| Title: Image Load Flow |
| * vcld daemon is running |
| ** polls database every 12 seconds to check if the management node has any |
| reservations which need to be processed |
| * vcld finds a reservation that needs to be processed |
| * vcld gathers all of the information for the reservation from the database |
| by calling utils.pm::get_request_info() and then a DataStructure object is |
| created |
| * vcld creates a new state object |
| ** a new state object is created based on the request.stateid column for |
| the reservation |
| ** the main state modules are new.pm, image.pm, reserved.pm, reclaim.pm |
| * the constructor for all of the state modules is Module.pm::new() |
| * this constructor automatically calls an initialize() subroutine if |
| initialize() has been implemented for the class being constructed |
| * State.pm contains an initialize() subroutine, and all of the state |
| modules (new.pm, image.pm...) inherit from State.pm so the initialize() |
| subroutine in State.pm is automatically called when vcld creates the state |
| object |
| * State.pm::initialize() creates an OS object based on the OS of |
| the image assigned to the reservation |
| * State.pm::initialize() creates a provisioning engin object based on |
| the provisioning engine of the computer assigned to the reservation |
| * vcld forks a new process for the newly created state object |
| * the new process calls the state module's process() subroutine |
| * process() performs all of the tasks needed to process the reservation, |
| returns true if successful, false if failed |
