SFScon 22 - Eduardo Guerra - Sustaining the Software Architecture.pdf

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Agile projects embrace changes and apply techniques to make these changes easy to be done. But not for the architecture! This talk presents techniques to manage and sustain the architecture, enabling it to evolve during the project and support innovation by adopting new technologies. A concrete example will be shown to illustrate the approach.

Software

Software architecture
Non-functional
requirements

It will affect data
storage and internal
architecture.
I want this 20-year client
record to be generated
in 5 seconds.

I want this 20-year client
record to be generated
in 5 seconds.
Changes completely
the solution, saving
a lot of work!

Can we trust the
non-functional
requirements?

NFRs not identified
at the beginning of
the project.
NFRs defined in
response to problems
found on the project.
NFRs are outdated
or with unknown
state to the system
in production.
Significant changes in
NFRs, and several of
them after analyzing
system in production.

Upfront
Software
Architecture
Change in
Non-functional
Requirement
Result to
Your Project

But Agile is
supposed to help
with changing
requirements,
right?

While automated
testing and refactoring
can make the code
ready for functional
changes…

… changes in non-functional
requirements might demand dangerous
modifications in architecture.

Flexible architecture
solutions might be
painful if not used in
the right context.

You cannot be flexible in every
aspect of the architecture!

How can software
architecture be
designed in a way that
it can be sustained
facing uncertainty?

Each uncertain requirement or architectural
decision should be considered a hypothesis.

The application needs
to answer 1000
simultaneous requests.
This relational database
will be enough to store
the system data.
Uncertain Requirement
Uncertain Decision
Hypothesis

Uncertain
Requirement
Uncertain
Decision
Future vision
and features
Search for
innovation
Unproven
solutions
Limitations
and problems

Impact Risk
The severity of the
consequences if the
hypothesis is not true
The possibility of
the hypothesis not
being true
Hypothesis evaluation

Now you need a plan about how to
handle each hypothesis!

Architectural Spike
A research or investigation activity
to gather more information about
a technology or solution.

Modularity
Isolate a given
concern in a way
that is easy to
replace or change.

Software Analytics
Measurement that
monitors characteristics
that can aid in decision-
making.

Flexibility
Implement a more flexible solution
that allows the application to adapt
more easily.

Architectural Trigger
A condition that needs
to be met to start a
given action.

Experiments Studies and A/B tests
that gather data to help
in decision-making.

Tracer Bullet
A system feature to explore and
demonstrate how new
components or elements fit in
the architecture.

Solution Candidate
An attempt to validate the hypothesis
by implementing a specific solution.

Do nothing
can be a valid
choice…
… if you are
aware of the
consequences

The plans should be
prioritized and executed
iteratively.
The hypothesis risk and
impact should be updated
and re-planed.

No
Silver Bullet
The goal is to
provide a
systematic way
to manage the
software
architecture
evolution

“If you think good
architecture is
expensive, try bad
architecture.”
Brian Foote and
Joseph Yoder

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