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|Oracle Directory Server Enterprise Edition Developer's Guide 11 g Release 1 (220.127.116.11.0)|
This section describes how extended operations are handled by Directory Server. This section also describes what requirements are placed on extended operation plug-ins.
Directory Server identifies extended operations by object identifiers (OIDs). Clients request an operation by sending an extended operation request, specifying the following:
The OID of the extended operation
Data specific to the extended operation
Upon receiving an extended operation request, Directory Server calls the plug-in registered to handle the OID that is sent in the request. The plug-in function that handles the request obtains the OID and operation-specific data. The plug-in processes the info, then sends a response to the client that contains an OID as well as additional data that pertains to the extended operation.
When implementing extended operation support, you need to determine which OID to use. The Internet Assigned Numbers Authority helps with registration of official OIDs. If you select your own OIDs, you must avoid OIDs that conflict with other OIDs. In particular, do not use OIDs that conflict with OIDs defined by the LDAP schema used by Directory Server.
Directory Server determines which extended operation plug-ins handle which extended operation OIDs at startup. Directory Server then calls the initialization function for each plug-in. Extended operation plug-ins register the extended operation OIDs the plug-ins handle as part of their initialization function, as described in Initializing the Extended Operation Plug-In.
The configuration entry for a plug-in can include parameters that Directory Server passes to the plug-in initialization function at startup. These parameters are described in Retrieving Arguments Passed to Plug-Ins. The parameters allow for the possibility that OIDs are determined after the plug-in functionality is written. Such OIDs can be passed as configuration entry arguments.