TaskKit.Scheduler | index /usr/local/share/webware/TaskKit/Scheduler.py

`This is the TaskManager Python package.
It provides a system for running any number of predefined tasks in separate
threads in an organized and controlled manner.
A task in this package is a class derived from the Task class. The task
should have a run method that, when called, performs some task.
The Scheduler class is the organizing object. It manages the addition,
execution, deletion, and well being of a number of tasks. Once you have
created your task class, you call the Scheduler to get it added to the
tasks to be run.`

Classes
`` |  | threading.Thread(threading._Verbose) Scheduler
class Scheduler(threading.Thread)
`` | `The top level class of the TaskManager system. The Scheduler is a thread that handles organizing and running tasks. The Scheduler class should be instantiated to start a TaskManager sessions. Its start method should be called to start the TaskManager. Its stop method should be called to end the TaskManager session.`
| Method resolution order: Scheduler threading.Thread threading._Verbose __builtin__.object Methods defined here: __init__(self, daemon=True) addActionOnDemand(self, task, name) `Add a task to be run only on demand. Adds a task to the scheduler that will not be scheduled until specifically requested.` addDailyAction(self, hour, minute, task, name) `Add an action to be run every day at a specific time. If a task with the given name is already registered with the scheduler, that task will be removed from the scheduling queue and registered anew as a periodic task. Can we make this addCalendarAction? What if we want to run something once a week? We probably don't need that for Webware, but this is a more generally useful module. This could be a difficult function, though. Particularly without mxDateTime.` addPeriodicAction(self, start, period, task, name) `Add a task to be run periodically. Adds an action to be run at a specific initial time, and every period thereafter. The scheduler will not reschedule a task until the last scheduled instance of the task has completed. If a task with the given name is already registered with the scheduler, that task will be removed from the scheduling queue and registered anew as a periodic task.` addTimedAction(self, time, task, name) `Add a task to be run once, at a specific time.` delOnDemand(self, name) `Delete a task with the given name from the onDemand list.` delRunning(self, name) `Delete a task from the running list. Used Internally.` delScheduled(self, name) `Delete a task with the given name from the scheduled list.` demandTask(self, name) `Demand execution of a task. Allow the server to request that a task listed as being registered on-demand be run as soon as possible. If the task is currently running, it will be flagged to run again as soon as the current run completes. Returns False if the task name could not be found on the on-demand or currently running lists.` disableTask(self, name) `Specify that a task be suspended. Suspended tasks will not be scheduled until later enabled. If the task is currently running, it will not be interfered with, but the task will not be scheduled for execution in future until re-enabled. Returns True if the task was found and disabled.` enableTask(self, name) `Enable a task again. This method is provided to specify that a task be re-enabled after a suspension. A re-enabled task will be scheduled for execution according to its original schedule, with any runtimes that would have been issued during the time the task was suspended simply skipped. Returns True if the task was found and enabled.` hasOnDemand(self, name) `Checks whether task with given name is in the onDemand list?` hasRunning(self, name) `Check to see if a task with the given name is currently running.` hasScheduled(self, name) `Checks whether task with given name is in the scheduled list.` isRunning(self) nextTime(self) notify(self) notifyCompletion(self, handle) `Notify completion of a task. Used by instances of TaskHandler to let the Scheduler thread know when their tasks have run to completion. This method is responsible for rescheduling the task if it is a periodic task.` onDemand(self, name, default=None) `Return a task from the onDemand list.` onDemandTasks(self) run(self) `Run task in a background thread. This method is responsible for carrying out the scheduling work of this class on a background thread. The basic logic is to wait until the next action is due to run, move the task from our scheduled list to our running list, and run it. Other synchronized methods such as runTask(), scheduleTask(), and notifyCompletion(), may be called while this method is waiting for something to happen. These methods modify the data structures that run() uses to determine its scheduling needs.` runTask(self, handle) `Run a task. Used by the Scheduler thread's main loop to put a task in the scheduled hash onto the run hash.` runTaskNow(self, name) `Allow a registered task to be immediately executed. Returns True if the task is either currently running or was started, or False if the task could not be found in the list of currently registered tasks.` running(self, name, default=None) `Return running task with given name. Returns a task with the given name from the "running" list, if it is present there.` runningTasks(self) scheduleTask(self, handle) `Schedule a task. This method takes a task that needs to be scheduled and adds it to the scheduler. All scheduling additions or changes are handled by this method. This is the only Scheduler method that can notify the run() method that it may need to wake up early to handle a newly registered task.` scheduled(self, name, default=None) `Return a task from the scheduled list.` scheduledTasks(self) setNextTime(self, time) setOnDemand(self, handle) `Add the given task to the onDemand list.` setRunning(self, handle) `Add a task to the running dictionary. Used internally only.` setScheduled(self, handle) `Add the given task to the scheduled list.` start(self) `Start the scheduler's activity.` stop(self) `Terminate the scheduler and its associated tasks.` stopAllTasks(self) `Terminate all running tasks.` stopTask(self, name) `Put an immediate halt to a running background task. Returns True if the task was either not running, or was running and was told to stop.` unregisterTask(self, name) `Unregisters the named task. After that it can be rescheduled with different parameters, or simply removed.` wait(self, seconds=None) `Our own version of wait(). When called, it waits for the specified number of seconds, or until it is notified that it needs to wake up, through the notify event.` Methods inherited from threading.Thread: __repr__(self) getName(self) isAlive(self) isDaemon(self) join(self, timeout=None) setDaemon(self, daemonic) setName(self, name) Data and other attributes inherited from threading._Verbose: __dict__ = <dictproxy object> `dictionary for instance variables (if defined)` __weakref__ = <attribute '__weakref__' of '_Verbose' objects> `list of weak references to the object (if defined)`

Functions
`` |  | sleep(...) `sleep(seconds) Delay execution for a given number of seconds. The argument may be a floating point number for subsecond precision.` time(...) `time() -> floating point number Return the current time in seconds since the Epoch. Fractions of a second may be present if the system clock provides them.`