Directory server plug-in call ordering

• US 8,332,493 B2
• Filed: 12/08/2011
• Issued: 12/11/2012
• Est. Priority Date: 02/28/2007
• Status: Active Grant

• Current Assignee: Red Hat, Inc. (International Business Machines Corporation)
• Original Assignee: Red Hat, Inc. (International Business Machines Corporation)
• Inventors: Rowley, Peter, Hosoi, Noriko
• Primary Examiner(s): RECEK, JASON D
• Application Number:
  US13/315,217
• Publication Number:
  US 20120084409A1
• Time in Patent Office: 369 Days
• Field of Search: 709/220, 709/221
• US Class Current: 709/220
• CPC Class Codes: G06F 15/16 Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs coordinating program control therefor G06F9/52; in regulating and control system G05B
• CPC Class Codes: G06F 16/282 Hierarchical databases, e.g. IMS, LDAP data stores or Lotus Notes
• CPC Class Codes: H04L 61/4523 using lightweight directory access protocol [LDAP]

Abstract

A method and apparatus for ordering callbacks for server plug-ins of a Lightweight Directory Access Protocol (LDAP) directory server. Each plug-in registers with the LDAP server and has a designated priority and set of dependencies. The priority and dependency data are stored in an LDAP callback configuration entry or set of entries. The LDAP server analyzes the priority and dependencies to determine the order of each plug-in or individual callback relative to one another. This allows the LDAP directory server and LDAP operations to rely on the order of callbacks thereby improving the efficiency of the system.

Claims

1. A method comprising:

retrieving, by a computing device executing a lightweight directory access protocol (LDAP) directory server, first callback data and second callback data from a first LDAP directory server plug-in;

inserting, by the computing device, the first callback data into a callback list at a first position and the second callback data into the callback list at a second position, the callback list determining an order of relative execution for a plurality of callbacks;

receiving a request to perform an operation that utilizes the first callback data and a third callback data of a second LDAP directory server plug-in;

making a determination of a relative order of the first callback data and the third callback data in the callback list;

executing a third callback associated with the third callback data before executing a first callback associated with the first callback data if the third callback data is ordered before the first callback data in the callback list; and

executing the first callback before executing the third callback if the first callback data is ordered before the third callback data in the callback list.

2. The method of claim 1, further comprising calling a plug-in initialization process that starts plug-ins in a determined order.

3. The method of claim 1, further comprising receiving a registration request from the first LDAP directory server plug-in.

4. The method of claim 1, further comprising processing a call according to a position of the first LDAP directory server plug-in in the callback list.

5. The method of claim 1, wherein a position of the first callback data in the callback list indicates an order for executing all callbacks of the first LDAP directory server plug-in.

6. The method of claim 1, wherein the first callback data comprises at least one of priority data or dependency data, and wherein the first callback data is inserted into a position in the callback list based on at least one of the priority data or the dependency data.

7. The method of claim 1, further comprising:

controlling a start up order of the first plug-in and the second plug-in during a boot up sequence for the LDAP directory server.

8. The method of claim 1, wherein the callback list further determines an order of relative execution of a plurality of plug-ins, wherein callback data associated with the plurality of plug-ins is inserted into the callback list.

9. A computing device comprising:

a memory to store instructions for a lightweight directory access protocol (LDAP) directory server; and

a processing device, coupled to the memory, to execute the instructions, wherein the processing device is configured to;

retrieve first callback data and second callback data from a first LDAP directory server plug-in;

insert the first callback data into a callback list at a first position and the second callback data into the callback list at a second position, the callback list determining an order of relative execution for a plurality of callbacks;

receive a request to perform an operation that utilizes the first callback data and third callback data of a second LDAP directory server plug-in;

make a determination of a relative order of the first callback data and the third callback data in the callback list;

execute a third callback associated with the third callback data before executing a first callback associated with the first callback data if the third callback data is ordered before the first callback data in the callback list; and

execute the first callback before executing the third callback if the first callback data is ordered before the third callback data in the callback list.

10. The computing device of claim 9, wherein the processing device is further configured to process a call according to a position of the first LDAP directory server plug-in in the callback list.

11. The computing apparatus of claim 9, wherein a position of the first callback data in the callback list indicates an order for executing all callbacks of the first LDAP directory server plug-in.

12. The computing apparatus of claim 9, wherein the first callback data comprises at least one of priority data or dependency data, and wherein the first callback data is inserted into a position in the callback list based on at least one of the priority data or the dependency data.

13. The computing device of claim 9, wherein the processing device is further configured to control a start up order of the first plug-in and the second plug-in during a boot up sequence for the LDAP directory server.

14. The computing device of claim 9, wherein the callback list further determines an order of relative execution of a plurality of plug-ins, wherein callback data associated with the plurality of plug-ins is inserted into the callback list.

15. A non-transitory machine readable medium having instructions that, when executed by a computing device, cause the computing device to perform a method comprising:

retrieving, by the computing device executing a lightweight directory access protocol (LDAP) directory server, first callback data and second callback data from a first LDAP directory server plug-in;

inserting, by the computing device, the first callback data into a callback list at a first position and the second callback data into the callback list at a second position, the callback list determining an order of relative execution for a plurality of callbacks;

receiving a request to perform an operation that utilizes the first callback data and third callback data of a second LDAP directory server plug-in;

making a determination of a relative order of the first callback data and the third callback data in the callback list;

executing a third callback associated with the third callback data before executing a first callback associated with the first callback data if the third callback data is ordered before the first callback data in the callback list; and

executing the first callback before executing the third callback if the first callback data is ordered before the third callback data in the callback list.

16. The non-transitory machine readable medium of claim 15, the method further comprising processing a call according to a position of the first LDAP directory server plug-in in the callback list.

17. The non-transitory machine readable medium of claim 15, wherein a position of the first callback data in the callback list indicates an order for executing all callbacks of the first LDAP directory server plug-in.

18. The non-transitory machine readable medium of claim 15, wherein the first callback data comprises at least one of priority data or dependency data, and wherein the first callback data is inserted into a position in the callback list based on at least one of the priority data or the dependency data.

19. The non-transitory machine readable medium of claim 15, the method further comprising controlling a start up order of the first plug-in and the second plug-in during a boot up sequence for the LDAP directory server.

20. The non-transitory machine readable medium of claim 15, wherein the callback list further determines an order of relative execution of a plurality of plug-ins, wherein callback data associated with the plurality of plug-ins is inserted into the callback list.