This document discusses media types in RESTful applications. It defines what a media type is, including that it has a name, family of compatible schemas, hypermedia semantics, and processing rules. It discusses how to design a media type, including defining extensible schemas and avoiding mandatory elements. It also explains how media types enable evolvability by limiting contract changes to adding or removing data and controls while clients can ignore unknown elements. This allows services, clients, and contracts to evolve independently through loose coupling.
DEVNET-1009 Cisco Intercloud Fabric for Business (ICFB), Helping Enterprises...Cisco DevNet
Several enterprises find themselves wondering how to use public cloud resources while maintaining security, consistent network policies and avoid cloud vendor lock-in. This session will introduce Cisco Intercloud Fabric (ICF) and how it provides a single pane of glass to manage hybrid cloud infrastructure. By extending enterprise network onto public cloud, Cisco ICF enables customers to have the same level of security on public cloud as is present in their private cloud.
On August 27th, VMware dropped some big announcements at VMworld 2012 – Specifically around the new vSphere 5.1 changes, and how they’ll impact you. View this presentation where our VMware team takes our customers through these important changes.
Personality Types of Social Media Users: A sketch and overview of why personalities matter on social media. A look at several different personality types.
DEVNET-1009 Cisco Intercloud Fabric for Business (ICFB), Helping Enterprises...Cisco DevNet
Several enterprises find themselves wondering how to use public cloud resources while maintaining security, consistent network policies and avoid cloud vendor lock-in. This session will introduce Cisco Intercloud Fabric (ICF) and how it provides a single pane of glass to manage hybrid cloud infrastructure. By extending enterprise network onto public cloud, Cisco ICF enables customers to have the same level of security on public cloud as is present in their private cloud.
On August 27th, VMware dropped some big announcements at VMworld 2012 – Specifically around the new vSphere 5.1 changes, and how they’ll impact you. View this presentation where our VMware team takes our customers through these important changes.
Personality Types of Social Media Users: A sketch and overview of why personalities matter on social media. A look at several different personality types.
Are you facing some, or all, of these challenges?
-Host Mobility (w/o stretching VLANs)
-Network Segmentation (w/o implementing MPLS)
-Roles-based Access Control (w/o end-to-end TrustSec)
-Common Policy for Wired and Wireless (w/o multiple tools)
Using Cisco technologies already available today, you can overcome these challenges and build an evolved Campus network to better meet your business objectives.
Nagios Conference 2012 - Andreas Ericsson - MerlinNagios
Andreas Ericsson's presentation on using Nagios with Merlin.
The presentation was given during the Nagios World Conference North America held Sept 25-28th, 2012 in Saint Paul, MN. For more information on the conference (including photos and videos), visit: http://go.nagios.com/nwcna
Thesis presentation: Middleware for Ubicomp - A Model Driven Development Appr...Till Riedel
With computers that will be interwoven into almost every industrial product like its nervous system (Steinbuch, 1966) we are already approaching what Weiser (1991) called Ubiquitous Computing, in terms of quantity, degree of embedding of computing systems in our life and work environment.
This thesis investigates model driven software development (MDSD) approach as a tool for contextual adaption of ubiquitous systems. Ubiquitous Systems (i.e. the embedded devices) are subject to changes that affect the execution of software. The systems are very heterogeneous and and the designer has to take a diverse set of plattforms and ressource constrained hardware into consideration.
By implementing a model driven development techniques for core problems of ubiquitous computing, namely distributed execution and heterogeneous communication in ubiquitous systems the work demonstrates that Model Driven Software Development of Ubiquitous Systems maybe used to solve the inherent contradiction between top-down and bottom-up development of networked embedded systems.
