This document discusses Representational State Transfer (REST) and compares it to Service Oriented Architecture (SOA). It provides background on the early web and how REST emerged as a set of constraints for networked applications. It notes that REST is not a technology, standard, or product, but rather an architectural style. The document discusses core REST concepts like resources, representations, and stateless interactions over the uniform interface of HTTP. It addresses some common misconceptions about REST and whether it is only suited for simple use cases.
Containers brought new approach for implementation of DevOps workflows. So our CEO, Ruslan Synytsky, devoted a speech to this topic during Madrid meetup and described in details how Java developers can get benefits from Docker containers in Jelastic Cloud.
Expect the unexpected: Anticipate and prepare for failures in microservices b...Bhakti Mehta
This session covers best practices for building resilient, stable RESTful services that can survive failures in distributed environments, such as transient impulses, random load, stress, or failures from some dependent components. It focuses on various techniques such as circuit breakers, bulkheads, and fail fast to ensure that services stay up and keep running despite failures.
Distributed Design and Architecture of Cloud FoundryDerek Collison
In this session we will dig deep into Cloud Foundry's core architecture and design principles. We will discuss the challenges around scaling and operating a large scale service as we combined the PaaS and traditional IaaS layers, and how we achieve multiple updates per week to the system with no perceived downtime. Allowing user to download a single virtual machine that is a complete replica of the service presented some challenges as well, and we will discuss our approach to offering up the downloadable private cloud.
Refactoring Organizations - A Netflix Study (QCon NYC 2017)Josh Evans
Is your service architecture and engineering velocity constrained by organizational concerns? Does it seem impossible to give priority to key initiatives regardless of intent? Are engineers switching tasks so often that they are just treading water? Are critical projects endlessly backlogged? Has staffing up pushed the limits of your team structure? Navigating through challenges like these can be daunting and solutions fraught with uncertainty. How do you know what, where, when to change. And whatever the answer is today it will most certainly vary over time. Effective organizations evolve, at key inflection points, to support critical business and technical goals. There is not only a strong relationship between organizations and the software they produce (Conway’s Law) but many organizational solutions can be derived from analogs in the technical realm. In other words, we can treat organizational improvement as a refactoring exercise. Over the last 20 years Netflix engineering has proven time and again an ability to adapt and grow, resulting in undisputed dominance over the global internet tv market. In this talk we’ll use Netflix as a case study to illustrate how specific strategies, framed as technical analogs, have been employed to maximize engineering agility, velocity, and impact. These powerful, yet simple strategies and solutions provide a useful blueprint for organizational success.
Containers brought new approach for implementation of DevOps workflows. So our CEO, Ruslan Synytsky, devoted a speech to this topic during Madrid meetup and described in details how Java developers can get benefits from Docker containers in Jelastic Cloud.
Expect the unexpected: Anticipate and prepare for failures in microservices b...Bhakti Mehta
This session covers best practices for building resilient, stable RESTful services that can survive failures in distributed environments, such as transient impulses, random load, stress, or failures from some dependent components. It focuses on various techniques such as circuit breakers, bulkheads, and fail fast to ensure that services stay up and keep running despite failures.
Distributed Design and Architecture of Cloud FoundryDerek Collison
In this session we will dig deep into Cloud Foundry's core architecture and design principles. We will discuss the challenges around scaling and operating a large scale service as we combined the PaaS and traditional IaaS layers, and how we achieve multiple updates per week to the system with no perceived downtime. Allowing user to download a single virtual machine that is a complete replica of the service presented some challenges as well, and we will discuss our approach to offering up the downloadable private cloud.
