alluxio.client.file

Class CacheContext

java.lang.Object

alluxio.client.file.CacheContext

public class CacheContext
extends Object

Cache related context.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CacheContext.StatsUnit Stats Unit.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CacheContext() Expected to be inherited in PrestoDB or other local cache caller.

Method Summary

Modifier and Type	Method and Description
static CacheContext	defaults()
boolean	equals(Object o)
String	getCacheIdentifier() Returns an string as a hint from computation to indicate the file.
CacheQuota	getCacheQuota()
CacheScope	getCacheScope()
HiveCacheContext	getHiveCacheContext()
int	hashCode()
void	incrementCounter(String name, CacheContext.StatsUnit unit, long value) Increments the counter name by value.
boolean	isTemporary()
CacheContext	setCacheIdentifier(String identifier)
CacheContext	setCacheQuota(CacheQuota cacheQuota)
CacheContext	setCacheScope(CacheScope cacheScope)
CacheContext	setHiveCacheContext(HiveCacheContext hiveCacheContext)
CacheContext	setTemporary(boolean isTemporary)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

CacheContext

protected CacheContext()

Expected to be inherited in PrestoDB or other local cache caller. Subclasses could override the callback methods such as incrementCounter

Method Detail

defaults

public static CacheContext defaults()

Returns:

the default CacheContext

getCacheIdentifier

@Nullable
public String getCacheIdentifier()

Returns an string as a hint from computation to indicate the file. Note that, this can be independent and different from Alluxio File ID stored in URIStatus.mInfo, which is assigned and maintained by Alluxio master. In cases like using Alluxio local cache, such Alluxio File ID may not be available.

Returns:

the unique string identifier of the entity to cache

getHiveCacheContext

@Nullable
public HiveCacheContext getHiveCacheContext()

Returns:

the hive cache context

getCacheQuota

public CacheQuota getCacheQuota()

Returns:

the cache quota

getCacheScope

public CacheScope getCacheScope()

Returns:

the cache scope

setCacheIdentifier

public CacheContext setCacheIdentifier(String identifier)

Parameters:

identifier - the id to use

Returns:

the updated CacheContext

setCacheQuota

public CacheContext setCacheQuota(CacheQuota cacheQuota)

Parameters:

cacheQuota - the cache quota

Returns:

the updated CacheContext

setCacheScope

public CacheContext setCacheScope(CacheScope cacheScope)

Parameters:

cacheScope - the cache quota

Returns:

the updated CacheContext

setHiveCacheContext

public CacheContext setHiveCacheContext(HiveCacheContext hiveCacheContext)

Parameters:

hiveCacheContext - the hive cache context

Returns:

the updated CacheContext

isTemporary

public boolean isTemporary()

Returns:

whether the caching data is temporary

setTemporary

public CacheContext setTemporary(boolean isTemporary)

Parameters:

isTemporary - whether the caching data is temporary

Returns:

the updated CacheContext

incrementCounter

public void incrementCounter(String name,
                             CacheContext.StatsUnit unit,
                             long value)

Increments the counter name by value.

Default implementation does nothing. Subclass can implement its own tracking mechanism.

Parameters:

name - name of the counter

unit - unit of the counter

value - value of the counter

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object