Package org.odpi.openmetadata.frameworks.connectors

Class ConnectorBase

java.lang.Object
org.odpi.openmetadata.frameworks.connectors.Connector
org.odpi.openmetadata.frameworks.connectors.ConnectorBase
All Implemented Interfaces:
SecureConnectorExtension
Direct Known Subclasses:
ApacheAtlasRESTConnector, ApacheKafkaAdminConnector, BasicFileStoreConnector, BasicFolderConnector, DataEngineConnectorBase, DataFolderConnector, DiscoveryService, GovernanceActionServiceConnector, IntegrationConnectorBase, JDBCResourceConnector, LineageGraphConnector, OMAGServerConfigStoreConnectorBase, OMRSAuditLogStoreConnectorBase, OMRSCohortRegistryStoreConnectorBase, OMRSRepositoryConnector, OMRSRepositoryEventMapperConnector, OMRSTopicConnector, OpenMetadataArchiveStoreConnector, OpenMetadataPlatformSecurityConnector, OpenMetadataServerSecurityConnector, OpenMetadataTopicConnector, OpenMetadataTopicConsumerBase, RepositoryGovernanceServiceConnector, RESTClientConnector, SecretsStoreConnector, SurveyActionServiceConnector
public abstract class ConnectorBase extends Connector implements SecureConnectorExtension
The ConnectorBase is an implementation of the Connector interface.

Connectors are client-side interfaces to assets such as data stores, data sets, APIs, analytical functions. They handle the communication with the server that hosts the assets, along with the communication with the metadata server to serve up metadata about the assets, and support for an audit log for the caller to log its activity.

Each connector implementation is paired with a connector provider. The connector provider is the factory for connector instances.

The Connector interface defines that a connector instance should be able to return a unique identifier, a connection object and a metadata properties object for its connected asset. These are supplied to the connector during its initialization.

The ConnectorBase base class implements all the methods required by the Connector interface. Each specific implementation of a connector then extends this interface to add the methods to work with the particular type of asset it supports. For example, a JDBC connector would add the standard JDBC SQL interface, the OMRS Connectors add the metadata repository management APIs...

  • Field Details

  • Constructor Details

    • ConnectorBase

      public ConnectorBase()
      Typical Constructor: Connectors should always have a constructor requiring no parameters and perform initialization in the initialize method.

  • Method Details

    • initialize

      public void initialize(String connectorInstanceId, ConnectionProperties connectionProperties)
      Call made by the ConnectorProvider to initialize the Connector with the base services.
      Specified by:
      initialize in class Connector
      Parameters:
      connectorInstanceId - unique id for the connector instance useful for messages etc
      connectionProperties - POJO for the configuration used to create the connector.

    • getConnectorInstanceId

      public String getConnectorInstanceId()
      Returns the unique connector instance id that assigned to the connector instance when it was created. It is useful for error and audit messages.
      Specified by:
      getConnectorInstanceId in class Connector
      Returns:
      guid for the connector instance

    • getConnection

      public ConnectionProperties getConnection()
      Returns the connection object that was used to create the connector instance. Its contents are never refreshed during the lifetime of the connector instance, even if the connection information is updated or removed from the originating metadata repository.
      Specified by:
      getConnection in class Connector
      Returns:
      connection properties object

    • initializeConnectedAssetProperties

      public void initializeConnectedAssetProperties(ConnectedAssetProperties connectedAssetProperties)
      Set up the connected asset properties object. This provides the known metadata properties stored in one or more metadata repositories. The properties are populated whenever getConnectedAssetProperties() is called.
      Specified by:
      initializeConnectedAssetProperties in class Connector
      Parameters:
      connectedAssetProperties - properties of the connected asset

    • initializeSecretsStoreConnector

      public void initializeSecretsStoreConnector(String displayName, SecretsStoreConnector secretsStoreConnector)
      Set up information about an embedded connector that this connector can use to support secure access to its resources.
      Specified by:
      initializeSecretsStoreConnector in interface SecureConnectorExtension
      Parameters:
      displayName - name of the secrets store
      secretsStoreConnector - an embedded secrets store connector

    • getConnectedAssetProperties

      public ConnectedAssetProperties getConnectedAssetProperties(String userId) throws PropertyServerException, UserNotAuthorizedException
      Returns the properties that contain the metadata for the asset. The asset metadata is retrieved from the metadata repository and cached in the ConnectedAssetProperties object each time the getConnectedAssetProperties method is requested by the caller. Once the ConnectedAssetProperties object has the metadata cached, it can be used to access the asset property values many times without a return to the metadata repository. The cache of metadata can be refreshed simply by calling this getConnectedAssetProperties() method again.
      Specified by:
      getConnectedAssetProperties in class Connector
      Parameters:
      userId - userId of requesting user
      Returns:
      ConnectedAssetProperties connected asset properties
      Throws:
      PropertyServerException - indicates a problem retrieving properties from a metadata repository
      UserNotAuthorizedException - indicates that the user is not authorized to access the asset properties.

    • start

      public void start() throws ConnectorCheckedException
      Indicates that the connector is completely configured and can begin processing.
      Specified by:
      start in class Connector
      Throws:
      ConnectorCheckedException - there is a problem within the connector.

