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A brief history of Web Services
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Early e-services, however, have exposed their interfaces in an ad-hoc manner, meaning that no standardized interoperability existed between services. The XML-RPC specification was released in 1999 [Win99] as a simple remote procedure call definition. To further facilitate automated access to complex services, a group of companies, including IBM and Microsoft, and more recently the W3C, have released a number of Web Services standards. These include SOAP [BEK+00], WSDL [CCM+01], and UDDI [Oas02]. SOAP is the successor to XML-RPC. Today s Web Services are distributed services with WSDL interfaces. They are more often message-oriented than RPC-oriented. WSDL allows for a variety of transports, protocols, and message formats. SOAP over HTTP is just one possible Web Services protocol. A number of successful middleware frameworks, such as CORBA, DCOM, .NET Remoting, or RMI, have been around for a while and can also be used to build complex services. The question therefore arises: aren t Web Services just reinventing the wheel In the middleware integration world, however, interoperability problems occurred that are similar to the early inter-operation problems of e-services. As Steve Vinoski puts it [Vin03]: Unfortunately, middleware s success and proliferation has recreated at a higher level the very problem it was designed to address. Rather than having to deal with multiple different operating systems, today s distributed-application developers face multiple middleware approaches. Among other things, a goal of Web Services is to provide a middleware for middleware. In this section we explain some central differences of the Web Services approach compared to other middleware approaches. Internally, Web Services are implemented using the same remoting patterns as other distributed object middleware systems which is what we try to convey in the remainder of this technology projection. Web Services are designed around the stateless exchange of messages. This design is originally due to the stateless nature of the HTTP protocol. In HTTP, stateful interactions are implemented as extensions on top of HTTP, such as cookies or sessions. Web Services use a similar stateless request/reply scheme for a message-oriented interaction, leading to a loose coupling of clients and servers.
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Web Services Technology Projection SOAP is an XML-based message exchange format that is used in almost all Web Services frameworks available to date. It can be extended in various ways, including secure, reliable, multi-part, multi-party, and/ or multi-network transport of messages. This also allows the messaging infrastructure to provide authentication, encryption, access control, transaction processing, routing, delivery confirmation, and so on. SOAP has quickly become a de-facto standard in the Web Services domain. It is often equated to Web Services in general, although this is not quite correct, as there are other Web Services protocols around, and most applications of Web Services use more technical infrastructure than just a message-exchange protocol. As shown below, there is a stack of different components (which often differ in different implementations) that together provide a Web Services infrastructure. WSDL is used for XML-based service descriptions commonly understood by Web Services producers and consumers among other information, it contains INTERFACE DESCRIPTIONS. It facilitates interoperability across heterogeneous systems by providing the precise structure and data types of the messages. Web Services do not require any particular communication protocol. For example, HTTP, other Internet protocols such as SMTP and FTP, generic interface APIs such as JMS, other distributed object protocols such as IIOP, or almost any other communication protocol can be used. Most Web Services implementations today, however, use HTTP as their communication protocol. Above the level of individual message exchanges, Web Services standardize process descriptions. This includes UDDI as a lookup service, a kind of service that can be found in many other distributed object middleware as well. But it also includes XML-based standards for higher-level business transactions, multi-part and stateful sequences of messages, and the aggregation of elementary processes into composite processes. For example, the Business Process Execution Language for Web Services (BPEL4WS) [ACD+03] is an XML-based workflow definition language that allows businesses to describe business processes that can both consume and provide Web Services. BPEL emerged from IBM s WSFL and Microsoft s XLANG. The WS-Coordination [CCC+03] and WS-Transaction [CCC+02] specifications complement BPEL4WS, in that they provide a Web Services-based approach to improving the dependability of automated, long-running business transactions in an
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