Scheduler

A Squeak/Smalltalk task scheduler similar to cron.

This is a fork from the original Scheduler package provided by John Pierce. The original project remains largely unchanged except for some adjustments to match the present-day Squeak standard library. The license is MIT as with the original source code.

How to install

1. Get Squeak 4.6 or later
2. Load Metacello
3. Finally, load Scheduler with the following command:

Metacello new
  baseline: 'Scheduler';
  repository: 'github://codezeilen/scheduler/packages';
  load.

Usage

Note: The following is based on the original SqueakMap description

An easy-to-use task scheduler that can run arbitrary blocks:

• Every so often (e.g. every hour starting now)
• Daily at a given time
• Periodically starting at a given time (e.g. every other hour starting a noon)
• Per a provide schedule (e.g. using Schedule instance you can run tasks every Monday and Friday)
• A one time task at some point in the future

For ease of use tasks can be blocks passed to the scheduler (or any object that understands #value). For example:

 "Start a new task scheduler and keep it around"
 scheduler := TaskScheduler new.
 scheduler start.

"Let's save the image every hour"
scheduler
  do: [Smalltalk snapshot: true andQuit: false]
  every: 60 minutes.

"Let's run a backup at 2am every day"
scheduler
  do: ["backup code here"]
  at: '2am'

"Let's perform a bank transfer every other hour starting at 1pm"
scheduler
  do: ["swiss bank account transfer code"]
  at: '1pm'
  every: 2 hours.

"Let's do a one time email reminder"
scheduler
  doOnce: ["email reminder to go on honeymoon"]
  at: '2005-1-15T8:00'

"You can delete tasks by sending #delete to them"
(scheduler taskAt: 1) delete

"Stop the scheduler from running -- but don't delete its tasks"
scheduler stop.```

Read the provided tests for more examples.