I am encountering an issue with a logging schema and an app I am developing in app designer. The app is designed to provide logged feedback to a text area on the UI, such that a User can determine how a computation is going. This is implemented using a Logger/Appender scheme. I have an Appender class that is instantiated in the app and then has a 'display function' property which holds an anonymous function to log to. Such that in the app the appender is instantiated and configured via
app.appender = Utility.UIFigureAppender;
app.appender.DisplayFunction = @(msg) app.addToDisplay([],msg);
the add to display function formats the message, handles input checking and then sets
app.loggingInformation.Value{end+1} = messageString
The logger itself utilises dataqueues such that a node can send logged data to the head. Further, each appender is distributed across each node using dataqueue as shown below. I think this is where my issue resides. Code snippets follow:
function determineDataQueueEvent(evt)
switch evt.source
case 'log'
Logger.log(evt.data)
case 'addAppender'
Log.Logger.distributeAppender(evt.data)
[...
end
end
function generateLogEvent(level,msgIdent,msgString,varargin)
data = Log.LoggingEvent(level,msgIdent,msgString,varargin)
evt.data = data;
evt.source = 'log'
Log.Logger.queue(evt);
end
function queue(evt)
obj = Log.Logger.getInstance;
send(obj.loggingQueue,evt)
end
the data queue in the logger class is called whenever a log message is made or an appender is added, the determineDataQueueEvent function determines how the head node handles this. That is to say my dataqueue is set up as
afterEach(obj.loggingQueue,@Logger.determineDataQueueEvent)
In the case of the Utility.UIFigureAppender this reads as
[...
this.DisplayFunction(message);
[...
From debugging, I believe my issue is that in using the dataqueue and that in distributing the Utility.UIFigureAppender the handle to the app in the anonymous function now points to a new app. I have confirmed that the 'addToDisplay' call is not carried out in the app which spawns the log message based on some assignin('base',...) compares.
Is there anyway to keep the same app handle in the anonymous function when the appender is distributed across the nodes?
Other thoughts/comments welcomed. Sadly I cannot attach the full files as the code resides on an airgapped pc (and so code may contain typos too!)
Thanks for any help
