bool IProcessService.CanRollback(Process process, User previousActioner, out ActivityInstanceBase previous, out string reason)
{
//TODO:是否要为rollback引入代理逻辑?
reason = string.Empty;
previous = null;
if (!this.IsStatusOrSchedulingSafe(process, ProcessStatus.Active))
{
if (this._log.IsDebugEnabled)
{
this._log.DebugFormat("不允许回滚：{0}", reason = "只有处于活动状态的流程才允许回滚");
}
return(false);
}
previous = (this as IProcessService).GetPreviousActivityInstance(process);
#region 常规判断
if (previous == null)
{
if (this._log.IsDebugEnabled)
{
this._log.DebugFormat("不允许回滚：{0}", reason = "没有找到上一个节点信息");
}
return(false);
}
if (!(previous is HumanActivityInstance))
{
if (this._log.IsDebugEnabled)
{
this._log.DebugFormat("不允许回滚：{0}", reason = "上一个节点不是人工节点");
}
return(false);
}
if (process.ProcessType.GetActivitySetting(previous.ActivityName).IsChildOfActivity)
{
if (this._log.IsDebugEnabled)
{
this._log.DebugFormat("不允许回滚：{0}", reason = string.Format("上一节点“{0}”是其他节点的子节点，不支持回滚", previous.ActivityName));
}
return(false);
}
#endregion
#region 一个节点是人工节点才允许回滚
var human = previous as HumanActivityInstance;
if (!human.IsReady(previousActioner))
{
if (this._log.IsDebugEnabled)
{
this._log.DebugFormat("不允许回滚：{0}", reason = "传入的上一节点执行人并非实际执行人");
}
return(false);
}
if (human.Actioners.Length > 1)
{
if (this._log.IsDebugEnabled)
{
this._log.DebugFormat("不允许回滚：{0}", reason = string.Format("上一节点“{0}”执行人大于一人，不允许回滚", previous.ActivityName));
}
return(false);
}
if (_workItemRepository.FindAllByProcess(process).FirstOrDefault(o => o.Status != WorkItemStatus.New) != null)
{
if (this._log.IsDebugEnabled)
{
this._log.DebugFormat("不允许回滚：{0}", reason = string.Format("由于流程当前任务已开始被处理，无法回滚"));
}
return(false);
}
#endregion
//TODO:目前未考虑子流程节点的情况
return(true);
}
//只获取有效状态的任务
IEnumerable <WorkItem> IWorkItemService.GetWorkItems(Process process)
{
return(_repository.FindAllByProcess(process));
}