6° Sessione VMware NSX: la piattaforma di virtualizzazione della rete per il ...Jürgen Ambrosi
La piattaforma di virtualizzazione NSX sta già aiutando centinaia di clienti a sfruttare tutte le potenzialità di un Software-Defined Data Center. NSX sposta la rete nel software, creando livelli di flessibilità mai raggiunti prima d'ora. In altre parole, trasforma il modello operativo della rete deldata center così come la virtualizzazione del server ha fatto 10 anni fa. NSX inoltre integra la sicurezza con policy granulari e automatizzate legate alle macchine virtuali, funzionalità chiamata micro-segmentazione, che consente di ridurre in modo significativo la diffusione delle minacce. Rendendo la micro-segmentazione della rete possibile dal punto di vista operativo, NSX introduce un modello di sicurezza di livello superiore, impossibile da realizzare con tecniche tradizionali. Questa sessione da l’opportunità di approfondire il tema della virtualizzazione della rete possibile con VMware NSX, evidenziandone i benefici: riduzione dei tempi di provisioning, semplificazione del delivery dei servizi di rete, incremento della sicurezza con la micro-segmentazione.
Simplifying SDN Networking Across Private and Public Clouds5nine
This presentation everything you need to know about SDN architectures including the following topics:
- 5 Essential Elements of SDN architectures
- 6 Business benefits of software-defined network solutions
- Why software-defined networking is the future of legacy data centers
**Originally published here: https://info.5nine.com/webinar-sdn-management-and-security-best-practices
Revealing the State of Network Configuration Management & Automation in the E...Itential
Enterprise IT organizations are striving for improvements in agility and security to meet business needs aligned to strategies and objectives. For their part, IT infrastructure and operations teams are turning to network automation solutions to realize these gains. But the reality is that most network professionals lack confidence in their networks’ ability to adhere to best configuration standards, casting doubt on their ability to automate it without the introduction of more errors.
Recently, Itential conducted new research in partnership with Enterprise Management Associates, surveying over 1,000 IT professionals who are responsible for managing networks that reveals the state of network configuration management and automation in the enterprise.
Here are some of the key insights uncovered in this research to help enterprises tackle their network automation initiatives, while feeling confident their network is secure, including:
• Current state of network automation in the enterprise and why configuration management is a key factor to success.
• Top challenges enterprises face when seeking to automate their networks and how they are overcoming them.
• How organizations must think about their automation strategy and approach to selecting the right tools to realize true value.
Moderator:
Chris Grundemann, Network Automation Forum
Speakers:
Jeff Loughridge, Konekti Systems
Mark Ciecior, Carrier Access IT
William Collins, Alkira
Visualizing Your Network Health - Driving Visibility in Increasingly Complex...DellNMS
Dell Performance Monitoring Network Management solutions can provide your IT department with the affordable, in-depth visibility and actionable monitoring needed to manage network infrastructure complexity.
Join our webcast to learn how:
• Dynamic discovery of equipment provides the ability to map current location, configuration and interdependencies.
• Real-time visibility across network infrastructures can help ensure availability and performance.
• Actionable information about network health, faults, bandwidth hogs and performance issues reduces the mean-time-to-resolution.
• Proactive analysis can pinpoint the root cause of intermittent, hard to find problems.
Visualizing and optimizing your network is easier than you think
Grid Middleware – Principles, Practice and PotentialPaul Brebner
A presentation I gave at UCL, while I was managing the UK OGSA Evaluation Project in 2004, while I was on leave from CSIRO, at UCL Computer Science department, working with Wolfgang Emmerich.
Paul Brebner, University College London, Computer Science Department Seminar: "Grid Middleware - Principles, Practice, and Potential", 1 November 2004.
The project page was still here (2020): http://sse.cs.ucl.ac.uk/UK-OGSA/
How can we rewrite our application to handle new challenges coming from applications that need to scale over the cloud? Use patterns, so you can use the best technology at every tier
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
More Related Content
Similar to Understanding the Role of Media Types in RESTful applications
Are you facing some, or all, of these challenges?
-Host Mobility (w/o stretching VLANs)
-Network Segmentation (w/o implementing MPLS)
-Roles-based Access Control (w/o end-to-end TrustSec)
-Common Policy for Wired and Wireless (w/o multiple tools)
Using Cisco technologies already available today, you can overcome these challenges and build an evolved Campus network to better meet your business objectives.
Nagios Conference 2012 - Andreas Ericsson - MerlinNagios
Andreas Ericsson's presentation on using Nagios with Merlin.
