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Android Clean Architecture

Implementing the UnBookmark Project use case (Domain layer 8)

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In Clean Architecture, the Domain layer defines Use Cases which define operations which can be performed in our application. In this lesson, we’ll be implementing the UnBookmark Project Use Cases class for our application so that we can remove a project from our list of bookmarked projects within our external data source through our domain layer.

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Hey, I'm really enjoying this tutorial so far, but I'm a bit confused because you create a second Params class that is identical to the first that was defined as an inner class inside the BookmarkProject. How is this code duplication fitting in with clean architecture?

I have the same question. Joe, could you explain to us?

Great question :) So yea there is code duplication here, but this means that the bookmark and unbookmark use cases are kept independent from one another. As you say, the duplication is only for the Params classes, which every class needs to have anyway.

If you find that this is an issue for your project, you could have a base use case class called BookmarkProject and then have two use cases (SetProjectAsBookmarked, SetProjectAsUnBookmarked) which both extend this base class. That would allow you to just have the base class provide the params class. Another way would be to have an external class for the Params class, that way you move the Params out of the use case (for example, you could have an IdParams class).

If you do do either of these I would avoid having every single use case based off of this base class or generic Param class, as in that case you'd have many classes coupled to another class. And if you wanted to add another parameter to the Params class in either case, then you end up enforcing that in places where it isn't needed.

Hi Joe, I love how you structured your project, but I am not familiar with Kotlin, is there any book you can recommend that provides the same level of details on this clean architecture approach?I have read Uncle Bob's clean code and architecture but feels like I'm missing something, thank you

>
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Lessons in Android Clean Architecture

