Middleware and Web Services Lecture 1: Motivation and Course Overview

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1 Middleware and Web Services Lecture 1: Motivation and Course Overview doc. Ing. Tomáš Vitvar, Czech Technical University in Prague Faculty of Information Technologies Software and Web Engineering Modified: Sat Aug , 23:22:53 Humla v0.2.2 Hellos Tomáš Vitvar Technical Architect at Oracle SOA and Oracle Integration Architectures Researcher, developer, software architect Have worked in Austria, Ireland, Germany, Czech rep. Universities and companies, ProgrammableWeb member of W3C Advisory Committee EU research and development projects, evaluator Jaroslav Kuchař CTU FIT research assistant, Ph.D. at CTU FEL Web services, data mining, analytics, Web technologies Milan Dojchinovski Ph.D. at CTU FIT, web services Lecture 1: Motivation and Course Overview, CTU Winter Semester 2

2 Overview Web Engineering Curriculla Course at a Glance Assessment Communication and Resources FAQ Lecture 1: Motivation and Course Overview, CTU Winter Semester 3 Web Engineering Curricula Web engineering Part of Software and Web Engineering Curriculum Started winter 2010 (accreditation in 04/2010, CZ, EN) Designed from scratch, no "backward-compatibility problem" Key people Well-established researchers, community work coming from ČVUT, MFF UK, VŠE, intl. experience doc. Ing. Tomáš Vitvar, Ph.D. Web services, Web 2.0 doc. RNDr. Tomáš Skopal, Ph.D. Media, Search prof. RNDr. Peter Vojtáš, CSc. Semantic Web doc. Ing. Vojtěch Svátek, Ph.D. Data Mining, Semantic Web Lecture 1: Motivation and Course Overview, CTU Winter Semester 4

3 Bird's View Web 2.0 engineering is... far beyond PHP and HTML! Lecture 1: Motivation and Course Overview, CTU Winter Semester 5 Overview Web Engineering Curriculla Course at a Glance Motivation and Scope Requirements and Organization Technologies/Development Platform Assessment Communication and Resources FAQ Lecture 1: Motivation and Course Overview, CTU Winter Semester 6

4 Motivation in Brief Systems rely on complex infrastructures A lot of data and many processes, internal and external As people communicate, underlying systems must too But: variety of data formants, technologies, protocols variety of architectures, client-server, peer-to-peer,... Good performance frequent changes in applications' loads, peek hours scalability effective load balancing low costs cheaper to outsource? Rapid changes in applications' functionality modular development reuse of application functionality Lecture 1: Motivation and Course Overview, CTU Winter Semester 7 Spaghetti Architecture Need for the integration One-to-one integration Hard to maintain, vendor interoperability problem Lecture 1: Motivation and Course Overview, CTU Winter Semester 8

5 SOA Architecture Integration organized Enterprise Service Bus, to be used wisely Lecture 1: Motivation and Course Overview, CTU Winter Semester 9 REST Architecture Let's simplify things... unfirom interface, statelessness, hypermedia and HATEOAS,......and use what has proven to be successfull at large HTTP REST = Representational State Transfer Lecture 1: Motivation and Course Overview, CTU Winter Semester 10

6 Good Performance Traditional Solution Traditional hardware model Up-front hardware investments Hardware not optimally utilized Lecture 1: Motivation and Course Overview, CTU Winter Semester 11 Good Performance Cloud Solution Cloud computing model No up-front hardware investments Hardware optimally utilized Lecture 1: Motivation and Course Overview, CTU Winter Semester 12

7 Scope Architectural and conceptual basis Integrating systems, Enterprise Application Integration Service Oriented Architecture, Service Concepts, Middleware Web Service technologies Web architecture HTTP, URI, XML Representational State Transfer Web Service Description Language, SOAP Middleware and Cloud Computing IaaS, PaaS, SaaS Enterprise Service Bus Examples/tutorials Google App Engine / Amazon EC2 Lecture 1: Motivation and Course Overview, CTU Winter Semester 13 Big Picture Architecture services, middleware, protocols, cloud computing Lecture 1: Motivation and Course Overview, CTU Winter Semester 14