Refactoring Organizations - A Netflix Study (QCon NYC 2017)Josh Evans
Is your service architecture and engineering velocity constrained by organizational concerns? Does it seem impossible to give priority to key initiatives regardless of intent? Are engineers switching tasks so often that they are just treading water? Are critical projects endlessly backlogged? Has staffing up pushed the limits of your team structure? Navigating through challenges like these can be daunting and solutions fraught with uncertainty. How do you know what, where, when to change. And whatever the answer is today it will most certainly vary over time. Effective organizations evolve, at key inflection points, to support critical business and technical goals. There is not only a strong relationship between organizations and the software they produce (Conway’s Law) but many organizational solutions can be derived from analogs in the technical realm. In other words, we can treat organizational improvement as a refactoring exercise. Over the last 20 years Netflix engineering has proven time and again an ability to adapt and grow, resulting in undisputed dominance over the global internet tv market. In this talk we’ll use Netflix as a case study to illustrate how specific strategies, framed as technical analogs, have been employed to maximize engineering agility, velocity, and impact. These powerful, yet simple strategies and solutions provide a useful blueprint for organizational success.
<November 2017 Updated from earlier presentations on Cloud-native Data>
Cloud-native applications form the foundation for modern, cloud-scale digital solutions, and the patterns and practices for cloud-native at the app tier are becoming widely understood – statelessness, service discovery, circuit breakers and more. But little has changed in the data tier. Our modern apps are often connected to monolithic shared databases that have monolithic practices wrapped around them. As a result, the autonomy promised by moving to a microservices application architecture is compromised.
What we need are patterns and practices for cloud-native data. The anti-patterns of shared databases and simple proxy-style web services to front them give way to approaches that include use of caches (Netflix calls caching their hidden microservice), database per service and polyglot persistence, modern versions of ETL and data integration and more. In this session, aimed at the application developer/architect, Cornelia will look at those patterns and see how they serve the needs of the cloud-native application.
Do you need Ops in your new startup? If not now, then when? And...what is Ops?
Learn how to scale ruby-based distributed software infrastructure in the cloud to serve 4,000 requests per second, handle 400 updates per second, and achieve 99.97% uptime – all while building the product at the speed of light.
Unimpressed? Now try doing the above altogether without the Ops team, while growing your traffic 100x in 6 months and deploying 5-6 times a day!
It could be a dream, but luckily it's a reality that could be yours.
Cloud-native Data: Every Microservice Needs a Cachecornelia davis
Presented at the Pivotal Toronto Users Group, March 2017
Cloud-native applications form the foundation for modern, cloud-scale digital solutions, and the patterns and practices for cloud-native at the app tier are becoming widely understood – statelessness, service discovery, circuit breakers and more. But little has changed in the data tier. Our modern apps are often connected to monolithic shared databases that have monolithic practices wrapped around them. As a result, the autonomy promised by moving to a microservices application architecture is compromised.
With lessons from the application tier to guide us, the industry is now figuring out what the cloud-native architectural patterns are at the data tier. Join us to explore some of these with Cornelia Davis, a five year Cloud Foundry veteran who is now focused on cloud-native data. As it happens, every microservice needs a cache and this evening will drill deep on that topic. She’ll cover a variety of caching patterns and use cases, and demonstrate how their use helps preserve the autonomy that is driving agile software delivery practices today.
This presentation talks about some typical problems you might find in (Enterprise) Java code. You can find a (German) video at
http://it-republik.de/jaxenter/news/10-typische-Fehler-in-Enterprise-Java-Anwendungen-057701.html
Spark Job Server and Spark as a Query Engine (Spark Meetup 5/14)Evan Chan
This was a talk that Kelvin Chu and I just gave at the SF Bay Area Spark Meetup 5/14 at Palantir Technologies.
We discussed the Spark Job Server (http://github.com/ooyala/spark-jobserver), its history, example workflows, architecture, and exciting future plans to provide HA spark job contexts.
We also discussed the use case of the job server at Ooyala to facilitate fast query jobs using shared RDD and a shared job context, and how we integrate with Apache Cassandra.
Video and slides synchronized, mp3 and slide download available at URL https://bit.ly/2y2yPiS.
Colin McCabe talks about the ongoing effort to replace the use of Zookeeper in Kafka: why they want to do it and how it will work. He discusses the limitations they have found and how Kafka benefits both in terms of stability and scalability by bringing consensus in house. He talks about their progress, what work is remaining, and how contributors can help. Filmed at qconsf.com.
