“Chain of Responsibility” is a behavioral design pattern that allows you to route requests through a chain of handlers. When a request arrives, each handler determines whether to process it or forward it to the next handler in the chain.” From Guru’s refactoring.”Chain of Responsibility” is a behavioral design pattern that allows you to route requests through a chain of handlers. When a request arrives, each handler determines whether to process it or forward it to the next handler in the chain.”
Example
Imagine that you have several processes to carry out and that share common components, but they must follow sequential steps and share the resulting data.
- All processes first validate users and tokens. If correct, continue
- All processes validate a photograph parameter.
- Data must be passed between processes.
The main idea is to create an example of a chain of responsibility.
Step 1. Create a folder “Chain” and four classes.
Handle Base is the reasoning behind an abstract class. Serve as a base for the other handlers. The SetNext method is used to provide the next handler in the chain.
IHandler is an implementation of the Handle base.
HandleFactory: In this class, we generate several chain handlers and implement the methods required to work.
Processor. In this class, we work with chain setup, and the dictionary _handlerchains stores the various handlers in the app.
Step 2. Create folder “Classes”
in this folder are the different classes of project;Â RequestBase for initial validation, DataReniec is an example of getting data from an external site, requestPic for validating pictures
Step 3. The ExampleBase.
In this folder, the class ProcessRequest is used to set the class for use in handlers, the data to share between handlers, and the state of handlers.
Step 4. Functions.
in this folder, I put some classes in order to simulate more complex elements for the chains, make validations, and simulate internal data result
Step 5. Handlers.
In this folder, I did every handler extend for the abstract class handler base, validated data, and set handler result and data handler result consuming in the next handler example.
Last Step
For the program, in this example, I set up the request for “ProcessSavePicReniec”, set the initial data, and executed the program.
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