Spring Statemachine Construct Statemachine

阎鸿煊
2023-12-01

StateMachineModel
这里的Model跟MVC模式里的Model是一个意义,是数据模型的意思;在Spring StateMachine内部,各种形式的状态及的配置首先被转换为StateMachineModel模块的表示;

Spring Statemachine使用StateMachineModel蚩尤的信息,构建Statemachine对象;
StateMachineModel->StateMachine的逻辑可以在StateMachineFactory接口的抽象实现AbstractStateMachineFactory中了解到具体细节。

Spring Statemachine提供了4中提供状态及配置的方式

  1. Java configuration
  2. UML(UmlStateMachineModelFactory)
  3. A repository(RepositoryStateMachineModelFactory,spring-statemachine-data-jpa,spring-statemachine-data-redis,spring-statemachine-data-mongodb)
  4. custom StateMachineModel,前三中方式提供的配置信息最终都会转换为StateMachineModel

A machine can be built from Java configuration, UML, or a repository. If you want to go crazy, you can also use a custom StateMachineModel, which is the lowest possible level at which to define configuration.

Spring Statemachine中还有一个persist模块,persist是用来持久花StateMachineContext对象的,也就是persist持久花的是一个Statemachine的运行时信息;上面提到的repository是持久花的配置信息。

Spring Statemachine从repository读取配置信息,构建StatemachineModel配置模型,StatemachineFactory蚩尤StateMachineModelFactory对象的引用,通过StatemachineModel提供的信息构建Statemachine,Statemachine的运行时信息可以通过persist模块持久花到对应的存储,Spring Statemachine默认提供了redis,jpa和mangodb三种持久花方式;

Spring Statemachine提供的data模块同时提供了Statemachine配置信息和运行时信息的持久花能力
spring-statemachine-data-common
spring-statemachine-data-jpa
spring-statemachine-data-redis
spring-statemachine-data-mongodb

StateMachineBuilder

public static StateMachine<String, String> buildMachine(BeanFactory beanFactory) throws Exception {
	Builder<String, String> builder = StateMachineBuilder.builder();

	builder.configureConfiguration()
		.withConfiguration()
			.machineId("myMachineId")
			.beanFactory(beanFactory);

	builder.configureStates()
		.withStates()
			.initial("S1")
			.state("S2");

	builder.configureTransitions()
		.withExternal()
			.source("S1")
			.target("S2")
			.event("E1");

	return builder.build();
}

Custom StateMachineModel

// setup configuration data
ConfigurationData<String, String> configurationData = new ConfigurationData<>();

// setup states data
Collection<StateData<String, String>> stateData = new ArrayList<>();
stateData.add(new StateData<String, String>("S1", true));
stateData.add(new StateData<String, String>("S2"));
StatesData<String, String> statesData = new StatesData<>(stateData);

// setup transitions data
Collection<TransitionData<String, String>> transitionData = new ArrayList<>();
transitionData.add(new TransitionData<String, String>("S1", "S2", "E1"));
TransitionsData<String, String> transitionsData = new TransitionsData<>(transitionData);

// setup model
StateMachineModel<String, String> stateMachineModel = new DefaultStateMachineModel<>(configurationData, statesData,
		transitionsData);

// instantiate machine via factory
ObjectStateMachineFactory<String, String> factory = new ObjectStateMachineFactory<>(stateMachineModel);
StateMachine<String, String> stateMachine = factory.getStateMachine();
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