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SOA-14: Web Services Standards Update

SOA-14: Web Services Standards Update. Dave Chappell Vice President & Chief Technology Evangelist, Sonic Software. Our Goals Today. Understand what’s so hip about standards ...and also their limitations Summarize what’s up in the Web Services standards space

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SOA-14: Web Services Standards Update

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  1. SOA-14: Web Services Standards Update Dave Chappell Vice President & Chief Technology Evangelist, Sonic Software

  2. Our Goals Today • Understand what’s so hip about standards • ...and also their limitations • Summarize what’s up in the Web Services standards space • ...and why WS standards are interesting • Adopt a hopeful but realistic picture of WS interoperability and evolution SOA-14:Web Services Standards Update

  3. Some Familiar Standards • Power • Phone lines • Railroads • Currency • etc... SOA-14:Web Services Standards Update

  4. Standards – Why the Big Deal? • Standards allow for independently developed (over time and space) components to interoperate • Open standards discourage monopolization • Anyone can implement (and even affect) the standard • Standards bodies (gov’ts, IETF, W3C, etc) = shared control • Standards reduce costs of development + maintenance • Shared skills, commoditized tools SOA-14:Web Services Standards Update

  5. Benefits of Using Software Standards • Categories • API standards (Java™, .NET™, open-source) • Protocols (TCP, HTTP, SOAP) • Data Formats (XML, ASN.1, WSDL, UBL) • Benefits • Leveraging common developer skills • Interoperability with more partners • Insulation from implementation changes • Pluggability (vendor independence + evolution) • Validation / tool support SOA-14:Web Services Standards Update

  6. What’s So Special About Web Services • Web Services == Application Interoperability • Haven’t we been here before? DCE, CORBA.... • Everyone actually seems to support the bottom layers! • SOAP / WSDL interop is real today • Soapbuilders, WS-I + de jure standardization • Don’t need the whole stack in order to go ahead • An orthogonally developed set of composable specs • Extensibility built in at each layer (protocol, metadata) • This hasn’t really been tried before! • There are tradeoffs.... SOA-14:Web Services Standards Update

  7. Composability • Composition is the “Elephant in the Room” for WS • Encryption + Compression = ??? • For composability to work, we need a common language • Forays into this area: • SOAP Extensibility Model • WSDL Features and Properties • WS-Policy SOA-14:Web Services Standards Update

  8. A Whirlwind Tour of the WS Stack • Goal is to understand what each spec means and where it’s at in its development • Not deep technical details! SOA-14:Web Services Standards Update

  9. The “Four Pillars of Web Services” • SOAP • WSDL • Policy • Addressing SOA-14:Web Services Standards Update

  10. XML – The “Zeroth” Pillar • Common data representation (Infoset + Serialization) • Fairly simple (simpler than SGML) • Human readable • Lots of tool support • XML Schema • Validation and typing • Related : XPath, XSLT, XQuery, XLink, XInclude • XML 1.0 and Schema 1.0 are W3C Recommendations SOA-14:Web Services Standards Update

  11. SOAP • Messaging Envelope • Extensibility framework • Vertical – headers • Horizontal – intermediaries <Envelope> <Header> <Encrypted MustUnderstand=“true”/> Notary Partner <Body> Encrypted Purchase Order Purchase Order SOAP Message SOA-14:Web Services Standards Update

  12. SOAP, cont. • Faults, Versioning, RPC, Encoding • SOAP 1.1 is a W3C Note • SOAP 1.2 is a W3C Recommendation • Binding Framework • Features & Properties • Modules • Processing model clarifications • Infoset-based • Cleaner fault model • NotUnderstood header SOA-14:Web Services Standards Update

  13. WSDL • Web Service Description Language • “IDL” for Web Services • WSDL 1.1 is a W3C Note • WSDL 2.0 is in Last Call at W3C • Simpler (no <part>s) • Interface inheritance/extension • Single Interface per Service • SOAP 1.2 / MTOM support • Flexible MEPs SOA-14:Web Services Standards Update

