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Dagger 2 instance sharing with scopes or named qualifiers

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Im in the process of setting up my object graph and ran into the following situation. I have provided a simplified tree of classes here as an example. It

• Recipe Book
  
  
  • Apple Pie
    
    
    • Ingredients
      
      
      • Apple
      
      
      • Crust
      
      
    
    
    • Instructions
      
      
      • Crust
      
      
      • Apple
      
      
    
    
  
  
  • Apple Jam
    
    
    • Ingredients
      
      
      • Apple
      
      
      • Jar
      
      
    
    
    • Instructions
      
      
      • Jar
      
      
    
    
  
  

The problem I am having is figuring out the best way to structure this in dagger. Essentially, within each Ingredients class, I need the instances of each ingredient to be the same. However, I don't want the Apple instance to be shared between each recipe.

I have tried named qualifiers, but that ends up getting really ugly, really fast. It seems clunky to have to create a provides method for each Apple to give it a name.

Additionally, I have tried a solution where I have created a SubComponent that would have a method to get the Apple. Then I would create a scoped @provides method for that component in the SubComponent meant to make my Ingredients.

My question is, what is typically the best approach for this task?

dagger-2

share|improve this question

asked Mar 27 at 21:32

Justin BreitfellerJustin Breitfeller

12.1k44 gold badges3434 silver badges4747 bronze badges

add a comment | 

0

Im in the process of setting up my object graph and ran into the following situation. I have provided a simplified tree of classes here as an example. It

• Recipe Book
  
  
  • Apple Pie
    
    
    • Ingredients
      
      
      • Apple
      
      
      • Crust
      
      
    
    
    • Instructions
      
      
      • Crust
      
      
      • Apple
      
      
    
    
  
  
  • Apple Jam
    
    
    • Ingredients
      
      
      • Apple
      
      
      • Jar
      
      
    
    
    • Instructions
      
      
      • Jar
      
      
    
    
  
  

The problem I am having is figuring out the best way to structure this in dagger. Essentially, within each Ingredients class, I need the instances of each ingredient to be the same. However, I don't want the Apple instance to be shared between each recipe.

I have tried named qualifiers, but that ends up getting really ugly, really fast. It seems clunky to have to create a provides method for each Apple to give it a name.

Additionally, I have tried a solution where I have created a SubComponent that would have a method to get the Apple. Then I would create a scoped @provides method for that component in the SubComponent meant to make my Ingredients.

My question is, what is typically the best approach for this task?

dagger-2

share|improve this question

asked Mar 27 at 21:32

Justin BreitfellerJustin Breitfeller

12.1k44 gold badges3434 silver badges4747 bronze badges

add a comment | 

Im in the process of setting up my object graph and ran into the following situation. I have provided a simplified tree of classes here as an example. It

• Recipe Book
  
  
  • Apple Pie
    
    
    • Ingredients
      
      
      • Apple
      
      
      • Crust
      
      
    
    
    • Instructions
      
      
      • Crust
      
      
      • Apple
      
      
    
    
  
  
  • Apple Jam
    
    
    • Ingredients
      
      
      • Apple
      
      
      • Jar
      
      
    
    
    • Instructions
      
      
      • Jar
      
      
    
    
  
  

The problem I am having is figuring out the best way to structure this in dagger. Essentially, within each Ingredients class, I need the instances of each ingredient to be the same. However, I don't want the Apple instance to be shared between each recipe.

I have tried named qualifiers, but that ends up getting really ugly, really fast. It seems clunky to have to create a provides method for each Apple to give it a name.

Additionally, I have tried a solution where I have created a SubComponent that would have a method to get the Apple. Then I would create a scoped @provides method for that component in the SubComponent meant to make my Ingredients.

My question is, what is typically the best approach for this task?

dagger-2

share|improve this question

asked Mar 27 at 21:32

Justin BreitfellerJustin Breitfeller

12.1k44 gold badges3434 silver badges4747 bronze badges

share|improve this question

asked Mar 27 at 21:32

Justin BreitfellerJustin Breitfeller

12.1k44 gold badges3434 silver badges4747 bronze badges

share|improve this question

asked Mar 27 at 21:32

Justin BreitfellerJustin Breitfeller

12.1k44 gold badges3434 silver badges4747 bronze badges

asked Mar 27 at 21:32

Justin BreitfellerJustin Breitfeller

12.1k44 gold badges3434 silver badges4747 bronze badges

asked Mar 27 at 21:32

Justin BreitfellerJustin Breitfeller

12.1k44 gold badges3434 silver badges4747 bronze badges