LrCatalog:withPrivateWriteAccessDo blocked by another call to write access

Hello!

I recently downloaded the trial version of lightroom 6/CC (Windows version). I started to develop my own plugin and got far enough until the moment when I started to rewrite the data in the catalog. Then I stumbled on "LrCatalog:withPrivateWriteAccessDo: cannot run action...» It has been blocked by another call to write access and no timeout parameter was provided.

I tried all sorts of things, but could not move (also read other posts on other sites). Even the minimum script below fails.

local LrApplication = import "LrApplication".

local LrDialogs = import "LrDialogs".

curCatalog = LrApplication.activeCatalog ();

Exres = curCatalog:withPrivateWriteAccessDo(function()

end)

Same thing happens for some other plugins, I downloaded and also with withWriteAccessDo.

Is the trial version limited to this, or is this a bug in the latest version?

Can you confirm that your version (purchased) Lr 6 CC or independent can run this script?

Thanks in advance!

Rasmus

Hmm, something very strange was going on I never saw elsewhere.

I use LR CC 2015.1.1 / OS X 10.10.5 and earlier, a couple of my plugins that I use every day got the same message, "LrCatalog:withPrivateWriteAccessDo: cannot run action...» It has been blocked by another call to write access and no timeout parameter was provided.    A corrected version of your test script, with a timeout of 30 seconds on the call of witheWriteAccessDo(), expired after 30 seconds. Normally, a time-out means that another task was writing the catalogue (30 seconds in this case).

I restarted LR, and now the test script and my plugins behave normally.  I'm guessing that LR was running an operation of internal accounting rude with very long access to the catalog.  To be careful, try to restart your computer and see if the error persists.

Moreover, it is a good idea to provide a setting of time-out of 30 seconds of catalogue: withWriteAccessDo ().  Without the timeout, catalog: withWriteAccessDo() of a plugin may fail.  I've never seen it fail when no other plugins are running, but it is quite common to fail when a plugin that runs in the background is enabled.  30 seconds seems to be more than enough for any plugin of good manners.

I have not updated all my older plugins have a timeout parameter.  Waiting times have been added in LR 4, I think, after Adobe realized that they had a design defect by giving access catalog plugins.  I think the original design of the SDK was to avoid delays, but that did not work.

Here is the script that I have tested with (note the use of LrTasks.startAsyncTask ()):

local Require = require 'Require'.path ("../common").reload()
local Debug = require 'Debug'.init ()
require 'strict'

local LrApplication = import 'LrApplication'
local LrTasks = import 'LrTasks'

local curCatalog = LrApplication.activeCatalog ();

LrTasks.startAsyncTask (function ()
    local exres = curCatalog:withWriteAccessDo ("with", function() end,
        {timeout = 30})
    Debug.pause (exres)
    local exres = curCatalog:withWriteAccessDo ("without", function() end)
    Debug.pause (exres)
    end)

Tags: Photoshop Lightroom

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