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What describes a web service according to the definition provided?

  • A middleware solution that requires specific software.
  • A self-contained, modular application accessible over the web. (correct)
  • A proprietary application limited to Java.
  • A high-level programming framework.

    • Which specification is used to define web services?

  • HTTP
  • XML-RPC
  • SOAP
  • WSDL (correct)

    • What role does UDDI play in the context of web services?

  • It serves as a web service discovery mechanism. (correct)
  • It provides a programming interface for web applications.
  • It defines the messaging protocols for web services.
  • It creates self-describing web applications.

    • Which of the following is NOT a key component of a web service?

    <p>Distributed object model</p> Signup and view all the answers

    How does CORBA compare to web services?

    <p>CORBA is standards-based and vendor-neutral.</p> Signup and view all the answers

    Why might someone choose web services over DCOM?

    <p>DCOM is proprietary, limiting its use in diverse environments.</p> Signup and view all the answers

    What is one of the functions of web services on the internet?

    <p>Performing requests and complicated business processes.</p> Signup and view all the answers

    In the context of web services, what does SOAP refer to?

    <p>A messaging protocol for exchanging structured information.</p> Signup and view all the answers

    What is the primary function of a web service after it is deployed?

    <p>It allows other applications to discover and invoke the service.</p> Signup and view all the answers

    Which step is NOT part of the web service invocation process?

    <p>Client generates a new web service.</p> Signup and view all the answers

    How do web services contribute to business processes?

    <p>They provide a standard way to integrate various applications.</p> Signup and view all the answers

    What is a primary advantage of web services in a B2B context?

    <p>Faster time to market for integrating new partners.</p> Signup and view all the answers

    What do dynamic business enablers in web services allow clients to do?

    <p>Piece together unique aggregate services on the fly.</p> Signup and view all the answers

    What role does a web service play as a wrapper for other components?

    <p>It standardizes enterprise applications for web access.</p> Signup and view all the answers

    In what manner can componentized E-services be accessed?

    <p>Asynchronously via their exposed interface.</p> Signup and view all the answers

    What is an essential characteristic of the UDDI registry in web services?

    <p>It allows clients to discover available web services.</p> Signup and view all the answers

    What is a major disadvantage of tightly-coupled systems?

    <p>Significant system changes are difficult.</p> Signup and view all the answers

    What describes the nature of services in a loosely-coupled architecture?

    <p>Agreement on standard wire formats and protocols.</p> Signup and view all the answers

    How do coarse-grained services enhance efficiency in communication?

    <p>By minimizing network round-trips.</p> Signup and view all the answers

    Which statement best characterizes web services' ability to keep track of interactions?

    <p>They maintain a conversational state during asynchronous requests.</p> Signup and view all the answers

    What does vendor-neutral standardization in web services aim to address?

    <p>Lost time with modifying proprietary APIs.</p> Signup and view all the answers

    What is the primary characteristic of a system with long development cycles?

    <p>It incurs high maintenance costs due to poor design.</p> Signup and view all the answers

    What benefit do loosely-coupled services offer over traditional architectures?

    <p>Enhanced reusability and dynamic reconfiguration.</p> Signup and view all the answers

    What scenario exemplifies the utility of a .NET experience?

    <p>Controlling household utilities remotely through a smart device.</p> Signup and view all the answers

    What is a web service primarily characterized by?

    <p>Being self-contained, self-describing, and modular.</p> Signup and view all the answers

    What role does HTTP play in web services?

    <p>It serves as the primary protocol for web service communication.</p> Signup and view all the answers

    Which of the following statements about middleware components is correct?

    <p>Web services act as a façade for accessing non-standardized middleware.</p> Signup and view all the answers

    What is one limitation of web services?

    <p>They cannot utilize the full power and flexibility of the Internet.</p> Signup and view all the answers

    Which standards are commonly associated with XML-based messaging in web services?

    <p>SOAP and XML-RPC.</p> Signup and view all the answers

    What does the web service do after parsing a request?

    <p>It fulfills the request directly or uses a middleware API.</p> Signup and view all the answers

    Which aspect of web services enhances their ability to interact across different systems?

    <p>Their standards-based, vendor-neutral, and language-agnostic features.</p> Signup and view all the answers

    What describes the nature of web services in terms of service provision?

    <p>They can perform simple requests to complex business processes.</p> Signup and view all the answers

    What is one of the primary goals of web services?

    <p>To facilitate collaboration between applications</p> Signup and view all the answers

    What feature of the Java platform makes it suitable for implementing web service applications?

    <p>It is platform independent and vendor neutral</p> Signup and view all the answers

    Which of the following capabilities does JAXB provide?

    <p>Mapping XML elements to Java classes</p> Signup and view all the answers

    Which API is used to send SOAP method calls to remote parties?

    <p>JAX-RPC</p> Signup and view all the answers

    How does Java's polymorphic support benefit web services?

    <p>It facilitates type-based selection of web services at runtime</p> Signup and view all the answers

    What does JAXM provide to Java components?

    <p>An API to send SOAP messages over the Internet</p> Signup and view all the answers

    Which component of the JAX Pack helps in processing XML documents regardless of the parser?

