yamlconfig

Java Application Configuration

Retrieving settings from configuration:

configurations:
  -
    namespace: ramsdenj
    keys:
      sampleKey: sampleValue
      sampleKeyMap:
        nestedKeyOne: nestedValueOne
        nestedKeyTwo: nestedValueTwo
  -
    namespace: ramsdenj.myappgroup.myapp
    keys:
      sampleKey: sampleValueOverride
  -
    namespace: ramsdenj.myappgroup.myapp.dev.us-east-1
    keys:
      sampleKeyTwo: sampleValueTwo

YamlConfig yamlConfig = new YamlConfigImpl("ramsdenj", configurationInstanceProvider);
yamlConfig.getSetting("sampleKey");                     // returns "sampleValue"
yamlConfig.getSetting("sampleKeyMap->nestedKeyOne")     // returns "nestedValueOne"

YamlConfig yamlConfig = new YamlConfigImpl("ramsdenj.myappgroup.myapp", configurationInstanceProvider);
yamlConfig.getSetting("sampleKey");     // returns "sampleValueOverride"
yamlConfig.getSetting("sampleKeyTwo");  // throws ConfigurationKeyNotFoundException

You can also retrieve POJOs:

configurations:
  -
    namespace: ramsdenj
    keys:
      point:
        x: 1.0
        y: 2.2

YamlConfig yamlConfig = new YamlConfigImpl("ramsdenj.myappgroup.myapp.dev", configurationInstanceProvider);
yamlConfig.getSetting("point", Point.class);            // returns an instance of Point.

You should never define the same key in the same scope more than once. If the same key is defined more than once in the same scope, the key will be overwritten so the last key encountered will be the one taken. Since the order configuration is read is not guaranteed, this will result in non-deterministic behavior.