FeedbackTree

The API is not stable yet as we are still experimenting with the concept.

FeedbackTree is a unidirectional data flow architecture for Android which relies heavily on state mahines to perform all types of side effects, like network calls, bluetooth, UI updates as well as navigation.

Why FeedbackTree?

• Organizes the code around the business rules.
• Reactive Declarative UI
• Built-in navigation
• Logic can be easily unit tested
  • Most logic is placed in the Stepper which is pure function.
  • Side effect are isolated and testing can be done with a TestScheduler.

Core concepts

• Business rules are wrapped in a Flow. You kickstart the Flow with some input and wait for the output to be produced.
• The Flow is driven by a state machine.
• You emit Events to advance the Flow.
• Stepper is used to progress or complete a Flow based on the Events received. It is a pure function which makes unit testing very straightforward.
• Feedback loops are used separate business logic from side effects like network calls, database operations, timers, bluetooth...

Installation

The project recently migrated from jitpack to Maven Central

Add it in your root build.gradle:

allprojects {
  repositories {
    mavenCentral()
  }
}

Android Projects

Add this to your build.gradle (app)

dependencies {
  implementation "com.github.eliekarouz.feedbacktree:feedbacktree:0.13.1"
  implementation "com.github.eliekarouz.feedbacktree:core:0.13.1"
}

Proguard Rules

You need to add this to your proguard-rules.pro:

-keep class com.feedbacktree**

Kotlin Multiplatform

We are only supporting the concept of Step and Stepper in Kotlin multiplatform (iOS/Android only).
We might provide additional multiplatform support in the future. To include these concepts to a multipatform module, add this dependency to commonMain.

dependencies {
    api "com.github.eliekarouz.feedbacktree:core:0.13.1"
}

If you are targeting iOS you will also need to export the dependencies:

framework("Example") {
    export "com.github.eliekarouz.feedbacktree:core:0.13.1"
    transitiveExport = true
}

Versions

Kotlin	FeedbackTree
1.3.72	0.10.2
1.4.0	0.11
1.4.10	0.11.1
1.4.30	0.13.1

Acknowledgements

The following repos were a great source of inspiration:

• RxFeedback
• Workflow