Alter property of an object used inside the called method in Java












0














I have a java, spring web application using maven as build mechanism. Consider the following code (over-simplified version of my situation) where a controller calls a service to perform some operation and it turn calls some DAO methods to perform some actions in DB.



class MyController extends Controller {
public ModelAndView handleRequest(... request) {
boolean performCheck = Boolean.valueOf(request.getParameter("doCheck"));
myService.doSomeAction(object)
return ...;
}
}

class MyService {
public void doSomeAction(Object o){
myDao.doSomething(o);
}
}

class MyDao exterds HibernateDaoSuppot {
boolean check;

public void doSomething(Object o){
if(check == true){
// some action
} else {
// some other action
}

}
}


My question is how can I alter the value of the check boolean in the Dao method, based on the value I receive in the controller without explicitly passing the boolean through all the layers? I work with a legacy code with lot of business logics and the business team is not confident of making too many modifications to the existing code. However I am free to add any no of classes or aspects to perform the same.



I have tried reading the call stack in the DAO method and determine the boolean several layers above, but I do not feel good about working with the call stack and I am afraid that some future changes in the app architecture or JVM changes can mess up the call stack.










share|improve this question






















  • Not sure why you need to change value of singleton class field from RestController. This can result in unidentified bugs.
    – Sukhpal Singh
    Nov 14 '18 at 10:26










  • @SukhpalSingh Yes, your are right. But I do not have any other option to perform two different actions in DAO layer. As I said, this is a code that I have not written, but I am asked to implement this check without any major code changes
    – Sathish
    Nov 14 '18 at 10:59










  • If check variable is introduced by you, then create a new object of type CheckObject (please name something better) and use that from your controller layer. Then you can check using instanceof.
    – Sukhpal Singh
    Nov 14 '18 at 11:38
















0














I have a java, spring web application using maven as build mechanism. Consider the following code (over-simplified version of my situation) where a controller calls a service to perform some operation and it turn calls some DAO methods to perform some actions in DB.



class MyController extends Controller {
public ModelAndView handleRequest(... request) {
boolean performCheck = Boolean.valueOf(request.getParameter("doCheck"));
myService.doSomeAction(object)
return ...;
}
}

class MyService {
public void doSomeAction(Object o){
myDao.doSomething(o);
}
}

class MyDao exterds HibernateDaoSuppot {
boolean check;

public void doSomething(Object o){
if(check == true){
// some action
} else {
// some other action
}

}
}


My question is how can I alter the value of the check boolean in the Dao method, based on the value I receive in the controller without explicitly passing the boolean through all the layers? I work with a legacy code with lot of business logics and the business team is not confident of making too many modifications to the existing code. However I am free to add any no of classes or aspects to perform the same.



I have tried reading the call stack in the DAO method and determine the boolean several layers above, but I do not feel good about working with the call stack and I am afraid that some future changes in the app architecture or JVM changes can mess up the call stack.










share|improve this question






















  • Not sure why you need to change value of singleton class field from RestController. This can result in unidentified bugs.
    – Sukhpal Singh
    Nov 14 '18 at 10:26










  • @SukhpalSingh Yes, your are right. But I do not have any other option to perform two different actions in DAO layer. As I said, this is a code that I have not written, but I am asked to implement this check without any major code changes
    – Sathish
    Nov 14 '18 at 10:59










  • If check variable is introduced by you, then create a new object of type CheckObject (please name something better) and use that from your controller layer. Then you can check using instanceof.
    – Sukhpal Singh
    Nov 14 '18 at 11:38














0












0








0







I have a java, spring web application using maven as build mechanism. Consider the following code (over-simplified version of my situation) where a controller calls a service to perform some operation and it turn calls some DAO methods to perform some actions in DB.



class MyController extends Controller {
public ModelAndView handleRequest(... request) {
boolean performCheck = Boolean.valueOf(request.getParameter("doCheck"));
myService.doSomeAction(object)
return ...;
}
}

class MyService {
public void doSomeAction(Object o){
myDao.doSomething(o);
}
}

class MyDao exterds HibernateDaoSuppot {
boolean check;

public void doSomething(Object o){
if(check == true){
// some action
} else {
// some other action
}

}
}


My question is how can I alter the value of the check boolean in the Dao method, based on the value I receive in the controller without explicitly passing the boolean through all the layers? I work with a legacy code with lot of business logics and the business team is not confident of making too many modifications to the existing code. However I am free to add any no of classes or aspects to perform the same.



