Module io.helidon.config
Package io.helidon.config

Interface ConfigSourceRuntime

public interface ConfigSourceRuntime
The runtime of a config source. For a single Config, there is one source runtime for each configured config source.

  • Method Details

    • onChange

      void onChange(BiConsumer<String,ConfigNode> change)
      Change support for a runtime.
      Parameters:
      change - change listener

    • load

      Optional<ConfigNode.ObjectNode> load()
      Load the config source if it is eager (such as ParsableSource or NodeConfigSource.

      For LazyConfigSource, this method may return an empty optional (if no key was yet requested), or a node with currently known keys and values.

      Returns:
      loaded data

    • node

      Optional<ConfigNode> node(String key)
      Get a single config node based on the key. Use this method if you are interested in a specific key, as it works both for eager and lazy config sources.
      Parameters:
      key - key of the node to retrieve
      Returns:
      value on the key, or empty if not present

    • description

      String description()
      Description of the underlying config source.
      Returns:
      description of the source

    • isLazy

      boolean isLazy()
      If a config source is lazy, its load() method always returns empty and you must use node(String) methods to retrieve its values.
      Returns:
      true if the underlying config source cannot load whole configuration tree