Colin McCabe is a Kafka committer at Confluent, working on the scalability and extensibility of Kafka. Previously, he worked on the Hadoop Distributed Filesystem and the Ceph Filesystem.
Configuring and maintaining a continuous integration environment is quite a bit of work. It requires ongoing resources both in terms of manpower and hardware infrastructure. As an application evolves so does the number of ongoing projects. The challenge is creating a scalable continuous integration environment which does not impede development and can handle the complexities of Java EE testing. This session covers how to setup and configure a cloud-based continuous integration environment for Java EE applications.
The presentation will focus on demonstrating how to use Atlassian Bamboo running on AWS to build and test a Maven/Gradle Java EE project that uses Arquillian for testing. Topics that will be covered include creating a custom AWS VM for use with Bamboo, creating an Amazon VPC (Virtual Private Cloud) along with test database using Amazon RDS. The presentation will delve into the specifics of testing EJBs, WebSocket endpoints, RESTful web services, as well as performing load testing in this environment. Security, cost control, and build monitoring will be covered as well.
Java script nirvana in netbeans [con5679]Ryan Cuprak
JavaOne 2016
NetBeans is not just a Java IDE. It supports JavaScript as a first-class citizen and provides a complete integrated development environment. It also provides project types for server-side JavaScript (Node.js) as well as web browsers and mobile (Apache Cordova). In addition, it supports Grunt, Mocha and Selenium, Angular and Knockout, and more. This session provides an update on NetBeans 8.1 and demonstrates the top new JavaScript features. You will see a Node.js application in action, look at the support for JavaScript unit testing, and also see how easy it is to debug an Apache Cordova application running on a tethered iPhone.
An introduction to REST and RESTful web services.
You can take the course below to learn about REST & RESTful web services.
https://www.udemy.com/building-php-restful-web-services/
<November 2017 Updated from earlier presentations on Cloud-native Data>
Cloud-native applications form the foundation for modern, cloud-scale digital solutions, and the patterns and practices for cloud-native at the app tier are becoming widely understood – statelessness, service discovery, circuit breakers and more. But little has changed in the data tier. Our modern apps are often connected to monolithic shared databases that have monolithic practices wrapped around them. As a result, the autonomy promised by moving to a microservices application architecture is compromised.
What we need are patterns and practices for cloud-native data. The anti-patterns of shared databases and simple proxy-style web services to front them give way to approaches that include use of caches (Netflix calls caching their hidden microservice), database per service and polyglot persistence, modern versions of ETL and data integration and more. In this session, aimed at the application developer/architect, Cornelia will look at those patterns and see how they serve the needs of the cloud-native application.
Do you need Ops in your new startup? If not now, then when? And...what is Ops?
Learn how to scale ruby-based distributed software infrastructure in the cloud to serve 4,000 requests per second, handle 400 updates per second, and achieve 99.97% uptime – all while building the product at the speed of light.
Unimpressed? Now try doing the above altogether without the Ops team, while growing your traffic 100x in 6 months and deploying 5-6 times a day!
It could be a dream, but luckily it's a reality that could be yours.
Cloud-native Data: Every Microservice Needs a Cachecornelia davis
Presented at the Pivotal Toronto Users Group, March 2017
Cloud-native applications form the foundation for modern, cloud-scale digital solutions, and the patterns and practices for cloud-native at the app tier are becoming widely understood – statelessness, service discovery, circuit breakers and more. But little has changed in the data tier. Our modern apps are often connected to monolithic shared databases that have monolithic practices wrapped around them. As a result, the autonomy promised by moving to a microservices application architecture is compromised.
With lessons from the application tier to guide us, the industry is now figuring out what the cloud-native architectural patterns are at the data tier. Join us to explore some of these with Cornelia Davis, a five year Cloud Foundry veteran who is now focused on cloud-native data. As it happens, every microservice needs a cache and this evening will drill deep on that topic. She’ll cover a variety of caching patterns and use cases, and demonstrate how their use helps preserve the autonomy that is driving agile software delivery practices today.