    <p>JAXP</p> Signup and view all the answers

    What does JAXR facilitate for developers?

    <p>Uniform access to business registries over the Internet</p> Signup and view all the answers

    Which property does Java's interface support provide for web services?

    <p>Decoupling of service architecture</p> Signup and view all the answers

    Which statement about web services is true?

    <p>They typically encapsulate existing functions within new interfaces.</p> Signup and view all the answers

    What is the primary function of WSDL in web services?

    <p>It describes the message formats and contact methods for web services.</p> Signup and view all the answers

    Which of the following correctly describes UDDI?

    <p>A yellow pages directory for discovering web services.</p> Signup and view all the answers

    How many layers of abstraction does a WSDL service definition apply?

    <p>Six</p> Signup and view all the answers

    Which element does NOT form part of the WSDL specification?

    <p>Service metadata</p> Signup and view all the answers

    What does UDDI NOT serve as?

    <p>Service Client</p> Signup and view all the answers

    Which of the following companies were involved in the initial development of WSDL?

    <p>IBM, Ariba, and Microsoft</p> Signup and view all the answers

    What role does a Service Provider play in UDDI?

    <p>It publishes e-business web services.</p> Signup and view all the answers

    What is the purpose of WSDL ports in a WSDL definition?

    <p>To combine operations with their respective protocols.</p> Signup and view all the answers

    Study Notes

    Introduction to Internet Computing: Web Services and Standards

    • This course focuses on web services and their standards.
    • Web services are a new type of web application, acting as independent, self-describing, and modular components that can be published, located and used across the web.
    • They can perform various functions, ranging from basic requests to intricate business processes.
    • The goal is to create a structure allowing diverse applications to discover and interact.

    Learning Objectives

    • Understand the service-oriented architecture (SOA) concept related to web services.
    • Learn about the WSDL (Web Services Description Language) specification and how it defines web services.
    • Understand the UDDI (Universal Description, Discovery, and Integration) specification as a mechanism for web service discovery.
    • Gain practical programming examples for web services using Java.

    Outline

    • Definition of a web service.
    • Importance of web services.
    • Integration between Java and web services.
    • WSDL functionality and implementation.
    • UDDI functionality and implementation.

    Web Services Defined

    • Web services are modular web applications, self-contained, self-describing, and deployable across the web.
    • They perform functions ranging from simple operations to complex business processes.
    • Upon deployment, other applications can discover and utilize these deployed services.

    Key Components of Web Services

    • IBM's description highlights self-contained, self-describing modular applications.
    • These elements, published, located, and invoked across the web, also describe the characteristics of web services.
    • The related concepts of object orientation, WSDL, UDDI and SOAP / XML-RPC are tied to the core functionality these components aim to realize.

    Web Services Compared to Existing Middleware

    • Existing middleware solutions like RMI, CORBA, and DCOM have limitations.
    • DCOM is proprietary, hindering interoperability.
    • RMI is tied to Java and less flexible with other languages.
    • CORBA is a more standard-based option, however, it doesn't fully utilize the strengths of the internet.
    • Web services are designed to leverage the service-centric and asynchronous internet.

    Web Services Architecture

    • Web services act as facade/wrapper for complex middleware components.
    • XML requests are sent, processed, and XML responses are returned.
    • SOAP and XML-RPC are standard messaging formats commonly used.
    • HTTP is the primary protocol for web service communication.
    • The client requests a service.
    • The web server interacts with middleware components.

    Web Services Applications

    • A wrapper for different components.
    • Enabling legacy applications.
    • Reducing costs and increasing development speed for enterprise applications.
    • Integrating middleware and legacy applications with a vendor-neutral API.
    • facilitating B2B interactions.
    • enabling extranet portal interactions.
    • E-service componentization.
    • Enabling dynamic business enabling components.

    Java and Web Services

    • Web services are built on industry specifications, to make them language and vendor independent.
    • Java's platform is also based on industry specifications, supporting platform independence, vendor neutrality, extensibility, integration, and simplified connectivity.
    • Java is suited to implement web services due to its vendor neutrality and platform independency.

    Sun's JAX Pack

    • JAXP, JAXB, JAXM, JAXR, JAX-RPC – are components of the Sun Java API for XML Processing / Binding / Messaging / Registries and / or RPC.
    • These provide standards-compliant APIs for complex XML processing and communication.

    WSDL (Web Services Description Language)

    • A standardized XML-based language (IDL-like) describing web services.
    • It declares/describes existing web services and how clients can interact with them.
    • WSDL elements describe data types, messages, operations, and protocols used by the web service.

    UDDI (Universal Description, Discovery, and Integration)

    • A registry service for discovering web services.
    • It provides a method for service providers to publish their services and clients to discover needed services.
    • It structures the service information in an easily searchable manner.
    • UDDI elements, including Business Services, Binding Templates, and TModels. define the service description.

    Web Services Implementation

    • Although web services automate many service interaction details, programming languages are still needed for designing client and server applications.

    Review

    • Recap of Web Services (definition, types, industry, standards), and their key components (WSDL, UDDI).

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