A modern architecturereview–usingcodereviewtools-ver-3.5

A Modern Architecture Review
Using Code Review Tools

@AdamCogan | #vsalm #tee12 #dev324

Delivering Awesome Web Applications

Agenda
• #1 The 1st things to look out for
• Processes
• Does it work?
• Documentation

• #2 High Level tools
• Architecture
• Code Analysis
• Code Metrics

• #3 Manual Checking
• SOLID Design Principles
• Code Review tools

V9.5

About Adam
 Chief Architect at SSW
 Developing custom solutions for
businesses across a range of
industries such as Government,
banking, insurance
 Microsoft Gold Partner
 Microsoft Regional Director
 VSTS MVP
 @AdamCogan

The first things to look out for

Do you evaluate the processes?
 Often times this is the source of problems
 Are devs getting bogged down in the UI?
 Do you have a Scrum Master?
 Do you have continuous integration?
 Do you have continuous deployment?
 Do you have a Schema Master?
 Do you have a TFS Master?

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/DoYouHaveTheD
esignersFixingUpTheUI.aspx

Are they on the latest version?
 …of VS

 …of TFS

 Alternatively for a „Gold Star‟ …
 Resharper, add-ins, extensions

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/CanYouGetLatestAndCompile.aspx

Can you „Get latest‟ and compile? #L1
 It's amazing how often you can't simply do a "Get Latest" and
compile

 Add _Instructions_Compile.docx

 Then run unit tests…


Can you get latest and compile? #L1
 See the Integration.Test project fail

 Add _Instructions_Compile.docx


Can you get latest and compile? #L2
 Creation of the
database via
scripts
(incremental)
Tip: use OSQL,
SQLCMD or SSW
SQL Deploy
 and re-run the
tests. They will
now pass.

Do you want a „Gold Star‟ ? #L3
 Streamline setup of a new development environment
 Problems to check for:
 Windows 8 not supported
 Many things to build
 Lots of dependencies
 Recommendation: All manual work station setup steps
should be scripted with PowerShell
 Recommendation: A get + compile should work within 1
minute, and work without a dev being on the domain (to
support external consultants)

PS C:CodeNorthwind> .Setup-Environment.ps1

Problem: Azure environment variable run state directory is not configured
(_CSRUN_STATE_DIRECTORY).

Problem: Azure Storage Service is not running. Launch the development fabric
by starting the solution.

WARNING: Abandoning remainder of script due to critical failures.

To try and automatically resolve the problems found, re-run the script with a -Fix
flag.

Figure: You see the problems in the devs environment
Note Prefix e.g. _01Setup-Environment.ps1

PS C:CodeNorthwind> .Setup-Environment.ps1 -fix

Problem: Azure environment variable run state directory is not configured
(_CSRUN_STATE_DIRECTORY).
Fixed: _CSRUN_STATE_DIRECTORY user variable set

WARNING: No automated fix available for 'Azure Storage Service is running'


Figure: The script tries to automatically fix the problems

PS C:CodeNorthwind> .Setup-Environment.ps1 -fix

WARNING: No automated fix available for 'Azure Storage Service is running'


Figure: Note on 2nd run only 1 script remains – see there is less to fix

Can you „Check In‟ and Deploy #L1
 Add _Instructions_Deploy.docx

 Alternatively for a „Star‟ …

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/Default.aspx

 Use PowerShell scripts as your documentation
 build.ps1
 deploy_dev.ps1
 deploy_test.ps1
 deploy_prod.ps1
 Alternatively for a „Gold Star‟ … TFSBuild + Portal

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/Default.aspx

TFSBuild + Portal

The compile problem….

A team issue?

Does it matter?

No?


Methods of compiling [Pain]
?


Tip: Should you compile? [Pain]
 Look at the page…

 Alt+Tab to Visual studio

 Modify file

 Save

 F5

 Wait 15 sec…

 Change the url (sometimes a crazy error)…

 Hit F5… Wait 5 sec

 Review change… (report)


Tip: Should you compile? [Pain]


Do you review the Solution and
Project names?
 The name of your solution and the names of the project in your
solution should be consistent

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/DoYouReviewThe
SolutionName.aspx

Do you review the documentation?
 Old School:
 Heavy, long documents
 Sequence Diagrams
 UML

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/DoYouReviewThe
Documentation.aspx

