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【正文】 imes ? Solutions available today ? Application logic (message recognition) Microsoft Architects Forum 59 Motivations (2/2) ? In order message delivery ? Current problems ? HTTP messages arrive unordered ? Solutions available today ? Application logic (message sequencing) Microsoft Architects Forum 60 WSReliableMessaging ? QoS over unidirectional message sequences ? Exactly once, inorder ? Simplifies application programming ? Handles lost, duplicated or delayed messages ? Handles endpoint failures ? Acknowledgements sent upon receipt ? Not after application processing Microsoft Architects Forum 61 Reliable Messaging WSReliableMessaging Microsoft Architects Forum 62 WSAtomic Transaction WSCoordination WSBusiness Activity Transactions Microsoft Architects Forum 63 WSAtomic Transaction WSCoordination WSBusiness Activity WSCoordination Microsoft Architects Forum 64 WSCoordination ? Activity spans multiple services ? Creating and registering activities (. ATs) ? Generating coordination context ? Passing data to register for transactions ? Extensible coordination types ? AT and BA are predefined Microsoft Architects Forum 65 WSAtomic Transaction WSCoordination WSBusiness Activity WSAtomicTransaction Microsoft Architects Forum 66 Motivation ? Transaction spans multiple Services ? Multiparty, all or nothing state change, synch ? Two Phase Commit ? Phase 1: Prepare to Commit ? Phase 2: Commit or Abort Microsoft Architects Forum 67 WSAtomicTransaction ? Classic 2 Phase Commit ACI(D) protocol ? Prepare ? Commit/Rollback ? Durable or volatile ? All resources must be up (synchronous) ? Allornothing (plete agreement) ? Resources are locked ? Requires shared assumptions about latency/trust Microsoft Architects Forum 68 WSAtomic Transaction WSCoordination WSBusiness Activity WSBusinessActivity Microsoft Architects Forum 69 Motivation ? Loosely coupled long running transaction ? Multiparty, final consistent state, asynch Microsoft Architects Forum 70 WSBusinessActivity ? Looser isolation model ? Intermediate states visible (no locks) ? Operations cannot be undone (no abort) ? No requirement to lock resources ? Appropriate for crossing trust domains Microsoft Architects Forum 71 WSAtomic Transaction WSCoordination WSBusiness Activity Transactions Microsoft Architects Forum 72 Web Services Platform Connected Applications Transports Management Business Process Devices Mobile P2P EAI B2B Grid XML … Messaging Secure Reliable Transacted Metadata Microsoft Architects Forum 73 The Microsoft WSPlatform ? *.asmx running under ? Web Service Enhancements (WSE ) ? WSSecurity, WSSecureConversation, WSTrust ? WSAttachments ? WSAddressing ? WSReferral ? WSPolicy, WSSecurityPolicy ? Future: “Indigo” Microsoft Architects Forum 74 Summary ? There is no need for WSLinkedList ? You don’t have to understand the details ? Only the plumbers have to ? No vendor will implement all specs ? Sometimes it’s quite political WSI_M_REALLY_CONFUSED Microsoft Architects Forum 75 16
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