  14. policy : More Metadata, Please! • policy allows expressions of assertions • You MUST... • I SUPPORT... • Rules for composition, comparison • WSDL Features & Properties / SOAP Modules • WS-Policy (MS/IBM/BEA/SAP/Sonic/Verisign) • XAML • WS-Policy will eventually be submitted to a standards body (likely W3C) • No timeline yet SOA-14:Web Services Standards Update

  15. WS-Addressing • WSA is the machinery behind asynchronous SOAP • Building blocks for complex MEPs (callback, routing) • Defines Endpoint References, Addressing Headers • <To>, <From>, <MessageID>, <ReplyTo>, <FaultTo> • Abstract spec, binding to SOAP • WS-Addressing is in the W3C, accelerated schedule • Last Call in… March? SOA-14:Web Services Standards Update

  16. The “Four Pillars” • SOAP • WSDL • Policy • Addressing • When these foundational pieces are standard, the WS extensibility/agreement mechanisms kick in and allow us to either interoperate or fail gracefully. • On the wire, and at design/metadata time SOA-14:Web Services Standards Update

  17. MTOM + XOP • Unified, infoset-based approach to binary attachments • Helps with programming model • Eases security/encryption • Abstract Transmission Optimization Feature • XML-binary Optimized Packaging • Not tied to SOAP • HTTP Transmission Optimization Feature • Lots of support • MTOM + XOP are W3C Recommendations (Jan 2005) SOA-14:Web Services Standards Update

  18. WS-Security • Rules for putting security principals, certificates, and encryption info into SOAP messages • End-to-end security • Token Profiles • Username/password, X.509, SAML, REL • WS-Security is an OASIS Standard • but WS-SecurityPolicy is not... • so there’s no standard way to do this in WSDL yet! SOA-14:Web Services Standards Update

  19. WS-Reliab* • Reliable messaging comes in two flavors, WS-Reliability (OASIS) and WS-ReliableMessaging (MS/IBM) • WS-Reliability is an OASIS Standard • WS-ReliableMessaging has been submitted to OASIS as WS-RX TC • Will MS/IBM implement WSReliability? Doubtful. • OK to have two? (Sonic a member of both) SOA-14:Web Services Standards Update

  20. WS-Eventing / WS-Notification • Patterns for asynchronous pub/sub WS interactions • “Subscribe this EPR to receive future events” • Notification includes hierarchical Topic Spaces • Both make heavy use of WS-Addressing • Eventing is an MS/TIBCO/BEA spec • Notification is in OASIS Technical Committee • Merging base specs seems obvious • … but WSN’s dependence on WSRF makes that a bit challenging SOA-14:Web Services Standards Update

  21. Working up the stack – Process Models Choreography BPEL • Process modeling – linked series of WSDL operations and logic • Faults / compensation • BPEL : Based around a single node’s viewpoint • Choreography : “Omniscient Observer” viewpoint. SOA-14:Web Services Standards Update

  22. Other Specs • UDDI (OASIS) • WS-Context / CAF (OASIS) • WS-Coordination / Transactions (MS/IBM) • WS-ResourceFramework (OASIS) • WS-Distributed Management (OASIS) • etc... (too many to discuss here) SOA-14:Web Services Standards Update

  23. So How are we Doing? • Basic interop is there now • Yee ha!! • Important specs coming together…but • Composability story isn’t there yet • We need to be writing extensions with hooks / abstraction • Where’s Policy? • What about competing specs? • We should be OK with two or more of some layers SOA-14:Web Services Standards Update

  24. Closing Thoughts • Adopt SOAP/WSDL now • Really means “adopt SOA now” : modular, message-based interfaces • Useful no matter what else happens • More stuff will settle while you start • GET INVOLVED if you hope to use this stuff • Push on your vendors to ensure they’re on top of it • Join groups yourself • Platforms (.NET, Java, Axis, etc) support composibility + extensions • pick a good model, and ask questions • Standards aren’t a panacea • but they make some great platforms interoperable SOA-14:Web Services Standards Update

  25. ? Q & A SOA-14:Web Services Standards Update

  26. Thank you for your time! SOA-14:Web Services Standards Update

  27. SOA-14:Web Services Standards Update

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