Suggestions for doco
e.g. Enterprise Architect
 Use Red for unimplemented stuff

 Use the DateTime shape
To see the last time the diagram was modified and by whom

 Mark items as „TODO: Adam‟.
For items still pending

Do you review the documentation
 New School:
 4 docs
• Business.docx
• _Instructions_Compile.docx
• _Instructions_Deploy.docx
• Technologies.docx
 Unit Tests (low level)
 Code and Work Items (low level  PBI)

Agenda
• Processes
• Does it work?
• Documentation

• Architecture
• Code Analysis
• Code Metrics

Do you look at the architecture?
 2 Choices:
 VS Dependency Graph or … ?
• Ultimate Edition + Take screenshots
 nDepend ?
• 3rd Party Tool for a few hundred $ + Take screenshots
• Bad - Attach… Detach…. Noisy UI
• Bad - Complicated
• Good - No need for VS Ultimate
• Bonus: See problems in the „Queries + Rules Explorer‟
• Awesome - Customizable

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/DoYouLookAtThe
Architecture.aspx

My Dream – it automatically does this

Ndepend Relationships 101
Dependancy Graphs Intro
• Drill into a major relationship
• Edge Thickness: # Types
• [Major] Select Types | That are using me directly or indirectly

Doco:
Relationship | Export to HTML
• Relationship | Export to Graph
• Relationship | Generate a code rule that warns if this dependency
exists
• Relationship | View internal Dependency cycles on graph

Something for the wall
• http://www.ndepend.com/Res/DiagramBoxAndArrowGraphBig.jpg

Ndepend Relationship 201
• See bidirectional relationships
• Potentially not healthy
• Relationship | Open this dependency on Matrix

About Erosion
• Much more green… then the blue is erosion
• Solution? Adaptive Design… moving towards the way the software has
evolved
• Fix by remove the hard dependency in the wrong direction. Add some
Inversion of Control (aka interfaces) in the middle

Ndepend Relationships 301
Continuing….the matrix

Before fixing understand the scope

Right click | Build a graph representing one of the shortest paths

Ndepend 401
The rules

Q: Which ones do you care about?

(use the Metrics view for a picture)

Great Overview tool and learning tool
Not for day-to-day use as a code analysis tool.
Note: Don‟t be distracted by a colour problem 

The Goal for your Code Analysis?

The Goal for your Code Analysis?

Encourage team members to check in their
code regularly
with no Code Analysis warnings, and
Code Metrics in green.

Eg.

Lets have a look at my Norwegian Ninja

Do you use the best Code Analysis
tools?

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/DoYouDoCodeAn
alysis.aspx

tools?
 Level 1 – ReSharper – All Rules

 Level 2 - VS Code Analysis (FXCop) – Default Settings

 Level 3 - VS Code Analysis (FXCop) – All Rules

 Level 4 – StyleCop – All Rules

 Level 5 – SSW Code Auditor – All Rules

?

alysis.aspx

tools?
 Level 1 – ReSharper – campsite scout rule
 Level 2 - VS Code Analysis (FXCop) – Default Settings
 Level 3 - VS Code Analysis (FXCop) – Custom
 Level 4 – StyleCop
 Level 4 – StyleCop - Custom
 Level 5 – SSW Code Auditor
 Level 5 – SSW Code Auditor - Custom
TIP: Have a document with rules that you turn off and the reason

alysis.aspx

Code Analysis

 Run

 Options to make a Custom set (Hard UI)

Code Analysis – Suppress #1
Add in „Suppression File‟ or in code?

 ?

Code Analysis – Suppress #2

Add in „Suppression File‟ or in code?
 Rule No Good – removed from Rule Set

 Rule N/A in this case – in „Suppression File‟

 Rule is Valid – in this case I am overriding it

Code Analysis – Create work item #1
Add as Bug, PBI or Task...

?

Code Analysis – Create work item #2
 Option 1: German (Neno Loje)
Select 30 in a PBI

Leave as warning

 Option 2: Boy Scout
Easy ones (all into 1 PBI) eg. Alt+Enter on Resharper
Hard ones (1 per PBI)

Do you check the code coverage?
 See if there are unit tests

 See if they are any good (~ 80% coverage)

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/DoYouLookForCodeCoverage.aspx

Report time?
 If you are doing a report, gather some more reports…

E.g. Code Metrics, Code Coverage, Code Clones

 But lets assume we are continuing to „Probe‟… So from:
 SRP
 …
 …
 Naming Conventions

Our solution is clean now. What next?

