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Architecture: Bento vs Burrito
Keishin Yokomaku @ Drivemode, Inc.
umeda.apk #1
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@KeithYokoma
• Keishin Yokomaku at Drivemode, Inc.
• Work
• Android apps
• Android Training and its publication
• Like
• Bicycle, Photography, Tumblr and Motorsport
• hoge
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About “Drivemode”
• “No Look” driving interface running on the phone.
• Simplify the way drivers user their phone
while driving.
• Allows them to focus on the road.
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About “Drivemode”
• Available features
• Contacts: Call and Message
• Navigation control
• Music playback control and playlist access
• Application launcher
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About “Drivemode”
• Overlays on any applications
• You can see navigation while playback controlling
• Help users understanding what they are doing
• Sound & voice feedback
• Big UI and touch feedback effect
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Available on Play Store!
http://bit.ly/1LYdxAg
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Application Requirements
Login and save user profile
Choose favorite contacts
Choose favorite navigation app
Control music playback
ʜ
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Application Requirements
Login and save user profile
Choose favorite contacts
Choose favorite navigation app
Control music playback
Internet Access
Database
Preferences
IPC
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Application Requirements
Internet Access
Database
Preferences
IPC
Protocol, network state, cache strategy, etc…
Content Uri, projection, selection, order, etc…
Data type, preference name, etc…
AIDL, media session and controller, etc…
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–Johnny Appleseed
“͜͜ʹҾ༻Λೖྗ͍ͯͩ͘͠͞ɻ”
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“Who is responsible for each features/requirements?”
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Application Components
Activity
Fragment
View
BroadcastReceiver
Service
ContentProvider
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Activity responsibility
Activity
MainActivity
UI Event handler
System service calls
AsyncTaskLoader
UI State management
ʜ
\
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Activity responsibility
Activity
MainActivity
UI Event handler
System service calls
AsyncTaskLoader
UI State management
ʜ
\
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No content
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• Everything is mixed into one activity.
• You cannot get rid of cilantro even if you hate it.
Burrito architecture
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No content
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Better Architecture
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Practices
MVC
MVP
MVVM
…
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Practices
ModelViewController
ModelViewPresenter
ModelViewViewModel
…
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“Which one will fit my project?”
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Let’s simplify it
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Keywords
• Single Responsibility Principle
• “A class should have only one reason to change.”
• Clean Architecture
• “Independent of Frameworks”, “Testable”, “Independent of UI”,
“Independent of Database”, “Independend of any external agency”.
• For this time, let’s talk about “Model” layer
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–@rallat
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Presentation Bento
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Presentation Model
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The so-called “Model”
• Model has “Business Logic” and “Data”.
• One model contains various kind of “Business Logic” and “Data”.
• How to retrieve and store data(REST API, Database Cache, etc…)
• How to convert serialized data to value object(entity)
• How to order collection data
• etc…
• Model may have blocking procedure(Network I/O, File I/O, etc…).
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–Someone
“Model can be Burrito”
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Model as a Bento
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Model as a Bento
REST API Client
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Model as a Bento
Cache Database
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Model as a Bento
Preferences
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Model as a Bento
Model Interface
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Model as a Bento
Main Thread
Worker Thread
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Model as a Bento
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Model as a Bento
• Build classes for each purpose(SRP)
• REST Client class
• Cache Database manager class
• Preferences class
• Combine all asynchronous tasks in Model Interface class using Rx/Promise
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Model as a Bento
// REST Client interface
public interface FooBarRestGateway {
@GET(“foo/bar”)
Observable> requestFooBar();
}
// Database Manager interface
public interface FooBarDatabaseClient {
Observable> fetchFooBar();
}
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Model as a Bento
// REST Client interface
public interface FooBarRestGateway {
@GET(“foo/bar”)
Observable> requestFooBar();
}
// Database Manager interface
public interface FooBarDatabaseClient {
Observable> fetchFooBar();
}
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Model as a Bento
// Model Interface class
public class FooBarRepository {
private final FooBarRestGateway mGateway;
private final FooBarDatabaseClient mDbClient;
public Observable> fooBarList() {
return Observable.>concat(
mDbClient.fetchFooBar(),
mGateway.requestFooBar()
).first(list -> list != null)
.subscribeOn(Schedulers.io());
}
}
https://speakerdeck.com/hkurokawa/5-rxjava-tips-you-might-not-know
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Model as a Bento
// Model Interface class
public class FooBarRepository {
private final FooBarRestGateway mGateway;
private final FooBarDatabaseClient mDbClient;
public Observable> fooBarList() {
return Observable.>concat(
mDbClient.fetchFooBar(),
mGateway.requestFooBar()
).first(list -> list != null)
.subscribeOn(Schedulers.io());
}
}
https://speakerdeck.com/hkurokawa/5-rxjava-tips-you-might-not-know
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Model as a Bento
// Model Interface class
public class FooBarRepository {
private final FooBarRestGateway mGateway;
private final FooBarDatabaseClient mDbClient;
public Observable> fooBarList() {
return Observable.>concat(
mDbClient.fetchFooBar(),
mGateway.requestFooBar()
).first(list -> list != null)
.subscribeOn(Schedulers.io());
}
}
https://speakerdeck.com/hkurokawa/5-rxjava-tips-you-might-not-know
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Bento and Clean Architecture
Clean Architecture: Data Layer using Repository Pattern
Bento
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Don’t touch Bento directly
Activity
Activity
Activity
I want a healthy one!
I want no-smelling one!
I want one with !
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ʢPhoto by SAKURAKO - Do not get mad !/ MJ/TR (´ŋТŋ)ʣ
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Domain layer
Activity
Activity
Activity
Domain
Domain
Domain
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Domain layer
Activity
Activity
Activity
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Domain layer
Activity
Activity
Activity
Filter out smelling foods
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Domain layer
Activity
Activity
Activity
Filter out unhealthy foods
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Domain layer
Activity
Activity
Activity
+
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Domain layer
Clean Architecture: 3 layer architecture
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Domain layer
Activity
Activity
Activity
Clean Architecture: 3 layer architecture
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Wrap up
• Clean Architecture and Bento
• Class separation according to Single Responsibility Principle
• Combine several tasks using Rx/Promise
• Data layer bento is Singleton
• Modify data in Domain layer
• Don’t Burrito, do Bento
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Architecture: Bento vs Burrito
Thank you for listening!
Keishin Yokomaku @ Drivemode, Inc.
umeda.apk #1