By Yuli Vasiliev

While applied inside a Service-oriented structure (SOA), internet providers are a part of a company method deciding on the logical order of carrier actions logical devices of labor played through a number of companies. this present day, the preferred instrument for organizing provider actions into enterprise tactics is internet companies enterprise method Execution Language (WS-BPEL), a language defining an execution structure for company techniques working on net providers. whereas it's not a trivial job to outline a company strategy definition with WS-BPEL from scratch, utilizing a graphical WS-BPEL instrument can considerably simplify this method.

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Extra resources for SOA and WS-BPEL: Composing Service-Oriented Solutions with PHP and ActiveBPEL

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In particular you will learn how to: • Expose application logic as a Web service • Build Web service providers and requestors • Encapsulate the underlying logic of a Web service in a PHP class • Use the XML Schemas specification with WSDL • Transmit XML documents containing attributes • Extend predefined classes of the PHP SOAP Extension • Build Web services supporting parameter-driven operations Building Service Providers and Service Requestors Depending on the interaction scenario in which a Web service is involved, it can either act as a service provider or a service requestor.

If everything goes as planned, you will see a PO inserted! message in your browser. Otherwise, a SOAP fault message appears. For example, if the placeOrder method of the purchaseOrder class��������������������������������������������������������� fails to connect to the database, you will see an error message that will look as follows: Failed to connect to database Turning back to the placeOrder method of the purchaseOrder class discussed in the Developing the PHP Handler Class section earlier, you may notice that it also throws a SOAP exception upon failure to insert the received PO into the database.

Building reusable services supports the principle of composability. • Composability represents the ability of services to be grouped into composite services that coordinate an exchange of data between services being aggregated. For example, using an orchestration language, such as WS‑BPEL, allows you to compose fine-grained services into more coarse‑grained ones. WS-BPEL is discussed in the WS-BPEL section later in this chapter. • Statelessness means that services don't maintain their state specific to an activity.

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