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This article mainly introduces "how to eliminate switch-case in Springboot". In daily operation, I believe many people have doubts about how to eliminate switch-case in Springboot. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "how to eliminate switch-case in Springboot"! Next, please follow the editor to study!

The basic logic is as follows:

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:}

After writing, you will find that as the number of events increases, this code will be very long, and the handling functions for each event will be concentrated in one class, which is difficult to maintain. Therefore, through search learning, it is found that Springboot's annotations + policy pattern + simple factory can be used to eliminate switch-case.

Reconstruct

Define the structure

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;}}

Define an annotation

Target (ElementType.TYPE) @ Retention (RetentionPolicy.RUNTIME) public @ interface CRSEventAnnotation {CRSEvent value ();}

Define event handling interface

Public interface EventProcess {CRSResponse execute (CRSRequest resquest);}

All time processing classes implement this interface. Where execute is the event handling method

Write specific time processing classes

Next, write event handling classes one by one, giving the following example:

@ 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 ("120s"); response.setMessage (message); return response;}}

Define SpringContext utility classes

@ Componentpublic class SpringContextUtil implements ApplicationContextAware {private ApplicationContext context; public ApplicationContext getContext () {return context;} @ Override public void setApplicationContext (ApplicationContext applicationContext) throws BeansException {this.context = applicationContext;}}

Define event handling class factories, which are used to produce various event handling objects

@ Componentpublic class EventProcessFactory {@ Autowired SpringContextUtil contextUtil; private static Map eventProcessMap = 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);}}

Calling code modification

CRSEvent crsEvent = CRSEvent.valueOf (crsRequest.getEvent ()); EventProcess eventProcess = EventProcessFactory.createEventProcess (crsEvent); if (eventProcess! = null) {return eventProcess.execute (crsRequest);} return null

In this way, the code has no switch-case, and it's easy to add an event, just implement the EventProcess interface.

At this point, the study of "how to eliminate switch-case in Springboot" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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