我想制作一個包裝類，它進行預處理，執行傳遞的函式，然后在回傳回應之前進行一些后處理。我如何撰寫包裝類來接受函式作為引數并呼叫它？
@Autowired
private SomeService service;
@GetMapping("/path")
public CustomResponse(CustomRequest request){
1. preprocess(request)
2. CustomResponse response = service.functionA(request)
3. postprocess(response)
4. return response;
------------------------- vs --------------------------------
1. return CustomWrapper.execute(request,???,response)
}
-- **Need help in writing this class.**
class CustomWrapper{
void preprocess();
?? execute();
void postprocess();
}
uj5u.com熱心網友回復：
這基本上應該是您正在尋找的，如果您愿意，您可以對后處理器和前處理器進行硬編碼，以便可以像您的示例一樣使用它，但這更通用：
public class CustomProcessor {
private Function<CustomRequest, CustomRequest> preprocessor;
private Function<CustomResponse, ResponseEntity<CustomResponse>> postprocessor;
public CustomProcessor(
Function<CustomRequest, CustomRequest> preprocessor,
Function<CustomResponse, ResponseEntity<CustomResponse>> postprocessor
) {
this.preprocessor = preprocessor;
this.postprocessor = postprocessor;
}
public ResponseEntity<CustomResponse> execute(CustomRequest request, Function<CustomRequest, CustomResponse> processor) {
request = preprocessor.apply(request);
CustomResponse response = processor.apply(request);
return postprocessor.apply(response);
}
}
uj5u.com熱心網友回復：
在@void void 的幫助下，答案能夠按要求實作。
public class ControllerTemplate<Req, Res> {
private static final Logger logger = LogManager.getLogger(ControllerTemplate.class);
public Res execute(Req req, Function<Req, Res> processor) {
preProcess(req);
Res res = processor.apply(req);
postProcess(res);
return res;
}
private void postProcess(Res res) {
logger.info("response body: {}", res);
}
private void preProcess(Req req) {
logger.info("request body: {}", req);
}
}
呼叫函式
@GetMapping("/logLevel")
public String updateLogLevel(@RequestParam String level) {
return new ControllerTemplate<String, String>()
.execute(level, req -> log4jService.changeLogLevel(req));
}
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