About singleton objects
Singletons are objects that only support one instance of the object. When multiple instances are created, every object references the same instance. It is a good practice to release the singletons using com.esri.system.Cleaner.release() method.
The following table lists the singleton objects in ArcGIS:
|
Class
|
Library
|
Location
|
| AccessWorkspaceFactory | DataSourcesGDB | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| ActionEnvironment | TrackingAnalyst | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AGAnimationUtils | Animation | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AGSServerConnectionFactory | GISClient | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AMSWorkspaceFactory | TrackingAnalyst | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AnimationControlsDialog | AnimationUI | ArcGIS Desktop |
| AnimationCreateKeyframeDialog | AnimationUI | ArcGIS Desktop |
| AnimationFromPathDialog | AnimationUI | ArcGIS Desktop |
| AnimationLayerGroupDialog | AnimationUI | ArcGIS Desktop |
| AnimationManagerDialog | AnimationUI | ArcGIS Desktop |
| AnimationTypeCamera | 3DAnalyst | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AnimationTypeGlobeCamera | GlobeCore | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AnimationTypeGlobeLayer | GlobeCore | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AnimationTypeLayer | 3DAnalyst | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AnimationTypeMapLayer | Animation | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AnimationTypeMapView | Animation | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AnimationTypeScene | 3DAnalyst | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AnimationTypeTimeLayer | Animation | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| AppRef | Framework | ArcGIS Desktop |
| ArcInfoWorkspaceFactory | DataSourcesFile | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| ArcMapSurveyExtension | SurveyExt | ArcGIS Desktop |
| CadWorkspaceFactory | DataSourcesFile | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| CieLabConversion | Display | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| CommandsEnvironment | Controls | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| DddEnvironment | 3DAnalystUI | ArcGIS Desktop |
| DddServerEnvironment | Geodatabase | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| DDDToolbarEnvironment | 3DAnalystUI | ArcGIS Desktop |
| DEGdbUtilities | Geodatabase | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| DEUtilities | Geoprocessing | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| DummyGraduatedMarkerLayer | Carto | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| DummyLayer | Carto | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| EngineEditor | Controls | ArcGIS Engine |
| EngineInkEnvironment | Controls | ArcGIS Engine |
| EngineNetworkAnalystEnvironment | Controls | ArcGIS Engine |
| EnvironmentManager | System | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| ErrorDialog | SystemUtility | ArcGIS Engine (C++ only) |
| ErrorMessage | SystemUtility | ArcGIS Engine (C++ only) |
| ExcelWorkspaceFactory | DataSourcesOleDB | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| ExtensionManager | System | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| FileGDBWorkspaceFactory | DataSourcesGDB | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| FindDialog | CatalogUI | ArcGIS Desktop |
| FormatList | DataSourcesRaster | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| GeoDatabaseHelper | Geodatabase | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| GMxEffectsToolbarEnvironment | ArcGlobe | ArcGIS Desktop |
| GPGlobeFunctionFactory | GlobeCore | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| GPHolder | Geoprocessing | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| GPSAUtil | SpatialAnalyst | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| GPServerFunctionFactory | Geoprocessing | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| GpsPositionDialog | ArcMapUI | ArcGIS Desktop |
| GPUtilities | Geoprocessing | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| GxCatalogROT | CatalogUI | ArcGIS Desktop |
| GxDatabaseExtensions | Catalog | ArcGIS Desktop |
| IdentifyDialog | CartoUI | ArcGIS Desktop |
| IMSWorkspaceFactory | GISClient | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| InMemoryWorkspaceFactory | DataSourcesGDB | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| LabelEnvironment | Carto | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| LayerEffectsEnvironment | ArcMapUI | ArcGIS Desktop |
| LocatorManager | Location | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| MemoryRelationshipClassFactory | Geodatabase | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| MetadataSynchronizer | Geodatabase | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| MonitorSettings | Display | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| MyPlaceCollection | Controls | ArcGIS Engine |
| NADirectionsWindowManager | NetworkAnalystUI | ArcGIS Desktop |
| NetCDFWorkspaceFactory | DataSourcesNetCDF | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| NetworkIdentifyDialog | NetworkAnalystUI | ArcGIS Desktop |
| OLEDBWorkspaceFactory | DataSourcesOleDB | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| PCCoverageWorkspaceFactory | DataSourcesFile | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| RasterAnalysisToolbarEnvironment | SpatialAnalystUI | ArcGIS Desktop |
| RasterAttributeTableManager | DataSourcesRaster | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| RasterDefaultsEnv | Carto | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| RasterSettings | SpatialAnalystUI | ArcGIS Desktop |
| RasterStatus | DataSourcesRaster | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| RasterWorkspaceFactory | DataSourcesRaster | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| RelQueryTableFactory | Geodatabase | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| SAExtension | SpatialAnalystUI | ArcGIS Desktop |
| SchematicProjectMgr | Schematic | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| SchematicWorkspaceFactory | Schematic | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| ScratchWorkspaceFactory | DataSourcesGDB | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| SDCWorkspaceFactory | DataSourcesFile | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| SdeWorkspaceFactory | DataSourcesGDB | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| SelectionEnvironment | Carto | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| ServerStyleGallery | Display | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| ShapefileWorkspaceFactory | DataSourcesFile | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| SpatialReferenceEnvironment | Geometry | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| StreetMapWorkspaceFactory | DataSourcesFile | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| StyleGallery | Framework | ArcGIS Desktop |
| SurveyDatabaseEnvironment | SurveyExt | ArcGIS Desktop |
| SurveySnapAgentManager | SurveyExt | ArcGIS Desktop |
| SxAnimationEnvironment | 3DAnalyst | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| SxEffectsToolbarEnvironment | ArcScene | ArcGIS Desktop |
| SymbologyEnvironment | Display | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| SystemHelper | System | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| TAExtension | TrackingAnalystUI | ArcGIS Desktop |
| TextFileWorkspaceFactory | DataSourcesOleDB | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| TexturePersistenceProperties | Geometry | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| TinWorkspaceFactory | DataSourcesFile | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| TMS_MarshalHelper | TrackingAnalyst | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| ToolboxWorkspaceFactory | Geoprocessing | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| TrackingEnvironment | TrackingAnalyst | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| UOMFormatEnvironment | SurveyExt | ArcGIS Desktop |
| VpfWorkspaceFactory | DataSourcesFile | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| WMSConnectionFactory | GISClient | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| WorkspaceFactory | Geodatabase | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |
| XMLTypeMapper | System | ArcGIS Desktop, ArcGIS Engine, ArcGIS Server |