Introduction to Clean Architecture
03:40
Joe Birch
GDE
Android and Clean Architecture
03:51
Joe Birch
GDE
Setting up a Multi-Module project
02:24
Joe Birch
GDE
Setting up the Domain layer module
02:24
Joe Birch
GDE
Creating the abstraction for our RxJava Observation Thread
02:02
Joe Birch
GDE
Setting up the Business Data for the Domain Layer
01:47
Joe Birch
GDE
Setting up the data access interface for the Domain Layer
01:49
Joe Birch
GDE
Setting up the Domain Layer Interactor classes
Pro
03:28
Joe Birch
GDE
Implementing the Get Projects use case
Pro
01:49
Joe Birch
GDE
Implementing the get Bookmarked Projects use case
Pro
01:33
Joe Birch
GDE
Implementing the Bookmark Project use case
Pro
01:57
Joe Birch
GDE
Implementing the UnBookmark Project use case (Domain layer 8)
Pro
02:03
Joe Birch
GDE
Testing the Get Projects use case
Pro
02:41
Joe Birch
GDE
Testing the Get Bookmarked Projects use case
Pro
02:04
Joe Birch
GDE
Testing the Bookmark Project use case
Pro
02:10
Joe Birch
GDE
Testing the UnBookmark Project use case
Pro
02:06
Joe Birch
GDE
Setting up the data module
Pro
02:17
Joe Birch
GDE
Creating the data models for the data layer
Pro
02:48
Joe Birch
GDE
Creating the external source interfaces for our data layer
Pro
02:24
Joe Birch
GDE
Creating the data layer store interface
Pro
01:19
Joe Birch
GDE
Creating the data layer cache data store
Pro
01:21
Joe Birch
GDE
Creating the data layer remote data store
Pro
01:39
Joe Birch
GDE
Creating the data store factory class
Pro
01:24
Joe Birch
GDE
Creating the central access point for the data layer
Pro
03:00
Joe Birch
GDE
Setting up the tests for the Data Layer
Pro
00:46
Joe Birch
GDE
Testing the data store factory class
Pro
01:39
Joe Birch
GDE
Testing the project entity mapper
Pro
01:18
Joe Birch
GDE
Testing the projects data repository
Pro
06:02
Joe Birch
GDE
Testing the projects cache data store
Pro
06:30
Joe Birch
GDE
Testing the projects remote data store
Pro
02:17
Joe Birch
GDE
Setting up the remote module
Pro
02:21
Joe Birch
GDE
Creating the data models for the remote layer
Pro
02:06
Joe Birch
GDE
Creating the Retrofit Service for the remote data source
Pro
01:58
Joe Birch
GDE
Creating the Retrofit Service Factory for the remote service interface
Pro
02:52
Joe Birch
GDE
Creating the data model mapper for the Remote Layer
Pro
01:59
Joe Birch
GDE
Creating the Remote Source implementation
Pro
01:55
Joe Birch
GDE
Setting up the Remote layer for testing
Pro
02:13
Joe Birch
GDE
Testing the remote model mapper class
Pro
01:39
Joe Birch
GDE
Testing the remote source implementation
Pro
05:09
Joe Birch
GDE
Setting up the Cache module
Pro
02:45
Joe Birch
GDE
Setting up the Cache layer data models
Pro
02:02
Joe Birch
GDE
Creating the database for the cache layer
Pro
01:34
Joe Birch
GDE
Creating the cached project Data Access Object
Pro
02:42
Joe Birch
GDE
Creating the Configuration Data Access Object
Pro
02:07
Joe Birch
GDE
Creating the cache model mapper
Pro
02:06
Joe Birch
GDE
Creating the Projects Cache data source Implementation
Pro
03:57
Joe Birch
GDE
Setting up the tests for our cache layer
Pro
01:17
Joe Birch
GDE
Testing the cached project model mapper
Pro
01:44
Joe Birch
GDE
Testing the Cached project DAO
Pro
04:33
Joe Birch
GDE
Testing the Configuration DAO
Pro
02:05
Joe Birch
GDE
Testing the projects cache implementation
Pro
05:48
Joe Birch
GDE
Setting up the presentation module
Pro
02:05
Joe Birch
GDE
Creating the data models for the presentation layer
Pro
01:13
Joe Birch
GDE
Creating the data model mapper for the presentation layer
Pro
01:26
Joe Birch
GDE
Creating the presentation state model
Pro
01:39
Joe Birch
GDE
Creating the browse projects view model
Pro
04:25
Joe Birch
GDE
Creating the bookmarked projects view model
Pro
03:05
Joe Birch
GDE
Setting up the presentation module tests
Pro
02:09
Joe Birch
GDE
Testing the view model mapper
Pro
01:17
Joe Birch
GDE
Testing our Browse Projects View Model implementation
Pro
04:36
Joe Birch
GDE
Testing our Browse Bookmarked Projects View Model implementation
Pro
04:34
Joe Birch
GDE
Setting up the UI module
Pro
02:22
Joe Birch
GDE
Creating the Post Execution Thread Implementation
Pro
01:26
Joe Birch
GDE
Setting up the application class
Pro
00:50
Joe Birch
GDE
Setting up the Dependency Injection for the UI module
Pro
02:46
Joe Birch
GDE
Creating the UI modules Project representation
Pro
00:50
Joe Birch
GDE
Creating the the Project model mapper for the UI module
Pro
01:24
Joe Birch
GDE
Setting up the Browse Projects Activity
Pro
01:08
Joe Birch
GDE
Configuring the DI for the project
Pro
04:37
Joe Birch
GDE
Creating the Project item view
Pro
01:51
Joe Birch
GDE
Creating the Browse Projects Adapter
Pro
03:27
Joe Birch
GDE
Creating the browse bookmarked projects adapter
Pro
03:54
Joe Birch
GDE
Creating the browse bookmarked projects activity
Pro
03:18
Joe Birch
GDE
Tying together the browse projects and bookmarked projects activity
Pro
02:30
Joe Birch
GDE
Setting up Unit Tests for the UI module
Pro
00:54
Joe Birch
GDE
Test the project model mapper
Pro
01:10
Joe Birch
GDE
Configuring the Dependency Injection for our User Interface tests
Pro
06:10
Joe Birch
GDE
Writing Espresso tests for the Browse Projects Activity
Pro
03:15
Joe Birch
GDE
Writing Espresso tests for the Bookmarked Projects Activity
Pro
02:34
Joe Birch
GDE
Simplifying the work we have done
Pro
05:14
Joe Birch
GDE