这里用一个订单流程的例子来学习：
@Data
public class Order {
private int id;
private OrderStatus status;
@Override
public String toString() {
return "订单号：" + id + ", 订单状态：" + status;
}
}
/**
* 订单状态
*/
public enum OrderStatus {
// 待支付，待发货，待收货，订单结束
WAIT_PAYMENT, WAIT_DELIVER, WAIT_RECEIVE, FINISH;
}
/**
* 订单状态改变事件
*/
public enum OrderStatusChangeEvent {
// 支付，发货，确认收货
PAYED, DELIVERY, RECEIVED;
}
public interface IOrderService {
//创建新订单
Order create();
//发起支付
Order pay(int id);
//订单发货
Order deliver(int id);
//订单收货
Order receive(int id);
//获取所有订单信息
Map<Integer, Order> getOrders();
}
@Service("orderService")
public class OrderServiceImpl implements IOrderService {
@Autowired
private StateMachine<OrderStatus, OrderStatusChangeEvent> orderStateMachine;
@Autowired
private StateMachinePersister<OrderStatus, OrderStatusChangeEvent, Order> persister;
private int id = 1;
private Map<Integer, Order> orders = new HashMap<>();
public Order create() {
Order order = new Order();
order.setStatus(OrderStatus.WAIT_PAYMENT);
order.setId(id++);
orders.put(order.getId(), order);
return order;
}
public Order pay(int id) {
Order order = orders.get(id);
System.out.println("线程名称：" + Thread.currentThread().getName() + " 尝试支付，订单号：" + id);
Message message = MessageBuilder.withPayload(OrderStatusChangeEvent.PAYED).setHeader("order", order).build();
if (!sendEvent(message, order)) {
System.out.println("线程名称：" + Thread.currentThread().getName() + " 支付失败, 状态异常，订单号：" + id);
}
return orders.get(id);
}
public Order deliver(int id) {
Order order = orders.get(id);
System.out.println("线程名称：" + Thread.currentThread().getName() + " 尝试发货，订单号：" + id);
if (!sendEvent(MessageBuilder.withPayload(OrderStatusChangeEvent.DELIVERY).setHeader("order", order).build(), orders.get(id))) {
System.out.println("线程名称：" + Thread.currentThread().getName() + " 发货失败，状态异常，订单号：" + id);
}
return orders.get(id);
}
public Order receive(int id) {
Order order = orders.get(id);
System.out.println("线程名称：" + Thread.currentThread().getName() + " 尝试收货，订单号：" + id);
if (!sendEvent(MessageBuilder.withPayload(OrderStatusChangeEvent.RECEIVED).setHeader("order", order).build(), orders.get(id))) {
System.out.println("线程名称：" + Thread.currentThread().getName() + " 收货失败，状态异常，订单号：" + id);
}
return orders.get(id);
}
public Map<Integer, Order> getOrders() {
return orders;
}
/**
* 发送订单状态转换事件
*
* @param message
* @param order
* @return
*/
private synchronized boolean sendEvent(Message<OrderStatusChangeEvent> message, Order order) {
boolean result = false;
try {
orderStateMachine.start();
//尝试恢复状态机状态
persister.restore(orderStateMachine, order);
//添加延迟用于线程安全测试
Thread.sleep(1000);
result = orderStateMachine.sendEvent(message);
//持久化状态机状态
persister.persist(orderStateMachine, order);
} catch (Exception e) {
e.printStackTrace();
} finally {
orderStateMachine.stop();
}
return result;
}
}
package com.gupaoedu.vip.pattern.state.order;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.statemachine.StateMachineContext;
import org.springframework.statemachine.StateMachinePersist;
import org.springframework.statemachine.config.EnableStateMachine;
import org.springframework.statemachine.config.StateMachineConfigurerAdapter;
import org.springframework.statemachine.config.builders.StateMachineStateConfigurer;
import org.springframework.statemachine.config.builders.StateMachineTransitionConfigurer;
import org.springframework.statemachine.persist.DefaultStateMachinePersister;
import org.springframework.statemachine.support.DefaultStateMachineContext;
