Integration Patterns Integration Patterns
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Patterns Senior Member of Technical Staff and Pattern Languages Knowledge Systems Corp
Kyle Brown An Introduction to Patterns Senior Member of Technical Staff and Pattern Languages Knowledge Systems Corp. 4001 Weston Parkway CSC591O Cary, North Carolina 27513-2303 April 7-9, 1997 919-481-4000 Raleigh, NC [email protected] http://www.ksccary.com Copyright (C) 1996, Kyle Brown, Bobby Woolf, and 1 2 Knowledge Systems Corp. All rights reserved. Overview Bobby Woolf Senior Member of Technical Staff O Patterns Knowledge Systems Corp. O Software Patterns 4001 Weston Parkway O Design Patterns Cary, North Carolina 27513-2303 O Architectural Patterns 919-481-4000 O Pattern Catalogs [email protected] O Pattern Languages http://www.ksccary.com 3 4 Patterns -- Why? Patterns -- Why? !@#$ O Learning software development is hard » Lots of new concepts O Must be some way to » Hard to distinguish good communicate better ideas from bad ones » Allow us to concentrate O Languages and on the problem frameworks are very O Patterns can provide the complex answer » Too much to explain » Much of their structure is incidental to our problem 5 6 Patterns -- What? Patterns -- Parts O Patterns are made up of four main parts O What is a pattern? » Title -- the name of the pattern » A solution to a problem in a context » Problem -- a statement of what the pattern solves » A structured way of representing design » Context -- a discussion of the constraints and information in prose and diagrams forces on the problem »A way of communicating design information from an expert to a novice » Solution -- a description of how to solve the problem » Generative: -
Wiki As Pattern Language
Wiki as Pattern Language Ward Cunningham Cunningham and Cunningham, Inc.1 Sustasis Foundation Portland, Oregon Michael W. Mehaffy Faculty of Architecture Delft University of Technology2 Sustasis Foundation Portland, Oregon Abstract We describe the origin of wiki technology, which has become widely influential, and its relationship to the development of pattern languages in software. We show here how the relationship is deeper than previously understood, opening up the possibility of expanded capability for wikis, including a new generation of “federated” wiki. [NOTE TO REVIEWERS: This paper is part first-person history and part theory. The history is given by one of the participants, an original developer of wiki and co-developer of pattern language. The theory points toward future potential of pattern language within a federated, peer-to-peer framework.] 1. Introduction Wiki is today widely established as a kind of website that allows users to quickly and easily share, modify and improve information collaboratively (Leuf and Cunningham, 2001). It is described on Wikipedia – perhaps its best known example – as “a website which allows its users to add, modify, or delete its content via a web browser usually using a simplified markup language or a rich-text editor” (Wikipedia, 2013). Wiki is so well established, in fact, that a Google search engine result for the term displays approximately 1.25 billion page “hits”, or pages on the World Wide Web that include this term somewhere within their text (Google, 2013a). Along with this growth, the definition of what constitutes a “wiki” has broadened since its introduction in 1995. Consider the example of WikiLeaks, where editable content would defeat the purpose of the site. -
Robust Messaging with Rabbitmq
Spring RabbitMQ for High Load Martin Toshev Who am I Software consultant (CoffeeCupConsulting) BG JUG board member (http://jug.bg) OpenJDK and Oracle RDBMS enthusiast Twitter: @martin_fmi 2 3 Agenda • Messaging Basics • RabbitMQ Overview • Spring RabbitMQ 4 Messaging Basics 5 Messaging • Messaging provides a mechanism for loosely-coupled integration of systems • The central unit of processing in a message is a message which typically contains a body and a header 6 Use cases • Offloading long-running tasks to worker nodes • Distributing and processing high loads of data • Aggregating logs and propagating events between systems • Many others … 7 Messaging protocols • Messaging solutions implement different protocols for transferring of messages such as AMQP, XMPP, MQTT, STOMP, Kafka binary protocol and others • The variety of protocols imply vendor lock-in 8 Messaging protocols comparison AMQP MQTT XMPP STOMP Kafka goal replacement of messaging for instant messaging, message-oriented processing of large proprietary protocols resource-constrained adopted for wider middleware real-time data feeds devices use format binary binary XML-based text-based binary API divided into classes simple (5 basic different XML items ~ 10 basic commands 42 request types in (> 40 methods in operations with 2-3 with multiple types latest version (Kafka RabbitMQ) packet types for each) 2.0.0) reliability publisher/subscriber acknowledgements Acknowledgments Subscriber Acknowledgements, acknowledgements, and resumptions acknowledgements transactional transactions -
Enterprise Integration Patterns Introduction
