinaryConverter.DecodeUInt64(data.Array, data.Offset);
return(result.Pass());
}
var message = ResultHelper.ProcessResponseData(response.Data);
return(result.Fail(message));
}
private IOperationResult ExecuteWithRedirect(IMemcachedNode startNode, ISingleItemOperation op)
{
var result = new BinaryOperationResult();
var opResult = startNode.Execute(op);
if (opResult.Success)
{
return(result.Pass());
}
var iows = op as IOperationWithState;
// different op factory, we do not know how to retry
if (iows == null)
{
result.InnerResult = opResult.InnerResult;
return(result.Fail("Operation state was invalid"));
}
#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)
{
opResult = node.Execute(op);
if (opResult.Success)
{
return(result.Pass());
}
// the node accepted our request so quit
if (iows.State != OperationState.InvalidVBucket)
{
break;
}
}
}
//TODO: why would this happen?
return(result.Fail("Failed to execute operation"));
}
public IOperationResult Execute(IOperation op)
{
IOperationResult result = new BinaryOperationResult();
IPooledSocket socket = null;
try
{
socket = _pool.Acquire();
if (Log.IsDebugEnabled)
{
Log.DebugFormat("Start execute {0} with {1}", op.Key, socket.InstanceId);
}
var buffers = op.GetBuffer();
socket.Write(buffers);
result = op.ReadResponse(socket);
if (result.Success)
{
result.Pass();
}
}
catch (NodeShutdownException e)
{
string msg = String.Format("Node Shutdown - {0}.", EndPoint);
Log.DebugFormat("m:{0} i:{1}\n{2}", msg, op.Key, e);
result.Fail(msg, e);
result.StatusCode = StatusCode.NodeShutdown.ToInt();
}
catch (QueueTimeoutException e)
{
string msg = String.Format("Queue Timeout - {0}.", EndPoint);
Log.ErrorFormat("m:{0} i:{1}\n{2}", msg, op.Key, e);
result.Fail(msg, e);
result.StatusCode = StatusCode.SocketPoolTimeout.ToInt();
}
catch (IOException e)
{
string msg = String.Format("Exception reading response - {0}", EndPoint);
Log.ErrorFormat("m:{0} s:{1} i:{2}\n{3}", msg, op.Key,
socket == null ? Guid.Empty : socket.InstanceId, e);
result.Fail(msg, e);
if (result.StatusCode == null ||
result.StatusCode == StatusCode.Success.ToInt())
{
result.StatusCode = StatusCode.InternalError.ToInt();
}
}
catch (Exception e)
{
string msg = String.Format("Operation failed - {0}", EndPoint);
Log.ErrorFormat("m:{0} s:{1} i:{2}\n{3}", msg, op.Key,
socket == null ? Guid.Empty : socket.InstanceId, e);
result.Fail(msg, e);
if (result.StatusCode == null ||
result.StatusCode == StatusCode.Success.ToInt())
{
result.StatusCode = StatusCode.InternalError.ToInt();
}
}
finally
{
if (socket != null)
{
if (Log.IsDebugEnabled)
{
Log.DebugFormat("End execute {0} with {1}", op.Key, socket.InstanceId);
}
_pool.Release(socket);
}
}
if (Log.IsDebugEnabled)
{
const string msg = "Operation {0} :i {1} n: {2} t: {3} m: {4} sc: {5} r: {6}";
Log.DebugFormat(msg, result.Success ?
op.RetryAttempts > 0 ? "succeeded*" : "succeeded" :
op.RetryAttempts > 0 ? "failed*" : "failed",
op.Key,
_endpoint, Thread.CurrentThread.Name,
result.Message,
Enum.GetName(typeof(StatusCode), result.StatusCode ?? 0),
op.RetryAttempts);
}
return(result);
}
