Class Reference
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abstract class %iKnow.Source.Lister extends %RegisteredObject

Deprecation note: Direct use of this class is still supported, but it is recommended to use either Domain Definitions (cf %iKnow.DomainDefinition) to manage a domain's contents or use the shorthand methods in %SYSTEM.iKnow to work with an existing domain not managed through a domain definition class.

This is the base class for any Lister implementations. Lister classes are used at the start of the load process to identify the sources that need to be loaded. Each Lister implemenation is specifically designed to be able to scan a certain type of source locations, for example a filesystem for %iKnow.Source.File.Lister and a SQL query for %iKnow.Source.SQL.Lister

Each Lister implementation class defines a set of Lister Parameters, specifying how to reach the sources in the particular type of location this Lister class is designed to work with. For a file lister, this would include parameters such as the directory where to look and the type of files to load from that directory. These Lister Parameters are documented by each Lister implementation in its class documentation.

These Lister Parameters are to be provided to the AddListToBatch method, when configuring a list for Batch Loading, or to the ProcessList method when executing Direct Loads.

Inventory

Parameters Properties Methods Queries Indices ForeignKeys Triggers
27 40


Summary

Properties
Configuration

Methods
%AddToSaveSet %ClassIsLatestVersion %ClassName %ConstructClone
%DispatchClassMethod %DispatchGetModified %DispatchGetProperty %DispatchMethod
%DispatchSetModified %DispatchSetMultidimProperty %DispatchSetProperty %Extends
%GetParameter %IsA %IsModified %New
%NormalizeObject %ObjectModified %OriginalNamespace %PackageName
%RemoveFromSaveSet %SerializeObject %SetModified %ValidateObject
AddListToBatch BuildExtId BuildExtIdFromName DefaultProcessor
ExpandList FormatParams GetAlias GetExtidPrefix
GetGroupId GetGroupName Init ProcessList
ProcessVirtualList RegisterFixedMetadata SetConfig SetConverter
SetProcessor SplitExtId TestParams

Subclasses
%iKnow.DeepSee.Lister %iKnow.Source.Domain.Lister %iKnow.Source.File.Lister
%iKnow.Source.Global.Lister %iKnow.Source.RSS.Lister %iKnow.Source.SQL.Lister
%iKnow.Source.Temp.Lister

Properties

• property Configuration as %String;

Methods

• final method AddListToBatch(listargs...) as %Status

This method is used to register a list the Lister implementation will later on scan through as part of the execution of the %iKnow.Source.Loader ProcessBatch process. This method takes this Lister implementations Lister Parameters as its arguments, as specified in the class documentation of this Lister implementation.

• final classmethod BuildExtId(domainId As %Integer, listerId As %Integer, groupId As %Integer, localRef As %String, Output sc As %Status = $$$OK) as %String

This method will assemble an External ID, starting from the lister ID, group ID and local reference.

The exact implementation of combining the group name and local reference into a full reference is delegated to BuildFullRef method of the specific Lister implementation referenced by the listerId.

• final classmethod BuildExtIdFromName(domainId As %Integer, groupName As %String, localRef As %String, Output sc As %Status = $$$OK) as %String

This method will, assuming it is called for the appropriate Lister class, build the External ID based on the group name and local reference.

WARNING: this method will throw an error if called from the abstract Lister class, as this combination of groupName and localRef is specific to the Lister implementation class.

• classmethod DefaultProcessor() as %String

This method returns the default %iKnow.Source.Processor class to use (without any parameters) if none was registered explicitly through calls to SetProcessor. By default, this selects (if it exists) a class called Processor in the same package as this Lister implementation, but subclasses might wish to override this and hardcode a specific default Processor to use.

• method ExpandList(listparams As %List) as %Status

This method should be overridden by subclasses, implementing how they scan through the particular type of source location or structures they specialize in. The arguments for this method are the same Lister Parameters as those used when issuing the corresponding AddListToBatch call and are specified and documented by the Lister implementation.