This presentation talks about some typical problems you might find in (Enterprise) Java code. You can find a (German) video at
http://it-republik.de/jaxenter/news/10-typische-Fehler-in-Enterprise-Java-Anwendungen-057701.html
Spark Job Server and Spark as a Query Engine (Spark Meetup 5/14)Evan Chan
This was a talk that Kelvin Chu and I just gave at the SF Bay Area Spark Meetup 5/14 at Palantir Technologies.
We discussed the Spark Job Server (http://github.com/ooyala/spark-jobserver), its history, example workflows, architecture, and exciting future plans to provide HA spark job contexts.
We also discussed the use case of the job server at Ooyala to facilitate fast query jobs using shared RDD and a shared job context, and how we integrate with Apache Cassandra.
Video and slides synchronized, mp3 and slide download available at URL https://bit.ly/2y2yPiS.
Colin McCabe talks about the ongoing effort to replace the use of Zookeeper in Kafka: why they want to do it and how it will work. He discusses the limitations they have found and how Kafka benefits both in terms of stability and scalability by bringing consensus in house. He talks about their progress, what work is remaining, and how contributors can help. Filmed at qconsf.com.
Colin McCabe is a Kafka committer at Confluent, working on the scalability and extensibility of Kafka. Previously, he worked on the Hadoop Distributed Filesystem and the Ceph Filesystem.
Configuring and maintaining a continuous integration environment is quite a bit of work. It requires ongoing resources both in terms of manpower and hardware infrastructure. As an application evolves so does the number of ongoing projects. The challenge is creating a scalable continuous integration environment which does not impede development and can handle the complexities of Java EE testing. This session covers how to setup and configure a cloud-based continuous integration environment for Java EE applications.
The presentation will focus on demonstrating how to use Atlassian Bamboo running on AWS to build and test a Maven/Gradle Java EE project that uses Arquillian for testing. Topics that will be covered include creating a custom AWS VM for use with Bamboo, creating an Amazon VPC (Virtual Private Cloud) along with test database using Amazon RDS. The presentation will delve into the specifics of testing EJBs, WebSocket endpoints, RESTful web services, as well as performing load testing in this environment. Security, cost control, and build monitoring will be covered as well.
Java script nirvana in netbeans [con5679]Ryan Cuprak
JavaOne 2016
NetBeans is not just a Java IDE. It supports JavaScript as a first-class citizen and provides a complete integrated development environment. It also provides project types for server-side JavaScript (Node.js) as well as web browsers and mobile (Apache Cordova). In addition, it supports Grunt, Mocha and Selenium, Angular and Knockout, and more. This session provides an update on NetBeans 8.1 and demonstrates the top new JavaScript features. You will see a Node.js application in action, look at the support for JavaScript unit testing, and also see how easy it is to debug an Apache Cordova application running on a tethered iPhone.
An introduction to REST and RESTful web services.
You can take the course below to learn about REST & RESTful web services.
https://www.udemy.com/building-php-restful-web-services/
This slide show is from my presentation on what JSON and REST are. It aims to provide a number of talking points by comparing apples and oranges (JSON vs. XML and REST vs. web services).
It will describes SOAP/REST differences and SOAP web services in detail with practical approach. it shows usage of SOAP, XML, JAVA, WSDL, XSD and RPC with examples.
What is REST?
What is RESTful Webservices
HTTP-REST Request Basics
HTTP-REST Vocabulary
Authentication (OAuth)
OAuth 2.0 Web Server Flow
REST APIs using Apex REST
Resources
Les Hazlewood, Stormpath co-founder and CTO and the Apache Shiro PMC Chair demonstrates how to design a beautiful REST + JSON API. Includes the principles of RESTful design, how REST differs from XML, tips for increasing adoption of your API, and security concerns.