The presentation was given during the Nagios World Conference North America held Sept 25-28th, 2012 in Saint Paul, MN. For more information on the conference (including photos and videos), visit: http://go.nagios.com/nwcna
Thesis presentation: Middleware for Ubicomp - A Model Driven Development Appr...Till Riedel
With computers that will be interwoven into almost every industrial product like its nervous system (Steinbuch, 1966) we are already approaching what Weiser (1991) called Ubiquitous Computing, in terms of quantity, degree of embedding of computing systems in our life and work environment.
This thesis investigates model driven software development (MDSD) approach as a tool for contextual adaption of ubiquitous systems. Ubiquitous Systems (i.e. the embedded devices) are subject to changes that affect the execution of software. The systems are very heterogeneous and and the designer has to take a diverse set of plattforms and ressource constrained hardware into consideration.
By implementing a model driven development techniques for core problems of ubiquitous computing, namely distributed execution and heterogeneous communication in ubiquitous systems the work demonstrates that Model Driven Software Development of Ubiquitous Systems maybe used to solve the inherent contradiction between top-down and bottom-up development of networked embedded systems.
6° Sessione VMware NSX: la piattaforma di virtualizzazione della rete per il ...Jürgen Ambrosi
La piattaforma di virtualizzazione NSX sta già aiutando centinaia di clienti a sfruttare tutte le potenzialità di un Software-Defined Data Center. NSX sposta la rete nel software, creando livelli di flessibilità mai raggiunti prima d'ora. In altre parole, trasforma il modello operativo della rete deldata center così come la virtualizzazione del server ha fatto 10 anni fa. NSX inoltre integra la sicurezza con policy granulari e automatizzate legate alle macchine virtuali, funzionalità chiamata micro-segmentazione, che consente di ridurre in modo significativo la diffusione delle minacce. Rendendo la micro-segmentazione della rete possibile dal punto di vista operativo, NSX introduce un modello di sicurezza di livello superiore, impossibile da realizzare con tecniche tradizionali. Questa sessione da l’opportunità di approfondire il tema della virtualizzazione della rete possibile con VMware NSX, evidenziandone i benefici: riduzione dei tempi di provisioning, semplificazione del delivery dei servizi di rete, incremento della sicurezza con la micro-segmentazione.
Simplifying SDN Networking Across Private and Public Clouds5nine
This presentation everything you need to know about SDN architectures including the following topics:
- 5 Essential Elements of SDN architectures
- 6 Business benefits of software-defined network solutions
- Why software-defined networking is the future of legacy data centers
**Originally published here: https://info.5nine.com/webinar-sdn-management-and-security-best-practices
Revealing the State of Network Configuration Management & Automation in the E...Itential
Enterprise IT organizations are striving for improvements in agility and security to meet business needs aligned to strategies and objectives. For their part, IT infrastructure and operations teams are turning to network automation solutions to realize these gains. But the reality is that most network professionals lack confidence in their networks’ ability to adhere to best configuration standards, casting doubt on their ability to automate it without the introduction of more errors.
Recently, Itential conducted new research in partnership with Enterprise Management Associates, surveying over 1,000 IT professionals who are responsible for managing networks that reveals the state of network configuration management and automation in the enterprise.
Here are some of the key insights uncovered in this research to help enterprises tackle their network automation initiatives, while feeling confident their network is secure, including:
• Current state of network automation in the enterprise and why configuration management is a key factor to success.
• Top challenges enterprises face when seeking to automate their networks and how they are overcoming them.
• How organizations must think about their automation strategy and approach to selecting the right tools to realize true value.
Moderator:
Chris Grundemann, Network Automation Forum
Speakers:
Jeff Loughridge, Konekti Systems
Mark Ciecior, Carrier Access IT
William Collins, Alkira
Visualizing Your Network Health - Driving Visibility in Increasingly Complex...DellNMS
Dell Performance Monitoring Network Management solutions can provide your IT department with the affordable, in-depth visibility and actionable monitoring needed to manage network infrastructure complexity.
Join our webcast to learn how:
• Dynamic discovery of equipment provides the ability to map current location, configuration and interdependencies.
• Real-time visibility across network infrastructures can help ensure availability and performance.
• Actionable information about network health, faults, bandwidth hogs and performance issues reduces the mean-time-to-resolution.
• Proactive analysis can pinpoint the root cause of intermittent, hard to find problems.
