I have a large collection of data in an excel file (and csv files). The data needs to be placed into a database (mysql). However, before it goes into the database it needs to be processed..for example if columns 1 is less than column 3 add 4 to column 2. There are quite a few rules that must be followed before the information is persiste...
I have been finding myself using the Chain of Responsibility pattern often (3 times is often for me) in my current project and I'm wondering if I have become a little over-enthusiastic about the solution. Specifically, I have been using the Apache Commons chain project. So, far I have been quite impressed by how it has simplified a numbe...
I have a code that parses some template files and when it finds a placeholder, it replaces it with a value. Something like: <html> <head> <title>%title%</title> </head> <body bgcolor="%color%"> ...etc. In code, the parser finds those, calls this function: string getContent(const string& name) { if (name == "title") re...
I'd like to declare a chain of responsibility using decorators in Ninject. Has anyone done that before? Thanks. ...
I'm just reading up on the Chain of Responsibility pattern and I'm having trouble imagining a scenario when I would prefer its use over that of decorator. What do you think? Does CoR have a niche use? ...
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 "Ha...
I have a persistent object with 7 pertinent fields. The fields can hold the number of values listed here: Field # of Possible Values 1 5 2 20 3 2 4 2 5 19 6 2 7 8 Which is a potential for 121600 unique objects. The code under test is a number of filters that grab a certain number...
Consider the following PHP snippet: <?php class Is { function __get($key) { $class = __CLASS__ . '_' . $key; if (class_exists($class) === true) { return $this->$key = new $class(); } return false; } function Domain($string) { if (preg_match('~^[0-9a-z\-]{1,63}\.[a-z]{2,6}$~i', ...
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, ...
I am trying to allow developers to extend my code at certain points of execution. My specific example is a database transaction wrapper. The wrapper takes care of many details that we wanted to abstract away from the developer and is used on several projects. Each project however has certain things they would like to do automatically ...
do routed events from wpf have something in common with the chain of responsibility pattern ? i googled for this and i don't see anyone talking about this :S, although i though that the routed events are an implementation of that pattern ...
I have been getting more involved with WPF for about a year now. A lot of things are new and sometimes it is hard to get my head wrapped around it. At the same time I am rereading the GOF Design Patterns book. A few times I would stop in the middle because I would realize that a certain pattern is the very one used in some WPF functio...
I have a simple UIView with touchesBegan... implemented, and I process the touches in the view, but I want the viewcontroller to know when a touch occurs. No specific information about the touch is necessary for the viewcontroller. Is there an easy way to do this, and if not, what's the hard way? Thanks in advance for any help. John ...
I'm building a multiprocess architecture that seems to be a strange meld of a pipeline and a chain of responsibility. Essentially, I have a chain of handlers linked up by queues. Each handler will receive an object that represents the input data, forward it to the next handler so that it can start working on it, and then determine if i...
Hello! Can anyone give a practical example of using the design patterns Composite and Chain of Responsibility together? Thanks ...
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._nextHandl...
I have this scenario: I have a chain of query handlers, the first is to query the cache, if the cache can't answer it or the answer is stale, then hit a database, if it can't find the answer or the answer is stale again, then query a remote web service. But I am not sure if this is the right way to use this pattern, since the work flow...
package design.pattern.behavioral; import design.pattern.behavioral.ChainOfResponsibility.*; public class ChainOfResponsibility { public static class Chain { private Request[] requests = null; private Handler[] handlers = null; public Chain(Handler[] handlers, Request[] requests){ this.handlers =...
I'm trying to implement the chain of responsibility pattern in Ruby and ActiveRecord for a polymorphic object. I'm having a few problems. Sometimes I get an error that a method is not defined when I try to alias_method it, I think this is because the class isn't loaded or something so I explicity do a send to get the method I get a bu...
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: ...