设置Spring StateMachine的当前状态

Question

我开始使用Spring Statemachine，但在管理对象的状态时遇到了一些麻烦。

null

@Service
public class StateMachineServiceImpl implements IStateMachineService {

    @Autowired
    private IShipmentService shipmentService;

    @Override
    public StateMachine<ShipmentState, ShipmentEvent> getShipmentStateMachine(Shipment aShipment) throws Exception {

        Builder<ShipmentState, ShipmentEvent> builder = StateMachineBuilder.builder();

        builder.configureStates().withStates()
            .state(ShipmentState.S1)
            .state(ShipmentState.S2)
            .state(ShipmentState.S3)
            .initial(shipmentService.getState())
            .end(ShipmentState.S4);

        builder.configureTransitions().withExternal().source(ShipmentState.S1).target(ShipmentState.S1)
                .event(ShipmentEvent.S3).action(shipmentService.updateAction()).and().withExternal()
                .source(ShipmentState.S1).target(ShipmentState.S2).event(ShipmentEvent.S3)
                .action(shipmentService.finalizeAction()).and().withExternal().source(ShipmentState.S3)
                .target(ShipmentEvent.S4).action(shipmentService.closeAction()).event(ShipmentEvent.S5);

        return builder.build();
    }

}

你觉得我的做法怎么样？

Answer 1

这种方法没有问题。您可以使用以下代码将状态机重置为特定状态。

stateMachine.getStateMachineAccessor().doWithAllRegions(access -> access
          .resetStateMachine(new DefaultStateMachineContext<>(state, null, null,null)));

您可以根据您的用例将参数传递给DefaultStateMachineContext。