public override string ToString()
{
return(string.Format(
"Node ({0:00}, {1:00}, {2}, {3})",
Position.x,
Position.y,
Walkable ? "Walkable" : "Not Walkable",
State == NodeState.None ? (Walkable ? "Openable" : "Wall") : State.ToString()
));
}
/// <summary>
/// Returns a readable representation of the node, containing its state and id..
/// </summary>
/// <returns>String representation of the node.</returns>
public override string ToString()
{
string state;
if (NodeState == NodeState.Follower)
{
state = "Follower (of " + LeaderId + ")";
}
else
{
state = NodeState.ToString();
}
return("Node (" + NodeId + ") -- " + state);
}
/// <summary>
/// Evaluates the pre and post conditions of the node.
/// </summary>
public static void EvaluateNode(IConditionalNode node)
{
//
// Here is where we do the actual work of calling the
// conditions.
//
// First, set the node into the FeatureCallContext so the
// conditions can know
//
GuidanceCallContext.Current.DefaultConditionTarget = node as INode;
//
// Then, check the preconditions.
// Note: We do not automatically set the result of
// precondition calculation for Fork/Join/Decision/Merge
// to enable them full latitude in state management
//
if (!EvaluateBindings(node.Preconditions))
{
//if (!(node is Fork) &&
// !(node is Join) &&
// !(node is Decision) &&
// !(node is Merge))
if (TraceStateChanges &&
node.State != NodeState.Blocked)
{
tracer.Verbose(Resources.GuidanceConditionsEvaluator_TraceBlockState,
currentExtensionInstance.InstanceName,
node.Name);
}
node.SetState(NodeState.Blocked, false);
}
else
{
NodeState postConditionsState = NodeState.Enabled;
if (currentExtensionInstance != null)
{
if ((currentExtensionInstance.GuidanceWorkflow != null) &&
((GuidanceWorkflow)currentExtensionInstance.GuidanceWorkflow).IgnorePostConditions)
{
postConditionsState = NodeState.Enabled;
}
else
{
postConditionsState = EvaluateBindings(node.Postconditions) ? NodeState.Completed : NodeState.Enabled;
}
}
else if (GuidanceConditionsEvaluator.Current != null &&
GuidanceConditionsEvaluator.Current.guidanceManager != null &&
GuidanceConditionsEvaluator.Current.guidanceManager.ActiveGuidanceExtension != null)
{
if ((GuidanceConditionsEvaluator.Current.guidanceManager.ActiveGuidanceExtension.GuidanceWorkflow != null) &&
((GuidanceWorkflow)GuidanceConditionsEvaluator.Current.guidanceManager.ActiveGuidanceExtension.GuidanceWorkflow).IgnorePostConditions)
{
postConditionsState = NodeState.Enabled;
}
else
{
postConditionsState = EvaluateBindings(node.Postconditions) ? NodeState.Completed : NodeState.Enabled;
}
}
else
{
postConditionsState = EvaluateBindings(node.Postconditions) ? NodeState.Completed : NodeState.Enabled;
}
//
// Same rule for post condtions, let the "big guys"
// calculate state for themselves
//
//if (!(node is Fork) &&
// !(node is Join) &&
// !(node is Decision) &&
// !(node is Merge))
if (TraceStateChanges &&
node.State != postConditionsState)
{
tracer.Verbose(Resources.GuidanceConditionsEvaluator_TraceStateToPostConditions + postConditionsState.ToString() + @" '{0}.{1}'.",
currentExtensionInstance.InstanceName,
node.Name);
}
node.SetState(postConditionsState, false);
}
}
public void SetNodeRole(NodeState newState)
{
if (newState == NodeState.Candidate && !NodeOptions.EnableLeader)
{
Logger.LogWarning(NodeStateService.GetNodeLogId() + "Tried to promote to candidate but node has been disabled.");
return;
}
if (newState != NodeStateService.Role)
{
Logger.LogInformation(NodeStateService.GetNodeLogId() + "Node's role changed to " + newState.ToString());
NodeStateService.SetRole(newState);
switch (newState)
{
case NodeState.Candidate:
ResetTimer(_electionTimeoutTimer, ClusterOptions.ElectionTimeoutMs, ClusterOptions.ElectionTimeoutMs);
StopTimer(_heartbeatTimer);
NodeStateService.InCluster = false;
if (NodeStateService.IsBootstrapped)
{
StartElection();
}
else
{
Logger.LogWarning("Node could not start election as bootstrapping was not complete");
}
break;
case NodeState.Follower:
Random rand = new Random();
//On becoming a follower, wait 5 seconds to allow any other nodes to send out election time outs
ResetTimer(_electionTimeoutTimer, rand.Next(ClusterOptions.ElectionTimeoutMs, ClusterOptions.ElectionTimeoutMs * 2), ClusterOptions.ElectionTimeoutMs);
