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# Understanding Dagger

---

# Agenda

1. Dependency Injection
2. Why Dagger
3. Code

תֵּן לְחָכָם וְיֶחְכַּם עוֹד הוֹדַע לְצַדִּיק וְיוֹסֶף לֶקַח. 

---

# Dependency Injection
``` java
class ShoppingManager{
ShoppingManager(String country, String currency,String stripeUrl,
        String stripeUsername, String password, String shoppingCartId){
    TaxCalculator calculator = new TaxCalculator(country, currency);
    Stripe stripe = new Stripe(stripeUrl,stripePassword);
    Shoppingcart cart = ShoppingCartManager.getShoppingCart(shoppingCartId);

    this.calculator = calculator;
    this.stripe = stripe;
    this.cart = cart;

   }
   public purchase(String itemId){
     ...
   }
}
```
 Unit test:

 ```java
 class ShoppingManagerTest {
   ShoppingManager manager;
   @Before
   public init() {
      manager = new ShoppingManager("Israel", "NIS", 
      "https://stripe.api.com/v1", "admin", "1234", "8");
   }

   @test
   public test() {
     //get me a nice gucci coat
     manager.purchase("gsdgfhgfahj")
     assert(....)
   }
 }
 ```

---

# What is the problem?


---

#Dependency injection to the rescue

``` java
class ShoppingManager{
ShoppingManager(TaxCalculator calculator ,Stripe stripe, Shoppingcart cart){
    this.calculator = calculator;
    this.stripe = stripe;
    this.cart = cart;
   }
   public purchase(String itemId){
     ...
   }
}
```


---

# But now we just moved the problem


---

# Dagger to the rescue

---
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