Chain of Duty Sample in Java? Instance Tutorial

public interface RequestHandler {
    void handleRequest(Request request);
    void setNext(RequestHandler subsequent);
}

public class ConcreteRequestHandler1 implements RequestHandler {
    personal RequestHandler subsequent;

    @Override
    public void handleRequest(Request request) {
        if (request.getType() == RequestType.TYPE1) {
            
        } else {
            subsequent.handleRequest(request);
        }
    }

    @Override
    public void setNext(RequestHandler subsequent) {
        this.subsequent = subsequent;
    }
}

public class ConcreteRequestHandler2 implements RequestHandler {
    personal RequestHandler subsequent;

    @Override
    public void handleRequest(Request request) {
        if (request.getType() == RequestType.TYPE2) {
            
        } else {
            subsequent.handleRequest(request);
        }
    }

    @Override
    public void setNext(RequestHandler subsequent) {
        this.subsequent = subsequent;
    }
}



RequestHandler handler1 = new ConcreteRequestHandler1();
RequestHandler handler2 = new ConcreteRequestHandler2();
handler1.setNext(handler2);
handler1.handleRequest(new Request(RequestType.TYPE1));
handler1.handleRequest(new Request(RequestType.TYPE2));

2. Chain of Duty Sample utilizing Composition in Java

One other
strategy to implement the Chained or Chain of Duty Sample in Java
is through the use of composition. On this method, every object within the chain has
a reference to the subsequent object within the chain and implements the request
dealing with logic immediately. This method permits for extra flexibility and
reuse, because the objects within the chain could be composed at runtime and could be
shared amongst a number of chains.

ublic class RequestHandler {
    personal RequestHandler subsequent;

    public void handleRequest(Request request) {
        if (canHandleRequest(request)) {
            
        } else if (subsequent != null) {
            subsequent.handleRequest(request);
        }
    }

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

    protected boolean canHandleRequest(Request request) {
        
        return false;
    }
}

public class ConcreteRequestHandler1 extends RequestHandler {
    @Override
    protected boolean canHandleRequest(Request request) {
        return request.getType() == RequestType.TYPE1;
    }
}

public class ConcreteRequestHandler2 extends RequestHandler {
    @Override
    protected boolean canHandleRequest(Request request) {
        return request.getType() == RequestType.TYPE2;
    }
}



RequestHandler handler1 = new ConcreteRequestHandler1();
RequestHandler handler2 = new ConcreteRequestHandler2();
handler1.setNext(handler2);
handler1.handleRequest(new Request(RequestType.TYPE1));
handler1.handleRequest(new Request(RequestType.TYPE2));

In
this instance, the RequestHandler class defines the essential construction of
an object within the chain and supplies the logic for passing the request
alongside the chain. The ConcreteRequestHandler1 and ConcreteRequestHandler2
lessons prolong the RequestHandler class and override the
canHandleRequest() methodology to offer the request dealing with logic for
their respective request sorts.

The objects within the chain are created and
linked collectively utilizing the setNext() methodology, and the request is handed
alongside the chain utilizing the handleRequest() methodology.

3. Benefits and Disadvantages

The
Chained or Chain of Duty Sample has a number of benefits and
disadvantages that needs to be thought-about when deciding whether or not to make use of it
in a venture.

Benefits:

Disadvantages:

Conclusion

The
Chained or Chain of Duty Sample is a design sample that
permits a request to be handed alongside a sequence of objects till it’s
dealt with by one of many objects within the chain. This sample is helpful for
conditions the place it’s not recognized prematurely which object within the chain
ought to deal with the request, or the place the request must be dealt with by
a number of objects within the chain. 

In Java, the Chained or Chain of
Duty Sample could be applied utilizing inheritance or
composition. Inheritance permits for a easy and easy
implementation, however it has restricted flexibility and reuse. Composition
permits for extra flexibility and reuse, however it requires extra complicated code
to handle the objects within the chain.

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