Question

我试图找出一种设计模式，以使用（如果有的话）一种情况，在这种情况下，我将跨一堆类重新做一些功能。以下是我面临的问题的（简化）概述：

我有一些Java代码可以创建，更新，删除Student对象，Professor对象和Staff对象。每次创建，删除或更新这样的对象时，我都希望提取有关受影响对象的一些信息（例如名称，年龄，ID）并通知外部服务。像这样：

class StudentDAO {
   public Student createStudent(Student studentToCreate) {
       jdbcTemplate.update(INSERT_SQL, .....);
       //===> extract some info of the student
       //let external service know a student was created....
   }
   public Student deleteStudent(Student studentToDelete) {
       jdbcTemplate.update(DELETE_SQL, .....);
       //===> extract some info of the student
       //let external service know a student was deleted....
   }
   //same thing for update
}

class ProfessortDAO {
   public Professor createProfessor(Professor professorToCreate) {
       jdbcTemplate.update(INSERT_SQL, .....);
       //===> extract some info of the professor
       //let external service know a Professor was created....
   }
   public Student deleteProfessor(Professor professorToDelete) {
       jdbcTemplate.update(DELETE_SQL, .....);
       //===> extract some info of the professor
       //let external service know a professor was deleted....
   }
   //same thing for update
}

//repeat for Staff

该示例有些虚构，但假设Student，Professor，Staff不共享任何公共超类型。有没有一种方法可以实现此功能，而无需复制和粘贴提取信息的逻辑并将其发送到CREATE，DELETE，UPDATE方法的所有DAO类中？

Answer 1

创建ReportExternalService接口并添加键属性，如果需要通知对象，请实现此接口。

创建一个使用参数作为ReportExternalService的方法，并使用键向外部服务报告！！

Answer 2

您可以使用面向方面的编程。然后，您可以编写一个通用的切入点，该切入点与要与外部服务器进行通讯的所有方法匹配。 What is aspect-oriented programming?

Answer 3

没有太多信息要继续，但是您是否考虑过将RAO <- readr::read_csv(file = "RateAddOnsExcel.csv") RAO$...4 <- NULL RAO$...5 <- NULL RAO$Quarter. <- NULL names(RAO)[1:13] = c("ProviderName","AIMNumber", "ChainName", "RateEffectiveDate", "ComponentTotal", "VentAddOn", "QualityAddOn", "SpecialCareUnitAddOn", "AssessmentAddOn", "SelectedExpenditureAddOn", "RateReduction", "CaseMixRate", "CaseMixAssessment") RAO$AIMNumber <- NULL RAO$ChainName <- NULL names(RAO)[1:13] = c("ProviderName","AIMNumber", "ChainName", "RateEffectiveDate", "ComponentTotal", "VentAddOn", "QualityAddOn", "SpecialCareUnitAddOn", "AssessmentAddOn", "SelectedExpenditureAddOn", "RateReduction", "CaseMixRate", "CaseMixAssessment") RAO <- RAO[-which(apply(RAO, 1, function(x)all(is.na(x)))),] View(RAO) remove.list <- paste(c("Myers", "Provider", "NA", "JJ"), collapse = '|') RAO %>% filter(!grepl(remove.list, RAO$ProviderName)) RAO %>% filter(!str_detect(RAO$ProviderName, remove.list))用于特定类型并实现generics来定义要从每种类型的个人访问的公共信息interface ？

您还应该能够将操作(phone, name, id)作为参数传递。我建议为此使用(DELETE, ADD, UPDATE)。

Answer 4

您应该搜索通用存储库。您可以在此处了解更多信息：

https://www.youtube.com/results?search_query=generic+repository+java

示例代码：

git add commondoc.txt
git commit -m 'Add commondoc.txt symlink from my-common-repo'

当您想将某些通用功能应用于某些特定方法时使用的设计模式？

4 个答案: