Hands-On Microservices with Kotlin

Creating a map of customers

But before exploring how we can answer a path request, we need to have a set of customers that we could use, so we could filter them in our new requests.

First, let's modify our application to create a bean that represents our customers:

package com.microservices.chapter3import org.springframework.boot.autoconfigure.SpringBootApplicationimport org.springframework.boot.runApplicationimport org.springframework.context.annotation.Beanimport java.util.concurrent.ConcurrentHashMap@SpringBootApplicationclass Chapter3Application {  companion object {    val initialCustomers = arrayOf(Customer(1, "Kotlin"),        Customer(2, "Spring"),        Customer(3, "Microservice"))  }  @Bean fun customers() = ConcurrentHashMap<Int, Customer>(initialCustomers.associateBy(Customer::id)) ...