IEEE Consumer Electronics Magazine - March/April 2020 - 61

has two buttons and one label
that shows the number of
times the first button is clicked.
The second button shows the
second screen when clicked
and this second screen has one
button to go back to the first
screen. This app must track
the following events with GA
and AF.
1)
2)
3)
4)
5)

First screen is loaded.
First button is clicked.
Second button is clicked.
Second screen is loaded.
Button in the second
screen is clicked.

Figure 2. Standard versus AOPþMANTRA implementations.

Then, we defined two main variables: a global
one for all the events that contain a string, and a
dynamic one to be sent when the first button is
clicked specifying the number of times it has
been clicked.
For testing purposes, we have designed an app
life cycle where the tracking needs change. Thus,
following are the changes.
1. Change the global variable sent with all the
events.
2. Stop sending the dynamic value when the first
button in the first screen is clicked.
3. Stop tracking with AF.
4. Start sending the dynamic value again.
5. Start tracking with AF again.
A developer implemented
two different versions of the
app, the first one using the
standard implementation, and
the second one using AOP and
MANTRA library. A comparison
between both methods is
shown in Figure 2. The development of the app was divided
into a list of tasks and the developer was timed while doing the
tasks and implementing the
changes. The time invested in
tasks that needed technical
skills and the tasks that did not
were also measured in order to

March/April 2020

provide a qualitative and quantitative estimation
about the related costs during the life cycle of
the app.

Results: Time and Effort Comparison
Figure 3 right shows the time spent developing and setting up the apps during its life cycle.
The Y-axis represents the time in minutes, and
the X-axis represents the life cycle, where 0 is
the initial development of the app and 1-5 are
the changes defined in the previous section. As
seen in the figure, even when the time invested
in the stage 0 is bigger in our approach, this difference is compensated while applying the
changes, due to the fact that the time spent in
them become significant smaller.
At this point, it is important to note that this
comparison is done only with the development

Figure 3. Development performance comparison: tech./no tech. skills needs (left),
time effort along life cycle (right).

61



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