Microsoft SQL Server 2008 R2 Specifications download pdf (Page 168)

148 CHAPTER 8 Complex Event Processing with StreamInsight

Pagers and

monitoring devices

Input Adapters

Data feeds Event stores

and databases

Web servers Devices

and sensors

Event Event EventEvent

CEP Engine

Standing Queries

Event

Output Adapters

CEP Application

at Run Time

Static

reference data

Event Sources

Event stores

and databases

KPI dashboards

and SharePoint UI

Event Targets

FIGURE 8-1 StreamInsight architecture

Input Adapters

The input adapters translate the incoming events into the event format that the CEP engine

requires. You can create a typed adapter if the source produces a single event type only, but

you must create an untyped adapter when the payload format differs across events or is un-

known in advance. In the case of the typed adapter, the payload format is dened in advance

with a static number of elds and data types when you implement the adapter. By contrast,

an untyped adapter receives the payload format only when the adapter binds to the query (as

part of a conguration specication). In the latter case, the number of elds and data types

can vary with each query instantiation.

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Microsoft SQL Server 2008 R2 Specifications Page 168