Konfi - java properties library

Main features

• Clean type safe interface based properties
• Optional values
• Set and List collections
• Refresh properties without restarting your app
• Properties sources
  • OS environment variables
  • System properties
  • File packaged inside your jar (attached resources)
  • File outside your Jar
  • Custom source by implementing the Source interface

Getting started

1. Add a dependency

Apache Maven

  <dependency>
    <groupId>io.github.nirro01</groupId>
    <artifactId>konfi-core</artifactId>
    <version>0.0.1</version>
  </dependency>

Gradle Groovy DSL

implementation 'io.github.nirro01:konfi-core:0.0.1'

Gradle Kotlin DSL

implementation("io.github.nirro01:konfi-core:0.0.1")

2. Define your properties definitions using the @KonfiProperty annotation

public interface AmusementParkProperties {

    @KonfiProperty(key = "amusement.park.name", description = "Amusement park name")
    String name();
    
    @KonfiProperty(key = "amusement.park.phone-numbers", description = "Amusement park phone numbers")
    Set<String> phoneNumbers();
    
    @KonfiProperty(key = "amusement.park.email", description = "Amusement park email address")
    Optional<String> email();
    
    @KonfiProperty(key = "amusement.park.roller-coaster.minimum-height-cm", description = "Minimum height in centimeters for using the roller coaster")
    Integer rollerCoasterMinimumHeight();
    
    @KonfiProperty(key = "amusement.park.roller-coaster.active", description = "Roller coaster active")
    Boolean rollerCoasterActive();
}

3. Define ordered list of properties sources

  var environmentVariablesSource = PropertiesSources.newEnvironmentVariablesSource();
  var systemPropertiesSource = PropertiesSources.newSystemPropertiesSource();
  var externalFileSource = PropertiesSources.newExternalFileSource("app.properties");
  var internalFileSource = PropertiesSources.newInternalFileSource("app.properties");
  var sources = List.of(environmentVariablesSource, systemPropertiesSource, externalFileSource, internalFileSource)

4. Build instance of your interface

  AmusementParkProperties amusementParkProperties = Konfi
          .builder(AmusementParkProperties.class)
          .sources(sources)
          .build();
  String name = amusementParkProperties.name();
  System.out.println(name);

5. Refresh properties on demand

  Konfi.refresh(amusementParkProperties);
  System.out.println(amusementParkProperties.name());