com.google.cloud.tools.jib.cache

Class CacheReader

java.lang.Object

com.google.cloud.tools.jib.cache.CacheReader

public class CacheReader
extends Object

Reads image content from the cache.

Constructor Summary

Constructors

Constructor and Description
CacheReader(Cache cache)

Method Summary

Modifier and Type	Method and Description
CachedLayer	getLayer(DescriptorDigest layerDigest)
Path	getLayerFile(List<Path> sourceFiles) Finds the file that stores the content BLOB for an application layer.
CachedLayer	getUpToDateLayerBySourceFiles(List<Path> sourceFiles) Gets an up-to-date layer that is built from the sourceFiles.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CacheReader

public CacheReader(Cache cache)

Method Detail

getLayer

@Nullable
public CachedLayer getLayer(DescriptorDigest layerDigest)
                               throws LayerPropertyNotFoundException

Returns:

the cached layer with digest layerDigest, or null if not found

Throws:

LayerPropertyNotFoundException

getLayerFile

@Nullable
public Path getLayerFile(List<Path> sourceFiles)
                            throws CacheMetadataCorruptedException

Finds the file that stores the content BLOB for an application layer.

Parameters:

sourceFiles - the source files the layer must be built from

Returns:

the newest cached layer file that matches the layerType and sourceFiles, or null if there is no match

Throws:

CacheMetadataCorruptedException

getUpToDateLayerBySourceFiles

@Nullable
public CachedLayer getUpToDateLayerBySourceFiles(List<Path> sourceFiles)
                                                    throws IOException,
                                                           CacheMetadataCorruptedException

Gets an up-to-date layer that is built from the sourceFiles.

The method returns the first up-to-date layer found. This is safe because the source files will not have been modified since creation of any up-to-date layer (ie. all up-to-date layers should have the same file contents)

Throws:

IOException

CacheMetadataCorruptedException