Presentation video: https://www.youtube.com/watch?v=5WXYw4J4QOU
More info: http://www.stormpath.com/blog/designing-rest-json-apis
Further reading: http://www.stormpath.com/blog
Sign up for Stormpath: https://api.stormpath.com/register
Stormpath is a user management and authentication service for developers. By offloading user management and authentication to Stormpath, developers can bring applications to market faster, reduce development costs, and protect their users. Easy and secure, the flexible cloud service can manage millions of users with a scalable pricing model.
Der Vortrag erklärt den Weg vom HTTP-Request bis zur fertigen Action und was dazwischen passiert. Auszug aus den Inhalten: Wo kann man den Bootstrap manipulieren und erweitern? Welche Möglichkeiten gibt es, sich in den Dispatch einzuhängen?
Advanced Web Services Hacking (AusCERT 06)Shreeraj Shah
Advanced Web Services Hacking - Attacks & Defense (AusCERT 2006).
Web services attacks are on the rise with evolution of web applications which are consuming back end web services over SOAP. UDDI, SOAP and WSDL are three important blocks of this new attack vectors. Several attacks are evolving around web services like UDDI enumeration, XPATH injection, XML poisoning, WSDL scanning, SOAP bruteforcing etc. At the same time new range of defense is evolving for web services with SOAP filtering. It is critical to know methodologies, attack vectors and defense strategies before deploying web services into the corporate environment. This paper will discuss advanced web services hacking methods and defense approaches.
Cloud Application Rationalization- The Cloud, the Enterprise, and Making the ...Chad Lawler
“Cloud Application Rationalization - The Cloud, the Enterprise and Making the Right Decisions for your Business”, Gartner Symposium ITXPO, October 24, 2011, Author Chad M. Lawler, Ph.D., Director, Consulting Services, Cloud Computing, U.S. Strategic Technology Solutions, Hitachi Consulting
A RESTful Introduction will cover the basics of what REST means and takes advantage of. We will talk about status codes, verbs and APIs in general.
The presentation was held by Daniel Toader and Andrei Pirjoleanu from eMAG.
The Good, the Bad and the Ugly of Migrating Hundreds of Legacy Applications ...Josef Adersberger
Running applications on Kubernetes can provide a lot of benefits: more dev speed, lower ops costs, and a higher elasticity & resiliency in production. Kubernetes is the place to be for cloud native apps. But what to do if you’ve no shiny new cloud native apps but a whole bunch of JEE legacy systems? No chance to leverage the advantages of Kubernetes? Yes you can!
We’re facing the challenge of migrating hundreds of JEE legacy applications of a major German insurance company onto a Kubernetes cluster within one year. We're now close to the finish line and it worked pretty well so far.
The talk will be about the lessons we've learned - the best practices and pitfalls we've discovered along our way. We'll provide our answers to life, the universe and a cloud native journey like:
- What technical constraints of Kubernetes can be obstacles for applications and how to tackle these?
- How to architect a landscape of hundreds of containerized applications with their surrounding infrastructure like DBs MQs and IAM and heavy requirements on security?
- How to industrialize and govern the migration process?
- How to leverage the possibilities of a cloud native platform like Kubernetes without challenging the tight timeline?
Migrating Hundreds of Legacy Applications to Kubernetes - The Good, the Bad, ...QAware GmbH
CloudNativeCon North America 2017, Austin (Texas, USA): Talk by Josef Adersberger (@adersberger, CTO at QAware)
Abstract:
Running applications on Kubernetes can provide a lot of benefits: more dev speed, lower ops costs, and a higher elasticity & resiliency in production. Kubernetes is the place to be for cloud native apps. But what to do if you’ve no shiny new cloud native apps but a whole bunch of JEE legacy systems? No chance to leverage the advantages of Kubernetes? Yes you can!
We’re facing the challenge of migrating hundreds of JEE legacy applications of a major German insurance company onto a Kubernetes cluster within one year. We're now close to the finish line and it worked pretty well so far.
