protected async Task <StateNodeViewModel> BuildStateNodes(WorkflowDefinition definition, GraphViewModel graph, StateDefinition state, NodeViewModel endNode, NodeViewModel previousNode)
{
var stateNodeGroup = graph.AllClusters.Values.OfType <StateNodeViewModel>().FirstOrDefault(cluster => cluster.State.Name == state.Name);
NodeViewModel?firstNode, lastNode = null;
if (stateNodeGroup != null)
{
return(stateNodeGroup);
}
else
{
stateNodeGroup = new StateNodeViewModel(state, state == definition.GetStartState());
await graph.AddElementAsync(stateNodeGroup);
switch (state)
{
case CallbackStateDefinition callbackState:
{
var actionNodes = await this.BuildActionNodes(graph, callbackState.Action !);
lastNode = this.BuildConsumeEventNode(callbackState.Event !);
foreach (var actionNode in actionNodes)
{
await stateNodeGroup.AddChildAsync(actionNode);
}
await this.BuildEdgeBetween(graph, previousNode, actionNodes.First());
await this.BuildEdgeBetween(graph, actionNodes.Last(), lastNode);
await stateNodeGroup.AddChildAsync(lastNode);
break;
}
case EventStateDefinition eventState:
{
firstNode = this.BuildParellelNode();
lastNode = this.BuildParellelNode();
await stateNodeGroup.AddChildAsync(firstNode);
await this.BuildEdgeBetween(graph, previousNode, firstNode);
foreach (var trigger in eventState.Triggers)
{
var gatewayIn = this.BuildGatewayNode(eventState.Exclusive ? GatewayNodeType.Xor : GatewayNodeType.And);
var gatewayOut = this.BuildGatewayNode(eventState.Exclusive ? GatewayNodeType.Xor : GatewayNodeType.And);
await stateNodeGroup.AddChildAsync(gatewayIn);
await stateNodeGroup.AddChildAsync(gatewayOut);
await this.BuildEdgeBetween(graph, firstNode, gatewayIn);
foreach (var eventName in trigger.Events)
{
var eventNode = this.BuildConsumeEventNode(eventName);
await stateNodeGroup.AddChildAsync(eventNode);
await this.BuildEdgeBetween(graph, gatewayIn, eventNode);
await this.BuildEdgeBetween(graph, eventNode, gatewayOut);
}
foreach (var action in trigger.Actions)
{
var actionsNodes = await this.BuildActionNodes(graph, action);
foreach (var actionNode in actionsNodes)
{
await stateNodeGroup.AddChildAsync(actionNode);
}
await this.BuildEdgeBetween(graph, gatewayOut, actionsNodes.First());
await this.BuildEdgeBetween(graph, actionsNodes.Last(), lastNode);
}
}
await stateNodeGroup.AddChildAsync(lastNode);
break;
}
case ForEachStateDefinition foreachState:
{
firstNode = this.BuildForEachNode(foreachState);
lastNode = this.BuildForEachNode(foreachState);
await stateNodeGroup.AddChildAsync(firstNode);
await this.BuildEdgeBetween(graph, previousNode, firstNode);
foreach (var action in foreachState.Actions)
{
var actionNodes = await this.BuildActionNodes(graph, action);
foreach (var actionNode in actionNodes)
{
await stateNodeGroup.AddChildAsync(actionNode);
}
await this.BuildEdgeBetween(graph, firstNode, actionNodes.First());
await this.BuildEdgeBetween(graph, actionNodes.Last(), lastNode);
}
await stateNodeGroup.AddChildAsync(lastNode);
break;
}
case InjectStateDefinition injectState:
{
lastNode = this.BuildInjectNode(injectState);
await stateNodeGroup.AddChildAsync(lastNode);
await this.BuildEdgeBetween(graph, previousNode, lastNode);
break;
}
case OperationStateDefinition operationState:
{
switch (operationState.ActionMode)
{
case ActionExecutionMode.Parallel:
firstNode = this.BuildParellelNode();
lastNode = this.BuildParellelNode();
await stateNodeGroup.AddChildAsync(firstNode);
await this.BuildEdgeBetween(graph, previousNode, firstNode);
foreach (var action in operationState.Actions)
{
var actionNodes = await this.BuildActionNodes(graph, action);
foreach (var actionNode in actionNodes)
{
await stateNodeGroup.AddChildAsync(actionNode);
}
await this.BuildEdgeBetween(graph, firstNode, actionNodes.First());
await this.BuildEdgeBetween(graph, actionNodes.Last(), lastNode);
}
await stateNodeGroup.AddChildAsync(lastNode);
break;
case ActionExecutionMode.Sequential:
lastNode = previousNode;
foreach (var action in operationState.Actions)
{
var actionNodes = await this.BuildActionNodes(graph, action);
