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EXAMPLES.md

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Examples

  • ATM State Machine - Example on context insensitive typed state machine
    The sample code could be found in package "org.squirrelframework.foundation.fsm.atm".

  • Decision State Machine - Example on local transition
    This example demonstrated how to leverage local transition and nested state to create a decision node. DecisionStateMachine
    This example can be found in package "org.squirrelframework.foundation.fsm.samples.DecisionStateSampleTest".

  • Simple CSS Parser - Example usage of fluent API
    This example illustrates how to parse incoming characters by define parser grammar in state machine.
    SimpleCssParser
    Parse CSS scripts with SimpleCssParser which is defined as State Machine.

     SimpleCssParser parser = SimpleCssParser.newParser();
 List<CssRule> rules = parser.parse("alpha { width: 100px/*comment1*/; /*comment2*/text-decoration: " + 
 	"/*comment3*/ underlined; } epsilon/*comment4*/, zeta{ height: 34px; } ");

    Sample code to define CssParser could be found in package "org.squirrelframework.foundation.fsm.cssparser".

  • Greedy Snake Game Sample - Sample usage of declarative untyped state machine and timed state
    Here is an interesting example which used state machine to implement greedy snake game controller. The following diagram shows that the state machine definition of the controller.
    SnakeStateMachine
    This example can be found in package "org.squirrelframework.foundation.fsm.snake".

  • Spring Framework Integration
    Squirrel state machine does not have any heavy dependencies, so basically it should be highly embedable. To Integrate with Spring IoC container, basically user can register an statemachine post processor to enable auto wire dependencies. Following StateMachineAutowireProcessor provide the sample implementation.

     package org.squirreframework.foundation.spring;

 import com.google.common.base.Preconditions;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.config.AutowireCapableBeanFactory;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
 import org.springframework.stereotype.Component;
 import org.squirrelframework.foundation.component.SquirrelPostProcessor;
 import org.squirrelframework.foundation.component.SquirrelPostProcessorProvider;
 import org.squirrelframework.foundation.fsm.*;

 /**
  * Support autowire dependencies within spring IoC container
  *
  * @author kailiang.hkl
  * @version : StateMachineAutowireProcessor.java
  */
 @Component
 public class StateMachineAutowireProcessor implements SquirrelPostProcessor<StateMachine>, ApplicationContextAware {

     private ApplicationContext applicationContext;

     public StateMachineAutowireProcessor() {
         // register StateMachineAutowireProcessor as state machine post processor
 	SquirrelPostProcessorProvider.getInstance().register(StateMachine.class, this);
     }

     @Override
     public void postProcess(StateMachine stateMachine) {
 	Preconditions.checkNotNull(stateMachine);
 	// after state machine instance created, 
 	// autoware @Autowired/@Value dependencies and properties within state machine class
 	AutowireCapableBeanFactory autowireCapableBeanFactory = applicationContext.getAutowireCapableBeanFactory();
 	autowireCapableBeanFactory.autowireBean(stateMachine);
     }

     @Override
     public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
 	this.applicationContext = applicationContext;
     }
 }

  • Andriod Integration
    Thanks to Vyacheslav Blinov to provide this sample project for squirrel state machine used in android.

  • Use Cases
    The following links linked to some good articles about how to use squirrel state machine library. If the author does not like to be referred here, please contact me. I will withdraw immediately.