Enterprise Integration Patterns Gregor Hohpe Sr. Architect, ThoughtWorks [email protected] July 23, 2002 Introduction Integration of applications and business processes is a top priority for many enterprises today. Requirements for improved customer service or self-service, rapidly changing business environments and support for mergers and acquisitions are major drivers for increased integration between existing “stovepipe” systems. Very few new business applications are being developed or deployed without a major focus on integration, essentially making integratability a defining quality of enterprise applications. Many different tools and technologies are available in the marketplace to address the inevitable complexities of integrating disparate systems. Enterprise Application Integration (EAI) tool suites offer proprietary messaging mechanisms, enriched with powerful tools for metadata management, visual editing of data transformations and a series of adapters for various popular business applications. Newer technologies such as the JMS specification and Web Services standards have intensified the focus on integration technologies and best practices. Architecting an integration solution is a complex task. There are many conflicting drivers and even more possible ‘right’ solutions. Whether the architecture was in fact a good choice usually is not known until many months or even years later, when inevitable changes and additions put the original architecture to test. There is no cookbook for enterprise integration solutions. Most integration vendors provide methodologies and best practices, but these instructions tend to be very much geared towards the vendor-provided tool set and often lack treatment of the bigger picture, including underlying guidelines and principles. As a result, successful enterprise integration architects tend to be few and far in between and have usually acquired their knowledge the hard way. -
Rocketbufs: a Framework for Building Efficient, In-Memory, Message-Oriented Middleware
RocketBufs: A Framework for Building Efficient, In-Memory, Message-Oriented Middleware Huy Hoang, Benjamin Cassell, Tim Brecht, Samer Al-Kiswany Cheriton School of Computer Science, University of Waterloo ABSTRACT ACM Reference Format: As companies increasingly deploy message-oriented middleware Huy Hoang, Benjamin Cassell, Tim Brecht, Samer Al-Kiswany. 2020. Rock- (MOM) systems in mission-critical components of their infrastruc- etBufs: A Framework for Building Efficient, In-Memory, Message-Oriented Middleware. In The 14th ACM International Conference on Distributed and tures and services, the demand for improved performance and func- Event-based Systems (DEBS ’20), July 13–17, 2020, Virtual Event, QC, Canada. tionality has accelerated the rate at which new systems are being ACM, New York, NY, USA, 12 pages. https://doi.org/10.1145/3401025.3401744 developed. Unfortunately, existing MOM systems are not designed to take advantages of techniques for high-performance data center communication (e.g., RDMA). In this paper, we describe the design 1 INTRODUCTION and implementation of RocketBufs, a framework which provides Message-Oriented Middleware (MOM) systems, also often referred infrastructure for building high-performance, in-memory Message- to as publish/subscribe, message-queuing, or event-based systems, Oriented Middleware (MOM) applications. RocketBufs provides are a popular class of software designed to support loosely-coupled memory-based buffer abstractions and APIs, which are designed messaging in modern distributed applications. Examples of appli- to work efficiently with different transport protocols. Applications cations and services that utilize MOM systems include IBM’s cloud implemented using RocketBufs manage buffer data using input functions [29], the Apache OpenWhisk serverless framework [10], (rIn) and output (rOut) classes, while the framework is responsible the Hyperledger blockchain framework [7] and streaming media for transmitting, receiving and synchronizing buffer access. -
From a Pattern Language to a Field of Centers and Beyond Patterns and Centers, Innovation, Improvisation, and Creativity
From a Pattern Language to a Field of Centers and Beyond Patterns and Centers, Innovation, Improvisation, and Creativity Hajo Neis Illustration 1: University of Oregon in Portland Downtown Urban Campus The Campus is located in downtown Portland in adapted old warehouse buildings, and was first designed in the Oregon pattern language method with the principles of pat- terns and user participation. The White Stag building facilities are open since 2009. 144 Hajo Neis INTRODUCTION What we call now the ›overall pattern language approach‹ in architecture, urban design, and planning has grown from its original principle of ›pattern and pat- tern language‹ into a large and solid body of theory and professional work. To- day, pattern theory and practice includes a large number of principles, methods, techniques and practical project applications in which patterns themselves play a specific part within this larger body of knowledge. Not only has the pattern lan- guage approach grown in its original area of architecture, but it has also (though less triumphantly than silently) expanded into a large number of other disciplines and fields, in particular computer and software science, education, biology, com- munity psychology, and numerous practical fields. Nevertheless, we first have to acknowledge that the pattern approach originally started with a single principle almost 50 years ago, the principle of pattern and pattern language that gave the name to this school of thought and practical professional project work. In this article we want to trace some of the theoretical and practical develop- ment of the pattern method and its realization in practical projects. We want to explore how challenges and opportunities resulted in the adaptation of the pattern language method into various forms of pattern project formats and formulations including ›pattern language‹ and ›project language.‹ We want to look at various forms of innovations and techniques that deal with theoretical improvements as well as the necessities of adaptation for practical cases and projects. -