foreach (var actionNode in actionNodes)
{
await stateNodeGroup.AddChildAsync(actionNode);
}
await this.BuildEdgeBetween(graph, lastNode, actionNodes.First());
lastNode = actionNodes.Last();
}
break;
default:
throw new Exception($"The specified action execution mode '{operationState.ActionMode}' is not supported");
}
break;
}
case ParallelStateDefinition parallelState:
{
firstNode = parallelState.CompletionType == ParallelCompletionType.AllOf ? this.BuildParellelNode() : this.BuildGatewayNode(GatewayNodeType.N);
lastNode = parallelState.CompletionType == ParallelCompletionType.AllOf ? this.BuildParellelNode() : this.BuildGatewayNode(GatewayNodeType.N);
await stateNodeGroup.AddChildAsync(firstNode);
await this.BuildEdgeBetween(graph, previousNode, firstNode);
foreach (var branch in parallelState.Branches)
{
foreach (var action in branch.Actions)
{
var actionNodes = await this.BuildActionNodes(graph, action);
foreach (var actionNode in actionNodes)
{
await stateNodeGroup.AddChildAsync(actionNode);
}
await this.BuildEdgeBetween(graph, firstNode, actionNodes.First());
await this.BuildEdgeBetween(graph, actionNodes.Last(), lastNode);
}
}
await stateNodeGroup.AddChildAsync(lastNode);
break;
}
case SleepStateDefinition sleepState:
{
lastNode = this.BuildSleepNode(sleepState);
await stateNodeGroup.AddChildAsync(lastNode);
await this.BuildEdgeBetween(graph, previousNode, lastNode);
break;
}
case SwitchStateDefinition switchState:
{
firstNode = this.BuildGatewayNode(GatewayNodeType.Xor);
await stateNodeGroup.AddChildAsync(firstNode);
await this.BuildEdgeBetween(graph, previousNode, firstNode);
switch (switchState.SwitchType)
{
case SwitchStateType.Data:
{
foreach (var condition in switchState.DataConditions)
{
var caseNode = this.BuildDataConditionNode(condition.Name !); // todo: should be a labeled edge, not a node?
await stateNodeGroup.AddChildAsync(caseNode);
await this.BuildEdgeBetween(graph, firstNode, caseNode);
switch (condition.Type)
{
case ConditionType.End:
await this.BuildEdgeBetween(graph, caseNode, endNode);
break;
case ConditionType.Transition:
var nextStateName = condition.Transition == null ? condition.TransitionToStateName : condition.Transition.NextState;
var nextState = definition.GetState(nextStateName !);
if (nextState == null)
{
throw new Exception($"Failed to find a state with name '{nextStateName}' in definition '{definition.GetUniqueIdentifier()}");
}
var nextStateNode = await this.BuildStateNodes(definition, graph, nextState, endNode, caseNode);
lastNode = nextStateNode.Children.Values.OfType <NodeViewModel>().Last();
break;
default:
throw new Exception($"The specified condition type '${condition.Type}' is not supported");
}
}
var defaultCaseNode = this.BuildDataConditionNode("default");
await stateNodeGroup.AddChildAsync(defaultCaseNode);
await this.BuildEdgeBetween(graph, firstNode, defaultCaseNode);
if (switchState.DefaultCondition.IsEnd ||
switchState.DefaultCondition.End != null)
{
lastNode = defaultCaseNode;
if (!state.IsEnd && state.End == null)
{
await this.BuildEdgeBetween(graph, lastNode, endNode);
}
}
else if (!string.IsNullOrWhiteSpace(switchState.DefaultCondition.TransitionToStateName) ||
switchState.DefaultCondition.Transition != null)
{
var nextStateName = switchState.DefaultCondition.Transition == null ? switchState.DefaultCondition.TransitionToStateName : switchState.DefaultCondition.Transition.NextState;
var nextState = definition.GetState(nextStateName !);
if (nextState == null)
{
throw new Exception($"Failed to find a state with name '{nextStateName}' in definition '{definition.GetUniqueIdentifier()}");
}
var nextStateNode = await this.BuildStateNodes(definition, graph, nextState, endNode, defaultCaseNode);
lastNode = nextStateNode.Children.Values.OfType <NodeViewModel>().Last();
}
}
break;
case SwitchStateType.Event:
{
foreach (var condition in switchState.EventConditions)
{
Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(condition));
var caseNode = this.BuildDataConditionNode(condition.Name ?? condition.Event); // todo: should be a labeled edge, not a node?
