alluxio.client.file

Class MetadataCache

java.lang.Object

alluxio.client.file.MetadataCache

@ThreadSafe
public final class MetadataCache
extends Object

Cache for metadata of paths.

Constructor Summary

Constructors

Constructor and Description
MetadataCache(int maxSize, long expirationTimeMs)

Method Summary

Modifier and Type	Method and Description
URIStatus	get(AlluxioURI path)
void	invalidate(AlluxioURI path) Invalidates the cache of path.
List<URIStatus>	listStatus(AlluxioURI dir)
void	put(AlluxioURI dir, List<URIStatus> statuses) Caches list status results of a directory.
void	put(AlluxioURI path, URIStatus status)
void	put(String path, URIStatus status)
long	size()

Methods inherited from class java.lang.Object

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

Constructor Detail

MetadataCache

public MetadataCache(int maxSize,
                     long expirationTimeMs)

Parameters:

maxSize - the max size of the cache

expirationTimeMs - the expiration time (in milliseconds) of the cached item

Method Detail

get

@Nullable
public URIStatus get(AlluxioURI path)

Parameters:

path - the Alluxio path

Returns:

the cached status or null

put

public void put(AlluxioURI path,
                URIStatus status)

Parameters:

path - the Alluxio path

status - the status to be cached

put

public void put(String path,
                URIStatus status)

Parameters:

path - the Alluxio path

status - the status to be cached

put

public void put(AlluxioURI dir,
                List<URIStatus> statuses)

Caches list status results of a directory.

Parameters:

dir - the directory

statuses - the list status results

listStatus

@Nullable
public List<URIStatus> listStatus(AlluxioURI dir)

Parameters:

dir - the directory

Returns:

the cached list status results or null

invalidate

public void invalidate(AlluxioURI path)

Invalidates the cache of path.

Parameters:

path - the path

size

public long size()

Returns:

the cache size