The talk will be about the lessons we've learned - the best practices and pitfalls we've discovered along our way. We'll provide our answers to life, the universe and a cloud native journey like:
- What technical constraints of Kubernetes can be obstacles for applications and how to tackle these?
- How to architect a landscape of hundreds of containerized applications with their surrounding infrastructure like DBs MQs and IAM and heavy requirements on security?
- How to industrialize and govern the migration process?
- How to leverage the possibilities of a cloud native platform like Kubernetes without challenging the tight timeline?
LA HUG - Video Testimonials with Chynna Morgan - June 2024Lital Barkan
Have you ever heard that user-generated content or video testimonials can take your brand to the next level? We will explore how you can effectively use video testimonials to leverage and boost your sales, content strategy, and increase your CRM data.🤯
We will dig deeper into:
1. How to capture video testimonials that convert from your audience 🎥
2. How to leverage your testimonials to boost your sales 💲
3. How you can capture more CRM data to understand your audience better through video testimonials. 📊
VAT Registration Outlined In UAE: Benefits and Requirementsuae taxgpt
Vat Registration is a legal obligation for businesses meeting the threshold requirement, helping companies avoid fines and ramifications. Contact now!
https://viralsocialtrends.com/vat-registration-outlined-in-uae/
Kseniya Leshchenko: Shared development support service model as the way to ma...Lviv Startup Club
Kseniya Leshchenko: Shared development support service model as the way to make small projects with small budgets profitable for the company (UA)
Kyiv PMDay 2024 Summer
Website – www.pmday.org
Youtube – https://www.youtube.com/startuplviv
FB – https://www.facebook.com/pmdayconference
RMD24 | Retail media: hoe zet je dit in als je geen AH of Unilever bent? Heid...BBPMedia1
Grote partijen zijn al een tijdje onderweg met retail media. Ondertussen worden in dit domein ook de kansen zichtbaar voor andere spelers in de markt. Maar met die kansen ontstaan ook vragen: Zelf retail media worden of erop adverteren? In welke fase van de funnel past het en hoe integreer je het in een mediaplan? Wat is nu precies het verschil met marketplaces en Programmatic ads? In dit half uur beslechten we de dilemma's en krijg je antwoorden op wanneer het voor jou tijd is om de volgende stap te zetten.
RMD24 | Debunking the non-endemic revenue myth Marvin Vacquier Droop | First ...BBPMedia1
Marvin neemt je in deze presentatie mee in de voordelen van non-endemic advertising op retail media netwerken. Hij brengt ook de uitdagingen in beeld die de markt op dit moment heeft op het gebied van retail media voor niet-leveranciers.
Retail media wordt gezien als het nieuwe advertising-medium en ook mediabureaus richten massaal retail media-afdelingen op. Merken die niet in de betreffende winkel liggen staan ook nog niet in de rij om op de retail media netwerken te adverteren. Marvin belicht de uitdagingen die er zijn om echt aansluiting te vinden op die markt van non-endemic advertising.
Unveiling the Secrets How Does Generative AI Work.pdfSam H
At its core, generative artificial intelligence relies on the concept of generative models, which serve as engines that churn out entirely new data resembling their training data. It is like a sculptor who has studied so many forms found in nature and then uses this knowledge to create sculptures from his imagination that have never been seen before anywhere else. If taken to cyberspace, gans work almost the same way.
Improving profitability for small businessBen Wann
In this comprehensive presentation, we will explore strategies and practical tips for enhancing profitability in small businesses. Tailored to meet the unique challenges faced by small enterprises, this session covers various aspects that directly impact the bottom line. Attendees will learn how to optimize operational efficiency, manage expenses, and increase revenue through innovative marketing and customer engagement techniques.
Affordable Stationery Printing Services in Jaipur | Navpack n PrintNavpack & Print
Looking for professional printing services in Jaipur? Navpack n Print offers high-quality and affordable stationery printing for all your business needs. Stand out with custom stationery designs and fast turnaround times. Contact us today for a quote!