Agenda
• Processes
• Does it work?
• Documentation

• Architecture
• Code Analysis
• Code Metrics

• SOLID Design
Principles

Do you run Code Metrics to find
dodgy code?
 Use the “Hot Spots” feature to quickly identify smelly code

 It measures:
 Maintainability Index
 Cyclomatic Complexity
 Depth of Inheritance
 Class Coupling
 Lines of Code

Manual Checking:
Getting our hands dirty

Manual Review
 After using the automated high level tools it‟s time to actually
jump into the code

 Look for code that doesn‟t follow SOLID principles… and then
design patterns

 Speak to the devs

SOLID Principles
 Single Responsibility Principle

 Open Close Principle

 Liskov Substitution Principle

 Interface Segregation Principle

 Dependency Inversion Principle

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/DoYouKnowCom
monDesignPrinciples.aspx

Single Responsibility Principle
 A class should have one and only one responsibility

public class Address {
// Standard Address Properties
public Image GetGoogleMaps() {}
public decimal GetDistance(Address destination) {}
public bool ValidateAddress() {}
}

 The Address class has too many responsibilities
 Showing an image of the address (tied to UI)
 Calculations based on the address
 Validation of the address
 Another UI may use BingMaps instead of Google Maps

 Some, if not all of these functions should be moved to other
classes like MapHelper and AddressHelper

public class AddressHelper {
public decimal GetDistance(Address start, Address destination) {}
public bool ValidateAddress(Address address) {}
}
public class GoogleMapProvider : IMapProvider {
public Image GetMap(Address start) {}
}

public class BingMapProvider : IMapProvider {
public Image GetMap(Address start) {}
}

Open Closed Principle
 Open for extension, but closed for modification

 Use Abstract base classes that specify some base functionality

 E.g. In .NET WebRequest allows you to connect servers via
web protocols
 HttpWebRequest
 FtpWebRequest
 FileWebRequest

Liskov‟s Substitution Principle
 Subtypes must be substitutable for their base types

public abstract class Duck {
public abstract void Quack();
}

Liskov‟s Substitution Principle
public class PekinDuck : Duck {
public void Quack() {}
}

public class BatteryPoweredDuck : Duck{
public BatteryPoweredDuck(Battery energizer) {}
public void Quack() {}
}
Can‟t swap PekinDuck with BatteryPoweredDuck because
you need pass it some batteries first

Another example
public class Rectangle { public class Square : Rectangle {
protected int _width; public override void SetWidth(int width) {
protected int _height; _width = width;
_height = width;
public int Width { get { return _width; }
}
public int Height { get { return _height; } public override void SetHeight(int height)
public void SetWidth(int width) { {
_width = width; _width = height;
} _height = height;
}
public void SetHeight(int height) {
}
_height = height;
}
}

Another Example (cont…)
 If we try to use these classes

var shape = new Rectangle();
shape.SetWidth(2);
shape.SetHeight(5);
Console.WriteLine(String.Format(“Area = {0}”,
shape.Height * shape.Width))
// Prints 10 as expected (2 * 5 = 10)

Another Example (cont…)
 If we try the Square
var shape = new Square();
shape.SetWidth(2);
shape.SetHeight(5);
Console.WriteLine(String.Format(“Area =
{0}”, shape.Height * shape.Width))
// Prints 25 not as expected since we set
the Width = 2 and Height = 5

Another Example (cont..)
The Square violates the Liskov substitution principle as
we don‟t get expected behaviour as setting the width will
also modify the height and vice versa

Interface Segregation Principle
 Don‟t create interfaces with lots of methods that don‟t
necessarily get used in their implementations
public interface IBird { public class MockingBird : IBird
public void Chirp(); {
public void Flap(); public void Chirp() {}
public void Fly(); public void Flap() {}
public void Eat(); public void Fly() {}
} public void Eat() {}
}

public class Emu : IBird {
public void Chirp() {}
public void Flap() {}
public void Fly() {}
public void Eat() {
throw new NotImplementedException();
}
}


public interface IBird {
public void Chirp();
public void Flap();
public void Eat();
}

public interface IFlyingBird : IBird {
public void Fly();
}

public class Emu : IBird {
public void Chirp() {}
public void Flap() {}
public void Fly() {}
}

Dependency Inversion Principle
Depend on abstractions, not on implementations. Anything
required to create a valid instance of an object, should have those
dependencies passed in as arguments to the constructor

