DataSource (Discovery)

Article
05/16/2012

Applies To: Operations Manager 2007 R2, System Center Operations Manager 2007

Represents an implementation of a data source module type definition.

Schema Hierarchy

ManagementPack
  Monitoring
    Discoveries
      Discovery
        DataSource (Discovery)

Syntax

<DataSource ID=”ModuleID” Comment=”Comment” TypeID=”ModuleTypeID”>
Custom Schema Defined Parameters
</DataSource>

Attributes and Elements

The following sections describe attributes, child elements, and the parent element of the DataSource element.

Attributes

Attribute	Description
ID	Required attribute. Represents the identity of the element.
Comment	Optional attribute. Represents commentary by the management pack author.
TypeID	Required attribute. Represents DataSource module type definition from which this DataSource module inherits its configuration schema.

ID Attribute Values

Value Description

Value	Description
The format for the ID attribute should be `UniqueElementID`.	The ID string must contain the following characteristics: The length is less than 255 characters. The ID begins with a letter (a-z) or a number (0-9). The ID contains only letters, numbers, the period character (.), or the underscore (_) character. The ID is unique across all elements within the scope of the DataSource module’s containing workflow. The ID is case-sensitive.

The format for the ID attribute should be UniqueElementID.

The ID string must contain the following characteristics:

The length is less than 255 characters.
The ID begins with a letter (a-z) or a number (0-9).
The ID contains only letters, numbers, the period character (.), or the underscore (_) character.
The ID is unique across all elements within the scope of the DataSource module’s containing workflow.
The ID is case-sensitive.

Child Elements

The child element of the DataSource module is defined by the Configuration (DataSourceModuleType) schema of its base type as referenced in the TypeID attribute.

Parent Elements

Element	Description
Discovery	Defines a workflow that returns discovery data for class and/or relationship type instances.

Remarks

Because a data source module does not take an input stream, it must always be the first module in any workflow. The data source module initiates the workflow, functioning entirely or partially as a scheduler or functioning as an event provider. The data type of its output data is defined in its OutputType (ConditionDetectionModuleType) element.

A data source module type never alters system state. If you want a module to affect system state, you must instead use or implement a WriteAction (WriteActionModuleType) module.

A data source module’s base type must always be a descendant of a DataSourceModuleType type.

When a data source module is used in a discovery, it must always return a System.Discovery.Data type.

Example

The following sample illustrates how a Discovery element encapsulates a data source module named Microsoft.SQLServer.2008.DBDiscovery. The data source module of type Microsoft.SQLServer.2008.DBDiscovery internally uses script to return System.Discovery.Data at a timed interval. The definition of the data source module is provided below the discovery sample. For more information about the variable notation used in this sample, see $Target and $Config. For more information about a how to write discovery scripts, see How to Create Discovery Data Using a Script.

<Discovery ID="Microsoft.SQLServer.2008.DatabaseDiscoveryRule" Enabled="true" Target="Microsoft.SQLServer.2008.DBEngine">
  <Category>Discovery</Category>
  <DiscoveryTypes>
    <DiscoveryClass TypeID="Microsoft.SQLServer.2008.Database">
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="DatabaseName" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="RecoveryModel" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="DatabaseAutogrow" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="DatabaseSize" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="DatabaseSizeNumeric" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="LogAutogrow" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="Updateability" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="UserAccess" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="Collation" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="LogSize" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="LogSizeNumeric" />
      <Property TypeID="SQL!Microsoft.SQLServer.Database" PropertyID="Owner" />
    </DiscoveryClass>
  </DiscoveryTypes>
  <DataSource ID="DS" TypeID="Microsoft.SQLServer.2008.DBDiscovery">
    <IntervalSeconds>7200</IntervalSeconds>
    <SyncTime />
    <ComputerID>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/PrincipalName$</ComputerID>
    <ComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</ComputerName>
    <SQLConnectionString>$Target/Property[Type="SQL!Microsoft.SQLServer.DBEngine"]/ConnectionString$</SQLConnectionString>
    <SQLInstanceName>$Target/Property[Type="SQL!Microsoft.SQLServer.ServerRole"]/InstanceName$</SQLInstanceName>
    <ExcludeList />
    <TimeoutSeconds>300</TimeoutSeconds>
  </DataSource>
</Discovery>
…
<DataSourceModuleType ID="Microsoft.SQLServer.2008.DBDiscovery" Accessibility="Internal" RunAs="SQL!Microsoft.SQLServer.SQLDiscoveryAccount">
  <Configuration>
    <xsd:element name="IntervalSeconds" type="xsd:integer" />
    <xsd:element name="SyncTime" type="xsd:string" />
    <xsd:element name="ComputerID" type="xsd:string" />
    <xsd:element name="ComputerName" type="xsd:string" />
    <xsd:element name="SQLConnectionString" type="xsd:string" />
    <xsd:element name="SQLInstanceName" type="xsd:string" />
    <xsd:element name="ExcludeList" type="xsd:string" />
    <xsd:element name="TimeoutSeconds" type="xsd:int" />
  </Configuration>
  <OverrideableParameters>
    <OverrideableParameter ID="IntervalSeconds" ParameterType="int" Selector="$Config/IntervalSeconds$" />
    <OverrideableParameter ID="SyncTime" ParameterType="string" Selector="$Config/SyncTime$" />
    <OverrideableParameter ID="ExcludeList" ParameterType="string" Selector="$Config/ExcludeList$" />
    <OverrideableParameter ID="TimeoutSeconds" ParameterType="int" Selector="$Config/TimeoutSeconds$" />
  </OverrideableParameters>
  <ModuleImplementation>
    <Composite>
      <MemberModules>
        <DataSource ID="DS" TypeID="Windows!Microsoft.Windows.TimedScript.DiscoveryProvider">
          <IntervalSeconds>$Config/IntervalSeconds$</IntervalSeconds>
          <SyncTime>$Config/SyncTime$</SyncTime>
          <ScriptName>DiscoverSQL2008DB.vbs</ScriptName>
          <Arguments>$MPElement$ $Target/Id$ $Config/ComputerID$ $Config/ComputerName$  $Config/SQLConnectionString$ $Config/SQLInstanceName$ "Exclude:$Config/ExcludeList$"</Arguments>
          <ScriptBody>
            <![CDATA[
            ‘Discovery script to return discovery data goes here.
           ]]>
          </ScriptBody>
          <TimeoutSeconds>$Config/TimeoutSeconds$</TimeoutSeconds>
        </DataSource>
      </MemberModules>
      <Composition>
        <Node ID="DS" />
      </Composition>
    </Composite>
  </ModuleImplementation>
  <OutputType>System!System.Discovery.Data</OutputType>
</DataSourceModuleType>

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