BuildAndCacheApplicationLayerStep.java

class BuildAndCacheApplicationLayerStep
    implements AsyncStep<CachedLayerWithMetadata>, Callable<CachedLayerWithMetadata> {

  /*(...)*/
  @Override
  public CachedLayerWithMetadata call() throws IOException, CacheMetadataCorruptedException {
    /*(...)*/      
    CachedLayerWithMetadata cachedLayer =
          new CacheReader(cache)
              .getUpToDateLayerByLayerEntries(layerConfiguration.getLayerEntries());
      if (cachedLayer != null) {
        return cachedLayer;
      }

      ReproducibleLayerBuilder reproducibleLayerBuilder = new ReproducibleLayerBuilder();
      for (LayerEntry layerEntry : layerConfiguration.getLayerEntries()) {
        reproducibleLayerBuilder.addFiles(
            layerEntry.getSourceFiles(), layerEntry.getExtractionPath());
      }

      cachedLayer = new CacheWriter(cache).writeLayer(reproducibleLayerBuilder);
      /*(...)*/
      return cachedLayer;
    }
  }
  /*(...)*/
}