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本篇文章給大家分享的是有關(guān)Springboot中怎么消除switch-case,小編覺得挺實(shí)用的,因此分享給大家學(xué)習(xí),希望大家閱讀完這篇文章后可以有所收獲,話不多說,跟著小編一起來看看吧。
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基本邏輯如下:
String event = crsRequest.getEvent(); CRSResponse crsResponse = null; switch (event) { case CRSRequestEvent.APP_START: crsResponse = processAppStartCommand(crsRequest); break; case CRSRequestEvent.INIT_COMPLETE: crsResponse = processInitCompleteCommand(crsRequest); break; case CRSRequestEvent.COLLECT_COMPLETE: crsResponse = processCollectCompleteCommand(crsRequest); break; case CRSRequestEvent.COLLECT_NO_INPUT: crsResponse = processCollectNoInputCommand(crsRequest); break; case CRSRequestEvent.PLAY_COMPLETE: crsResponse = processPlayCompleteCommand(crsRequest); break; default: }
寫完會(huì)發(fā)現(xiàn),隨著事件的增加,這段代碼會(huì)很長(zhǎng),每個(gè)事件的處理函數(shù)也都集中在一個(gè)類當(dāng)中,不好維護(hù)。因此,通過搜索學(xué)習(xí)發(fā)現(xiàn),可以使用Springboot的注解+策略模式+簡(jiǎn)單工廠的方式來消除switch-case。
重構(gòu)
定義結(jié)構(gòu)體
public enum CRSEvent { APP_START("APP_START"), INIT_COMPLETE("INIT_COMPLETE"), PLAY_COMPLETE("PLAY_COMPLETE"), COLLECT_COMPLETE("COLLECT_COMPLETE"), COLLECT_NO_INPUT("COLLECT_NO_INPUT"), APP_END("APP_END"), RESP_ERROR_CMD("RESP_ERROR_CMD"); private String event; CRSEvent(String event){ this.event = event; } public String getEvent() { return event; } public void setEvent(String event) { this.event = event; } }
定義一個(gè)注解
@Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) public @interface CRSEventAnnotation { CRSEvent value(); }
定義事件處理接口
public interface EventProcess { CRSResponse execute(CRSRequest resquest); }
所有的時(shí)間處理類都要實(shí)現(xiàn)這個(gè)接口。其中,execute是事件的處理方法
編寫具體的時(shí)間處理類
接下來,逐個(gè)的編寫事件處理類,舉下面一個(gè)例子:
@Component("appStartProcess") @CRSEventAnnotation(value = CRSEvent.APP_START) public class AppStartProcess implements EventProcess{ @Override public CRSResponse execute(CRSRequest resquest) { CRSResponse response = new CRSResponse(); response.setCommand(CRSResponseCmd.IVR_SESSION_INIT); CRSResponse.Message message = new CRSResponse.Message(); message.setTts_vid("65580"); message.setTts_speed("120"); response.setMessage(message); return response; } }
定義SpringContext工具類
@Component public class SpringContextUtil implements ApplicationContextAware{ private ApplicationContext context; public ApplicationContext getContext(){ return context; } @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.context = applicationContext; } }
定義事件處理類工廠,用來生產(chǎn)各種事件處理對(duì)象
@Component public class EventProcessFactory { @Autowired SpringContextUtil contextUtil; private static MapeventProcessMap = new ConcurrentHashMap<>(); public EventProcessFactory() { Map beanMap = contextUtil.getContext().getBeansWithAnnotation(CRSEventAnnotation.class); for (Object evetProcess : beanMap.values()) { CRSEventAnnotation annotation = evetProcess.getClass().getAnnotation(CRSEventAnnotation.class); eventProcessMap.put(annotation.value(), (EventProcess) evetProcess); } } public static EventProcess createEventProcess(CRSEvent event){ return eventProcessMap.get(event); } }
調(diào)用代碼修改
CRSEvent crsEvent = CRSEvent.valueOf(crsRequest.getEvent()); EventProcess eventProcess = EventProcessFactory.createEventProcess(crsEvent); if (eventProcess != null){ return eventProcess.execute(crsRequest); } return null;
這樣,代碼就沒有了switch-case,增加一個(gè)事件也很簡(jiǎn)單,只需要實(shí)現(xiàn)EventProcess接口即可。
以上就是Springboot中怎么消除switch-case,小編相信有部分知識(shí)點(diǎn)可能是我們?nèi)粘9ぷ鲿?huì)見到或用到的。希望你能通過這篇文章學(xué)到更多知識(shí)。更多詳情敬請(qǐng)關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。
本文標(biāo)題:Springboot中怎么消除switch-case
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