[FEATURE] Example apps logging

[kangz12345]

Feature you want to implement

I realized that we didn't implement the logging of the example apps (yet only the logger app). This should be implemented for completeness (and testing).

How the feature is implemented

The other apps (numgen, poller, datacalc, dbmgr) send logging messages to the log bus.

numgen

• "Database to store is set as ${filename}." when database to store a generated number is selected.
• "Generate a random number: ${generated_number}." when the generate button clicked.
• "Save the generated number: ${generated_number}." when the number is saved.

poller

• "Polled database is set as ${filename}." when a polled database is selected.
• "Period is set as ${period_number}." when a polling period is selected.
• "Poll a number: ${polled_number}." when a number is polled.
• "Save the polled number: ${polled_number}." when the number is saved.

datacalc

• "Database A is set as ${filename}." when database A is selected.
• "Database B is set as ${filename}." when database B is selected.
• "Calculate the sum: ${result_number}." when the sum button clicked.

dbmgr

• "Database ${filename} is added." when a database is added.
• "Database ${filename} is removed." when a database is removed.

[BECATRUE]

I will implement this!

[BECATRUE]

I wrote the detailed logging format.

In real program, we need to notice which App writes a log, explicitly. In toy model, however, I think it is sufficient to notice only message not with App name because we can know who sends the log using only message.

Please leave your opinion, freely!

@kangz12345

[kangz12345]

I totally agree with it 👍