PollableSource (Helidon Project 2.6.9 API)

Type Parameters:

S - the type of the stamp used by the source (such as byte[] with a digest of a file)

All Known Implementing Classes:

ConfigSources.SystemPropertiesConfigSource, DirectoryConfigSource, EtcdConfigSource, FileConfigSource, FileOverrideSource, GitConfigSource, MapConfigSource, UrlConfigSource, UrlOverrideSource
```
public interface PollableSource<S>
```
A source implementing this interface provides support for polling using a PollingStrategy. This is achieved through a stamp passed between the source and the strategy to check for changes.

See Also:

PollingStrategy

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface PollableSource.Builder<T extends PollableSource.Builder<T>>
A builder for pollable source.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`boolean`	`isModified(S stamp)`	This method is invoked to check if this source has changed.
`Optional<PollingStrategy>`	`pollingStrategy()`	If a polling strategy is configured with this source, return it.

- Method Detail
  - isModified
```
boolean isModified(S stamp)
```
    This method is invoked to check if this source has changed.
    
    Parameters:
    
    stamp - the stamp of the last loaded content
    
    Returns:
    
    true if the current data of this config source differ from the loaded data, including cases when the source has disappeared
  - pollingStrategy
```
Optional<PollingStrategy> pollingStrategy()
```
    If a polling strategy is configured with this source, return it. The source implementation does not need to handle polling strategy.
    
    Returns:
    
    polling strategy if one is configured on this source