chain-of-responsibility

问题 This is more of an architecture/best practices question than anything else, so please feel free to add your two cents. I know i stated status in the title, but this goes for any basic property of an object. I think the account example below will help demonstrate my question a little better than status. Here is a sample Account object: public class Account { private IList<Transaction> _transactions; public AddTransaction(trans as Transaction) { _transaction.add(trans) } } Now lets say I want

问题 This answer almost describes the first half of the question. It says: After reading the Gang of Four definitions, I'm not convinced there's a real difference. (included for convenience) Decorator: Allows for the dynamic wrapping of objects in order to modify their existing responsibilities and behaviours Chain of Responsibility: Gives more than one object an opportunity to handle a request by linking receiving objects together Wikipedia fleshes them out a little, but some of it's kinda

问题 I'm trying to implement the Chain of Responsibility design pattern in Rust: pub trait Policeman<'a> { fn set_next(&'a mut self, next: &'a Policeman<'a>); } pub struct Officer<'a> { deduction: u8, next: Option<&'a Policeman<'a>>, } impl<'a> Officer<'a> { pub fn new(deduction: u8) -> Officer<'a> { Officer {deduction, next: None} } } impl<'a> Policeman<'a> for Officer<'a> { fn set_next(&'a mut self, next: &'a Policeman<'a>) { self.next = Some(next); } } fn main() { let vincent = Officer::new(8);

问题 I'm trying to implement the Chain of Responsibility design pattern in Rust: pub trait Policeman<'a> { fn set_next(&'a mut self, next: &'a Policeman<'a>); } pub struct Officer<'a> { deduction: u8, next: Option<&'a Policeman<'a>>, } impl<'a> Officer<'a> { pub fn new(deduction: u8) -> Officer<'a> { Officer {deduction, next: None} } } impl<'a> Policeman<'a> for Officer<'a> { fn set_next(&'a mut self, next: &'a Policeman<'a>) { self.next = Some(next); } } fn main() { let vincent = Officer::new(8);

问题 For my understanding purpose i have implemented Chain-Of-Responsibility pattern. //Abstract Base Type public abstract class CustomerServiceDesk { protected CustomerServiceDesk _nextHandler; public abstract void ServeCustomers(Customer _customer); public void SetupHadler(CustomerServiceDesk _nextHandler) { this._nextHandler = _nextHandler; } } public class FrontLineServiceDesk:CustomerServiceDesk { public override void ServeCustomers(Customer _customer) { if (_customer.ComplaintType ==

问题 Recently, I was discussing with another programmer the best way to refactor a huge(1000 lines) method full of "if" statements. The code is written in Java, but I guess this issue could happen in other languages such as C# as well. To solve this problem, he suggested using a chain-of-responsibility pattern. He proposed having a base "Handler" class. Then, "Handler1", "Handler2", etc. would extend "Handler". Then, handlers would have a "getSuccessor" method, which would either return null(if it

问题 Could somebody provide a simple explanation of the chain of responsibility pattern? I found the wiki article a bit confusing. 回答1: A very good example are java servlet filters - pieces of code that are executed before the HTTP request arrives at its target. the chain contains multiple instances, and each of them performs a different action each instance in the chain can choose to propagate to the next instance, or stop the flow So, with servlet filters, you can have a filter that checks if

问题 I saw a tutorial video explain the chain of responsibility design pattern, and I think I understand how it works but I'm not sure when I would really use it. What are some common usages of the chain of responsibility? 回答1: From the GoF: Known Uses Several class libraries use the Chain of Responsibility pattern to handle user events. They use different names for the Handler class, but the idea is the same: When the user clicks the mouse or presses a key, an event gets generated and passed

问题 In ASP.NET Web Apps , events are fired in particluar order : for simplicity Load => validation =>postback =>rendering Suppose I want to develop such pipeline -styled event Example : Event 1 [ "Audiance are gathering" ,Guys{ Event 2 and Event 3 Please wait until i signal }] after Event 1 finished it task Event 2 [ { Event 2, Event 3 "Audiance gathered! My task is over } ] Event 2 is taking over the control to perform its task Event 2 [ " Audiance are Logging in " Event 3 please wait until i

问题 Consider you got several validations. Those validations should only take effect if the object to be inspected is of a certain type. Why would I use a chain of responsibility over a switch-statement? Example with chain of responsibility public class Executor { @Inject private ValidatorFactory validatorFactory; public void execute(Konfiguration konfig) { List<Statement> statements = konfig.getStatements(); AbstractValidator validator = validatorFactory.create(); for (Statement statement :