Building Application With Exchange 2000 Store Events Part 1: The Basics

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Building Application With Exchange 2000 Store
Events Part 1 The Basics Nat BallouProgram
ManagerExchange Product UnitMicrosoft
Corporation
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Agenda

• Background
• Exchange 5.5 Scripting
• Exchange 2000 Event Sources
• OLE DB/ADO 2.5
• Store Events
• Scenarios
• Architecture
• Synchronous versus Asynchronous
• Event Registration

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Background
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Exchange 5.5 Scripting

• Server scripts (Agents) triggered by events
  in Exchange folders
• New, change, delete, timer asynchronous
  (notification) events
• Public or private folders containing any item
  type
• Targeted for corporate developers, Solution
  Providers
• Extend functionality of Exchange folders without
  writing C code
• Part of Exchange Server 5.5 and later

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Exchange 5.5 Scripting

• Not the answer for everything
• E.g., No House Rules
• Events are asynchronous
• No guarantee that other applications cant modify
  or delete a message before you
• E.g., can not process outgoing mail
• Does not scale as high as rest of Exchange
• Not well-suited for high-volume applications
• E.g., scan all incoming mail
• Low- to medium-volume groupware applications

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Making Exchange 2000 Programmable

• Exchange 2000 is extensible through events
• Server functionality is built using an event
  architecture
• Various plug-in components are built using store
  events (content-indexing, wireless, unified
  messaging, CDO, schema population, workflow,
  etc.)
• Architecture supports C, VB, and script event
  sinks

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Event Sources

• Transport Events
• Supports C and VB event sinks
• In-process
• Protocol Events
• Supports C and VB event sinks
• CDO extensions for VB event sinks
• In-process
• Store Events
• Supports C,VB, and script event sinks
• Synchronous and asynchronous
• Out-of-process

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OLE DB And ADO 2.5

• Store event sinks use OLE DB or ADO to access
  Exchange 2000 store
• Important OLE DB/ADO 2.5 Features
• Stream support
• URL binding
• Heterogeneous rows

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Demonstration

• OnSyncDelete

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Store Events
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Store Event Scenarios

• Data Validation/Integrity
• Use OnSyncDelete to update other data structures
  or sources
• Workflow
• Use OnSyncSave to trap changes to a document
• Use OnTimer to poll or monitor status of a
  document
• Web Forms
• Use OnSyncSave to validate form data
• Use OnTimer to purge orphaned forms

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Store Events

• An event fires when an item or folder is saved,
  moved or deleted within the store
• Events are scoped to a particular folder
• Events can be synchronous or asynchronous
• Event sinks can be written in C, VB, or script

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Store Event Architecture

• Event sinks run in their own process
• Event sinks must run on the same machine as the
  store

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Synchronous Events

• Occur before the item is committed to the store
• Occur within the context of a transaction
• Are fired in the order specified in the event
  registration
• Synchronous events are fired twice
• Once to indicate that the event occurred
• Once to indicate that the item was committed or
  aborted
• Synchronous sinks are passed OLE DB/ADO interfaces

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Asynchronous Events

• Occur after the item has been committed to the
  store
• Are not fired in any particular order
• Are guaranteed to be delivered
• Asynchronous sinks are passed URLs

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Demonstration

• OnSave

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Event Registration

• Registration of an event on a folder is
  controlled by an item with a specific
  content-class saved in the folder
• Events are scoped to fire in a particular folder
  and/or child folders
• Synchronous events have an assigned priority
• Each registration may contain criteria in the
  form of a SQL where clause
• OnTimer registrations have a start time, an
  interval, and expiry time

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Available Store Events

• Synchronous
• OnSyncSave
• OnSyncDelete
• Asynchronous
• OnSave
• OnDelete

• System
• OnTimer
• OnMDBStartUp
• OnMDBShutdown

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Advanced Topics

• Registration parameters
• Event firing order
• Event security
• COM applications
• Transactions
• Visual Basic examples
• Etc.

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Store Events

• Questions?

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Developer Key Messages

• http//msdn.microsoft.com/exchange is your
  complete source for Exchange developer
  information
• Build Web applications using the Web Store 
• Access data in the Exchange store with ADO 2.5 or
  OLE DB 2.5
• Use CDO to add collaboration and workflow
  functions
• Add server-side logic with Store Events

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