封装常见的异常处理逻辑

Question

我有一系列的Web服务方法调用,都遵循以下格式.每种方法的唯一区别是httpRequest.methodName().任何人都可以想到我可以封装共同逻辑的方法吗？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抽象类中,并将其更改为调用抽象方法(例如,将其命名为进程):

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);
   }
 }

然后让每个服务扩展该类并process根据需要实现该方法

class OneService extends BaseWebService {

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

对于记录,这是模板方法模式