PeopleSoft Process Scheduler Architecture
End users need to be concerned only with successfully submitting process requests, monitoring their progress, and viewing their output in Report Manager. However, they also should understand how each part of PeopleSoft Process Scheduler functions.
The following sections describe the role of each of the basic components in a three-tier environment.
PeopleSoft Application Server
The application server runs the appropriate SQL against the database to add a row to the Process Request table (PSPRCSRQST) for the submitted process request. Process Monitor also uses SQL to fetch the process status from the Process Request table.
Note: In this context, application server refers to the physical machine on which the PeopleSoft Application Server runs. The PeopleSoft Application Server is the actual set of server processes that are controlled by Oracle Tuxedo. The PeopleSoft Process Scheduler Server is a separate component that does not necessarily need to run on the application server.
PeopleSoft Process Scheduler Server Agent
The PeopleSoft Process Scheduler Server Agent is the component that resides on a server and runs as a process; that is, after it is initiated, it runs continuously in the background and requires no user interaction until it receives a request to shut down. Although the PeopleSoft Process Scheduler Server can run on the application server machine, it can also run on any supported batch server or database server.
As with each of the server processes, such as PSAPPSRV, that run within a PeopleSoft Application Server domain, the PeopleSoft Process Scheduler Server maintains its own SQL connection to the database server.
The PeopleSoft Process Scheduler Server Agent becomes idle for a specified interval of time so that it does not consume server resources. It continues alternating between being idle and active until the database administrator stops it manually.
The PeopleSoft Process Scheduler Server Agent polls the Process Request table at a regular, user-defined interval to determine whether any process requests have been directed toward the server. If so, it starts the appropriate process, based on the requested run date and time. The agent also updates the run status of that process instance to Initiated and updates the session ID with the process ID (PID) of that process.
After the PeopleSoft Process Scheduler Server Agent initiates a process, the started process—if it is API-Aware—is responsible for updating the Run Status column in PSPRCSRQST accordingly. However, during the polling cycle, the agent also:
Cancels (at the operating system-level) processes that have been canceled through the Process Monitor.
Checks for processes with a run status of Initiated and Processing to determine whether these processes are actually running.
To make this determination, it uses the PID that is stored in the database when the process is started. If the PID does not exist, the process is then set to Error.
The database server houses the Process Request tables that contain a variety of data that are related to the requests, such as command line parameters, output options, and process status.
Report distribution in the PeopleSoft system is closely associated with PeopleSoft Process Scheduler. Process Scheduler uses the PeopleSoft Process Scheduler Server Agent to run the reports and log files that you submit using a process request. When they have finished, the Distribution Agent transfers these reports and log files to the Report Repository where you can view them from a web browser using PeopleSoft Pure Internet Architecture. You can transfer the following files to the Report Repository:
Report distribution options enable you to restrict access to these reports based on user ID or role ID, as defined in PeopleSoft Security Administration.
For the Distribution Agent to pass authentication, you must ensure that the following rules are enforced:
The user ID that you use to start the Process Scheduler server must include the ProcessSchedulerAdmin role.
On the Report Node Definition page, the Universal Resource Locator (URL) Host must contain a fully qualified name.
If you specify the Auth Token Domain name during the PeopleSoft Pure Internet Architecture installation, you must also include the domain name on the URL Host.
The Distribution Agent process runs on the same server as the PeopleSoft Process Scheduler Server Agent. When you use the Server Definition page to set up the PeopleSoft Process Scheduler Server Agent with a distribution node, either the PeopleSoft Process Scheduler Server Agent or Oracle Tuxedo starts the Distribution Agent, depending on the operating system in which you start PeopleSoft Process Scheduler. In Windows and UNIX, Oracle Tuxedo starts the Distribution Agent, while in OS390, the PeopleSoft Process Scheduler Server Agent starts it.
The PeopleSoft Process Scheduler Server Agent and the Distribution Agent both check the status of each process in the Report List table (PS_CDM_LIST). When the PeopleSoft Process Scheduler Server Agent initiates a process request that has an output destination type of Web, or if the Server Definition page is set up to transfer system log or trace files to Report Manager, then an entry is inserted into the Report List table. When the program that is associated with the process finishes, the status in the Report List table is updated to Generated, indicating that the files are ready to transfer to the Report Repository. In Windows and UNIX, where PeopleSoft Process Scheduler servers are started through Oracle Tuxedo, the Process Scheduler (PSPRCSRV) sends a Tuxedo service to the Distribution Agent (PSDSTSRV) to initiate transferring of reports to the Report Repository. In OS390, the Distribution Agent polls the Report List table to determine which process requests have finished running and then transfers them to Report Repository.
The Report Repository is the designated server where the Distribution Agent transfers reports that are generated from the PeopleSoft Process Scheduler Server. The repository can be set up on either a UNIX or Microsoft Windows machine by installing PeopleSoft Pure Internet Architecture and certified web server software (WebLogic), and can be used by multiple PeopleSoft databases. The Distribution Agent determines the Report Repository to which it should transfer the reports based on the setting that is specified in the server definition. When the Distribution Agent transfers all the files for a specific request, it creates a subdirectory under the designated directory that is specified in the PeopleSoft Pure Internet Architecture as the PSReports home directory, for example: