Web services allow software applications to communicate over the World Wide Web through standards such as HTTP and XML. There are two main types of web services: SOAP-based "big" web services which use XML messages and WSDL definitions, and RESTful web services which access networked resources through uniform commands like HTTP and have a simpler architecture. A service-oriented architecture is a collection of services that communicate to deliver added functionality, and web services provide a common way to connect different software applications running on various platforms.
Overview of web services, SOAP, WSDL and UDDI.
A web service provides a defined set of functionality on a machine-processable interface.
The web service interface is described in a formal language like WSDL that allows creating code to access the service thus simplifying web service consumer (client) and provider (server) development.
In big web services, the interface is typically described in WSDL while the access to the service makes use of the SOAP message protocol.
SOAP has its roots in remote object access but is now a general message based and asynchronous transport mechanism.
SOAP is typically carried in HTTP (HyperText Transmission Protocol), but other message based protocols like SMTP (Email) or plain TCP could be used as well.
WSDL provides a formalized description of an interface that is coarsely separated in an abstract service interface definition containing operations and data types, a transport binding that describes how the web service is accessed and finally a description of the location (address) under which a web service is accessible.
UDDI (Universal Description and Discovery Protocol) was meant to become the standard protocol for some kind of a public yellow pages where publicly accessible web services would be listed. Lack of industry interest, however, prevented UDDI to gain widespread use.
Overview of web services, SOAP, WSDL and UDDI.
A web service provides a defined set of functionality on a machine-processable interface.
The web service interface is described in a formal language like WSDL that allows creating code to access the service thus simplifying web service consumer (client) and provider (server) development.
In big web services, the interface is typically described in WSDL while the access to the service makes use of the SOAP message protocol.
SOAP has its roots in remote object access but is now a general message based and asynchronous transport mechanism.
SOAP is typically carried in HTTP (HyperText Transmission Protocol), but other message based protocols like SMTP (Email) or plain TCP could be used as well.
WSDL provides a formalized description of an interface that is coarsely separated in an abstract service interface definition containing operations and data types, a transport binding that describes how the web service is accessed and finally a description of the location (address) under which a web service is accessible.
UDDI (Universal Description and Discovery Protocol) was meant to become the standard protocol for some kind of a public yellow pages where publicly accessible web services would be listed. Lack of industry interest, however, prevented UDDI to gain widespread use.
1. Introduction to Web Services
2. Web Service Architecture
3. What are Web Services?
4. Why are Web Services?
5. The base of WS
6. What is SOAP?
7. What is WSDL?
8. How to test a web service?
9. Examples
1. Introduction to Web Services
2. Web Service Architecture
3. What are Web Services?
4. Why are Web Services?
5. The base of WS
6. What is SOAP?
7. What is WSDL?
8. How to test a web service?
9. Examples
Project - UG - BTech IT - Cluster based Approach for Service Discovery using ...Yogesh Santhan
Abstract— Web services that are appropriate to a user specific request are usually not considered in discovering the exact service since they are present without explicit related semantic descriptions. In our approach, we deal with the issue of service discovery provided non-explicit service description semantics that match a particular service request. We propose a system that involves semantic-based service categorization which is performed at the UDDI with a key for achieving the service categorization at functional level based on an ontology skeleton. Also, clustering is used for literally systemizing the web services based on functionality which is achieved by using analytic algorithm. An efficient matching for the relevant services is achieved by the enhancing the service request semantically and involves expanding the additional functionality (obtained from ontology) that are related for the requested service. The pattern recognition algorithm is used to select appropriate service from the cluster formation of related (grouped) web services.
This is my UG Final Year Project - BTech Information Technology.
A distributed system is a collection of computational and storage devices connected through a communications network. In this type of system, data, software, and users are distributed.
Service Oriented Software Engineering: Services as reusable components, Service Engineering, Software Development with Services. Service-oriented architectures, RESTful services
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
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
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.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
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.
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.
Elevating Tactical DDD Patterns Through Object CalisthenicsDorra BARTAGUIZ
After immersing yourself in the blue book and its red counterpart, attending DDD-focused conferences, and applying tactical patterns, you're left with a crucial question: How do I ensure my design is effective? Tactical patterns within Domain-Driven Design (DDD) serve as guiding principles for creating clear and manageable domain models. However, achieving success with these patterns requires additional guidance. Interestingly, we've observed that a set of constraints initially designed for training purposes remarkably aligns with effective pattern implementation, offering a more ‘mechanical’ approach. Let's explore together how Object Calisthenics can elevate the design of your tactical DDD patterns, offering concrete help for those venturing into DDD for the first time!
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
Key Trends Shaping the Future of Infrastructure.pdfCheryl Hung
Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
Sr Director, Infrastructure Ecosystem, Arm.
The key trends across hardware, cloud and open-source; exploring how these areas are likely to mature and develop over the short and long-term, and then considering how organisations can position themselves to adapt and thrive.
2. What are Web Services
Web services are client and server applications that communicate over the
World Wide Web’s (WWW) Hypertext Transfer Protocol (HTTP).