Visualizing and optimizing your network is easier than you think
Grid Middleware – Principles, Practice and PotentialPaul Brebner
A presentation I gave at UCL, while I was managing the UK OGSA Evaluation Project in 2004, while I was on leave from CSIRO, at UCL Computer Science department, working with Wolfgang Emmerich.
Paul Brebner, University College London, Computer Science Department Seminar: "Grid Middleware - Principles, Practice, and Potential", 1 November 2004.
The project page was still here (2020): http://sse.cs.ucl.ac.uk/UK-OGSA/
How can we rewrite our application to handle new challenges coming from applications that need to scale over the cloud? Use patterns, so you can use the best technology at every tier
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Unlocking Productivity: Leveraging the Potential of Copilot in Microsoft 365, a presentation by Christoforos Vlachos, Senior Solutions Manager – Modern Workplace, Uni Systems
Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
https://alandix.com/academic/papers/synergy2024-epistemic/
As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
Generative AI Deep Dive: Advancing from Proof of Concept to ProductionAggregage
Join Maher Hanafi, VP of Engineering at Betterworks, in this new session where he'll share a practical framework to transform Gen AI prototypes into impactful products! He'll delve into the complexities of data collection and management, model selection and optimization, and ensuring security, scalability, and responsible use.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
Communications Mining Series - Zero to Hero - Session 1DianaGray10
This session provides introduction to UiPath Communication Mining, importance and platform overview. You will acquire a good understand of the phases in Communication Mining as we go over the platform with you. Topics covered:
• Communication Mining Overview
• Why is it important?
• How can it help today’s business and the benefits
• Phases in Communication Mining
• Demo on Platform overview
• Q/A
GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using Deplo...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Observability Concepts EVERY Developer Should Know -- DeveloperWeek Europe.pdfPaige Cruz
Monitoring and observability aren’t traditionally found in software curriculums and many of us cobble this knowledge together from whatever vendor or ecosystem we were first introduced to and whatever is a part of your current company’s observability stack.
While the dev and ops silo continues to crumble….many organizations still relegate monitoring & observability as the purview of ops, infra and SRE teams. This is a mistake - achieving a highly observable system requires collaboration up and down the stack.
I, a former op, would like to extend an invitation to all application developers to join the observability party will share these foundational concepts to build on:
Sudheer Mechineni, Head of Application Frameworks, Standard Chartered Bank
Discover how Standard Chartered Bank harnessed the power of Neo4j to transform complex data access challenges into a dynamic, scalable graph database solution. This keynote will cover their journey from initial adoption to deploying a fully automated, enterprise-grade causal cluster, highlighting key strategies for modelling organisational changes and ensuring robust disaster recovery. Learn how these innovations have not only enhanced Standard Chartered Bank’s data infrastructure but also positioned them as pioneers in the banking sector’s adoption of graph technology.
GridMate - End to end testing is a critical piece to ensure quality and avoid...ThomasParaiso2
End to end testing is a critical piece to ensure quality and avoid regressions. In this session, we share our journey building an E2E testing pipeline for GridMate components (LWC and Aura) using Cypress, JSForce, FakerJS…
Alt. GDG Cloud Southlake #33: Boule & Rebala: Effective AppSec in SDLC using ...James Anderson
Effective Application Security in Software Delivery lifecycle using Deployment Firewall and DBOM
The modern software delivery process (or the CI/CD process) includes many tools, distributed teams, open-source code, and cloud platforms. Constant focus on speed to release software to market, along with the traditional slow and manual security checks has caused gaps in continuous security as an important piece in the software supply chain. Today organizations feel more susceptible to external and internal cyber threats due to the vast attack surface in their applications supply chain and the lack of end-to-end governance and risk management.
The software team must secure its software delivery process to avoid vulnerability and security breaches. This needs to be achieved with existing tool chains and without extensive rework of the delivery processes. This talk will present strategies and techniques for providing visibility into the true risk of the existing vulnerabilities, preventing the introduction of security issues in the software, resolving vulnerabilities in production environments quickly, and capturing the deployment bill of materials (DBOM).
