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0

Observer by definition is just an observer/update mechanism and if user interacts with model, it leads to MVC pattern but can a model ask observer to get input?

From implementation point of view, it works well and the model waits for input from the user but would this be a bit of violation of observer pattern (which is generally one way)?

Alternatively, I will have to handle the case when the observer needs input in a view and make the method in model not ask for user input.

model-view-controller design-patterns observer-pattern

share|improve this question

asked Mar 23 at 13:06

zarzar

4,836757107

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ...but can a model ask observer to get input? the model could ask the observer for input if the observer does not delegate the call for input to the observable. A decoupled solution could be to have the observer retrieve information from the observable when it is notified about changes and store those information in a context accessible to the model (e.g. have a context using a ThreadLocal to store information, an observer writing the information in the context and the model reading the information from the context)
  
  – Valentin Carnu
  Apr 3 at 11:50
  
  

  
  
  
  

add a comment | 

0

Observer by definition is just an observer/update mechanism and if user interacts with model, it leads to MVC pattern but can a model ask observer to get input?

From implementation point of view, it works well and the model waits for input from the user but would this be a bit of violation of observer pattern (which is generally one way)?

Alternatively, I will have to handle the case when the observer needs input in a view and make the method in model not ask for user input.

model-view-controller design-patterns observer-pattern

share|improve this question

asked Mar 23 at 13:06

zarzar

4,836757107

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ...but can a model ask observer to get input? the model could ask the observer for input if the observer does not delegate the call for input to the observable. A decoupled solution could be to have the observer retrieve information from the observable when it is notified about changes and store those information in a context accessible to the model (e.g. have a context using a ThreadLocal to store information, an observer writing the information in the context and the model reading the information from the context)
  
  – Valentin Carnu
  Apr 3 at 11:50
  
  

  
  
  
  

add a comment | 

Observer by definition is just an observer/update mechanism and if user interacts with model, it leads to MVC pattern but can a model ask observer to get input?

From implementation point of view, it works well and the model waits for input from the user but would this be a bit of violation of observer pattern (which is generally one way)?

Alternatively, I will have to handle the case when the observer needs input in a view and make the method in model not ask for user input.

model-view-controller design-patterns observer-pattern

share|improve this question

asked Mar 23 at 13:06

zarzar

4,836757107

share|improve this question

asked Mar 23 at 13:06

zarzar

4,836757107

share|improve this question

asked Mar 23 at 13:06

zarzar

4,836757107

asked Mar 23 at 13:06

zarzar

4,836757107

asked Mar 23 at 13:06

zarzar

4,836757107