As described by the World Wide Web Consortium (W3C), web services
provide a standard means of interoperating between software applications
running on a variety of platforms and frameworks. Web services are
characterized by their great interoperability and extensibility, as well as their
machine-processable descriptions, thanks to the use of XML.
Web services can be combined in a loosely coupled way to achieve complex
operations. Programs providing simple services can interact with each other
to deliver sophisticated added-value services.
3. Service Oriented Architecture (SOA)
A service-oriented architecture is essentially a collection of services. These
services communicate with each other. The communication can involve either
simple data passing or it could involve two or more services coordinating
some activity.
Some means of connecting services to each other is needed.
Service-oriented architectures are not a new thing. The first service-oriented
architecture for many people in the past was with the use DCOM or Object
Request Brokers (ORBs) based on the CORBA specification.
4. Service
If a service-oriented architecture is to be effective, we need a clear
understanding of the term service. A service is a function that is well-
defined, self-contained, and does not depend on the context or state of
other services
Services are what you connect together using Web Services. A service is the
endpoint of a connection. Also, a service has some type of underlying
computer system that supports the connection offered. This section
provides information on the specification of services.
“a service is a type of API, usually over HTTP”
You may have an API, but not expose it to anybody external.
“a service is a proxy of your internal logic, which is exposed to the outside
world”
Think of the analogy of “views” in database systems.
5. Connections
The technology of Web Services is the most likely connection technology of
service-oriented architectures. The following figure illustrates a basic service-
oriented architecture. It shows a service consumer at the right sending a service
request message to a service provider at the left. The service provider returns a
response message to the service consumer. The request and subsequent response
connections are defined in some way that is understandable to both the service
consumer and service provider.
6. Introduction to Service Oriented Computing
-Context of WebServices: Distributed Information Systems
Layers of an information system
Presentation layer
Communication interface to external entities
Graphical user interface for human users or non
graphical user interface for other programs
Application logic layer
Implements operations requested by clients
through the presentation layer
Resource management layer
Deals with different data sources of an
information system
Distributed systems are split up into parts
Run simultaneously on multiple computers
Communicate over a network
Client
Resource Management
Layer
Application Logic Layer
Presentation layer
7. Machine to machine communication
-Getting applications to talk to each other
Client
Resource Management
Layer
Application Logic Layer
Presentation layer
Client
Resource Management
Layer
Application Logic Layer
Presentation layer
Application Logic Layer
8. Example: Yield management in the airline industry requires close system
interaction in order to retrieve the most current prices
Windows Server 2008 UNIX System
Travel Information and
Booking Application
(programmed in Java)
Flight Information and
Booking Application
(programmed in C)
Seamless
Interaction
Mismatch in operating system, language, platform, etc.
Service-oriented computing is an emergent paradigm that helps to
overcome these mismatches
9. Windows Server 2008 UNIX System
Travel Information and
Booking Application
(programmed in Java)
Flight Information and
Booking Application
(programmed in C)
Request
Response
10. Service Vs WebService
Services are business functions which an enterprise offers to its business
Partners
A possible implementation of Services are Web Services
However, other concepts may also be used to implement a Service, e.g.,
ebXML, document-centric approaches using EDI messages, etc.
11. Important terms in SOA
(Web) Services are self-contained modules that can be described, published,
located, orchestrated, and programmed using XML-based technologies over a
Network.
Service providers are organizations that provide the service implementations,
supply their service descriptions, and provide related technical and business
Support.
Service clients are end-users and organizations that use some service.
Service aggregators are organizations that consolidate multiple services into a
new, single orchestrated service offering that is commonly known as business
process.
A service-oriented architecture (SOA) is a logical way of designing a software
system to provide services to either end-user applications or to other services
distributed in a network, via published and discoverable interfaces.
12. Types of Web Services
On the conceptual level, a service is a software component provided through a
network-accessible endpoint. The service consumer and provider use messages
to exchange invocation request and response information in the form of self-
containing documents that make very few assumptions about the technological
capabilities of the receiver.
On a technical level, web services can be implemented in various ways. The two
types of web services discussed in this section can be distinguished as “big” web
services (SOAP) and “RESTful” web services.
13. SOAP provides the envelope for sending Web Services messages over the
Internet/Internet. It is part of the set of standards specified by the W3C. SOAP is an
alternative to Representational State Transfer (REST) and JavaScript Object Notation
(JSON).
The SOAP envelope contains two parts:
An optional header providing information on
authentication, encoding of data, or how a recipient
of a SOAP message should process the message.
The body that contains the message. These
messages can be defined using the WSDL
specification.
SOAP commonly uses HTTP, but other protocols such
as Simple Mail Transfer Protocol (SMTP) may by used.
SOAP can be used to exchange complete documents
or to call a remote procedure.
NOTE: SOAP at one time stood for Simple Object
Access Protocol. Starting with SOAP Version 1.2, the
letters in the acronym have no particular meaning.
Simple Object Access Protocol(SOAP)
14. SOAP
SOAP was originally part of the specification that included the Web Services
Description Language (WSDL) and Universal Description, Discovery, and
Integration (UDDI). It is used now without WSDL and UDDI. Instead of the
discovery process, SOAP messages are hard-coded or generated without the
use of a repository. The interaction is illustrated in the figure below.
