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Web services are typically created for the purpose of exchanging data between applications or services, or for exposing an object method for access by another software program[5] A Web service contract defines how the Web services messages are mapped between various applications, technologies, and software systems [5] It must be noted that using Web services for remote object invocation is an inappropriate use of Web services If you want to implement distributed objects, then you should use a distributed object technology, like Java RMI or CORBA Web services is a documentoriented technology, not an object-oriented technology Nevertheless, it is a fact of life that some analysts and vendors recommend that the best way for, say, a C# requestor to communicate with, say, a Java provider is using RPC-oriented Web services In an ideal world, a Java bean could seamlessly invoke any NET Framework object developed using Visual Basic, C#, or Visual C++, but because of platform and language differences, this is not possible In a nutshell, the NET platform is designed for close compatibility with the Windows operating system, and it takes full advantage of native Windows features such as multithreading, memory management, file system access, and other system-level APIs On the other hand, the J2EE platform takes advantage of the Java virtual machine's portability layer to provide the same features and functionality across all operating systems on which it runs Web services can be used to provide interoperability across applications developed using NET and J2EE, but there are limitations because of the level of functionality currently available in Web services and because of significant differences between the NET architecture and the J2EE architecture Figure 4-4 places the NET and J2EE environments side by side, highlighting the fundamental difference in their designs with respect to operating system integration NET is designed to integrate very closely with the Windows operating system, while J2EE is designed to work on any operating system, including Windows
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Figure 4-4 Comparing J2EE and NET architectures [View full size image]
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Because of key differences, interoperability between the NET platform and the J2EE platform is limited and can only be achieved at a fairly high level of abstraction The best approach is to define service contracts (ie, WSDL interfaces) that either exchange coarse-grained data objects or encapsulate multiple method invocations into a single WSDL service For example, if both applications need to share customer data, then you should define an XML Schema for the customer record, use it to define the appropriate WSDL operations, and generate SOAP messages based upon it The WSDL file and the associated XML Schema are crucial because they define the shared data model
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Applying SOA and Web Services for IntegrationService-Enabling Legacy Systems
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Web services technologies can be used to create a contract between disparate software systems such as J2EE, CORBA, NET, WebSphere MQ, and packaged applications This contract is described using XML and is expressed using a pattern of messages exchanged between the described applications The contract defines a mutually agreed abstraction of the systems being bridged Because J2EE, NET, CORBA, WebSphere MQ, SAP, and virtually any other software system all understand Web services, getting them to interoperate means finding Web services contracts upon which the disparate systems can agree One of the advantages of well-defined service contracts is that they can be extended beyond newly developed Web services to also incorporate legacy systems In particular, legacy systems can be service-enabled by defining WSDL contracts for them and providing SOAP applications that can receive SOAP messages and convert them into message-level or API-level invocations of the legacy systems The benefit of this approach is that it allows organizations to cost-effectively reuse valuable legacy assets without adopting expensive and risky "rip-and-replace" strategies Almost any legacy system can be service-enabled, including the following: Mainframe systems (eg, CICS and IMS) Distributed object applications (eg, CORBA, DCOM, J2EE) Transaction processing systems (eg, Tuxedo and Encina) Packaged applications (eg, SAP, PeopleSoft, Oracle applications) DBMS (eg, Oracle, Sybase, DB2, SQL Server) B2B and messaging systems (eg, SWIFT, EDIFACT, X12, HL7, WebSphere MQ, JMS, MSMQ) In the following sections, we give some practical examples of service-enabling legacy systems
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