使用 Objective-C 编写的简单状态机

使用 Objective-C 编写的非常简单的状态机。

特性

• 进入动作
• 退出动作
• 转换上的动作
• 决策
• 异步模式
• 异步模式下的计时事件
• 日志记录

自动门示例

//Create structure  
SMStateMachine *sm = [[SMStateMachine alloc] init];  
sm.globalExecuteIn = self; //execute all selectors on self object  
SMState *opened = [sm createState:@"open"];  
SMState *closed = [sm createState:@"closed"];  
sm.initialState = closed;  
[opened setEntrySelector:@selector(greenLightOn)];  
[closed setEntrySelector:@selector(redLightOn)];  
[sm transitionFrom:closed to:opened forEvent:@"coin"];  
[sm transitionFrom:opened to:closed forEvent:@"pass"];  
[sm transitionFrom:opened to:closed forEvent:@"timeout"];  
[sm transitionFrom:opened to:opened forEvent:@"coin" withSel:@selector(returnCoin)];    


//Usage
[sm validate];  
[sm post:@"coin"];  
[sm post:@"pass"];

决策示例

//Create structure  
__weak id weakSelf = self;  
SMStateMachine *sm = [[SMStateMachine alloc] init];  
sm.globalExecuteIn = self; //execute all selectors on self object  
SMState *opened = [sm createState:@"open"];  
SMState *closed = [sm createState:@"closed"];  
SMDecision *isWorkTime = [sm createDecision:@"isWorkTime" withPredicateBoolBlock:^(){  
   return [weakSelf isWorkTime];  
}];  
sm.initialState = closed;  
[opened setEntrySelector:@selector(greenLightOn)];  
[closed setEntrySelector:@selector(redLightOn)];  
[sm transitionFrom:closed to:isWorkTime forEvent:@"coin"];  
[sm trueTransitionFrom:isWorkTime to:opened];  
[sm falseTransitionFrom:isWorkTime to:closed withSel:@selector(returnCoin)];  
[sm transitionFrom:opened to:closed forEvent:@"pass"];  
[sm transitionFrom:opened to:closed forEvent:@"timeout"];  
[sm transitionFrom:opened to:opened forEvent:@"coin" withSel:@selector(returnCoin)];  
[sm validate];  

//Usage
self.isWorkTime = NO;
self.returnCoinsCounter = 0;
[sm post:@"coin"];
STAssertEquals(1, self.returnCoinsCounter, nil);
self.isWorkTime = YES;
[sm post:@"coin"];
STAssertEquals(1, self.returnCoinsCounter, nil);
[sm post:@"coin"];
STAssertEquals(2, self.returnCoinsCounter, nil);`

日志记录示例

要启用日志记录，您需要将 fsm 对象的 monitor 属性设置为 SMMonitorDelegate 协议实现。
您可以使用默认的 SMMonitorNSLog 实现，或编写您自己的实现。

注意！ 您需要保留对监视对象的强引用，因为 fsm 监视属性被描述为 @property(nonatomic, weak) id <SMMonitorDelegate> monitor;

//strong ref to monitor object
SMMonitorNSLog *nsLogMonitor =[[SMMonitorNSLog alloc] initWithSmName:@"Turnstile"];
SMStateMachine *sm = [[SMStateMachine alloc] init]; 
//log to NSLog
sm.monitor = nsLogMonitor;
...

PS 随时欢迎与我联系：)