/// <summary>
/// Calls FindSuccessor() remotely, using a default retry value of three.
/// </summary>
/// <param name="node">The remote node on which to call FindSuccessor().</param>
/// <param name="id">The ID to look up.</param>
/// <param name="retryCount">The number of times to retry the operation in case of error.</param>
/// <returns>The Successor of ID, or NULL in case of error.</returns>
public static ChordNode CallFindSuccessor(ChordNode node, ulong id, int retryCount = RetryCount)
{
var instance = Instance(node);
while (retryCount-- > 0)
{
try
{
if (ChordNodeInstance.IsInstanceValid(instance, "CallFindSuccessor111111111"))
{
var retVal = instance.FindSuccessor(id);
instance.Close();
return(retVal);
}
}
catch (Exception e)
{
Log(LogLevel.Debug, "Remote Invoker", $"CallFindSuccessor error: {e.Message}");
}
}
if (ChordNodeInstance.IsInstanceValid(instance, "CallFindSuccessor222222222222"))
{
instance.Close();
}
return(null);
}
public static void CallNotify(ChordNode remoteNode, ChordNode node, int retryCount = RetryCount)
{
var instance = Instance(remoteNode);
while (retryCount-- > 0)
{
try
{
if (ChordNodeInstance.IsInstanceValid(instance, "CallNotify1111111111111111111"))
{
instance.Notify(node);
instance.Close();
return;
}
}
catch (Exception e)
{
Log(LogLevel.Debug, "Remote Invoker", $"CallNotify error: {e.Message}");
}
}
if (ChordNodeInstance.IsInstanceValid(instance, "CallNotify2222222222222222") && instance.State != CommunicationState.Closed)
{
instance.Close();
}
}
public static ChordNode GetPredecessor(ChordNode node, int retryCount = RetryCount)
{
var instance = Instance(node);
while (retryCount-- > 0)
{
try
{
if (ChordNodeInstance.IsInstanceValid(instance, "GetPredecessor111111111111"))
{
var retVal = instance.Predecessor;
instance.Close();
return(retVal);
}
}
catch (Exception e)
{
Log(LogLevel.Debug, "Remote Accessor", $"GetPredecessor error: {e.Message}");
}
}
if (ChordNodeInstance.IsInstanceValid(instance, "GetPredecessor222222222222222") && instance.State != CommunicationState.Closed)
{
instance.Close();
}
return(null);
}
private ChordNode GetValidNode()
{
var list = GetNodes();
ChordNode node = null;
foreach (var n in list)
{
if (ChordNodeInstance.IsInstanceValid(ChordServer.Instance(n), "send file"))
{
node = n;
break;
}
}
return(node);
}
public static List <ChordNode> FindServiceAddress()
{
var discoveryClient = new DiscoveryClient(new UdpDiscoveryEndpoint());
Log(LogLevel.Debug, "Discovery", "Discovering ChordNode Instances");
try
{
var endpoints = discoveryClient.Find(new FindCriteria(typeof(IChordNodeInstance))
{
MaxResults = 4
}).Endpoints;
var tmp = endpoints.Select(x => {
var inst = Instance(x.Address);
ChordNode ret = null;
if (ChordNodeInstance.IsInstanceValid(inst, "from FindServiceAddress"))
{
ret = !inst.LocalNode.Equals(ChordServer.LocalNode) ? inst.LocalNode : null;
inst.Close();
}
return(ret);
}).Where(x => x != null).ToList();
if (endpoints.Count > 0)
{
Log(LogLevel.Debug, "FindServiceAddress", $"Discovery {tmp.Count} nodes found");
return(tmp);
}
else
{
Log(LogLevel.Error, "Discovery", "Nothing found");
}
}
catch (Exception e)
{
Log(LogLevel.Error, "Discovery", "Nothing found");
}
return(new List <ChordNode>());
}
