com.netflix.hollow.api.consumer.fs

Class HollowFilesystemBlobRetriever

java.lang.Object

com.netflix.hollow.api.consumer.fs.HollowFilesystemBlobRetriever

All Implemented Interfaces:

HollowConsumer.BlobRetriever

public class HollowFilesystemBlobRetriever
extends java.lang.Object
implements HollowConsumer.BlobRetriever

Constructor Summary

Constructors

Constructor and Description
HollowFilesystemBlobRetriever(java.nio.file.Path blobStorePath) A new HollowFilesystemBlobRetriever which is not backed by a remote store.
HollowFilesystemBlobRetriever(java.nio.file.Path blobStorePath, HollowConsumer.BlobRetriever fallbackBlobRetriever) A new HollowFileSystemBlobRetriever which is backed by a remote store.

Method Summary

Modifier and Type	Method and Description
HollowConsumer.Blob	retrieveDeltaBlob(long currentVersion) Returns a delta transition which can be applied to the specified version identifier
HollowConsumer.Blob	retrieveReverseDeltaBlob(long currentVersion) Returns a reverse delta transition which can be applied to the specified version identifier
HollowConsumer.Blob	retrieveSnapshotBlob(long desiredVersion) Returns the snapshot for the state with the greatest version identifier which is equal to or less than the desired version

Methods inherited from class java.lang.Object

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

Constructor Detail

HollowFilesystemBlobRetriever

public HollowFilesystemBlobRetriever(java.nio.file.Path blobStorePath)

A new HollowFilesystemBlobRetriever which is not backed by a remote store.

Parameters:

blobStorePath - The directory from which to retrieve blobs

Since:

2.12.0

HollowFilesystemBlobRetriever

public HollowFilesystemBlobRetriever(java.nio.file.Path blobStorePath,
                                     HollowConsumer.BlobRetriever fallbackBlobRetriever)

A new HollowFileSystemBlobRetriever which is backed by a remote store. When a blob from the remote store is requested which exists locally, then the local copy is used. When a blob from the remote store is requested which does not exist locally, it is copied to the filesystem right before it is loaded.

Parameters:

blobStorePath - The directory from which to retrieve blobs, if available

fallbackBlobRetriever - The remote blob retriever from which to retrieve blobs if they are not already available on the filesystem.

Since:

2.12.0

Method Detail

retrieveSnapshotBlob

public HollowConsumer.Blob retrieveSnapshotBlob(long desiredVersion)

Description copied from interface: HollowConsumer.BlobRetriever

Returns the snapshot for the state with the greatest version identifier which is equal to or less than the desired version

Specified by:

retrieveSnapshotBlob in interface HollowConsumer.BlobRetriever

Parameters:

desiredVersion - the desired version

Returns:

the blob of the snapshot

retrieveDeltaBlob

public HollowConsumer.Blob retrieveDeltaBlob(long currentVersion)

Description copied from interface: HollowConsumer.BlobRetriever

Returns a delta transition which can be applied to the specified version identifier

Specified by:

retrieveDeltaBlob in interface HollowConsumer.BlobRetriever

Parameters:

currentVersion - the current version

Returns:

the blob of the delta

retrieveReverseDeltaBlob

public HollowConsumer.Blob retrieveReverseDeltaBlob(long currentVersion)

Description copied from interface: HollowConsumer.BlobRetriever

Returns a reverse delta transition which can be applied to the specified version identifier

Specified by:

retrieveReverseDeltaBlob in interface HollowConsumer.BlobRetriever

Parameters:

currentVersion - the current version

Returns:

the blob of the reverse delta