Scheduler interface

A scheduler object exists in the JNDI namespace for each scheduler configuration. A reference to a scheduler can be obtained by performing a lookup on the JNDI name; however, the lookup is valid only from the server process where the scheduler instance exists. Once a reference has been obtained, tasks can be created, suspended, cancelled, and so on, if the caller has access to the scheduler instance.

For details, see the Interface Scheduler in the Javadoc.

Task creation
The task is created in the persistent store using the caller's global transactional context if present. See the topic Transactions and the scheduler service for more details. Since this is a transactional operation, the task cannot be run or modified from another thread until the current transaction commits.
Task modification
Tasks that have been created can be modified with the suspend(), resume(), cancel(), and purge() methods. These methods take a Task Identifier string as a parameter, which is generated by the create() method and can be found in the TaskStatus object. If a task is currently running or being modified by another thread, an operation that attempts to modify the state of the task does not block on the attempt, but a TaskPending exception is thrown. The operation can be reattempted at another time. Tasks can only be modified by the same application (EAR file) that was used to create the task.
Task execution
Tasks are executed in the thread pool specified by the configuration's work manager, under the security ID of the task creator. If multiple schedulers are configured to share the same database table, the tasks found in the table can be executed on any of the schedulers, whether or not they are in the same server, node, or cell.
Task lookup
Tasks can be located using the Name property that was assigned at creation time. This is useful when you need to modify a group of tasks and tracking individual task ID's is not convenient.


Related tasks
Developing and scheduling tasks
Managing the scheduler service
Related reference
TaskInfo interface
TaskHandler interface
NotificationSink interface
UserCalendar interface



Searchable topic ID:   rsch_scheduler
Last updated: Jun 21, 2007 8:07:48 PM CDT    WebSphere Business Integration Server Foundation, Version 5.0.2
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