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Digital Transformation and IT Strategy Toolkit and TemplatesAurelien Domont, MBA
This Digital Transformation and IT Strategy Toolkit was created by ex-McKinsey, Deloitte and BCG Management Consultants, after more than 5,000 hours of work. It is considered the world's best & most comprehensive Digital Transformation and IT Strategy Toolkit. It includes all the Frameworks, Best Practices & Templates required to successfully undertake the Digital Transformation of your organization and define a robust IT Strategy.
Editable Toolkit to help you reuse our content: 700 Powerpoint slides | 35 Excel sheets | 84 minutes of Video training
This PowerPoint presentation is only a small preview of our Toolkits. For more details, visit www.domontconsulting.com
Business Valuation Principles for EntrepreneursBen Wann
This insightful presentation is designed to equip entrepreneurs with the essential knowledge and tools needed to accurately value their businesses. Understanding business valuation is crucial for making informed decisions, whether you're seeking investment, planning to sell, or simply want to gauge your company's worth.
1. ReST vs SOA(P)
yawn ...
Instead ...
Facts and confused metaphors
for Understanding ReST
2. Early Web
• Human edited Files / Document Oriented
programatic output
• A patchy server opening up access to static
files
• Massive Upgrade to Human Knowlege,
Communication, and Transparency
3. Tech Progress
• CGI Scripts
• Screen scrapping clients
• Spiders, Robots, and Internet Duct-tape
• Dynamic HTML
• XHTML & XML formats
• CSS
4. Roy T. Fielding
Architectural Styles and the
Design of Network-based
Software Architectures
http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm
by Paul Downey
5. ReST is not
• A technology
• A set of standards
• COTS software
• A tooth paste
http://www.lostwackys.com/Wacky-Packages/die-cuts/Crust.htm
6. ReST is
• A series of constraints that defines a
specific flavor of system architecture
• Layered
• Client / Server Representational
e
• Code on Demand State
• Client Cache Transfer
• Stateless Server
7. ReST is Weak
Poor network latency
Difficult to identify authoritative response
Uniform Interfaces degrade performance
Lacks “mandatory extensions” - must understand
Optimized for course grained transmissions
Hard to customize
8. but also
ReST is Dope
because of
Low technical barrier to play
General Interfaces
Resource Extensibility
Massively Scalable
Independent Deployment
9. UnReST
Lastly in his Thesis Fielding identifies these issues with HTTP
• Cookies - enabled server side session
• Personalization
• Vendor specific extensions
Did the masses listen to academia?
10. A Common Path
/Server.do?some=stuff
RPC style Sessions
XML-RPC Large Controllers
SOAP Query String Param mappers
Form deserializers
Abstract away the network!
11. A Common Path?
• Focus on APIs, distributed transactions, etc
• Procedural code
• Distributed OOP
1992 called,
it wants it’s
CORBA
back ...
13. ReSTful Web Services?
Madge!
You’re suggesting there’s
issues with transporting
all my SOAP traffic over
POST through one URI?
Relax, SOAP document literal over HTTP
is the most popular.
But won’t I lose transport
independence?
Yes, but if you add using GET, more endpoints,
etc you can have caching for free!
via Shannon C. on Flickr
14. ReST in 90 seconds
• URIs
• Resources
• Representations
• State Transitions
• User agents, intermediaries, and servers
• Uniform Interfaces
16. URI
• Everything has a name
• Excel good C3 = B3 * B2
• Outlook bad - No address for “Last email
from RSDG”
• This presentation is available at
http://www.slideshare.net/ozten/slideshows
17. Resources
• Any “Thing” - concept, event, person
• Anything you would want to point too
• Request or Respose = data + metadata in
an envelope with control data
• Explicit request / response - no hidden
state
• Easier to load balance
• Easier to troubleshoot
18. Representations
• A serializable description of a Resource
• Modify resources through representations
• XHTML Microformats
• Industry standard binary formats ( jpg,
mpg, etc )
• JSON
• XML ( Atom or custom )
• The resource itself for static files
19. State Transitions
Hypermedia as the engine of
• Links
application state
• link, img, and a tags
• Forms
Links and forms are the hypermedia elements of
XHTML. They create the network effect of the web.