import java.util.EnumSet;
/**
* 订单状态机配置
*/
@Configuration
@EnableStateMachine(name = "orderStateMachine")
public class OrderStateMachineConfig extends StateMachineConfigurerAdapter<OrderStatus, OrderStatusChangeEvent> {
/**
* 配置状态
* @param states
* @throws Exception
*/
public void configure(StateMachineStateConfigurer<OrderStatus, OrderStatusChangeEvent> states) throws Exception {
states
.withStates()
.initial(OrderStatus.WAIT_PAYMENT)
.states(EnumSet.allOf(OrderStatus.class));
}
/**
* 配置状态转换事件关系
* @param transitions
* @throws Exception
*/
public void configure(StateMachineTransitionConfigurer<OrderStatus, OrderStatusChangeEvent> transitions) throws Exception {
transitions
.withExternal().source(OrderStatus.WAIT_PAYMENT).target(OrderStatus.WAIT_DELIVER).event(OrderStatusChangeEvent.PAYED)
.and()
.withExternal().source(OrderStatus.WAIT_DELIVER).target(OrderStatus.WAIT_RECEIVE).event(OrderStatusChangeEvent.DELIVERY)
.and()
.withExternal().source(OrderStatus.WAIT_RECEIVE).target(OrderStatus.FINISH).event(OrderStatusChangeEvent.RECEIVED);
}
/**
* 持久化配置
* 实际使用中，可以配合redis等，进行持久化操作
* @return
*/
@Bean
public DefaultStateMachinePersister persister(){
return new DefaultStateMachinePersister<>(new StateMachinePersist<Object, Object, Order>() {
@Override
public void write(StateMachineContext<Object, Object> context, Order order) throws Exception {
//此处并没有进行持久化操作
}
@Override
public StateMachineContext<Object, Object> read(Order order) throws Exception {
//此处直接获取order中的状态，其实并没有进行持久化读取操作
return new DefaultStateMachineContext(order.getStatus(), null, null, null);
}
});
}
}
import org.springframework.messaging.Message;
import org.springframework.statemachine.annotation.OnTransition;
import org.springframework.statemachine.annotation.WithStateMachine;
import org.springframework.stereotype.Component;
@Component("orderStateListener")
@WithStateMachine(name = "orderStateMachine")
public class OrderStateListenerImpl{
@OnTransition(source = "WAIT_PAYMENT", target = "WAIT_DELIVER")
public boolean payTransition(Message<OrderStatusChangeEvent> message) {
Order order = (Order) message.getHeaders().get("order");
order.setStatus(OrderStatus.WAIT_DELIVER);
System.out.println("支付，状态机反馈信息：" + message.getHeaders().toString());
return true;
}
@OnTransition(source = "WAIT_DELIVER", target = "WAIT_RECEIVE")
public boolean deliverTransition(Message<OrderStatusChangeEvent> message) {
Order order = (Order) message.getHeaders().get("order");
order.setStatus(OrderStatus.WAIT_RECEIVE);
System.out.println("发货，状态机反馈信息：" + message.getHeaders().toString());
return true;
}
@OnTransition(source = "WAIT_RECEIVE", target = "FINISH")
public boolean receiveTransition(Message<OrderStatusChangeEvent> message){
Order order = (Order) message.getHeaders().get("order");
order.setStatus(OrderStatus.FINISH);
System.out.println("收货，状态机反馈信息：" + message.getHeaders().toString());
return true;
}
}
@SpringBootApplication
public class Test {
public static void main(String[] args) {
Thread.currentThread().setName("主线程");
ConfigurableApplicationContext context = SpringApplication.run(Test.class,args);
IOrderService orderService = (IOrderService)context.getBean("orderService");
orderService.create();
orderService.create();
orderService.pay(1);
new Thread("客户线程"){
@Override
public void run() {
orderService.deliver(1);
orderService.receive(1);
}
}.start();
orderService.pay(2);
orderService.deliver(2);
orderService.receive(2);
System.out.println("全部订单状态：" + orderService.getOrders());
}
}