8 Overview Web Engineering Curriculla Course at a Glance Motivation and Scope Requirements and Organization Technologies/Development Platform Assessment Communication and Resources FAQ Lecture 1: Motivation and Course Overview, CTU Winter Semester 15 General Requirements Object-oriented programming Principles class, object, inheritance, encapsulation,... They are roots for service principles Java-like syntax All code examples will be in Java or JavaScript (server-side) See FAQ for other details related to Java language Web Architecture Basic notions of HTML, XML, XPath, HTTP, URI Will talk about quite some details of HTTP and URI Other Regular expressions, basics of Linux Graph algorithms Lecture 1: Motivation and Course Overview, CTU Winter Semester 16

9 Organization of Lectures 13 Lectures Czech: Mo 7:15-8:45, T9:155 English: TBA Plan Motivation and Course Overview (html) Introduction to Architectures (html) Application Server (html) Web Service Architecture (html) Web Service Usage (html) Representational State Transfer (html) Uniform Interface (html) HATEOAS, Scalability and Description (html) SOAP and WSDL (html) Oracle SOA Suite 11g (TBD:html) Cloud Computing Concepts (html) Amazon EC2 (TBD:html) Reserve, Exam Lecture 1: Motivation and Course Overview, CTU Winter Semester 17 Organization of Labs Work in teams of 3 people (maximum!) Labs every second week Number of sessions: 6-7, 5 checkpoints: 1. Requirements analysis, basic design of data, process models, technology set-up 2. Application and client implementation 3. Web Services design, implementation, deployment, testing 4. Web Services integration 5. Cloud scalability All textual/design diagrams results in the wiki EDUX: All (nicely commented!) code results in the svn FIT Project Site: Lecture 1: Motivation and Course Overview, CTU Winter Semester 18

10 Solution Architecture Lecture 1: Motivation and Course Overview, CTU Winter Semester 19 Methodology for Lab Work Iterative development of a "toy" application assignment every second week development cycle every second week work in teams Results: seminar project, 5 tasks documentation (in the wiki) implementation (code in the svn) Tasks 1. Design requirements analysis UML diagrams design (data, processes) Web services design functionality you will expose Lecture 1: Motivation and Course Overview, CTU Winter Semester 20

11 Methodology for Lab Work (cont.) Tasks 2. Implementation server-side technology of your choice (pref. Java) some representations of your resources, XML/JSON client-side technology, HTML very simple! 3. Integration expose services to be consumed by others at least 1 read and 1 write consume services exposed by others at least 1 read and 1 write 4. Testing make sure everything works as it should It is iterative development, not a waterfall process Lecture 1: Motivation and Course Overview, CTU Winter Semester 21 Overview Web Engineering Curriculla Course at a Glance Motivation and Scope Requirements and Organization Technologies/Development Platform Assessment Communication and Resources FAQ Lecture 1: Motivation and Course Overview, CTU Winter Semester 22

12 Development Platforms Google App Engine PaaS development platform from Google Java and Python dev environments implements Java Servlet environment for Java Provides convenient plugins for Eclipse and Netbeans To use it: Sign-up at One member creates the app and invites others to join We will refer to it when talking about PaaS See FAQ for details Node.js /Amazon EC2 If you want to try something cutting-edge Note that we show some examples in JavaScript for Node.js Lecture 1: Motivation and Course Overview, CTU Winter Semester 23 Amazon EC2 Free Usage Tier Free usage of EC2 resources up to certain limits but good to try Amazon out! Lecture 1: Motivation and Course Overview, CTU Winter Semester 24

13 Overview Web Engineering Curriculla Course at a Glance Assessment Communication and Resources FAQ Lecture 1: Motivation and Course Overview, CTU Winter Semester 25 Assessment Labs Presence is mandatory You can miss up to 1 lab without sending regrets Every task gives you a max. of 6 points 6 \cdot 5=30 points Activity in labs gives you a max. of 10 points Total maximal points: p_p=40, to pass: p_p \geq 20 Final exam Mandatory written test: 3 exercises, ~1 hour each gives you a max. of 20 points, the total p_t = 60 points F2F discussion: only if p_t \geq 30 Final score: p_p + p_t = 100 maximum points discussion may adjust your points freely Lecture 1: Motivation and Course Overview, CTU Winter Semester 26

14 Final Marks Mark Points In words A výborně B velmi dobře C dobře D uspokojivě E dostatečně F 49 0 nedostatečně Source: Everything good and bad will count practicals, coding, (pro-)activity, passiveness, hacking (bad and good), lectures, exam, cheating,... Lecture 1: Motivation and Course Overview, CTU Winter Semester 27 Overview Web Engineering Curriculla Course at a Glance Assessment Communication and Resources FAQ Lecture 1: Motivation and Course Overview, CTU Winter Semester 28