Speakers:
Bob Boule
Robert Boule is a technology enthusiast with PASSION for technology and making things work along with a knack for helping others understand how things work. He comes with around 20 years of solution engineering experience in application security, software continuous delivery, and SaaS platforms. He is known for his dynamic presentations in CI/CD and application security integrated in software delivery lifecycle.
Gopinath Rebala
Gopinath Rebala is the CTO of OpsMx, where he has overall responsibility for the machine learning and data processing architectures for Secure Software Delivery. Gopi also has a strong connection with our customers, leading design and architecture for strategic implementations. Gopi is a frequent speaker and well-known leader in continuous delivery and integrating security into software delivery.
Climate Impact of Software Testing at Nordic Testing DaysKari Kakkonen
My slides at Nordic Testing Days 6.6.2024
Climate impact / sustainability of software testing discussed on the talk. ICT and testing must carry their part of global responsibility to help with the climat warming. We can minimize the carbon footprint but we can also have a carbon handprint, a positive impact on the climate. Quality characteristics can be added with sustainability, and then measured continuously. Test environments can be used less, and in smaller scale and on demand. Test techniques can be used in optimizing or minimizing number of tests. Test automation can be used to speed up testing.
Essentials of Automations: The Art of Triggers and Actions in FMESafe Software
In this second installment of our Essentials of Automations webinar series, we’ll explore the landscape of triggers and actions, guiding you through the nuances of authoring and adapting workspaces for seamless automations. Gain an understanding of the full spectrum of triggers and actions available in FME, empowering you to enhance your workspaces for efficient automation.
We’ll kick things off by showcasing the most commonly used event-based triggers, introducing you to various automation workflows like manual triggers, schedules, directory watchers, and more. Plus, see how these elements play out in real scenarios.
Whether you’re tweaking your current setup or building from the ground up, this session will arm you with the tools and insights needed to transform your FME usage into a powerhouse of productivity. Join us to discover effective strategies that simplify complex processes, enhancing your productivity and transforming your data management practices with FME. Let’s turn complexity into clarity and make your workspaces work wonders!
SAP Sapphire 2024 - ASUG301 building better apps with SAP Fiori.pdfPeter Spielvogel
Building better applications for business users with SAP Fiori.
• What is SAP Fiori and why it matters to you
• How a better user experience drives measurable business benefits
• How to get started with SAP Fiori today
• How SAP Fiori elements accelerates application development
• How SAP Build Code includes SAP Fiori tools and other generative artificial intelligence capabilities
• How SAP Fiori paves the way for using AI in SAP apps
73. Automatically check
prices and place order if
price is below threshold
User
Shop A
User Agent
(Crawler)
Shop B
74. UC 01: Automatically check prices and...
Primary Actor: User (Buyer)
Precondition: Crawler knows catalog entry URIs
Main Success Scenario:
1. User starts crawler
2. Crawler requests catalogs of known shops
3. Crawler compares prices of items to threshold
4. Crawler selects item if price below threshold
5. Crawler creates order for item
6. Crawler submits order to order-processor
7. Crawler archives order response
8. User reviews archived order responses
75. UC 01: Automatically check prices and...
Primary Actor: User (Buyer)
Precondition: Crawler knows catalog entry URIs
Main Success Scenario:
1. User starts crawler
2. Crawler requests catalogs of known shops
3. Crawler compares prices of items to threshold
4. Crawler selects item if price below threshold
5. Crawler creates order for item
6. Crawler submits order to order-processor
7. Crawler archives order response
8. User reviews archived order responses
76. Elements of Example
Media Type
Data:
Catalog (with items)
Order (with order-items)
Order Response
Hypermedia controls:
Order-Processor
(Catalog)
78. Order Example
<order>
<buyer>...</buyer>
<line-items>
<line-item id=”123”>
<price currency=”EUR”>27.99</price>
<quantity>4</quantity>
</line-item>
<line-item id=”456”>
<price currency=”EUR”>12.95</price>
<quantity>4</quantity>
</line-item>
</line-items>
</order>
79. application/procurement
•Three schemas <catalog>, <order> and
<order-response>
•No mandatory elements
•Extensible
•Specified as version 1
•Processing Rules
If an <order-processor> element is present an order can be POSTed to that resource.