I have tried reading the call stack in the DAO method and determine the boolean several layers above, but I do not feel good about working with the call stack and I am afraid that some future changes in the app architecture or JVM changes can mess up the call stack.










share|improve this question













I have a java, spring web application using maven as build mechanism. Consider the following code (over-simplified version of my situation) where a controller calls a service to perform some operation and it turn calls some DAO methods to perform some actions in DB.



class MyController extends Controller {
public ModelAndView handleRequest(... request) {
boolean performCheck = Boolean.valueOf(request.getParameter("doCheck"));
myService.doSomeAction(object)
return ...;
}
}

class MyService {
public void doSomeAction(Object o){
myDao.doSomething(o);
}
}

class MyDao exterds HibernateDaoSuppot {
boolean check;

public void doSomething(Object o){
if(check == true){
// some action
} else {
// some other action
}

}
}


My question is how can I alter the value of the check boolean in the Dao method, based on the value I receive in the controller without explicitly passing the boolean through all the layers? I work with a legacy code with lot of business logics and the business team is not confident of making too many modifications to the existing code. However I am free to add any no of classes or aspects to perform the same.



I have tried reading the call stack in the DAO method and determine the boolean several layers above, but I do not feel good about working with the call stack and I am afraid that some future changes in the app architecture or JVM changes can mess up the call stack.







java spring hibernate reflection aop






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share|improve this question











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share|improve this question










asked Nov 14 '18 at 10:09









Sathish

5629




5629












  • Not sure why you need to change value of singleton class field from RestController. This can result in unidentified bugs.
    – Sukhpal Singh
    Nov 14 '18 at 10:26










  • @SukhpalSingh Yes, your are right. But I do not have any other option to perform two different actions in DAO layer. As I said, this is a code that I have not written, but I am asked to implement this check without any major code changes
    – Sathish
    Nov 14 '18 at 10:59










  • If check variable is introduced by you, then create a new object of type CheckObject (please name something better) and use that from your controller layer. Then you can check using instanceof.
    – Sukhpal Singh
    Nov 14 '18 at 11:38


















  • Not sure why you need to change value of singleton class field from RestController. This can result in unidentified bugs.
    – Sukhpal Singh
    Nov 14 '18 at 10:26










  • @SukhpalSingh Yes, your are right. But I do not have any other option to perform two different actions in DAO layer. As I said, this is a code that I have not written, but I am asked to implement this check without any major code changes
    – Sathish
    Nov 14 '18 at 10:59










  • If check variable is introduced by you, then create a new object of type CheckObject (please name something better) and use that from your controller layer. Then you can check using instanceof.
    – Sukhpal Singh
    Nov 14 '18 at 11:38
















Not sure why you need to change value of singleton class field from RestController. This can result in unidentified bugs.
– Sukhpal Singh
Nov 14 '18 at 10:26




Not sure why you need to change value of singleton class field from RestController. This can result in unidentified bugs.
– Sukhpal Singh
Nov 14 '18 at 10:26












@SukhpalSingh Yes, your are right. But I do not have any other option to perform two different actions in DAO layer. As I said, this is a code that I have not written, but I am asked to implement this check without any major code changes
– Sathish
Nov 14 '18 at 10:59




@SukhpalSingh Yes, your are right. But I do not have any other option to perform two different actions in DAO layer. As I said, this is a code that I have not written, but I am asked to implement this check without any major code changes
– Sathish
Nov 14 '18 at 10:59












If check variable is introduced by you, then create a new object of type CheckObject (please name something better) and use that from your controller layer. Then you can check using instanceof.
– Sukhpal Singh
Nov 14 '18 at 11:38




If check variable is introduced by you, then create a new object of type CheckObject (please name something better) and use that from your controller layer. Then you can check using instanceof.
– Sukhpal Singh
Nov 14 '18 at 11:38












4 Answers
4






active

oldest

votes


















1














Of course the best is to pass the boolean variable. but instead; you can declare two functions, one for perfromCheck == true and another one for performCheck == false and call either from the controller based on the value of performCheck.






share|improve this answer





























    1














    You can add a transient(transient only if object is a persistent object) boolean field in your object.



