toothpick

A scope tree based Dependency Injection (DI) library for Java / Kotlin / Android.

stephanenicolas
1123
115
Java

Toothpick (a.k.a T.P. like a teepee)

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What is Toothpick ?

Toothpick is a scope tree based Dependency Injection (DI) library for Java.

It is a full-featured, runtime based, but reflection free, implementation of JSR 330.

What does Toothpick offer ?

//a typical Toothpick scope tree during the execution of an Android app.

           @ApplicationScope 
             /          |    \  
            /           |     \
           /            |      \
   @ViewModelScope      |   Service 2
         /              | 
        /            Service 1  
       /            
 @Activity1Scope
      /
     /
Activity 1
   /   \
  /   Fragment 2
 /
Fragment 1

Scopes offer to compartmentalize memory during the runtime of an app and prevent memory leaks.
All dependencies created via Toothpick, and available for injections, will be fully garbage collected when this scope is closed.
To learn more about scopes, read TP wiki.

Toothpick is :

Examples

This is the example:

Setup

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For Android :

#android setup using gradle 5.5.1
buildscript {
  repositories {
    google()
    jcenter()
  }
  dependencies {
    classpath 'com.android.tools.build:gradle:3.4.x'
  }
}

...
#for java
dependencies {
  implementation 'com.github.stephanenicolas.toothpick:toothpick-runtime:3.x'
  // and for android -> implementation 'com.github.stephanenicolas.toothpick:smoothie-androidx:3.x'
  annotationProcessor 'com.github.stephanenicolas.toothpick:toothpick-compiler:3.x'

  //highly recommended
  testImplementation 'com.github.stephanenicolas.toothpick:toothpick-testing-junit5:3.x'
  testImplementation 'mockito or easymock'
}

#for kotlin
dependencies {
  implementation 'com.github.stephanenicolas.toothpick:ktp:3.x'
  kapt 'com.github.stephanenicolas.toothpick:toothpick-compiler:3.x'

  //highly recommended
  testImplementation 'com.github.stephanenicolas.toothpick:toothpick-testing-junit5:3.x'
  testImplementation 'mockito or easymock'
}

For java:

<!--java setup with maven -->
  <dependencies>
    <dependency>
      <groupId>com.github.stephanenicolas.toothpick</groupId>
      <artifactId>toothpick-compiler</artifactId>
      <version>3.x</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>com.github.stephanenicolas.toothpick</groupId>
      <artifactId>toothpick-runtime</artifactId>
      <version>3.x</version>
      <scope>compile</scope>
    </dependency>
    
    <!-- highly recommended-->
    <dependency> 
      <groupId>com.github.stephanenicolas.toothpick</groupId>
      <artifactId>toothpick-testing</artifactId>
      <version>3.x</version>
      <scope>test</scope>
    </dependency>
    <dependency>
    <easymock or mockito>
    </dependency>
  </dependencies>

Support

TP is actively maintained and we provide support to questions via the Toothpick-di tag on Stack Over Flow.

Ask questions on Stack Over Flow while keeping the GitHub issue board for real issues. Thx in advance !

Talks & Articles

Wanna know more ?

Visit Toothpick’s wiki !

Alternative Dependency Injection (DI) engines for Android

Libs / Apps using TP 2

  • Okuki is a simple, hierarchical navigation bus and back stack for Android, with optional Rx bindings, and Toothpick DI integration.
  • KotlinWeather is a simple example of using ToothPick with Kotlin and gradle integration using kapt.

Credits

TP 1 & 3 have been developped by Stephane Nicolas and Daniel Molinero Reguera.
Most of the effort on version 2 has been actively supported by Groupon. Thanks for this awesome OSS commitment !