Chain of responsibility pattern
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Chain of Responsibility simplifies object interconnections. Instead of senders and receivers maintaining references to all candidate receivers, each sender keeps a single reference to the head of the chain, and each receiver keeps a single reference to its immediate successor in the chain.
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Chain of responsibility
The Chain of Responsibility pattern avoids coupling the sender of a request to its receiver by allowing more than one object to handle the request, which is passed along a chain of handler objects until one of the objects handles it. It allows flexibility in distributing responsibilities for handling requests among objects by giving each object a reference to its successor in the chain. While this reduces coupling, there is no guarantee that a request will be handled if it falls off the end of the chain without being processed.
Chain of Responsibility Pattern
This document describes the object behavioral chain of responsibility pattern. It explains that the pattern avoids coupling the sender of a request to its receiver by allowing more than one object to handle the request. A chain is formed by connecting the receiving objects, and a request is passed along the chain until an object handles it. Participants include handlers that define the request interface and can implement the successor link, and concrete handlers that handle requests or forward them to their successor. The chain of responsibility reduces coupling and increases flexibility by allowing the chain structure and responsibilities to change at runtime.
Design Pattern - Chain of Responsibility
in these slides i have explained the Chain of Responsibility design pattern. slides includes definition, explanation and then implementation by code examples.
Proxy Design Pattern
The Proxy design pattern provides a surrogate or placeholder for another object to control access to it. A proxy can act as a placeholder for complex, expensive objects that should not be initialized until needed. This delays the creation of these objects until they are actually required. Proxies can also protect the real component from undue complexity or provide extra functionality. Some common uses of proxies include remote proxies for objects in a different address space, virtual proxies that create objects on demand, and protection proxies that control access to the original object.
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This document defines and explains the key elements of a sequence diagram:
- Sequence diagrams show the interactions between objects through messages over time.
- Objects are represented by vertical lifelines and may send/receive synchronous, asynchronous, reflexive, return, create, and destroy messages.
- Activation bars on lifelines indicate when an object is active.
- Time progresses downward on the diagram, showing the order of messages.
- Events mark specific points of interaction like sending and receiving messages.
Mediator Design Pattern
The mediator pattern promotes loose coupling between classes by defining an object that encapsulates how a set of classes interact. A mediator class handles communication between other "colleague" classes and allows their interaction to vary independently. The mediator pattern is applicable when classes have complex, unstructured interdependencies or when reusing a class is difficult due to many dependencies. It simplifies communication by reducing the number of connections between classes from many-to-many to one-to-many through the mediator.
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Chain of responsibility
The Chain of Responsibility pattern avoids coupling the sender of a request to its receiver by allowing more than one object to handle the request, which is passed along a chain of handler objects until one of the objects handles it. It allows flexibility in distributing responsibilities for handling requests among objects by giving each object a reference to its successor in the chain. While this reduces coupling, there is no guarantee that a request will be handled if it falls off the end of the chain without being processed.
Chain of Responsibility Pattern
This document describes the object behavioral chain of responsibility pattern. It explains that the pattern avoids coupling the sender of a request to its receiver by allowing more than one object to handle the request. A chain is formed by connecting the receiving objects, and a request is passed along the chain until an object handles it. Participants include handlers that define the request interface and can implement the successor link, and concrete handlers that handle requests or forward them to their successor. The chain of responsibility reduces coupling and increases flexibility by allowing the chain structure and responsibilities to change at runtime.
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in these slides i have explained the Chain of Responsibility design pattern. slides includes definition, explanation and then implementation by code examples.
Proxy Design Pattern
The Proxy design pattern provides a surrogate or placeholder for another object to control access to it. A proxy can act as a placeholder for complex, expensive objects that should not be initialized until needed. This delays the creation of these objects until they are actually required. Proxies can also protect the real component from undue complexity or provide extra functionality. Some common uses of proxies include remote proxies for objects in a different address space, virtual proxies that create objects on demand, and protection proxies that control access to the original object.
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- Objects are represented by vertical lifelines and may send/receive synchronous, asynchronous, reflexive, return, create, and destroy messages.
- Activation bars on lifelines indicate when an object is active.
- Time progresses downward on the diagram, showing the order of messages.
- Events mark specific points of interaction like sending and receiving messages.
Mediator Design Pattern
The mediator pattern promotes loose coupling between classes by defining an object that encapsulates how a set of classes interact. A mediator class handles communication between other "colleague" classes and allows their interaction to vary independently. The mediator pattern is applicable when classes have complex, unstructured interdependencies or when reusing a class is difficult due to many dependencies. It simplifies communication by reducing the number of connections between classes from many-to-many to one-to-many through the mediator.
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2. Create ReminderAlarm and Notification classes that act as colleagues. The alarm raises events when triggered and the notification displays and handles user input.
