Transactional Programming In A Windows World.ppt

Transactional Programming In A Windows World James Johnson and Don Box Architects, Indigo Microsoft Corporation {jimjohn,dbox}@ Why Transactions? Order vs. Chaos Why Not Transactions? Excuses and Issues Transactions And Windows Productivity, Scalability, Ubiquity Transactions And Windows System.Transactions Transactions come to the CLR System.Transactions System.TransactionsExplicit/Manual Model System.Transactions Kicking the tires… System.TransactionsImplicit Model System.TransactionsDeclarative Model System.Transactions Implicit scopes in Whidbey LTM, KTM And DTC The Three Amigos of Transaction Management LTM,KTM,DTC Transaction Agility Agile Transactions Stupid transaction tricks… Transactional Resources Beyond the DBMS Transactional Resources System.Transaction And Enlistment Volatile Enlistment Suffrage for VB… Transactions And Durability Durable resources typically rely on a log System.Transactions.Log provides a unified transaction-aware log Uses Windows Logging System (WinLS) Implements ARIES protocol for undo/compensate Savepoints allow checkpointing work Common log reduces I/O costs for all participants Transactions And Isolation Transaction resources typically use locks to enforce isolation System.Transaction.Isolation provides an app-level lock for internal use by RM Implements read/update/write semantics Implements two-phase locking protocol Allows arbitrary correlation for reentrancy Where Are We? System.Transactions makes transactions broadly accessible in Whidbey The LTM and KTM improve transaction scalability based on the needs of the application, not the infrastructure We’re making it much easier to build transactional resources For More Information Come see us Immediately after this session Web/Services Lounge: 309 Foyer MSDN “Longhorn” DevCenter /longhorn Newsgroup microsoft.public.windows.developer.winfx.fundamentals At PDC Hands on labs: On-site or download from CommNet Ask The Experts: Tuesday 7 PM – 9 PM Hall G, H PDC Weblogs: ARC303 To