When expanding the list, the Lister should build a "Composite reference": a %List containing the lister ID, the group ID and the local reference for each (candidate) source it found and pass that to either a StoreRef, StoreTemp or StoreTempStream call. Optionally, it can store metadata for each of these refs using the SetMetadataValues method.

NOTE: This method is used by the iKnow loading frameworkand should never be called by custom code.

• classmethod FormatParams(listerParams As %List) as %String

Utility method to format the parameter string passed in AddList for display by the %iKnow.Source.Loader.GetCurrentLists() method. Defaults to $lts() but should be overridden to nicen up complex datatypes in the parameter list.

• classmethod GetAlias() as %String

This method returns the simple alias for this Lister class, to be prefixed with a colon. If this method returns the empty string, the Lister Reference will start with the full Lister class name rather than this alias (prefixed with a colon)

• final classmethod GetExtidPrefix() as %String
This utility method provides the prefix that is prepended to the Full Reference
• final classmethod GetGroupId(domId As %Integer, listerId As %Integer, groupName As %String) as %Integer

Utility method to retrieve the group ID corresponding to a partiular Group Name, for a given domain and lister ID, or zero when the group name is not recognized.

• final classmethod GetGroupName(domId As %Integer, listerId As %Integer, groupId As %Integer, Output sc As %Status = $$$OK) as %String

Utility method to retrieve the Group Name corresponding to a particular group ID, for a given domain and lister ID. An error is passed through the sc output parameter if no group was found for this ID.

• method Init(config As %String, processor As %String, processorParams As %List = "", converter As %String = "", converterParams As %List = "") as %Status

Shorthand method invoking SetConfig, SetProcessor and SetConverter in one call. A Lister can be re-initialized between calls to AddListToBatch or ProcessList, resulting in different settings to be used for the respective lists.

• final method ProcessList(listerParams...) as %Status

Wrapper method to process a single List in one call. This method instantiates a %iKnow.Source.Loader object, registers itself with it and then calls the ProcessList methodon the Loader with the supplied parameters.

This method takes the Lister Parameters for this particular Lister implementation.

• final method ProcessVirtualList(listerParams...) as %Status

Same as ProcessList, but sources will be added as Virtual Sources.

• final method RegisterFixedMetadata(pKeys As %List, pValues As %List) as %Status
Registers fixed metadata values pValues for the metadata fields in pKeys, for all sources to be listed as part of the next ProcessList or AddListToBatch calls, until the next call to RegistereFixedMetadata. The keys and values in pKeys and pValues should correspond positionally.
• final method SetConfig(ByRef config As %String) as %Status

Registers the %iKnow.Source.Configuration name to use when indexing sources from from the lists registered through AddListToBatch or ProcessList calls onwards. Using this method to set a different Configuration between two AddListToBatch calls will not impact any lists already registered in earlier calls.

• final method SetConverter(converter As %String, convparams As %List) as %Status

Registers the %iKnow.Source.Converter class and parameters to use when indexing sources from from the lists registered through AddListToBatch or ProcessList calls onwards. Using this method to set a different Converter between two AddListToBatch calls will not impact any lists already registered in earlier calls.

• final method SetProcessor(processor As %String, processorParams As %List) as %Status

Registers the %iKnow.Source.Processor class and parameters to use when indexing sources from from the lists registered through AddListToBatch or ProcessList calls onwards. Using this method to set a different Processor between two AddListToBatch calls will not impact any lists already registered in earlier calls.

• final classmethod SplitExtId(domainId As %Integer, extId As %String, Output listerId As %Integer, Output groupId As %Integer, Output localRef As %String) as %Status

This method will split a complete External ID into the lister reference, group name and local reference and return the corresponding lister ID, group ID and local reference.

The exact implementation of splitting the full reference into a group name and local reference is delegated to SplitFullRef method of the specific Lister implementation as referenced by the lister reference, which is the first part of the full External ID.

• method TestParams(listerParams...) as %Status

This method is called at the start of ProcessList and AddListToBatch to validate the supplied Lister Parameters. Subclasses should override this method to execute the validation logic specific to their Lister Parameters.



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