StopTimer(_heartbeatTimer);
TaskUtility.RestartTask(ref _commitTask, () => MonitorCommits());
break;
case NodeState.Leader:
NodeStateService.CurrentLeader = _nodeStorage.Id;
NodeStateService.ResetLeaderState();
ResetTimer(_heartbeatTimer, 0, ClusterOptions.ElectionTimeoutMs / 4);
StopTimer(_electionTimeoutTimer);
TaskUtility.RestartTask(ref _commitTask, () => MonitorCommits());
NodeStateService.InCluster = true;
TaskUtility.RestartTask(ref _nodeDiscoveryTask, () => NodeDiscoveryLoop());
_clusterConnectionPool.CheckClusterConnectionPool();
break;
case NodeState.Disabled:
StopTimer(_electionTimeoutTimer);
StopTimer(_heartbeatTimer);
break;
}
}
}
public CspPathFailure(NodeState currentState, string message = "Path Failed. You need to backtrack!") : base(
message + $"state: {currentState.ToString()}")
{
}
private void PeriodicCallback(object state)
{
SendBeat();
Trace.WriteLine("SendBeat " + NodeState.ToString());
}
/*
* NodeState
*/
public static YarnProtos.NodeStateProto ConvertToProtoFormat(NodeState e)
{
return(YarnProtos.NodeStateProto.ValueOf(NodeStatePrefix + e.ToString()));
}
public virtual string ToS()
{
return(this.ToString() + ": " + m_nodeState.ToString());
}
/// <summary>
/// Adds node to delta with recursive pass through node parents
/// </summary>
/// <param name="delta">Provider which will accept new nodes</param>
/// <param name="nodeId">Node ID to add</param>
/// <param name="nodeMapping">Mapping between (old ID)->(new ID)</param>
private void AddNodeToAppendableTreeRecursive(DirectNodeProviderUnsafe <Guid, object, EdgeData> delta, Guid nodeId, Dictionary <Guid, Guid> nodeMapping, Dictionary <Guid, NodeState> nodeStates, IsolatedChangeSet <Guid, object, EdgeData> changeSet)
{
// Skip already added nodes
if (!nodeMapping.ContainsKey(nodeId))
{
// Generate new ID
Guid newId = Guid.NewGuid();
// Check node state
NodeState nodeState = NodeState.None;
changeSet.NodeStates.TryGetValue(nodeId, out nodeState);
switch (nodeState)
{
case NodeState.None:
{
// Register in the mapping
nodeMapping.Add(nodeId, newId);
// Get undelrying node
var node = nodes.GetNode(nodeId, NodeAccess.Read);
var newNode = CloneNode(node);
// Set node to commited
newNode.Commited = true;
// Create edge to previous node
newNode.Previous = nodeId;
// New node is created which is copied from underlying provider
delta.SetNode(newId, newNode);
// This change is defined as modification
nodeStates.Add(newId, NodeState.Modified);
// Add node parents from the current snapshot
using (var enumerator = mutableParentProvider.ParentEdges(changeSet.SourceSnapshotId, nodeId))
{
if (enumerator != null)
{
while (enumerator.MoveNext())
{
AddNodeToAppendableTreeRecursive(delta, enumerator.Current.ToNodeId, nodeMapping, nodeStates, changeSet);
}
}
}
// Update parent nodes
UpdateParentNodes(newId, newNode, nodeState, delta, changeSet);
}
break;
case NodeState.Created:
{
// Read the node
var node = changeSet.Nodes.GetNode(nodeId, NodeAccess.ReadWrite);
// Set node to commited
node.Commited = true;
// There is no previous
node.Previous = Guid.Empty;
// Store to delta
delta.SetNode(nodeId, node);
// This change is defined as creation
nodeStates.Add(nodeId, NodeState.Created);
// Update parent nodes
UpdateParentNodes(nodeId, node, nodeState, delta, changeSet);
}
break;
case NodeState.Modified:
{
// Register in the mapping
nodeMapping.Add(nodeId, newId);
// Read the node
var node = changeSet.Nodes.GetNode(nodeId, NodeAccess.ReadWrite);
// Set node to commited
node.Commited = true;
// Set the previous
node.Previous = nodeId;
// Store to delta
delta.SetNode(newId, node);
// This change is defined as modification
nodeStates.Add(newId, NodeState.Modified);
// Add node parents from the current snapshot
using (var enumerator = mutableParentProvider.ParentEdges(changeSet.SourceSnapshotId, nodeId))
{
while (enumerator.MoveNext())
{
AddNodeToAppendableTreeRecursive(delta, enumerator.Current.ToNodeId, nodeMapping, nodeStates, changeSet);
}
}
// Update parent nodes
UpdateParentNodes(newId, node, nodeState, delta, changeSet);
}
break;
case NodeState.Removed:
{
// Update parent nodes
var node = GetNode(nodeId, changeSet);
UpdateParentNodes(nodeId, node, nodeState, delta, changeSet);
}
break;
default:
throw new ArgumentException(nodeState.ToString());
}
}
}