Such an oder accepting resource SHOULD accept <order>-documents.
...
110. If you are a client developer...
•Use from the media type what suits your
intended application
111. If you are a client developer...
•Use from the media type what suits your
intended application
•Ignore unknown data and controls
112. If you are a client developer...
•Use from the media type what suits your
intended application
•Ignore unknown data and controls
•“What if” programming style
Upper four rather well understood by now. Mostly, people get the caching right, apply statelessness to invoke scalability.\n\nEvolvability is often ignored when REST is applied - although it is one of the key benefits of REST.\n
Evolvability however seems to be ignored most of the times REST is applied.\n\nWhy is it so important?\n\nChange is inevitable to support new requirements. But it is difficult and costly to change a service when we have to coordinate that change with client owners. Especially if there are many clients that are difficult to reach.\n
No coordination with clients necessary - Amazon never calls\n\nNo running application (e.g. an ongoing online purchase) has to be aborted\n\nHow can we reach that goal?\n\nLook at how communication between components works...\n
Communication requires contract.\n\nTraditionally contract is owned by server.\n\nWhen server evolves it changes the contract.\n\nCoordination with clients necessary to apply changed contract.\n\nThe more clients there are and the more difficult it is to reach them the more difficult and costly is such a contract change.\n\n\n
REST moves contract to global space.\n\nServer does not own contract anymore.\n\nServer cannot change the contract.\n\nServer change needs to take place within the bounds of the contract.\n\n\nThis is where media types come in: REST introduces media types to serve as the global contract of communication.\n\nIn order to understand how REST achieves the evolvability goal we need to look at the question:\n\nHow do media types provide a contract that is flexible enough to allow the server to change but still contract enough to allow communication.\n\nThe rest of the talk is looking into three questions around media types:\n\n
\n
\n
\n
Use HTML as an example\n
Use HTML as an example\n
Use HTML as an example\n
Use HTML as an example\n
Use HTML as an example\n
The media type must enable the execution of a canonical use case.\n\nTransfer data and control.\n\n
Explain use case.\n
Use written use cases to drive media type design.\n
Extract data and hypermedia controls from use case text scenario text.\n
Elements derived from written use case.\n\n
\n
\n
We define our media type application/procurement as follows.\n\nWe have now designed an example media type\n
Recall the problem - server does not own contract so change has to happen within that contract.\n\nlook at how it serves the problem of communication bewtween c und s\n\nsince we do not communicate, media type as the contract must tell everything. and enable the evolution of the server.\n\nSo, let&#x2019;s implement the shop server...\n
Silly catalog returning resource - but is that wrong?\n
\n
Better - but on what basis did we do that?\n
Media type provides a set of available data and control elements and combination rules.\n\nServer developers implement the service for a certain purpose. Pick from the media type what suits that purpose.\n\nAka common sense...\n
the question really is: why do we programm this this way? What is driving us since the media type does not really tell us.\n
Why did we implement the crawler in this way?\n\nMedia type provides idea of &#x2018;set&#x2019; of possible applications.\n\n\n
Media type provides a set of available data and control elements and combination rules.\n\nMedia type provides an understanding of the canonical behavior of the service. Apply that to your intended application.\n\nHow can I realize my intended application using the media type.\n\nThere might be other media types for which I also do this.\n\nIf you give me media type X I can solve my application if all my What-Ifs hold true.\n
Timing assumptions, for example are uniform.\n
Add in-stock quantity to items.\n\nFor example to build an HTML page for a shop from catalog data.\n
Not a problem from the point of view of the media type\n
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If they turn out to be useful to others, add extensions to the media type to share them with others. This is how the media type evolves over time.\n
Suppose we have to return from some shop a catalog without an order processor.\n\n
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This will fail because the existence of the hypermedia control is blindly assumed. Yet it can&#x2019;t.\n\n\n
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Error handling\n
Don&#x2019;t assume that something will happen that you cannot control.\n
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A contract that is flexible enough to allow the server to change yet contract enough to allow enable communication.\n
Client and server developers use media types to learn what to expect and what to possibly provide.\n\nClient developers need to match their intended application to the data and control elements provided.\n\nServer developers need to match their intended exposed capabilities to the data and controls provided.\n