public async Task <TriggerResult> TriggerAsync(TriggerParam param)
{
if (param == null)
{
throw new ArgumentNullException(nameof(param));
}
var entity = param.Instance as IEntityWorkflow;
if (entity == null)
{
// going the non EF way!
_logger.LogTrace($@"Processing a non '${param.Instance.Type}'
entity instance.");
var execution = GetExecution(param.Instance.Type);
return(execution.Trigger(param));
}
TriggerResult result = null;
using (var transaction = _context.Database.BeginTransaction())
{
try
{
Workflow workflow = null;
_logger.LogTrace($@"Processing an '${param.Instance.Type}'
entity instance with Id = ${entity.Id}.");
var execution = GetExecution(param.Instance.Type);
await _context.SaveChangesAsync(); // so entity id gets resolved!
workflow = FindOrCreate(
entity.Id,
param.Instance.Type,
param.Instance.State,
entity.Assignee
);
EnsureWorkflowVariables(workflow, param);
result = execution.Trigger(param);
if (!result.IsAborted)
{
await PersistWorkflow(workflow, param);
await _context.SaveChangesAsync();
transaction.Commit();
}
}
catch (Exception ex)
{
transaction.Rollback();
_logger.LogError(
ex,
$"Error in triggering: {param.Instance.Type}, EntityId: {entity.Id}"
);
var transitionContext = new TransitionContext(param.Instance);
transitionContext.AddError(ex.ToString());
result = new TriggerResult(
param.TriggerName,
transitionContext,
false
);
}
}
return(result);
}