ConfigSourceRuntime (Helidon Project 2.6.9 API)

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

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`description()`	Description of the underlying config source.
`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.
`Optional<ConfigNode.ObjectNode>`	`load()`	Load the config source if it is eager (such as `ParsableSource` or `NodeConfigSource`.
`Optional<ConfigNode>`	`node(String key)`	Get a single config node based on the key.
`void`	`onChange(BiConsumer<String,ConfigNode> change)`	Change support for a runtime.

- Method Detail
  - 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