 Higher level classes to depend on abstractions of lower level
classes (swappable)
public class Employee {
public Employee() {
FavCoffee = new Cappuccino();
Skills = new List<Skills> {
new MSAccessSkill(),
new SharePointSkill(),
new DotNetNukeSkill()
}
}
}

public class Employee {
public Employee(IDrinkable iamthirsty, IEnumerable<Skills> skills) {}
}


var MarkLiu = new Employee( var EricPhan = new Employee(
CoffeeFactory.Get(“Skim Cappuccino”), CoffeeFactory.Get(“Latte”),
new List<Skills> { new List<Skills> {
new MSAccessSkill(), new BusinessIntelligenceSkill(),
new SharePointSkill(), new MVC4Skill(),
new DotNetNukeSkill() new DotNetSkill()
}); });

Do you know the common Design
Patterns?
 ?

“Communicate massive amount of data in a few words”

 Adam Cogan

“Accepted solutions to well known problems”

 Ben Day

monDesignPatterns.aspx

Do you know the common Design
Patterns?
 Inversion of Control  Abstract factory  Iterator

 Dependency Injection  Adapter  Visitor

 Factory  Bridge  State

 Singleton  Mediator  Composite

 Repository  Proxy  Facade

 Unit of Work  Flyweight  Observer

 MVC  Chain of responsibility  Decorator

 MVP  Command  Null object

 MVVM  Memento  Interpreter

monDesignPatterns.aspx

Abstractness vs Instability Diagram
 Shows the assemblies that are painful to
maintain
i.e concrete and stable, and
which assemblies are potentially useless
i.e abstract and instable

 Abstract: The assembly contains many abstract
types (i.e interfaces and abstract classes) and
few concrete types

 Stable: The assembly is considered stable if its
types are used by a lot of types of tier
assemblies. In this condition stable means painful
to modify.

Do you start reading code?
Comments
 Q: Good or Bad?

 Comments are a smell

 Includes comments that explain the intent (the why rather than
the what)

Do you start reading code?
 Is clear and easy to read

 Has consistent and meaningful names for everything

 Has no duplicate or redundant code

 Has consistent styles and formatting

 Explains "why" when you read down, and "how" when you
read left to right

http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterArchitectureandCodeReview/Pages/DoYouStartReadi
ngCode.aspx

Do you know Code Reviews after
check in are bad?
 If you are aiming to get the to nirvana of Continuous
Deployment, then you cant *rely* on code reviews after the
fact.

 Code Reviews have different status:
* Important
* Nice to have

The Scenario
 Mark is migrating from DotNetNuke to MVC

 He‟s unsure of his code because he doesn‟t know Razor

 Add some code with a comment „this could be done better‟

 Checks in anyway

Use the Code Review tools in TFS
2012
 TFS 2012 has built in Code Review tools

 Hooks into the check-in/shelving process

 This allows code to be manually reviewed before checking in

Check out the
changeset
Related work
items

Modified files

Mark any flagged
code as completed

Mark the Code Review as Complete

Code Review Summary
 Today: Developer does some work and wants to get it
checked before committing to source control

 Suggestion to MS: Add a new scenario
 No touching of code
 Architect „Adds comments‟ during code review
 Automatically adds the developers who originally worked on that
section (instead of manually using annotate)
 Creates “Code Review” work items

http://www.ssw.com.au/ssw/Standards/BetterSoftwareSuggestions/TeamFoundationServer.aspx

Resources
 Thanks: Eric Phan and Adam Stephensen

 Thanks: Marcel De Vries and Terje Sandstrom

 Google: ssw tv architecture code reviews

 http://rules.ssw.com.au/SoftwareDevelopment/RulestobetterAr
chitectureandCodeReview/

Summary
• Processes
• Does it work?
• Documentation
• Architecture
• Code Analysis
• Code Metrics

Evaluations + 2 things
 Include best tip or tool you heard. Plus your tip to me.

 @adamcogan
or
AdamCogan@ssw.com.au

 Come and visit us (+ Sydney .NET User Group)

 Come and visit Damian Brady, Steven Nagy (+ Brisbane .NET User Group)

Thank You!
Sydney | Melbourne | Brisbane | Adelaide

info@ssw.com.au

www.ssw.com.au

Delivering Awesome Web Applications

Questions?
Take a business card.

Refactoring
 Level 1: Minimum

 Level 2: Custom

 Note: All disabled ones to be documented
eg. http://www.benday.com/2010/03/15/article-static-methods-
are-a-code-smell/

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