    • getSuppliedPlaceholderProperties

      protected Map<String,String> getSuppliedPlaceholderProperties(Map<String,Object> configurationProperties)
      Pass the configuration properties as placeholder properties. This allows the caller to supply additional properties to a template beyond those envisaged in the connector implementation. The templating process is not affected if properties not use in the template are supplied
      Parameters:
      configurationProperties - supplied configuration properties
      Returns:
      placeholder properties map

    • getArrayConfigurationProperty

      protected List<String> getArrayConfigurationProperty(String propertyName, Map<String,Object> configurationProperties)
      Retrieve a configuration property that is a comma-separated list of strings.
      Parameters:
      propertyName - name of property
      configurationProperties - configuration properties
      Returns:
      list of strings or null if not set

    • getBooleanConfigurationProperty

      protected boolean getBooleanConfigurationProperty(String propertyName, Map<String,Object> configurationProperties)
      Retrieve a configuration property that is a boolean. If any non-null value is set it returns true unless the value is set to FALSE, False or false.
      Parameters:
      propertyName - name of property
      configurationProperties - configuration properties
      Returns:
      boolean flag or false if not set

    • getIntConfigurationProperty

      protected int getIntConfigurationProperty(String propertyName, Map<String,Object> configurationProperties)
      Retrieve a configuration property that is an integer.
      Parameters:
      propertyName - name of property
      configurationProperties - configuration properties
      Returns:
      integer value or zero if not supplied

    • getStringConfigurationProperty

      protected String getStringConfigurationProperty(String propertyName, Map<String,Object> configurationProperties)
      Retrieve a configuration property that is a string or null if not set.
      Parameters:
      propertyName - name of property
      configurationProperties - configuration properties
      Returns:
      string value of property or null if not supplied

    • throwNoAsset

      protected void throwNoAsset(String assetGUID, String connectorName, String methodName) throws ConnectorCheckedException
      Log that no asset has been returned to the connector. It is unable to proceed without this basic information.
      Parameters:
      assetGUID - the unique identifier of the asset from the discovery context
      connectorName - name of the connector
      methodName - calling method
      Throws:
      ConnectorCheckedException - resulting exception

    • throwWrongTypeOfAsset

      protected void throwWrongTypeOfAsset(String assetGUID, String assetType, String supportedAssetType, String connectorName, String methodName) throws ConnectorCheckedException
      Log that the connector can not process the type of asset it has been passed.
      Parameters:
      assetGUID - identifier of the asset
      assetType - type of the asset
      supportedAssetType - supported asset types
      connectorName - name of the connector
      methodName - calling method
      Throws:
      ConnectorCheckedException - resulting exception

    • throwWrongTypeOfResource

      protected void throwWrongTypeOfResource(String assetGUID, String assetTypeName, String assetResourceName, String assetResourceType, String supportedResourceType, String connectorName, String methodName) throws ConnectorCheckedException
      Log that the connector can not process the type of asset it has been passed.
      Parameters:
      assetGUID - identifier of the asset
      assetTypeName - type of the asset
      assetResourceName - name of the resource
      assetResourceType - type of the resource
      supportedResourceType - supported resource types
      connectorName - name of the connector
      methodName - calling method
      Throws:
      ConnectorCheckedException - resulting exception

    • throwMissingResource

      protected void throwMissingResource(String assetGUID, String assetTypeName, String assetResourceName, String methodName) throws ConnectorCheckedException
      Log that the connector can not process the type of asset it has been passed.
      Parameters:
      assetGUID - identifier of the asset
      assetTypeName - type of the asset
      assetResourceName - name of the resource
      methodName - calling method
      Throws:
      ConnectorCheckedException - resulting exception

    • throwWrongTypeOfRootSchema

      protected void throwWrongTypeOfRootSchema(String assetGUID, String rootSchemaType, String supportedRootSchemaType, String connectorName, String methodName) throws ConnectorCheckedException
      Log that the survey action service can not process the type of root schema it has been passed.
      Parameters:
      assetGUID - identifier of the asset
      rootSchemaType - type of the root schema
      supportedRootSchemaType - supported root schema types
      connectorName - name of the connector
      methodName - calling method
      Throws:
      ConnectorCheckedException - resulting exception

    • getAssetTypeName

      protected String getAssetTypeName(AssetUniverse asset, String connectorName, String methodName) throws ConnectorCheckedException
      Return the type name for the asset. An exception is thrown if the type name is not available.
      Parameters:
      asset - asset universe
      connectorName - name of the connector
      methodName - calling method
      Returns:
      asset's type name
      Throws:
      ConnectorCheckedException - resulting exception

    • getNetworkAddresses

      protected List<String> getNetworkAddresses(AssetUniverse asset)
      Return the network address of this asset.
      Parameters:
      asset - asset to extract address from
      Returns:
      the list of network addresses

    • disconnect

      public void disconnect() throws ConnectorCheckedException
      Free up any resources held since the connector is no longer needed.
      Specified by:
      disconnect in class Connector
      Throws:
      ConnectorCheckedException - there is a problem within the connector.

    • disconnectConnectors

      protected void disconnectConnectors(List<Connector> activeConnectors)
      Disconnect all the connectors in the supplied list. Any failures are ignored. This method is typically used by virtual connectors to disconnect their embedded connectors.
      Parameters:
      activeConnectors - connectors to disconnect.

    • isActive

      public boolean isActive()
      Return a flag indicating whether the connector is active. This means it has been started and not yet disconnected.
      Returns:
      isActive flag

    • hashCode

      public int hashCode()
      Provide a common implementation of hashCode for all OCF Connector objects. The UUID is unique and is randomly assigned and so its hashCode is as good as anything to describe the hash code of the connector object.
      Overrides:
      hashCode in class Object
      Returns:
      random UUID as hashcode

    • equals

      public boolean equals(Object object)
      Provide a common implementation of equals for all OCF Connector Provider objects. The UUID is unique and is randomly assigned and so its hashCode is as good as anything to evaluate the equality of the connector provider object.
      Overrides:
      equals in class Object
      Parameters:
      object - object to test
      Returns:
      boolean flag

    • toString

      public String toString()
      Standard toString method.
      Overrides:
      toString in class Object
      Returns:
      print out of variables in a JSON-style