    Set the value of the boolean in your controller before passing the object to your service.
    You wont even need to maintain a separate check variable in your DAO layer.



    Your controller might look like:



    class MyController extends Controller {
    public ModelAndView handleRequest(... request) {
    object.setPerform(Boolean.valueOf(request.getParameter("doCheck"))); // object has a boolean field named 'perform'
    myService.doSomeAction(object)
    return ...;
    }
    }


    Your MyDao might look like:



    class MyDao exterds HibernateDaoSuppot {
    //boolean check; wont need this

    public void doSomething(Object o){
    if(o.getPerform() == true){
    // some action
    } else {
    // some other action
    }
    }
    }





    share|improve this answer





























      1














      As your case: "check" is property of MyDao, you want change it dynamically from a method scope, this may cause Concurrent issues if you use single instance, that's not recommend.



      As mentioned by above user, you can use two MyDao instance in your app, one declare with True and the other with False, and your controller determine which one to use.






      share|improve this answer





























        0














        You could make the boolean in the controller as a private class attribute and then use a getter to access its value from Dao.






        share|improve this answer





















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          4 Answers
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          4 Answers
          4






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          active

          oldest

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          1














          Of course the best is to pass the boolean variable. but instead; you can declare two functions, one for perfromCheck == true and another one for performCheck == false and call either from the controller based on the value of performCheck.






          share|improve this answer


























            1














            Of course the best is to pass the boolean variable. but instead; you can declare two functions, one for perfromCheck == true and another one for performCheck == false and call either from the controller based on the value of performCheck.






            share|improve this answer
























              1












              1








              1






              Of course the best is to pass the boolean variable. but instead; you can declare two functions, one for perfromCheck == true and another one for performCheck == false and call either from the controller based on the value of performCheck.






              share|improve this answer












              Of course the best is to pass the boolean variable. but instead; you can declare two functions, one for perfromCheck == true and another one for performCheck == false and call either from the controller based on the value of performCheck.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered Nov 14 '18 at 10:18









              Muhammad Moustafa

              212




              212

























                  1














                  You can add a transient(transient only if object is a persistent object) boolean field in your object.



                  Set the value of the boolean in your controller before passing the object to your service.
                  You wont even need to maintain a separate check variable in your DAO layer.



                  Your controller might look like:



                  class MyController extends Controller {
                  public ModelAndView handleRequest(... request) {
                  object.setPerform(Boolean.valueOf(request.getParameter("doCheck"))); // object has a boolean field named 'perform'
                  myService.doSomeAction(object)
                  return ...;
                  }
                  }


                  Your MyDao might look like:



                  class MyDao exterds HibernateDaoSuppot {
                  //boolean check; wont need this

                  public void doSomething(Object o){
                  if(o.getPerform() == true){
                  // some action
                  } else {
                  // some other action
                  }
                  }
                  }





                  share|improve this answer


























                    1














                    You can add a transient(transient only if object is a persistent object) boolean field in your object.



                    Set the value of the boolean in your controller before passing the object to your service.
                    You wont even need to maintain a separate check variable in your DAO layer.



                    Your controller might look like:



                    class MyController extends Controller {
                    public ModelAndView handleRequest(... request) {
                    object.setPerform(Boolean.valueOf(request.getParameter("doCheck"))); // object has a boolean field named 'perform'
                    myService.doSomeAction(object)
                    return ...;
                    }
                    }


                    Your MyDao might look like:



                    class MyDao exterds HibernateDaoSuppot {
                    //boolean check; wont need this

                    public void doSomething(Object o){
                    if(o.getPerform() == true){
                    // some action
                    } else {
                    // some other action
                    }
                    }
                    }





                    share|improve this answer
























                      1












                      1








                      1






                      You can add a transient(transient only if object is a persistent object) boolean field in your object.



