Logging multiple or detached processes to the same log

In Using cDogger library directly I showed how to use various backends for logging. One of the benefits of this approach is that you can get visibility into tasks that have been triggered, and consolidate their logfiles. You can of course use multiple back ends for this, and you can also use the cDogger library directly. In this example, I'm going to use a spreadsheet back end. 

The steps are
  • Clear the log
  • Trigger a couple of simultaneous logging tasks
We'll pretty much use the same code as in Using cDogger library directly, except that this time we'll use threads to distinguish which task is actually logging, so start with the same libraries and code as you created for that.

Clear the log

// clear any existing data out
function sheetClear() {
  var dogger = getDogger(getSheetHandle());


Trigger a couple of tasks to run now

Trigger sheetA and sheetB. We'll use the thread parameter to distinguish who is logging what.
// do some tests using thread A
function sheetA() {
  var dogger = getDogger(getSheetHandle(),"sheeta");
// do some tests using thread B
function sheetB() {
  var dogger = getDogger(getSheetHandle(),"sheetb");

And here's a piece of the output on a sheet

You can see on the thread column the each task is logging its progress to the same sheet. DbAbstraction built in locking ensures that they can do this safely.

For more on this see Multi user apps script loggerPolymer and Database abstraction with google apps script

You want to learn Google Apps Script?

Learning Apps Script, (and transitioning from VBA) are covered comprehensively in my my book, Going Gas - from VBA to Apps script, All formats are available from O'ReillyAmazon and all good bookshops. You can also read a preview on O'Reilly

If you prefer Video style learning I also have two courses available. also published by O'Reilly.
Google Apps Script for Developers and Google Apps Script for Beginners.