15 Communication Language Text: English (slides, tweets, posts, instructions, etc.) choose English/Czech for your contributions to the wiki Voice: Czech and English (English version of the course) Channels technology news related to web engineering courses hashtags #w2e_mdwann for MDW-related organizational announcements Direct you can always contact me directly at Lecture 1: Motivation and Course Overview, CTU Winter Semester 29 Overview of Resources Overview of resources Item URL Feed Course page - EDUX - Lab project/svn TBA - Bookshelf RSS References - TBA News/announcements TBA Books from the MDW bookshelf Bill Burke: RESTful Java with JAX-RS James Murty: Programming Amazon Web Services: S3, EC2, SQS, FPS, and SimpleDB Dan Sanderson: Programming Google App Engine Thomas Erl: Service-oriented architecture: concepts, technology, and design Lecture 1: Motivation and Course Overview, CTU Winter Semester 30

16 About Slides Humla Open Source HTML5 Presentation Environment every slide has a unique URL all figures linked with Google drawings possible to format and print in PDF running local, with back-end NodeJS support, and offline Fork it at Humla github repo Keys d e default browsing mode slideshow mode (automatically scales to fullscreen) grid (overview) mode print mode, 2 slides per page slide left slide right debug mode toggle last error messages on/off Lecture 1: Motivation and Course Overview, CTU Winter Semester 31 Code Examples Example code in various languages Java, JavaScript (server-side), xml, command line (bash) and plain text (e.g., BNF-like syntax, regular expressions, etc.) Code colors different colors of the listings' gutters based on the language public,string,test(),{,,,,//,this,is,a,java,code } function,test(),{,,,,//,this,is,a,javascript,code } 1 <test><!aa,this,is,a,xml,code,aa></test> 1 echo,"this,is,a,bash,test" Lecture 1: Motivation and Course Overview, CTU Winter Semester 32

17 Github Repo Online access to selected source code There is a MDW course mdwaexamples Such code will be marked with an icon Example code Click the toolbar to access the code in the repo //,check,if,there,exsits,a,taxonomy,element,for,the,goal,category if,(gte,!==,null),{,,,,//,loop,through,all,service,descriptions,in,the,directory,,,,for,(var,i,=,0;,i,<,directory.length;,i++),,,,,,,,,//,find,taxonomy,element,for,the,service,category,,,,,,,,//,in,the,subtree,defined,by,gte,,,,,,,,if,(findtaxonomyelement(directory[i].category_name,,gte),!==,null),,,,,,,,,,,,//,add,the,service,description,to,the,result,,,,,,,,,,,,result.push(directory[i]); } Lecture 1: Motivation and Course Overview, CTU Winter Semester 33 Use and Alter the Code Clone the mdwaexamples github repo $,git,clone,git://github.com/tomvit/mdwaexamples.git Run it directly in Cloud9 IDE Cloud computing "Development as a Service" Create an account and clone the github repo or host your own C9 IDE Lecture 1: Motivation and Course Overview, CTU Winter Semester 34

18 Tasks from Lectures Will give you tasks/excercices for home They will appear in slides as follows Tasks Test some implementation to see how it works Alter existing example code to meet some requirement Think about changes in some algorithm And so on... They are optional but for your good Lecture 1: Motivation and Course Overview, CTU Winter Semester 35 Overview Web Engineering Curriculla Course at a Glance Assessment Communication and Resources FAQ Lecture 1: Motivation and Course Overview, CTU Winter Semester 36

19 Frequently Asked Questions Technology 1. Q: Web services are independent on the implementation environmnet... Why do you require us to use specific technologies? A: It's not a requirement but we recommend you should use a cuttingedge technology such as GAE or Node.js. All examples will be in a Java-like syntax. 2. Q: We have our own server, can we use it? A: Yes you can, the best if you can install Node.js and C9 IDE on it. Remeber though that by using our recommended technologies you can better grasp cloud conpcepts we will be talking about. Czech English 3. Q: Why English? A: English is the Web's and services' mother tounge. 4. Q: Is there a Czech translation somewhere? A: No. Lecture 1: Motivation and Course Overview, CTU Winter Semester 37 Frequently Asked Questions (cont.) Organization of work 5. Q: What if we do not find a team for the integration? A: It is a must, start planning early! Perhaps you need to adjust your requirements. Lecture 1: Motivation and Course Overview, CTU Winter Semester 38

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