                      Set the value of the boolean in your controller before passing the object to your service.
                      You wont even need to maintain a separate check variable in your DAO layer.



                      Your controller might look like:



                      class MyController extends Controller {
                      public ModelAndView handleRequest(... request) {
                      object.setPerform(Boolean.valueOf(request.getParameter("doCheck"))); // object has a boolean field named 'perform'
                      myService.doSomeAction(object)
                      return ...;
                      }
                      }


                      Your MyDao might look like:



                      class MyDao exterds HibernateDaoSuppot {
                      //boolean check; wont need this

                      public void doSomething(Object o){
                      if(o.getPerform() == true){
                      // some action
                      } else {
                      // some other action
                      }
                      }
                      }





                      share|improve this answer












                      You can add a transient(transient only if object is a persistent object) boolean field in your object.



                      Set the value of the boolean in your controller before passing the object to your service.
                      You wont even need to maintain a separate check variable in your DAO layer.



                      Your controller might look like:



                      class MyController extends Controller {
                      public ModelAndView handleRequest(... request) {
                      object.setPerform(Boolean.valueOf(request.getParameter("doCheck"))); // object has a boolean field named 'perform'
                      myService.doSomeAction(object)
                      return ...;
                      }
                      }


                      Your MyDao might look like:



                      class MyDao exterds HibernateDaoSuppot {
                      //boolean check; wont need this

                      public void doSomething(Object o){
                      if(o.getPerform() == true){
                      // some action
                      } else {
                      // some other action
                      }
                      }
                      }






                      share|improve this answer












                      share|improve this answer



                      share|improve this answer










                      answered Nov 14 '18 at 10:23









                      abj1305

                      17510




                      17510























                          1














                          As your case: "check" is property of MyDao, you want change it dynamically from a method scope, this may cause Concurrent issues if you use single instance, that's not recommend.



                          As mentioned by above user, you can use two MyDao instance in your app, one declare with True and the other with False, and your controller determine which one to use.






                          share|improve this answer


























                            1














                            As your case: "check" is property of MyDao, you want change it dynamically from a method scope, this may cause Concurrent issues if you use single instance, that's not recommend.



                            As mentioned by above user, you can use two MyDao instance in your app, one declare with True and the other with False, and your controller determine which one to use.






                            share|improve this answer
























                              1












                              1








                              1






                              As your case: "check" is property of MyDao, you want change it dynamically from a method scope, this may cause Concurrent issues if you use single instance, that's not recommend.



                              As mentioned by above user, you can use two MyDao instance in your app, one declare with True and the other with False, and your controller determine which one to use.






                              share|improve this answer












                              As your case: "check" is property of MyDao, you want change it dynamically from a method scope, this may cause Concurrent issues if you use single instance, that's not recommend.



                              As mentioned by above user, you can use two MyDao instance in your app, one declare with True and the other with False, and your controller determine which one to use.







                              share|improve this answer












                              share|improve this answer



                              share|improve this answer










                              answered Nov 14 '18 at 10:40









                              Moon.Hou

                              307




                              307























                                  0














                                  You could make the boolean in the controller as a private class attribute and then use a getter to access its value from Dao.






                                  share|improve this answer


























                                    0














                                    You could make the boolean in the controller as a private class attribute and then use a getter to access its value from Dao.






                                    share|improve this answer
























                                      0












                                      0








                                      0






                                      You could make the boolean in the controller as a private class attribute and then use a getter to access its value from Dao.






                                      share|improve this answer












                                      You could make the boolean in the controller as a private class attribute and then use a getter to access its value from Dao.







                                      share|improve this answer












                                      share|improve this answer



                                      share|improve this answer










                                      answered Nov 14 '18 at 10:21







                                      user10651229





































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