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Exposing EJBs as web services
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Figure 15.1 ActionBazaar built a web service and registered it in the UDDI registry. A client application searches the registry to find the service. The registry returns the WSDL registered by the service, and uses the WSDL to invoke the web service.
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runtime, depending on known data, user preferences, user locale, or any number of other circumstances unique to the client application at that moment in time. The ActionBazaar developers build a few loosely coupled services such as CreditVerificationService and CreditCardChargeService. These are exposed as web services and are seamlessly found and consumed by the KabadiBazaar application, even though it was built using a completely different technology. Of course, 100 percent compatibility between different platforms is still eluding the masses. Most developers are more than willing to accept 95 to 98 percent compatibility out of the box and make the final adjustments themselves. The alternative is to do a lot more work, for a lot less reward.
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Web Services-Interoperability (WS-I)
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WS-I (www.ws-i.org) is an open industry consortium, with members from diverse industries. It consists of large vendors such as Microsoft, Oracle, IBM, BEA, and Sun Microsystems. WS-I s primary goal is to promote interoperability of web services across middleware platforms, operating systems, and programming languages. WS-I provides a specification known as Basic Profile that lists a set of recommendations to achieve maximum interoperability of web services between heterogeneous platforms. Java EE 5 requires support for the Basic Profile 1.1 specification in order for any implementation to claim compatibility.
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What is a web service
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We recommend you check out Eric Pulier and Hugh Taylor s Understanding Enterprise SOA (Manning, 2005) for more in-depth coverage of this topic. Also, here are some web sites to visit:
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http://www.w3c.org/2002/ws (W3C Consortium on web services) http://www.ws-i.org (The WS-I [Web Services-Interoperability] Organization) http://msdn.microsoft.com/webservices/ (Microsoft Developer Network) http://www-128.ibm.com/developerworks/webservices (IBM s SOA and Web Services page) http://ws.apache.org/ (Apache)
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In this section we ll first look at core components of a web service. Then we ll discuss the various styles of web services and their differences. Finally, we ll examine some approaches to web service development.
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15.1.1 Identifying web service components
The web service landscape is comprised of an alphabet soup of standards, protocols, and technologies. At its core, a web service is published by a service producer and accessed by a service consumer. This almost always ends up with an XML document being sent over an HTTP transport. As a general rule the data protocol shared between service consumer and producer is based on some flavor of XML,
REST web services
Representational State Transfer (popularly known as REST) is a popular architectural style of building web services. It doesn t depend on a SOAP envelope, but it does leverage XML and the HTTP protocol. Statistics revealed by large web-based companies like Amazon and Yahoo! shows that a majority of their consumers use a REST interface. Unfortunately, Java EE 5 doesn t require support for REST web services and each vendor supports its own approach. GlassFish supports RESTful web services by creating an implementation of the javax.ws.Provider interface. Vendors such as Oracle allow you to convert a Java object into a web service by using proprietary configuration or a proprietary annotation. Check your vendor s documentation to see if they provide REST support, and see how that support is implemented. For more information on REST, hop over to http://en.wikipedia.org/wiki/Representational_ State_Transfer.
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but the transport can be any network protocol. Implementations exist for several standard transport protocols besides HTTP, including JMS, SMTP, and FTP. Several approaches are available for implementing a web service. The three most widely used are REST (Representational State Transfer), XML -RPC (Extensible Markup Language Remote Procedure Call), and SOAP. Although there are valid reasons to use REST and XML -RPC, the majority of enterprise applications use some form of a SOAP stack for their web services. This is primarily due to the fact that most standards for sharing industry-specific data (such as travel, health care, financial) via web services are based on the SOAP architectures. This chapter will focus on the SOAP stack because it is the most prominent of the three architectures. That s enough talk about the general SOA landscape. We ll start with some basics of the SOAP architecture. Let s begin by defining what a typical SOAP stack includes:
Service messaging Messages are sent between the client and service in XML, the universal format for metadata. For a SOAP stack, this means that the messages follow the SOAP standard for message structure and definition (www.w3.org/TR/soap/). Service description Each web service has a corresponding XML document that describes the web service, the parameters that it expects to be passed, which ones are optional and which are required, what their data types are, what will be returned, and so forth. A web service client consumes the WSDL file in order to communicate with a web service (www.w3.org/TR/wsdl). Service discovery Think of this as the Yellow Pages for web services. When a web service wants to make itself known, it registers itself to a UDDI registry by providing the WSDL required to access the service. Clients can browse registries looking for services that meet their requirements (www.uddi.org/ specification.html). Service transport This is the network mechanism responsible for transporting messages between the client and the service. The Hypertext Transfer Protocol (HTTP) is most commonly used, but any transport should work.
Stick with us as we take a closer look at these web service building blocks. Defining a message: SOAP The Simple Object Access Protocol (SOAP) is a distributed protocol similar to CORBA and Java RMI. It lets applications talk to each other by exchanging
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