alluxio.client.file

Class FileSystemCache

java.lang.Object

alluxio.client.file.FileSystemCache

@ThreadSafe
public class FileSystemCache
extends Object

A cache for storing FileSystem clients. This should only be used by the Factory class.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	FileSystemCache.InstanceCachingFileSystem A wrapper class on a FileSystem instance.
static class	FileSystemCache.Key A key which can be used to look up a FileSystem instance in the FileSystemCache.
static class	FileSystemCache.Value A value wraps a FileSystem instance and a ref count in the FileSystemCache.

Constructor Summary

Constructors

Constructor and Description
FileSystemCache() Constructs a new cache for file system instances.

Method Summary

Modifier and Type	Method and Description
FileSystem	get(FileSystemCache.Key key) Gets a FileSystem instance from the cache.

Methods inherited from class java.lang.Object

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

Constructor Detail

FileSystemCache

public FileSystemCache()

Constructs a new cache for file system instances.

Method Detail

get

public FileSystem get(FileSystemCache.Key key)

Gets a FileSystem instance from the cache. If there is none, a new instance is created and inserted into the cache. Note that, the returned instance will be a wrapper of the cached instance which has its own close state.

Parameters:

key - the key to retrieve a FileSystem

Returns:

the FileSystem associated with the key