INTRODUCTION TO SERVICE-ORIENTED ARCHITECTURES in VS .NET

Printing ANSI/AIM Code 39 in VS .NET INTRODUCTION TO SERVICE-ORIENTED ARCHITECTURES
13.2. INTRODUCTION TO SERVICE-ORIENTED ARCHITECTURES
ANSI/AIM Code 39 Scanner In VS .NET
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in .NET framework applications.
A system based on a Service Orientated Architecture (SOA) is one in which resources are made available to other participants in the network as independent services that are accessed in a standardised way. This provides for more exible loose coupling of resources than in traditional system architectures (Loosely Coupled, 2005). It permits a move away from point to point integration which is costly and in exible if carried out on a large scale. Using an SOA, applications are built around services. A service is an implementation of a well-de ned business function, which allows such services to be used by clients in different applications or business processes. Increasingly, organisations are adopting an SOA as a means to enable interoperability and encourage reuse, thereby reducing cost.
Make Code 3 Of 9 In VS .NET
Using Barcode creator for Visual Studio .NET Control to generate, create Code39 image in Visual Studio .NET applications.
INTRODUCTION TO SERVICE-ORIENTED ARCHITECTURES
Read Code 39 Full ASCII In .NET Framework
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
Registry
Encode Barcode In .NET Framework
Using Barcode generator for Visual Studio .NET Control to generate, create barcode image in Visual Studio .NET applications.
Find
Bar Code Recognizer In .NET Framework
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET framework applications.
Contract
Code39 Generator In C#.NET
Using Barcode generator for Visual Studio .NET Control to generate, create USS Code 39 image in .NET applications.
Register
Painting Code-39 In VS .NET
Using Barcode creation for ASP.NET Control to generate, create Code 39 Full ASCII image in ASP.NET applications.
Consumer
USS Code 39 Maker In VB.NET
Using Barcode creation for .NET framework Control to generate, create Code 39 Full ASCII image in .NET applications.
Bind & Invoke
Code128 Encoder In .NET Framework
Using Barcode printer for VS .NET Control to generate, create Code-128 image in .NET applications.
Provider
Barcode Creation In .NET Framework
Using Barcode drawer for VS .NET Control to generate, create barcode image in VS .NET applications.
The SOA nd-bind-execute model.
ECC200 Creator In .NET
Using Barcode drawer for .NET framework Control to generate, create Data Matrix image in .NET applications.
Services are software components with a well-de ned interface that is implementation-independent. A key aspect of an SOA is the separation of the service interface from its implementation (Mahmoud, 2005). The bene ts from adopting an SOA approach include:     Services are self-contained. Services are loosely coupled. Services can be dynamically discovered. Composite services can be built from aggregates of other services.
Interleaved 2 Of 5 Printer In Visual Studio .NET
Using Barcode encoder for .NET Control to generate, create USS ITF 2/5 image in .NET applications.
SOA uses the nd-bind-execute model as shown in Figure 13.1. Service providers rst register their service in a registry. This registry is then used by consumers to nd services that match certain criteria. If the registry has such a service, it provides the consumer with a contract and information on accessing the service. The greater agility afforded by an SOA will also allow organisations to respond to the needs of the market more quickly and in ways that are more attractive to the customer. The SOA is particularly applicable to the Telecommunications market where customer and operational support costs are high and customer satisfaction is a key differentiator. However, there is evidence to suggest that companies with complex internal organisations and supply chains will nd that large scale SOAs are not achievable without semantic descriptions of service components that can aid service discovery and integration. For example, Brodie (2003), Chief Scientist at Verizon Communications stated that: There is a growing consensus that Web Services alone will not be suf cient to develop valuable and sophisticated Web processes due the degree of heterogeneity, autonomy, and distribution of the Web. Before the huge promise of Web Services become industry strength, a lot of work is needed, and semantics holds a key .
Decoding UPC-A Supplement 2 In .NET Framework
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
A SEMANTIC SERVICE-ORIENTED ARCHITECTURE
Data Matrix Generation In Visual C#.NET
Using Barcode creation for Visual Studio .NET Control to generate, create ECC200 image in Visual Studio .NET applications.
It is apparent that Web Services alone are not enough to implement an SOA and enable the advantages that this architecture can bring (such as dynamic discovery and execution of services). Using Semantic Web Services allows the creation of machine readable descriptions of the service capability and interface, allowing the dynamic discovery and execution of services.
Draw GS1 - 13 In Visual Basic .NET
Using Barcode encoder for Visual Studio .NET Control to generate, create EAN-13 Supplement 5 image in .NET applications.
13.3. A SEMANTIC SERVICE-ORIENTATED ARCHITECTURE
Barcode Creation In Visual C#.NET
Using Barcode printer for VS .NET Control to generate, create bar code image in .NET framework applications.
This section will explain the bene ts of semantically described web services in the context of an SOA. In order to do this, the limitations of current web services are rst considered. Web Services are generally described using XML-based standards namely WSDL (which allows one to describe a Web Service in terms of what it does and what its inputs and outputs are), UDDI (which is a centralised registry allowing one to discover Web Services) and SOAP (which is a protocol allowing one to execute services). In addition to these low-level standards, work is in progress to create standards that allow services to be combined into a work ow, for example WS-BPEL (Web Services Business Process Execution Language) (IBM, 2005) and also to de ne permissible message exchange patterns and contents, for example ebXML (Eisenberg, 2001). However, none of these standards provide a means to describe a Web Service in terms of explicit semantics. For a given service you might want to describe:       What kind of service it is; What inputs it requires; What outputs it provides; What needs to be true for the service to execute (pre-conditions); What becomes true once the service has executed (post-conditions); What effect the service has on the state of the world (and/or the data it consumes and provides).
Paint ANSI/AIM Code 39 In .NET Framework
Using Barcode generation for ASP.NET Control to generate, create Code39 image in ASP.NET applications.
The rst of these requirements is partly addressed by UDDI in that a category and human readable description can be assigned to a web service in a registry to aid discovery. This provides only limited support for automated discovery since a computer will not understand1 the description or what the category means. The second and third of these requirements are partly addressed by WSDL in that XML tags can be attributed to inputs and outputs. A computer can easily match these but
Recognize ECC200 In VS .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET applications.
Strictly, the computer never actually understands even when semantics are provided. It is merely provided with the means to relate a piece of information to a machine readable ontology which in turn allows it to determine relationships with other pieces of information and given these perform reasoning to deduce new information. Thus the provision of semantic descriptions makes data much more amenable to machine processing.
Bar Code Decoder In .NET Framework
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
Bar Code Drawer In Java
Using Barcode generator for Java Control to generate, create bar code image in Java applications.