Load dynamic objects from application.properties in Spring Boot-CodePudding

I currently have a microservice in Spring Boot, where I have some properties stored in application.properties. Right now, it is configured for one store only. But I want to change the logic so that stores can be added dynamically without needing to change any code.

I have created a model java class for a store, and it looks like this:

public class Store {
    private String username;
    private String password;
    private String hostname;
    private int port;
}

My application.properties looks like this today:

system.connection.username=TestUser
system.connection.password=123456
system.connection.hostname=12.34.56.78
system.connection.port=1234

But I want to be able to specify which store it is, and be able to add more stores by just adding them into the application.properties, like this:

system.connection.Store1.username=TestUser1
system.connection.Store1.password=123456
system.connection.Store1.hostname=12.34.56.78
system.connection.Store1.port=1234

system.connection.Store2.username=TestUser2
system.connection.Store2.password=859382
system.connection.Store2.hostname=34.34.34.34
system.connection.Store2.port=4444

Then add this into some hashmap, and be able to check for and retrieve the variables for a specific store from any of my other classes.

For this, I have tried the following:

@Configuration
@ConfigurationProperties(prefix = "system.connection")
class StoresConfiguration(
    val stores: HashMap<String, Store> = HashMap()
) {

    fun getStore(storeName: String): Store? {
        return stores.get(storeName)
    }


}

But getStore only returns null, and even if I check stores.size it is 0. So where am I doing wrong, and how can I do this effectively? I have thought about just skipping the crap and just making a folder called "stores" and put json files in it, and read from there. So that each Store is just a json file, so at startup the app scans the folder and for every json file makes a Store object. But I don't know if that is a good solution. This is my first time working with Spring Boot. Thanks for any help!

CodePudding user response：

Would this be helpful? This is using an indexed list in a ConfigurationProperties class.

@ConfigurationProperties("system.connection")
// use a fitting name here
public class Stores {

    // reference your Store type
    private final List<Store> store = new ArrayList<>();

    public List<Store> getStore() {
        return this.store;
    }

}

system.connection.store[0].username=foo
system.connection.store[0].password=pass1
...
system.connection.store[1].username=bar
system.connection.store[1].password=pass2

Later an example with a map is also given in the above link, but the list approach with the indices might better fit your needs.

CodePudding user response：

Use store as an array to solve the problem.