Design Pattern
Sitesbay.com A Perfect Place for All Tutorials Resources Java Projects | C | C++ | DS | Interview Questions | JavaScript Core Java | Servlet | JSP | JDBC | Struts | Hibernate | Spring | Java Projects | C | C++ | DS | Interview Questions | Html | CSS | Html5 | JavaScript | Ajax | Angularjs | Basic Programs | C Project | Java Project | Interview Tips | Forums | Java Discussions www.sitesbay.com DESIGN PATTERN By SEKHAR SIR [Thursday, May 29, 2014] Recursive Problem:- If some problem occurs again and again in a particular context then we call it as a Recursive Problem. For example, if an audio player having support with MP2 files gets problem for MP3 files and having support for MP3 gets problem MP4. So it is a recursive problem. In a software application, for example a recursive problem will be transferring the data across layers. Q. Why Design Patterns? Ans:- Design patterns are used for solving recursive problems in a software application design. A design pattern is a description for how to solve a recursive problem. Design patterns are not a technology or a tool or a language or a platform or a framework. Design patterns are effective proven solutions for recursive problems. Q. How many Design Patterns? Ans:- Actually, there is no fixed count of no of design patterns because design patterns is not a package and not in the form of classes. SUN Microsystems constituted a group with four professional with the name of Gang of Four (GOF) to find effective solutions for the recursive problems. According to GOF, they found 23 design patterns as effective solutions for re-occurring problems. GOF divided java design patterns into 4 categories (a) Creational Design Patterns:- (1) Singleton Pattern. -
Analysis of Notification Methods with Respect to Mobile System Characteristics
Proceedings of the Federated Conference on DOI: 10.15439/2015F6 Computer Science and Information Systems pp. 1183–1189 ACSIS, Vol. 5 Analysis of notification methods with respect to mobile system characteristics Piotr Nawrocki ∗, Mikołaj Jakubowski † and Tomasz Godzik ‡ ∗AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Krakow, Poland e-mail:[email protected] †e-mail:[email protected] ‡e-mail:[email protected] Abstract—Recently, there has been an increasing need for most promise and therefore the purpose is to discern their secure, efficient and simple notification methods for mobile usefulness in the best way possible. systems. Such systems are meant to provide users with precise In addition to the protocols and methods above, we inves- tools best suited for work or leisure environments and a lot of effort has been put into creating a multitude of mobile tigated other solutions, such as the Apple push notification applications. However, not much research has been put at the or Line application which, for various reasons, were not same time into determining which of the available protocols considered further. The Apple push notification technology is a are best suited for individual tasks. Here a number of basic good solution, but it is proprietary, i.e. limited to Apple devices notification methods are presented and tests are performed for and that is why we decided to test more universal solutions the most promising ones. An attempt is made to determine which methods have the best throughput, latency, security and other first. There are also solutions (applications) that use their own characteristics. -
Pattern Languages in HCI: a Critical Review
HUMAN–COMPUTER INTERACTION, 2006, Volume 21, pp. 49–102 Copyright © 2006, Lawrence Erlbaum Associates, Inc. Pattern Languages in HCI: A Critical Review Andy Dearden Sheffield Hallam University Janet Finlay Leeds Metropolitan University ABSTRACT This article presents a critical review of patterns and pattern languages in hu- man–computer interaction (HCI). In recent years, patterns and pattern languages have received considerable attention in HCI for their potential as a means for de- veloping and communicating information and knowledge to support good de- sign. This review examines the background to patterns and pattern languages in HCI, and seeks to locate pattern languages in relation to other approaches to in- teraction design. The review explores four key issues: What is a pattern? What is a pattern language? How are patterns and pattern languages used? and How are values reflected in the pattern-based approach to design? Following on from the review, a future research agenda is proposed for patterns and pattern languages in HCI. Andy Dearden is an interaction designer with an interest in knowledge sharing and communication in software development. He is a senior lecturer in the Com- munication and Computing Research Centre at Sheffield Hallam University. Janet Finlay is a usability researcher with an interest in design communication and systems evaluation. She is Professor of Interactive Systems in Innovation North at Leeds Metropolitan University. 50 DEARDEN AND FINLAY CONTENTS 1. INTRODUCTION 2. THE SCOPE OF THIS REVIEW 2.1. General Software Design Patterns 2.2. Interface Software Design Patterns 2.3. Interaction Design Patterns 3. A SHORT HISTORY OF PATTERNS 3.1. -
