/// <summary>Gets the next activities or null when no condition is available. </summary>
/// <param name="activity">The current workflow activity. </param>
/// <param name="definition">The workflow definition. </param>
/// <returns>The next activities. </returns>
/// <exception cref="WorkflowException">No next activities could be found based on the given condition. </exception>
/// <exception cref="WorkflowException">More then one activity found for condition but activity is not a ForkActivity. </exception>
public IWorkflowActivityBase[] GetNextActivities(IWorkflowActivityBase activity, WorkflowDefinition definition)
{
if (string.IsNullOrEmpty(NextActivitiesCondition))
return null;
var nextActivities = definition.GetOutboundTransitions(activity)
.Where(t => t.Condition == NextActivitiesCondition)
.Select(t => definition.GetActivityById(t.To))
.ToArray();
if (nextActivities.Length == 0)
throw new WorkflowException(
string.Format("No next activities could be found based on the given condition '{0}'. ", NextActivitiesCondition));
if (nextActivities.Length > 1 && !(activity is ForkActivity))
throw new WorkflowException(
string.Format("More then one activity found for condition '{0}' " +
"but activity is not a ForkActivity. ", NextActivitiesCondition));
return nextActivities;
}
/// <exception cref="WorkflowException">A workflow exception occurred. </exception>
private async Task AddNextActivitiesAsync(IWorkflowActivityBase activity, IList <IWorkflowActivityBase> nextActivities)
{
var allowedTransitions = WorkflowDefinition.GetOutboundTransitions(activity);
var hasFollowingActivities = allowedTransitions.Length > 0;
if (!hasFollowingActivities)
{
return;
}
var areNextActivitiesAllowed = nextActivities.All(a => allowedTransitions.Any(t => t.To == a.Id));
if (areNextActivitiesAllowed)
{
await PrepareNextActivities(nextActivities);
}
else
{
throw new WorkflowException(
string.Format("Transitions for activities ({0}) produced by activity ({1}) could not be found. ",
string.Join(", ", nextActivities.Select(a => a.Id)), activity.Id));
}
}
/// <summary>Gets the next activities or null when no condition is available. </summary>
/// <param name="activity">The current workflow activity. </param>
/// <param name="definition">The workflow definition. </param>
/// <returns>The next activities. </returns>
/// <exception cref="WorkflowException">No next activities could be found based on the given condition. </exception>
/// <exception cref="WorkflowException">More then one activity found for condition but activity is not a ForkActivity. </exception>
public IWorkflowActivityBase[] GetNextActivities(IWorkflowActivityBase activity, WorkflowDefinition definition)
{
if (string.IsNullOrEmpty(NextActivitiesCondition))
{
return(null);
}
var nextActivities = definition.GetOutboundTransitions(activity)
.Where(t => t.Condition == NextActivitiesCondition)
.Select(t => definition.GetActivityById(t.To))
.ToArray();
if (nextActivities.Length == 0)
{
throw new WorkflowException(
string.Format("No next activities could be found based on the given condition '{0}'. ", NextActivitiesCondition));
}
if (nextActivities.Length > 1 && !(activity is ForkActivity))
{
throw new WorkflowException(
string.Format("More then one activity found for condition '{0}' " +
"but activity is not a ForkActivity. ", NextActivitiesCondition));
}
return(nextActivities);
}
/// <summary>Initializes a new instance of the <see cref="WorkflowInstance"/> class. </summary>
/// <param name="workflowDefinition">The workflow definition. </param>
/// <param name="data">The data provider. </param>
public WorkflowInstance(WorkflowDefinition workflowDefinition, List <ActivityData> data)
{
Data = data;
WorkflowDefinition = workflowDefinition;
CurrentActivityIds = new List <string>();
}