Every resource represents a state in your application.
State transition aren’t hidden behind an API, but are
instead transmitted back in forth in a hypermedia
protocol. Client’s can follow these links and be less
fragile to future changes. RPC usually lacks links and
encourages assumptions about formatting URI or
server states.
20. Client / Server
• User Agents
• Web browsers
• HTTP libraries - libwww, libcurl, etc
• Proxies
• Gateways
• Servers
21. Uniform Interfaces
HTTP Method Guarantee # Of Effects
0
GET, HEAD Safe
1
PUT, DELETE Idempotent
POST None ???
Möbius strip via wikipediajpg
22. So What?
Most popular example:
• Stateless Client / Server rules give us
• Client Side Cache
• HTTP 1.1 conditional GET
• Implement Etags, If-Modified-Since
• Real savings time, $, and complexity
24. But, Browsers only do
GET and POST
• Yep, their horrible ReST clients
• Web Developers use XMLHttpRequest for
PUT, DELETE, etc
• Outside of browser, use HttpClient,
libwww, or libcurl
• ReST uniform interface means
you can tunnel PUT, DELETE
over POST or write one off Proxy via cleansweepsupply.com
25. ReST is just CRUD
• Sure you can expose HTTP SQL CRUD
POST INSERT Create
DB on web
GET SELECT Read
• Too cute and simple PUT UPDATE Update
right? DELETE DELETE Delete
It’s about favoring protocols Refactor design to use
and resources over APIs.
new resources if you run
out of HTTP methods
26. Example
Requirment: A user can subscribe to an artist feed
ArtistWS.subscribeUserTo( User user, Feed feed )
POST /subscriptions
OR artist=Art.1234
feed=Feed.2345
email=false
Location: http://foo.com/subscription/Sub.3456
Artist - GET, PUT, DELETE
Feed - GET, PUT, DELETE
Subscription - GET, POST, PUT, DELETE
User - GET, POST, PUT, DELETE
27. We need WSDL for
ReST
• Yes, programmers need documentation and a way
to discover functionality
• ReST gets for free
• Uniform Interface
• Transparent data and HTTP tools
• Explicit state transitions
• Power of XML - XSD, extensibility, etc
28. • WSDL tries to hide network, parsing and
formating messages, loose typing
• Often WSDL is an afterthought, a verbose
format itself, used to generate incredibly
verbose SOAP payloads - Yeah tools!
• Doesn’t actually solve the really hard
problems, still need other WS-* specs
focused on such as transitions or security
29. • ReST still requires you to document your
resources, representations, and other highly
application specific details
• URI, Microformats, XSD, hypermedia, etc let
ReST clients do this in a lightweight manner
• URITemplates, XHTML 5, etc coming
• besides, WSDL2Foo is bad
30. WADL
• Don’t agree that WSDL2Foo is bad?
• OKAY, Use WADL
• WSDL like tool
31. Rare Conceptions
• ReST is nothing more than the web
circa 2003
• Human and programatic web both
thrive under ReST constraints
• It’s the Data, not the Source, not the
API, not the platform
• Mashups and ??? (future emergent techniques)
are easier with ReST
32. Surprise, you’re soaking
in it...
Everything we do
over HTTP is “ReST”,
but we can build
systems that work
with the natural form Call the police! These
of the web APIs are a crime!
33. ReST isn’t your
solution
• If your doing sophisticated mission critical
distributed programming with transactions
across multiple partners in synergistic fashion
• Use CORBA, EDI, Stateful protocol, etc
• Client and server written in Java? Use RMI, Jini,
etc
• Invent a new architecture by applying
constraints to derive a solution that works with
your problem space ala Chapter 5 of Fielding