Chain of Responsibility Design Pattern In NET C#

Table Of Content

• Explore design patterns using Python with code examples to solve common software challenges. …
• Chain of Responsibility Design Pattern - Base Classes and Interface
• Step 2
• Creational Software Design Patterns in C++
• Using the Chain of Responsibility Design Pattern in Java
• Section 3: Request Handling Class and Client Code

This pattern acts as an intermediary, allowing you to decouple the sender of a request from its receivers. The initial receiver object at the beginning of the chain is where senders dispatch their requests. Senders are only aware of this first link in the chain and have no knowledge of subsequent receivers.

Explore design patterns using Python with code examples to solve common software challenges. …

In other words, we can say that normally each receiver contains reference of another receiver. This article also conclude my series of articles on basic design patterns. Based on your response, I will come with more articles on various technologies and languages like C++, Scala, Groovy, Big Data, Database along with Java. I hope this tutorial helps in understanding of the chain of responsibility design pattern.

Chain of Responsibility Design Pattern - Base Classes and Interface

Chain of Responsibility is a behavioral design pattern that lets you pass requests along a chain of handlers. Upon receiving a request, each handler decides either to process the request or to pass it to the next handler in the chain. It promotes loose coupling, making it a valuable addition to your design pattern toolbox when building applications. The Chain of Responsibility design pattern is a behavioral design pattern that allows an object to pass a request along a chain of handlers. Each handler in the chain decides either to process the request or to pass it along the chain to the next handler. As the name suggests, the chain of responsibility pattern creates a chain of receiver objects for a request.

Step 2

The doFilter method of the Filter is called by the container each time a request/response pair is passed through the chain due to a client request for a resource at the end of the chain. The FilterChain passed in to this method allows the Filter to pass on the request and response to the next entity in the chain. With a focus on customer satisfaction, we deliver prompt and effective business solutions tailored to the needs of the industry. In the real world, the JavaScript Chain of Responsibility design pattern can be illustrated through the operation of an ATM (Automated Teller Machine).

If the amount is greater than 1, then we print how many 2000 notes are in the console window. Then we check the remaining amount, and if the remaining is greater than 0, we call the DispatchNote() method of the next handler (NextHandler), i.e., the FiveHundredHandler. From the BasicHandler code, it’s possible to automate the handle method (with some constraints) moving its scope from the children to the parent abstract class. Now, let’s delve into the core concepts and implementation details. Thats all for the Chain of Responsibility design pattern, I hope you liked it and its able to clear your understanding on this design pattern.

Design Patterns

This behavioral pattern enables request clients to submit their requests without needing to know how these requests will be ultimately processed. The Chain of Responsibility pattern can handle multiple requests by passing each request along the chain until it is processed. Each request is handled independently, so multiple requests can be in different stages of processing along the chain at the same time.

Since you’re a geek, the computer has several operating systems installed. You try to boot all of them to see whether the hardware is supported. With a small flicker of hope, you decide to call the tech-support phone number written on the box.

In this chapter, I will explain how to apply Chain of Responsibility Pattern with a real-world example using Java. Assume, there is company that provide a system for employees to request leave, based on several facts. So, the company will consider those facts before approving their leave. For example, those might be number of days, employee tier (level), and reason for the leave. Based on these facts, the leave request will forward to a specific person (leave handler), who can handle those requests.

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Create a class file named EmployeeLeaveHandler.cs and copy and paste the following code. Here, we created one variable, i.e., Supervisor, to hold the next handler instance, and we initialize this variable through the constructor. We also declare one abstract method, i.e., ApplyLeave, which the Concrete handlers will implement. The following example code is self-explained, so please go through the comment lines for a better understanding.

In this case, one receiver can handle the request in the chain, or one or more receivers can handle the request. In this scenario, the Chain of Responsibility design pattern is a design approach that allows each processing step to be treated as a separate handler. The request is passed through this chain of handlers, and each handler has the option to process the request or pass it on to the next handler in the chain. This provides flexibility and modularity, making it easier to add or remove processing steps without affecting the overall request processing flow. In our example, ATM has managed the sequence in which all the handlers will be chained together.

Yes, the Chain of Responsibility pattern can be combined with other design patterns for more complex scenarios. For instance, it can be used with the Composite pattern, which allows you to treat a group of objects in the same way as a single instance of an object. This can be useful when you want to create a tree-like structure and have requests flow through it. The important point to note here is the implementation of dispense method. You will notice that every implementation is trying to process the request and based on the amount, it might process some or full part of it. If one of the chain not able to process it fully, it sends the request to the next processor in chain to process the remaining request.

Chain of responsibility design pattern is one of the behavioral design pattern. According to the scenario, I have created an abstract class named as “LeaveHandler.” Then I have created the “LeaveHandler” object within the class, because the handler should know about its successor. However, in the above scenarios they don’t check the reason for requesting a leave.