java - 封装常见的异常处理逻辑

Question

我有一系列网络服务方法调用，它们都遵循以下格式。每种方法的唯一区别是 httpRequest.methodName()。任何人都可以想出一种方法来封装通用逻辑吗？另请注意，我的环境是 J2ME。

public Response webserviceCall(Request request) {

    HTTPRequest httpRequest = new HTTPRequest(new ConnectionProperties());

    String errorMessage = "";
    String errorCode = "";

    try {
        // the only thing different
        httpRequest.methodName();
    } catch (SDKException e) {
        errorMessage = e.getMessage();
        errorCode = e.getErrorCode();
    }

    Error error = new Error(errorMessage,errorCode);

    return new Response(error);
}

Answer 1

一种替代方法是将该代码放在一个抽象类中，并将其更改为调用一个抽象方法(例如，将其命名为 process):

abstract class BaseWebService {
   public abstract Response process(HTTPRequest request) throws SDKException;

   public Response webserviceCall(Request request) {

       HTTPRequest httpRequest = new HTTPRequest(new ConnectionProperties());

       String errorMessage = "";
       String errorCode = "";

       try {
           process(httpRequest);
       } catch (SDKException e) {
           errorMessage = e.getMessage();
           errorCode = e.getErrorCode();
       }

       Error error = new Error(errorMessage,errorCode);

       return new Response(error);
   }
 }

然后使您的每个服务都扩展该类并根据需要实现process 方法

class OneService extends BaseWebService {

   Response process(HTTPRequest request) throws SDKException{
        return request.methodName();
   } 
}

根据记录，这是 Template Method Pattern