private static void AddValidationMessage(ref WorkflowConfigurationException workflowConfigurationException, string validationMessage)
{
if (null == workflowConfigurationException)
{
workflowConfigurationException = new WorkflowConfigurationException();
}
workflowConfigurationException.ValidationMessages.Add(validationMessage);
}
/// <summary>
/// Validate workflow configuration against a number of invariants
/// </summary>
internal static void ValidateWorkflowConfiguration(WorkflowConfiguration workflowConfiguration)
{
WorkflowConfigurationException workflowConfigurationException = null;
// 1. make sure that workflow has exactly one initial state
var initialStateCount = workflowConfiguration.States.Count(s => s.Type == StateTypeConfiguration.Initial);
if (initialStateCount != 1)
{
AddValidationMessage(ref workflowConfigurationException, $"Workflow [{workflowConfiguration.Code}] must have exactly one initial state");
}
// 2. make sure that workflow has exactly one failed state
var failedStateCount = workflowConfiguration.States.Count(s => s.Type == StateTypeConfiguration.Initial);
if (failedStateCount != 1)
{
AddValidationMessage(ref workflowConfigurationException, $"Workflow [{workflowConfiguration.Code}] must have exactly one failed state");
}
// 3. there are no state code duplicates
var hasDuplicateState = workflowConfiguration.States
.Any(s => workflowConfiguration.States.Any(si => si != s && string.Equals(si.Code, s.Code, StringComparison.OrdinalIgnoreCase)));
if (hasDuplicateState)
{
AddValidationMessage(ref workflowConfigurationException, $"Workflow [{workflowConfiguration.Code}] must have unique states");
}
// 4. make sure that workflow has zero or exactly one parentToNestedInitial event
var parentToNestedInitialEventCount = workflowConfiguration.Events.Count(e => e.Type == EventTypeConfiguration.ParentToNestedInitial);
if (parentToNestedInitialEventCount > 1)
{
AddValidationMessage(ref workflowConfigurationException,
$"Workflow [{workflowConfiguration.Code}] must have zero or exactly one [{EventTypeConfiguration.ParentToNestedInitial:G}] event");
}
// 5. there are no event code duplicates
var hasDuplicateEvents = workflowConfiguration.Events
.Any(e => workflowConfiguration.Events.Any(ei => ei != e && string.Equals(ei.Code, e.Code, StringComparison.OrdinalIgnoreCase)));
if (hasDuplicateEvents)
{
AddValidationMessage(ref workflowConfigurationException, $"Workflow [{workflowConfiguration.Code}] must have unique events");
}
// 6. do not allow state to have events and incoming asynchronousImmediate transitions simultaneously
var statesWithEvents = workflowConfiguration.States.Where(s => s.Events.Any()).ToList();
var transitionsToStateWithEvents = workflowConfiguration.States.SelectMany(s => s.Transitions)
.Where(t => t.Type == TransitionTypeConfiguration.AsynchronousImmediate)
.Where(t => statesWithEvents.Any(s => s.Code == t.MoveToState));
if (transitionsToStateWithEvents.Any())
{
AddValidationMessage(ref workflowConfigurationException,
$"Workflow [{workflowConfiguration.Code}] has state(s) with events and incoming async transitions");
}
// 7. do not allow duplicated event declaration for the same state
var hasStatesWithDuplicatedEvent = statesWithEvents
.Any(s => s.Events.Any(e => s.Events
.Any(ei => ei != e && string.Equals(ei.Code, e.Code, StringComparison.OrdinalIgnoreCase))));
if (hasStatesWithDuplicatedEvent)
{
AddValidationMessage(ref workflowConfigurationException, $"Workflow [{workflowConfiguration.Code}] has state(s) with duplicated events");
}
// 8. make sure that activity -> retryPolicy -> onFailureTransitionToUse refers to an existing transition within the state
var statesWithCustomFailureTransitions = workflowConfiguration.States
.Where(s => s.Activities.Any(a => !string.IsNullOrEmpty(a.RetryPolicy.OnFailureTransitionToUse))).ToList();
if (statesWithCustomFailureTransitions.Any())
{
var hasMissConfiguredCustomFailureTransitions = statesWithCustomFailureTransitions
.Any(s => s.Activities
.Any(a => !string.IsNullOrEmpty(a.RetryPolicy.OnFailureTransitionToUse) && !s.Transitions
.Any(t => string.Equals(t.MoveToState, a.RetryPolicy.OnFailureTransitionToUse))));
if (hasMissConfiguredCustomFailureTransitions)
{
AddValidationMessage(ref workflowConfigurationException,
$"Workflow [{workflowConfiguration.Code}] has activity(s) with configured 'onFailureTransitionToUse' but state has no such transition");
}
}
if (null != workflowConfigurationException)
{
throw workflowConfigurationException;
}
}