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Oct 31, 2024 am 06:46 AM

Understanding the Chain of Responsibility Design Pattern in Backend Development

?? ??(CoR) ??? ??? ??? ??? ?? ???? ? ?? ??? ?? ?????. ? ??? ???? ??? ??? ?? ??? ??? ? ???, ? ???? ??? ????? ?? ???? ??? ? ????. ? ?????? ??? ???? CoR ??? ???????. ?? ??? Java? ???? ? ???? ?? ?? ? ??? ???? CoR ??? ??? ???.

?? ?? ??? ???? ?? ??

?? ?? ??? ??? ???? ?? ?? ?? ? ?? ??? ??? ? ?? ??? ???? ?? ?????. ?? ?? RESTful API?? ???? ??? ?? ???? ??? ?? ???? ?? ??, ?? ?? ? ??? ???? ?? ???? ???? ? ? ????. ??? ? ??? ??? ??? ???? ?? ??? ? ???? ??? ?? ??? ???? ??? ? ????. ? ??? ??? ???? ?? ??? ??? ???? ?? ??? ?? ??? ??? ???? ?? ???? ?????? ?????.

?? ?? ??? ??

CoR ??? ???, ???? ???, ??????? ? ?? ?? ????? ?????. Handler? ?? ??? ?? ?????? ???? ??? ?? ???? ?? ??? ?????. ? ??? ???? ?? ??? ?? ??? ?? ??? ???? ??? ???? ??? ?? ???? ???? ?????. ?????? ??? ??? ??? ??? ????? ?? ???? ??? ???? ?? ????. ??? ??? ??? ???? ?? ???? ???? ??????.

Java??? ?? ?

1??: ??? ????? ??

?? ?? ???? ???? ??? ???? ?? ???? ??? RequestHandler ?????? ?????.

abstract class RequestHandler {
    protected RequestHandler nextHandler;

    public void setNext(RequestHandler nextHandler) {
        this.nextHandler = nextHandler;
    }

    public void handleRequest(Request request) {
        if (nextHandler != null) {
            nextHandler.handleRequest(request);
        }
    }
}

2??: ???? ??? ??

????, RequestHandler ???? ???? ???? ??? ???? ???????. ? ???? ?? ??? ?? ??? ?????.

class AuthenticationHandler extends RequestHandler {
    @Override
    public void handleRequest(Request request) {
        if (request.isAuthenticated()) {
            System.out.println("Authentication successful.");
            super.handleRequest(request);
        } else {
            System.out.println("Authentication failed.");
            request.setValid(false);
        }
    }
}

class AuthorizationHandler extends RequestHandler {
    @Override
    public void handleRequest(Request request) {
        if (request.isAuthorized()) {
            System.out.println("Authorization successful.");
            super.handleRequest(request);
        } else {
            System.out.println("Authorization failed.");
            request.setValid(false);
        }
    }
}

class DataValidationHandler extends RequestHandler {
    @Override
    public void handleRequest(Request request) {
        if (request.isDataValid()) {
            System.out.println("Data validation successful.");
            super.handleRequest(request);
        } else {
            System.out.println("Data validation failed.");
            request.setValid(false);
        }
    }
}

class BusinessLogicHandler extends RequestHandler {
    @Override
    public void handleRequest(Request request) {
        if (request.isValid()) {
            System.out.println("Processing business logic...");
            // Perform the main business logic here
        } else {
            System.out.println("Request is invalid. Cannot process business logic.");
        }
    }
}

3??: ?? ??

?? ??? ?? ??? ??? ???????.

public class RequestProcessor {
    private RequestHandler chain;

    public RequestProcessor() {
        // Create handlers
        RequestHandler authHandler = new AuthenticationHandler();
        RequestHandler authzHandler = new AuthorizationHandler();
        RequestHandler validationHandler = new DataValidationHandler();
        RequestHandler logicHandler = new BusinessLogicHandler();

        // Set up the chain
        authHandler.setNext(authzHandler);
        authzHandler.setNext(validationHandler);
        validationHandler.setNext(logicHandler);

        this.chain = authHandler; // Start of the chain
    }

    public void processRequest(Request request) {
        chain.handleRequest(request);
    }
}

4??: ????? ??

