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Remote Procedure Calls and Web Services Zachary G. Ives University of Pennsylvania CIS 455 / 555 – Internet and Web Systems March 3, 2009

Today ,[object Object],[object Object]

Some Common Modes of Building Distributed Applications ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Fully Synchronous Request/Response: Remote Procedure Calls ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A Remote Procedure Call Visualized time working server is busy request function server waits for req. client blocks RPC Server RPC Client

How RPC Generally Works ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Passing Value Parameters ,[object Object],2-8

RPC Components ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Parameter Passing Can Be Tricky Because of References ,[object Object],2-18

What Are the Hard Problems with RPC? Esp. Inter-Language RPC? ,[object Object],[object Object],[object Object],[object Object],[object Object]

Web Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Three Parts to Web Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Protocol Stacks of Web Services Enhanced + expanded from a figure from IBM’s “Web Services Insider”, http://www-106.ibm.com/developerworks/webservices/library/ws-ref2/ Other extensions SOAP Attachments WS-Security WS-AtomicTransaction, WS-Coordination SOAP, XML-RPC XML XML Schema Service Description (WSDL) Service Capabilities (WS-Capability) Message Sequencing Orchestration (WS-BPEL) Inspection Directory (UDDI) Wire Format Stack Discovery Stack Description Stack WS-Addressing High-level state transition + msging diagrams between modules

Messaging Protocol: SOAP ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A SOAP Envelope ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Making a SOAP Call ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SOAP Return Values ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How Do We Declare Functions? ,[object Object],[object Object],[object Object],[object Object],[object Object]

A WSDL Service Service Port Port Port PortType Operation Operation PortType Operation Operation PortType Operation Operation Binding Binding Binding

Web Service Terminology ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example WSDL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

JAX-RPC: Java and Web Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Different Options for Calling ,[object Object],[object Object],[object Object]

Creating a Java Web Service ,[object Object],[object Object]

Example Configuration File ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Starting a WAR ,[object Object],[object Object],[object Object],[object Object],[object Object]

Finding a Web Service ,[object Object],[object Object],[object Object],[object Object]

What’s in UDDI ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Data Types in UDDI ,[object Object],[object Object],[object Object],[object Object],[object Object]

Relationships between UDDI Structures publisherAssertion businessEntity businessService bindingTemplate tModel n 2 1 n 1 n m n

Example UDDI businessEntity ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

UDDI in Perspective ,[object Object],[object Object],[object Object]

The Problem: With UDDI and Plenty of Other Situations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

This Brings Us Back to XQuery, Whose Main Role Is to Relate XML ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Lazy Evaluation: A Virtual View Source2.xml Source1.xml Virtual XML doc. XQuery Query Form Browser/App Server(s) Query Results XQuery Source2.xml Source1.xml Composed XQuery HTML XSLT

Let’s Look at Some Simple Mappings ,[object Object],[object Object]

Challenges of Mapping Schemas ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example Schemas ,[object Object],[object Object],[object Object],[object Object],Want to map data from one schema to the other

Mapping Bob’s Movies  Mary’s Art ,[object Object],[object Object],[object Object]

The Final Schema Mapping ,[object Object],[object Object],Note the absence of subject … We had no reasonable source, so we are leaving it out.

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