15. “Big” Web Services(SOAP Based)
Big web services use XML messages that follow the Simple Object Access Protocol (SOAP)
standard, an XML language defining a message architecture and message formats. Such
systems often contain a machine-readable description of the operations offered by the
service, written in the Web Services Description Language (WSDL), an XML language for
defining interfaces syntactically.
The SOAP message format and the WSDL interface definition language have gained
widespread adoption. Many development tools, such as NetBeans IDE, can reduce the
complexity of developing web service applications.
16. Representational State Transfer (REST)
Representational State Transfer (REST) is a style of architecture based on a set of
principles that describe how networked resources are defined and addressed. These
principles were first described in 2000 by Roy Fielding as part of his doctoral
dissertation.
REST is an alternative to SOAP and JavaScript Object Notation (JSON).
It is important to note that REST is a style of software architecture as opposed to a set
of standards. As a result, such applications or architectures are sometimes referred to
as RESTful or REST-style applications or architectures. REST has proved to be a
popular choice for implementing Web Services. It is one of the options for Amazon
Web Services
An application or architecture considered RESTful or REST-style is characterized by:
State and functionality are divided into distributed resources.
Every resource is uniquely addressable using a uniform and minimal set of
commands (typically using HTTP commands of GET, POST, PUT, or DELETE over the
Internet)
The protocol is client/server, stateless, layered, and supports caching
This is essentially the architecture of the Internet and helps to explain the popularity
and ease-of-use for REST
17. REST
Representation State Transfer (REST) appeals to developers because it has a
simpler style that makes it easier to use than SOAP. It also less verbose so that
less volume is sent when communicating.
18. RESTful Web Services
In Java EE 6, JAX-RS provides the functionality for Representational State
Transfer (RESTful) web services. REST is well suited for basic, ad hoc integration
scenarios. RESTful web services, often better integrated with HTTP than SOAP-
based services are, do not require XML messages or WSDL service–API
definitions.
Project Jersey is the production-ready reference implementation for the JAX-RS
specification. Jersey implements support for the annotations defined in the JAX-
RS specification, making it easy for developers to build RESTful web services
with Java and the Java Virtual Machine (JVM).
Because RESTful web services use existing well-known W3C and Internet
Engineering Task Force (IETF) standards (HTTP, XML, URI, MIME) and have a
lightweight infrastructure that allows services to be built with minimal tooling,
developing RESTful web services is inexpensive and thus has a very low barrier
for adoption. You can use a development tool such as NetBeans IDE to further
reduce the complexity of developing RESTful web services.
19. JavaScript Object Notation (JSON)
JavaScript Object Notation (JSON) uses name/value pairs. This is similar to the
tags used by XML. An example from the figure below shows, at the left, the XML
tag of "<state>" with the value of "MN." The pairs for JSON are at the right. It
similarly shows the name "state" is paired with the value "MN." The name/value
pairs do not need to be in a specific order. Also, like XML, JSON provides
resilience to changes and avoids the brittleness of fixed record formats.
20. While both SOAP and REST use XML for interchange, JavaScript Object Notation
(JSON) uses a subset of JavaScript. This is illustrated in the figure below.
21. Characteristics of Web Services
WS semantically encapsulate discrete functionality
A Web Service is a self contained software module that performs a single task
(e.g. weather forecast by passing the zip-code as parameter)
WS share a contract
In order to allow interaction of services, a formal contract must be established,
that defines the exact terms of an information exchange between a service client
and a service provider
WS abstract underlying program logic
A service exposes a certain functionality to a client. How that functionality is
achieved (e.g., which program language is used, or which database is used)
remains invisible to the caller)
WS are loosely coupled software modules
A service interface is defined in a neutral manner, independent of the
underlying platform, operating system, or programming language
Due to their neutral interfaces, services are not hard-wired. Thus, a service may
be easily exchanged by another service, without much implementation effort
22. WS are reusable
A service may be reused by multiple applications
WS can be dynamically found and included in applications
A WS provides programmable access. Thus, a WS may be embedded in a
remotely located application, i.e., a service may be composed.
Unlike Web Sites, Web Services are not targeted at human users
They are called by and exchange data with other software modules and
applications.
WS are described in terms of a standard description language
Web Service Description Language (WSDL) and Web Application Description
Language (WADL) describe functional service characteristics
Functional requirements: Requirements of the functionality which must be
provided (Functions, Data, Behaviour, etc.)
Non-functional requirements: Requirements of the circumstances under which the
functionality must be provided (e.g., reliability, performance, etc.)
WS are distributed over the Internet
WS make use of existing ubiquitous transport Internet protocols like HTTP
By relying on the same well-understood transport mechanism as Web Content,
Web Services may leverage existing infrastructures and may cross corporate
firewalls.
23. Operations in a Web Service
Architecture
Publish
A service description needs to be published such that
the service requestor can find it
it is accessible
Find
The service requestor retrieves the service description
directly
by querying a service registry
Bind
The service requestor invokes or instantiates the interaction with the
service by using binding details in the service description to locate,
contact,
and invoke the service.