POJO in Action.Book
SAMPLE CHAPTER POJOs in Action by Chris Richardson Chapter 1 Copyright 2006 Chris Richardson contents PART 1OVERVIEW OF POJOS AND LIGHTWEIGHT FFFFFFFFFFFFFFFFRAMEWORKS .............................................1 Chapter 1 ■ Developing with POJOs: faster and easier 3 Chapter 2 ■ J2EE design decisions 31 PART 2A SIMPLER, FASTER APPROACH................... 59 Chapter 3 ■ Using the Domain Model pattern 61 Chapter 4 ■ Overview of persisting a domain model 95 Chapter 5 ■ Persisting a domain model with JDO 2.0 149 Chapter 6 ■ Persisting a domain model with Hibernate 3 195 Chapter 7 ■ Encapsulating the business logic with a POJO façade 243 PART 3VARIATIONS ........................................... 287 Chapter 8 ■ Using an exposed domain model 289 Chapter 9 ■ Using the Transaction Script pattern 317 Chapter 10 ■ Implementing POJOs with EJB 3 360 vii viii BRIEF CONTENTS PART 4DEALING WITH DATABASES AND CCCCCCCCCCCCCONCURRENCY .......................................405 Chapter 11 ■ Implementing dynamic paged queries 407 Chapter 12 ■ Database transactions and concurrency 451 Chapter 13 ■ Using offline locking patterns 488 Developing with POJOs: faster and easier This chapter covers ■ Comparing lightweight frameworks and EJBs ■ Simplifying development with POJOs ■ Developing an object-oriented design ■ Making POJOs transactional and persistent 3 4 CHAPTER 1 Developing with POJOs: faster and easier Sometimes you must use a technology for a while in order to appreciate its true value. A few years ago I had to go out of the country on a business trip, and I didn’t want to risk missing episodes of my favorite show. So, rather than continu- ing to struggle with the timer function on my VCR, I bought a TiVo box. At the time I thought it was simply going to be a much more convenient and reliable way to record programs. -
Implementing Domain-Driven Design
www.EBooksWorld.ir Praise for Implementing Domain-Driven Design “With Implementing Domain-Driven Design, Vaughn has made an important con- tribution not only to the literature of the Domain-Driven Design community, but also to the literature of the broader enterprise application architecture field. In key chap- ters on Architecture and Repositories, for example, Vaughn shows how DDD fits with the expanding array of architecture styles and persistence technologies for enterprise applications—including SOA and REST, NoSQL and data grids—that has emerged in the decade since Eric Evans’ seminal book was first published. And, fittingly, Vaughn illuminates the blocking and tackling of DDD—the implementation of entities, value objects, aggregates, services, events, factories, and repositories—with plentiful exam- ples and valuable insights drawn from decades of practical experience. In a word, I would describe this book as thorough. For software developers of all experience levels looking to improve their results, and design and implement domain-driven enterprise applications consistently with the best current state of professional practice, Imple- menting Domain-Driven Design will impart a treasure trove of knowledge hard won within the DDD and enterprise application architecture communities over the last cou- ple decades.” —Randy Stafford, Architect At-Large, Oracle Coherence Product Development “Domain-Driven Design is a powerful set of thinking tools that can have a profound impact on how effective a team can be at building software-intensive systems. The thing is that many developers got lost at times when applying these thinking tools and really needed more concrete guidance. In this book, Vaughn provides the missing links between theory and practice. -
Zeromq
ZeroMQ Martin Sústrik <> ØMQ is a messaging system, or "message-oriented middleware", if you will. It's used in environments as diverse as financial services, game development, embedded systems, academic research and aerospace. Messaging systems work basically as instant messaging for applications. An application decides to communicate an event to another application (or multiple applications), it assembles the data to be sent, hits the "send" button and there we go—the messaging system takes care of the rest. Unlike instant messaging, though, messaging systems have no GUI and assume no human beings at the endpoints capable of intelligent intervention when something goes wrong. Messaging systems thus have to be both fault-tolerant and much faster than common instant messaging. ØMQ was originally conceived as an ultra-fast messaging system for stock trading and so the focus was on extreme optimization. The first year of the project was spent devising benchmarking methodology and trying to define an architecture that was as efficient as possible. Later on, approximately in the second year of development, the focus shifted to providing a generic system for building distributed applications and supporting arbitrary messaging patterns, various transport mechanisms, arbitrary language bindings, etc. During the third year the focus was mainly on improving usability and flattening the learning curve. We've adopted the BSD Sockets API, tried to clean up the semantics of individual messaging patterns, and so on. Hopefully, this chapter will give an insight into how the three goals above translated into the internal architecture of ØMQ, and provide some tips for those who are struggling with the same problems.