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//Customer State Machine
const CustomerStateMachine = createMachine(
  {
    id: "customer",

    initial: "pending",

    states: {
      pending: {
        on: {
          PASSWORD_RESET_COMPLETED: {
            target: "active",
            actions: ["activate"],
          },

          DELETE: {
            target: "delete",
            actions: ["delete"],
          },
        },
      },

      active: {
        on: {
          DEACTIVATE: {
            target: "deactive",
            actions: ["deactivate"],
          },

          DELETE: {
            target: "delete",
            actions: ["delete"],
          },
        },
      },

      deactive: {
        on: {
          ACTIVATE: {
            target: "active",
            actions: ["activate"],
          },

          DELETE: {
            target: "delete",
            actions: ["delete"],
          },
        },
      },

      delete: {
        type: "final",
      },
    },
  },
  {
    actions: {
      // action implementations

      activate: async (context, event) => {
        await updateCustomerState(context, event, cepSTATUS.CUSTOMER.ACTIVE);
        console.log("activate called....");
      },

      delete: async (context, event) => {
        await updateCustomerState(context, event, cepSTATUS.CUSTOMER.DELETE);
        console.log("delete customer called....");
      },

      deactivate: async (context, event) => {
        console.log("deactivate customer called....");
        await updateCustomerState(context, event, cepSTATUS.CUSTOMER.DEACTIVE);
        console.log("deactivate customer called....");
      },
    },
  },
);

//update customer state using this function

const updateCustomerState = (context, event, status) =>
  new Promise((resolve, reject) => {
    //customer id validation
    if (!event.customer_id) {
      return reject("Invalid customer id");
    }

    //update customer status here

    Customer.update(
      {
        state: status,
      },
      {
        where: {
          customer_id: event.customer_id,
        },
      },
    )
      .then((cResult) => {
        if (!cResult) {
          return reject("Invalid customer");
        } else {
          return resolve(cResult);
        }
      })
      .catch((err) => {
        return reject("failed to update customer state");
      });
  });

//I have implemented this state machine for customer.

//Call Account State Machine and set account state from pending to active

const customerService = interpret(CustomerStateMachine)
  .onTransition((customerState) => {
    console.log(customerState.value);
  })
  .start();

//below line works for me

customerService.send("PASSWORD_RESET_COMPLETED", { customer_id: decodedToken.customer_id });

//but when I try below to change state of customer to deactivate customer its not working

const service = interpret(CustomerStateMachine)
  .onTransition((customerState) => {
    console.log(customerState.value);
  })
  .start();

const currentState = "active";

const nextState = CustomerStateMachine.transition(currentState, "DEACTIVATE").value;

service.send("DEACTIVATE", { customer_id: customer_id });

我有存储客户的列状态的客户表。其中 state=1 表示挂起，state=2 表示活动 state=3 表示停用，state=4 表示已删除，我必须根据操作管理数据库中的客户状态。我正在尝试使用状态机来检查当前状态下允许的操作。我做错了什么吗？请帮忙。提前致谢。

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1 回答 1

0

我不确定您要实现什么 - 也许您希望机器从与初始“待定”状态不同的状态开始？不确定这是否可能——除了使用基于机器上下文确定下一个状态的瞬态节点之外。

否则，这应该工作：

const customerService = interpret(CustomerStateMachine)
  .onTransition((customerState) => {
    console.log(customerState.value);
  })
  .start();

customerService.send("PASSWORD_RESET_COMPLETED", { customer_id: customer_id });
customerService.send("DEACTIVATE", { customer_id: customer_id });
于 2021-08-25T07:39:07.960 回答