/// <summary>
/// 执行退回操作
/// </summary>
internal override void Execute()
{
var runningNode = base.SendBackOperation.BackwardFromActivityInstance;
//创建撤销到上一步的节点记录
var psc = new PreviousStepChecker();
var previousAdjacentBrotherNode = psc.GetPreviousOfMultipleInstanceNode(
runningNode.MIHostActivityInstanceID.Value,
runningNode.ID,
runningNode.CompleteOrder.Value);
CreateBackwardActivityTaskOfInnerMultipleInstance(this.SendBackOperation.ProcessInstance,
previousAdjacentBrotherNode,
base.SendBackOperation.BackwardType,
base.SendBackOperation.BackwardFromActivityInstance.ID,
base.SendBackOperation.ActivityResource,
base.Session);
//创建新的一条待办状态的记录，用于下次执行
var newSuspendNode = base.ActivityInstanceManager.CreateActivityInstanceObject(runningNode);
newSuspendNode.ActivityState = (short)ActivityStateEnum.Suspended;
newSuspendNode.MIHostActivityInstanceID = runningNode.MIHostActivityInstanceID;
newSuspendNode.CompleteOrder = runningNode.CompleteOrder;
newSuspendNode.ComplexType = runningNode.ComplexType;
newSuspendNode.SignForwardType = runningNode.SignForwardType;
newSuspendNode.AssignedToUserIDs = runningNode.AssignedToUserIDs;
newSuspendNode.AssignedToUserNames = runningNode.AssignedToUserNames;
base.ActivityInstanceManager.Insert(newSuspendNode, base.Session);
//同时为此活动实例，创建新的任务
base.TaskManager.Renew(runningNode, newSuspendNode, base.SendBackOperation.ActivityResource.AppRunner, base.Session);
}