3. When the alarm triggers, it notifies the mediator. The mediator then tells the notification to display.
4. The notification displays and handles user input, notifying the mediator of snooze or close.
5. If snooze, the mediator sets a timer then tells the alarm to trigger again after the time span. If close
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Allez au-delà du battage médiatique autour de l’IA et découvrez des techniques pratiques pour utiliser l’IA de manière responsable à travers les données de votre organisation. Explorez comment utiliser les graphes de connaissances pour augmenter la précision, la transparence et la capacité d’explication dans les systèmes d’IA générative. Vous partirez avec une expérience pratique combinant les relations entre les données et les LLM pour apporter du contexte spécifique à votre domaine et améliorer votre raisonnement.
Amenez votre ordinateur portable et nous vous guiderons sur la mise en place de votre propre pile d’IA générative, en vous fournissant des exemples pratiques et codés pour démarrer en quelques minutes.
Using Xen Hypervisor for Functional Safety
An update on making Xen hypervisor functionally safe and enhancing its usage in automotive and industrial use cases
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...
Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry.
Crescat Event for concert promoters and event agencies. Crescat Venue for music venues, conference centers, wedding venues, concert halls and more. And Crescat Festival for festivals, conferences and complex events.
With a wide range of popular features such as event scheduling, shift management, volunteer and crew coordination, artist booking and much more, Crescat is designed for customisation and ease-of-use.
Over 125,000 events have been planned in Crescat and with hundreds of customers of all shapes and sizes, from boutique event agencies through to international concert promoters, Crescat is rigged for success. What's more, we highly value feedback from our users and we are constantly improving our software with updates, new features and improvements.
If you plan events, run a venue or produce festivals and you're looking for ways to make your life easier, then we have a solution for you. Try our software for free or schedule a no-obligation demo with one of our product specialists today at crescat.io
Using Query Store in Azure PostgreSQL to Understand Query Performance
Microsoft has added an excellent new extension in PostgreSQL on their Azure Platform. This session, presented at Posette 2024, covers what Query Store is and the types of information you can get out of it.
Microservice Teams - How the cloud changes the way we work
A lot of technical challenges and complexity come with building a cloud-native and distributed architecture. The way we develop backend software has fundamentally changed in the last ten years. Managing a microservices architecture demands a lot of us to ensure observability and operational resiliency. But did you also change the way you run your development teams?
Sven will talk about Atlassian’s journey from a monolith to a multi-tenanted architecture and how it affected the way the engineering teams work. You will learn how we shifted to service ownership, moved to more autonomous teams (and its challenges), and established platform and enablement teams.
Vitthal Shirke Java Microservices Resume.pdf
Software Engineering, Software Consulting, Tech Lead, Spring Boot, Spring Cloud, Spring Core, Spring JDBC, Spring Transaction, Spring MVC, OpenShift Cloud Platform, Kafka, REST, SOAP, LLD & HLD.
Empowering Growth with Best Software Development Company in Noida - Deuglo
Do you want Software for your Business? Visit Deuglo
Deuglo has top Software Developers in India. They are experts in software development and help design and create custom Software solutions.
Deuglo follows seven steps methods for delivering their services to their customers. They called it the Software development life cycle process (SDLC).
Requirement — Collecting the Requirements is the first Phase in the SSLC process.
Feasibility Study — after completing the requirement process they move to the design phase.
Design — in this phase, they start designing the software.
Coding — when designing is completed, the developers start coding for the software.
Testing — in this phase when the coding of the software is done the testing team will start testing.
Installation — after completion of testing, the application opens to the live server and launches!
Maintenance — after completing the software development, customers start using the software.
Webinar On-Demand: Using Flutter for Embedded
Flutter is a popular open source, cross-platform framework developed by Google. In this webinar we'll explore Flutter and its architecture, delve into the Flutter Embedder and Flutter’s Dart language, discover how to leverage Flutter for embedded device development, learn about Automotive Grade Linux (AGL) and its consortium and understand the rationale behind AGL's choice of Flutter for next-gen IVI systems. Don’t miss this opportunity to discover whether Flutter is right for your project.
Artificia Intellicence and XPath Extension Functions
The purpose of this presentation is to provide an overview of how you can use AI from XSLT, XQuery, Schematron, or XML Refactoring operations, the potential benefits of using AI, and some of the challenges we face.
Energy consumption of Database Management - Florina Jonuzi
Presentation from Florina Jonuzi at the GSD Community Stage Meetup on June 06, 2024
UI5con 2024 - Bring Your Own Design System
How do you combine the OpenUI5/SAPUI5 programming model with a design system that makes its controls available as Web Components? Since OpenUI5/SAPUI5 1.120, the framework supports the integration of any Web Components. This makes it possible, for example, to natively embed own Web Components of your design system which are created with Stencil. The integration embeds the Web Components in a way that they can be used naturally in XMLViews, like with standard UI5 controls, and can be bound with data binding. Learn how you can also make use of the Web Components base class in OpenUI5/SAPUI5 to also integrate your Web Components and get inspired by the solution to generate a custom UI5 library providing the Web Components control wrappers for the native ones.
