com.google.cloud.tools.jib.cache

Class CacheWriter

java.lang.Object

com.google.cloud.tools.jib.cache.CacheWriter

public class CacheWriter
extends Object

Writes UnwrittenLayers to the cache.

Constructor Summary

Constructors

Constructor and Description
CacheWriter(Cache cache)

Method Summary

Modifier and Type	Method and Description
CachedLayer	getCachedLayer(long layerSize, DescriptorDigest layerDigest) Gets the layer that was cached by writing the contents to a file in the cache.
com.google.common.io.CountingOutputStream	getLayerOutputStream(DescriptorDigest layerDigest)
CachedLayerWithMetadata	writeLayer(ReproducibleLayerBuilder reproducibleLayerBuilder) Builds an UnwrittenLayer from a ReproducibleLayerBuilder and compresses and writes the UnwrittenLayer's uncompressed layer content BLOB to cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

CacheWriter

public CacheWriter(Cache cache)

Method Detail

writeLayer

public CachedLayerWithMetadata writeLayer(ReproducibleLayerBuilder reproducibleLayerBuilder)
                                   throws IOException

Builds an UnwrittenLayer from a ReproducibleLayerBuilder and compresses and writes the UnwrittenLayer's uncompressed layer content BLOB to cache.

Parameters:

reproducibleLayerBuilder - the layer builder

Returns:

the cached layer with accompanying LayerMetadata

Throws:

IOException - if writing the layer to file fails

getLayerOutputStream

public com.google.common.io.CountingOutputStream getLayerOutputStream(DescriptorDigest layerDigest)
                                                               throws IOException

Parameters:

layerDigest - the written layer's digest.

Returns:

the CountingOutputStream to write to to cache a layer with the specified compressed digest.

Throws:

IOException - if writing to the layer file's output stream fails.

getCachedLayer

public CachedLayer getCachedLayer(long layerSize,
                                  DescriptorDigest layerDigest)
                           throws IOException

Gets the layer that was cached by writing the contents to a file in the cache. The returned CachedLayer should be added to the cache metadata.

Parameters:

layerSize - the size of the layer

layerDigest - the digest of the layer to retrieve

Returns:

a CachedLayer from a layer digest and the CountingOutputStream the layer BLOB was written to

Throws:

IOException - if closing the output stream or getting the layer diff ID fails