????? ??? ?? ?? ??? ?? ???? ??? ??? ????.

abstract class RequestHandler {
    protected RequestHandler nextHandler;

    public void setNext(RequestHandler nextHandler) {
        this.nextHandler = nextHandler;
    }

    public void handleRequest(Request request) {
        if (nextHandler != null) {
            nextHandler.handleRequest(request);
        }
    }
}

?? ???

??? ?? ???? ????? ? ??? ??? ?? ??????.

class AuthenticationHandler extends RequestHandler {
    @Override
    public void handleRequest(Request request) {
        if (request.isAuthenticated()) {
            System.out.println("Authentication successful.");
            super.handleRequest(request);
        } else {
            System.out.println("Authentication failed.");
            request.setValid(false);
        }
    }
}

class AuthorizationHandler extends RequestHandler {
    @Override
    public void handleRequest(Request request) {
        if (request.isAuthorized()) {
            System.out.println("Authorization successful.");
            super.handleRequest(request);
        } else {
            System.out.println("Authorization failed.");
            request.setValid(false);
        }
    }
}

class DataValidationHandler extends RequestHandler {
    @Override
    public void handleRequest(Request request) {
        if (request.isDataValid()) {
            System.out.println("Data validation successful.");
            super.handleRequest(request);
        } else {
            System.out.println("Data validation failed.");
            request.setValid(false);
        }
    }
}

class BusinessLogicHandler extends RequestHandler {
    @Override
    public void handleRequest(Request request) {
        if (request.isValid()) {
            System.out.println("Processing business logic...");
            // Perform the main business logic here
        } else {
            System.out.println("Request is invalid. Cannot process business logic.");
        }
    }
}

?? ??

????? ??? ???? ?? ??? ? ? ????.

public class RequestProcessor {
    private RequestHandler chain;

    public RequestProcessor() {
        // Create handlers
        RequestHandler authHandler = new AuthenticationHandler();
        RequestHandler authzHandler = new AuthorizationHandler();
        RequestHandler validationHandler = new DataValidationHandler();
        RequestHandler logicHandler = new BusinessLogicHandler();

        // Set up the chain
        authHandler.setNext(authzHandler);
        authzHandler.setNext(validationHandler);
        validationHandler.setNext(logicHandler);

        this.chain = authHandler; // Start of the chain
    }

    public void processRequest(Request request) {
        chain.handleRequest(request);
    }
}
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  1. ??? ??: ? ????? ??? ??? ???? ??? ? ?? ???? ?? ??? ? ????. ??? ??? ?? ?? ?? ????? ?? ???? ?? ?? ??? ?? ??? ??? ? ????.

  2. ??? ?? ??: ?? ??? ???? ??? ???? ????? ??? ? ???? ??? ?? ???? ???? ?? ??? ?? ??? ? ????. ??? ???? ??? ?? ??? ?????.

  3. ??? ?? ???: ???? ??? ??? ? ???? ?? ??(?: ??? ?? ?? ????)? ?? ???? ??? ?? ?? ???? ??? ??? ??? ?????? ?? ?????.

  4. ? ??? ???: ?? ???? ??? ???? ? ?? ??? ????? ??????. ?? ?? ?? ?? ???? ???? ?? ?? ?? ??? ?? ???? ???? ? ????.

??

  1. ?? ????: ?? ?? ??? ????? ???? ?? ?? ? ??? ???? ?? ?? ??? ??? ? ????. ??? ??? ????????? ??? ??? ? ? ????.

  2. ?? ??? ???: ??? ?? ???? ??? ?????? ?? ??? ?? ??? ???? ?? ? ????. ?? ???? ?? ??? ???? ??? ????? ??? ??? ?? ?? ??? ??? ??? ? ????.

??

?? ?? ??? ?? ??, ??? ? ?? ???? ???? ?? ??? ????? ??? ??? ???? ??? ?????. ?? ?? ? ??? ?? ? ??? ?????? ???? ??? ?? ??? ????? ??? ? ?? ???? ?? ??? ???? ?? ? ????. RESTful API, ???? ?? ?? ?? ??? ???????? CoR ??? ???? ? ??? ??? ??? ???? ??? ??? ? ??? ????? ? ????? ?? ??? ??? ????? ???? ??? ? ????.

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