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public interface ConfigProvider extends Configurable, Closeable {
     
    // Configure this class with the initialization parameters
    void configure(Map<String, ?> configs);
 
    // Lookup up the data at the given path.
    ConfigData get(ConfigContext ctx, String path);

    // Lookup up the data with the given keys at the given path.
    ConfigData get(ConfigContext ctx, String path, Set<String> keys);
 
    // The ConfigProvider is responsible for making this callback whenever the key changes.
    // Some ConfigProviders may want to have a background thread with a configurable update interval.
    void subscribe(String key, ConfigurationChangeCallback callback);

    // Inverse of subscribe
    void unsubscribe(String key);
 
    // Close all subscriptions and clean up all resources
    void close();
}

public interface ConfigurationChangeCallback {
    void onChange(String key, String value);
}
 
public interface ConfigContext {
 
    // The name of the client
    String name();
 
    // Schedule a reload, possibly for secrets rotation
    void scheduleConfigReload(long delayMs);
}
 
public class ConfigData {

    private Map<String, String> metadata;
    private Map<String, String> data;

    public ConfigData(Map<String, String> metadata, Map<String, String> data) {
        this.metadata = metadata;
        this.data = data;
    }

    public Map<String, String> metadata() {
        return metadata;
    }

    public Map<String, String> data() {
        return data;
    }
}