Measures in SQL (SIGMOD 2024, Santiago, Chile)
SQL has attained widespread adoption, but Business Intelligence tools still use their own higher level languages based upon a multidimensional paradigm. Composable calculations are what is missing from SQL, and we propose a new kind of column, called a measure, that attaches a calculation to a table. Like regular tables, tables with measures are composable and closed when used in queries.
SQL-with-measures has the power, conciseness and reusability of multidimensional languages but retains SQL semantics. Measure invocations can be expanded in place to simple, clear SQL.
To define the evaluation semantics for measures, we introduce context-sensitive expressions (a way to evaluate multidimensional expressions that is consistent with existing SQL semantics), a concept called evaluation context, and several operations for setting and modifying the evaluation context.
A talk at SIGMOD, June 9–15, 2024, Santiago, Chile
Authors: Julian Hyde (Google) and John Fremlin (Google)
https://doi.org/10.1145/3626246.3653374
Oracle Database 19c New Features for DBAs and Developers.pptx
Oracle Database 19c New Features for DBAs and Developers. This video you can watch from my youtube channel at https://youtu.be/m-F-mZA3MkU
How to write a program in any programming language
How to write a program in any programming language
openEuler Case Study - The Journey to Supply Chain Security
openEuler Case Study - The Journey to Supply Chain Security
Automated software refactoring with OpenRewrite and Generative AI.pptx.pdf
https://2024.springio.net/sessions/automated-software-refactoring-with-openrewrite-and-generative-ai/
Recently uploaded (20)
Atelier - Innover avec l’IA Générative et les graphes de connaissances
Atelier - Innover avec l’IA Générative et les graphes de connaissances
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...
Using Query Store in Azure PostgreSQL to Understand Query Performance
Using Query Store in Azure PostgreSQL to Understand Query Performance
Microservice Teams - How the cloud changes the way we work
Microservice Teams - How the cloud changes the way we work
Empowering Growth with Best Software Development Company in Noida - Deuglo
Empowering Growth with Best Software Development Company in Noida - Deuglo
Artificia Intellicence and XPath Extension Functions
Artificia Intellicence and XPath Extension Functions
Energy consumption of Database Management - Florina Jonuzi
Energy consumption of Database Management - Florina Jonuzi
Oracle Database 19c New Features for DBAs and Developers.pptx
Oracle Database 19c New Features for DBAs and Developers.pptx
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How to write a program in any programming language
openEuler Case Study - The Journey to Supply Chain Security
openEuler Case Study - The Journey to Supply Chain Security
Automated software refactoring with OpenRewrite and Generative AI.pptx.pdf
Automated software refactoring with OpenRewrite and Generative AI.pptx.pdf
Chain of responsibility pattern
- 1. Design Pattern Chain of Responsibility
- 2. Introduction • Category : Behavioral • Founder : Gang of Four
- 3. UML Diagram
- 4. Intent • Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. • Chain the receiving objects and pass the request along the chain until an object handles it. • Launch-and-leave requests with a single processing pipeline that contains many possible handlers. • An object-oriented linked list with recursive traversal.
- 5. Problem • There is a potentially variable number of "handler" or "processing element" or "node" objects, and a stream of requests that must be handled. • Need to efficiently process the requests without hard-wiring handler relationships and precedence, or request-to-handler mappings.
- 6. Solution • Encapsulate the processing elements inside a "pipeline" abstraction; and have clients "launch and leave" their requests at the entrance to the pipeline. • The pattern chains the receiving objects together, and then passes any request messages from object to object until it reaches an object capable of handling the message. The number and type of handler objects isn't known a priori, they can be configured dynamically. • The chaining mechanism uses recursive composition to allow an unlimited number of handlers to be linked. • Chain of Responsibility simplifies object interconnections. Instead of senders and receivers maintaining references to all candidate receivers, each sender keeps a single reference to the head of the chain, and each receiver keeps a single reference to its immediate successor in the chain. • Make sure there exists a "safety net" to "catch" any requests which go unhandled. • Do not use Chain of Responsibility when each request is only handled by one handler, or, when the client object knows which service object should handle the request.
- 8. Architecture • The derived classes know how to satisfy Client requests. If the "current" object is not available or sufficient, then it delegates to the base class, which delegates to the "next" object, and the circle of life continues. • Multiple handlers could contribute to the handling of each request. The request can be passed down the entire length of the chain, with the last link being careful not to delegate to a "null next".
- 9. Code Snippet
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- 14. Real Life Example • ATM use the Chain of Responsibility in money giving mechanism. • User enters the amount to be retrieved and the ATM dispense amount in terms of defined currency bills such as 100 Rs, 50 Rs, 20 Rs, 5 Rs, etc.
- 16. Points to Remember • The base class maintains a "next" pointer. • Each derived class implements its contribution for handling the request. • If the request needs to be "passed on", then the derived class "calls back" to the base class, which delegates to the "next" pointer. • The client (or some third party) creates and links the chain (which may include a link from the last node to the root node). • The client "launches and leaves" each request with the root of the chain. • Recursive delegation produces the illusion of magic.