[GitHub] QubitPi opened a new issue #6634: Dependency Injection in DruidModule extension

[GitBox <gi...@apache.org>]

QubitPi opened a new issue #6634: Dependency Injection in DruidModule extension
URL: https://github.com/apache/incubator-druid/issues/6634
 
 
   We are writing a custom registered lookup module. We have an object like this
   
   ```java
   public class Foo {
   
       @Inject // Guice inject
       Foo(@PayPal CreditCardProcessor processor) {
           ...
       }
   }
   ```
   
   We are using binding annotation to bind `CreditCardProcessor` type to `PayPalCreditCardProcessor`. But our `CreditCardProcessor` is created via Jackson binding
   
   ```java
   public class PayPalCreditCardProcessor implements CreditCardProcessor {
   
       @JsonCreator
       PayPalCreditCardProcessor(@JsonProperty("cardNumber") String cardNumber) {
           ...
       }
   }
   ```
   
   How do we make this dependency graph happen?
   
   Looks like for Guice to traverse dependency graph down to `PayPalCreditCardProcessor`, I had to bind it with Guice annotation like this
   
   ```java
       @Inject // Guice inject
       @JsonCreator
       PayPalCreditCardProcessor(@JsonProperty("cardNumber") String cardNumber) {
           ...
       }
   ```
   
   But when I did that, it asked for a instance binding for `cardNumber` which seems to be impossible via Jackson binding. Am I wrong? How do I make dependency injection start with Guice binding and have a terminal injection via Jackson?

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