await stateNodeGroup.AddChildAsync(caseNode);
await this.BuildEdgeBetween(graph, firstNode, caseNode);
switch (condition.Type)
{
case ConditionType.End:
await this.BuildEdgeBetween(graph, caseNode, endNode);
break;
case ConditionType.Transition:
var nextStateName = condition.Transition == null ? condition.TransitionToStateName : condition.Transition.NextState;
var nextState = definition.GetState(nextStateName !);
if (nextState == null)
{
throw new Exception($"Failed to find a state with name '{nextStateName}' in definition '{definition.GetUniqueIdentifier()}");
}
var nextStateNode = await this.BuildStateNodes(definition, graph, nextState, endNode, caseNode);
lastNode = nextStateNode.Children.Values.OfType <NodeViewModel>().Last();
break;
default:
throw new Exception($"The specified condition type '${condition.Type}' is not supported");
}
}
var defaultCaseNode = this.BuildDataConditionNode("default");
await stateNodeGroup.AddChildAsync(defaultCaseNode);
await this.BuildEdgeBetween(graph, firstNode, defaultCaseNode);
if (switchState.DefaultCondition.IsEnd ||
switchState.DefaultCondition.End != null)
{
lastNode = defaultCaseNode;
if (!state.IsEnd && state.End == null)
{
await this.BuildEdgeBetween(graph, lastNode, endNode);
}
}
else if (!string.IsNullOrWhiteSpace(switchState.DefaultCondition.TransitionToStateName) ||
switchState.DefaultCondition.Transition != null)
{
var nextStateName = switchState.DefaultCondition.Transition == null ? switchState.DefaultCondition.TransitionToStateName : switchState.DefaultCondition.Transition.NextState;
var nextState = definition.GetState(nextStateName !);
if (nextState == null)
{
throw new Exception($"Failed to find a state with name '{nextStateName}' in definition '{definition.GetUniqueIdentifier()}");
}
var nextStateNode = await this.BuildStateNodes(definition, graph, nextState, endNode, defaultCaseNode);
lastNode = nextStateNode.Children.Values.OfType <NodeViewModel>().Last();
}
}
break;
default:
throw new Exception($"The specified switch state type '{switchState.Type}' is not supported");
}
break;
}
default:
throw new Exception($"The specified state type '{state.Type}' is not supported");
}
}
if (lastNode == null)
{
throw new Exception($"Unable to define a last node for state '{state.Name}'. Every switch case should provide a last node.");
}
if (state.IsEnd ||
state.End != null)
{
//Console.WriteLine($"State '{state.Name}' ends");
await this.BuildEdgeBetween(graph, lastNode, endNode);
return(stateNodeGroup);
}
if (!string.IsNullOrWhiteSpace(state.TransitionToStateName) ||
state.Transition != null)
{
var nextStateName = state.Transition == null ? state.TransitionToStateName ! : state.Transition !.NextState;
//Console.WriteLine($"State '{state.Name}' transitions to '{nextStateName}'");
var nextState = definition.GetState(nextStateName);
if (nextState == null)
{
throw new Exception($"Failed to find a state with name '{nextStateName}' in definition '{definition.GetUniqueIdentifier()}'");
}
var nextStateNode = await this.BuildStateNodes(definition, graph, nextState, endNode, lastNode);
await this.BuildEdgeBetween(graph, lastNode, nextStateNode.Children.Values.OfType <NodeViewModel>().First());
return(stateNodeGroup);
}
//Console.WriteLine($"No transition for state '{state.Name}'");
//Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(state));
return(stateNodeGroup);
}