tachyon

Class StorageDirId

java.lang.Object

tachyon.StorageDirId

public class StorageDirId
extends Object

Used to identify StorageDir in hierarchy store.

Method Summary

Methods

Modifier and Type	Method and Description
static int	compareStorageLevel(long storageDirIdLeft, long storageDirIdRight) Compare storage level of StorageDirs
static long	getStorageDirId(int level, int storageLevelAliasValue, int dirIndex) Generate StorageDirId from given information
static int	getStorageDirIndex(long storageDirId) Get index of the StorageDir in the StorageTier which contains it
static int	getStorageLevel(long storageDirId) Get storage level of StorageTier which contains the StorageDir
static int	getStorageLevelAliasValue(long storageDirId) Get StorageLevelAlias value from StorageDirId
static boolean	isUnknown(long storageDirId) Check whether the value of StorageDirId is UNKNOWN
static long	unknownId() Get unknown value of StorageDirId, which indicates the StorageDir is unknown

Methods inherited from class java.lang.Object

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

Method Detail

compareStorageLevel

public static int compareStorageLevel(long storageDirIdLeft,
                      long storageDirIdRight)

Compare storage level of StorageDirs

Parameters:

storageDirIdLeft - The left value of StorageDirId to be compared

storageDirIdRight - The right value of StorageDirId to be compared

Returns:

negative if storage level of left StorageDirId is higher than the right one, zero if equals, positive if lower.

getStorageDirId

public static long getStorageDirId(int level,
                   int storageLevelAliasValue,
                   int dirIndex)

Generate StorageDirId from given information

Parameters:

level - storage level of the StorageTier which contains the StorageDir

storageLevelAliasValue - StorageLevelAlias value of the StorageTier

dirIndex - index of the StorageDir

Returns:

StorageDirId generated

getStorageDirIndex

public static int getStorageDirIndex(long storageDirId)

Get index of the StorageDir in the StorageTier which contains it

Parameters:

storageDirId - Id of the StorageDir

Returns:

index of the StorageDir

getStorageLevel

public static int getStorageLevel(long storageDirId)

Get storage level of StorageTier which contains the StorageDir

Parameters:

storageDirId - Id of the StorageDir

Returns:

storage level of the StorageTier which contains the StorageDir

getStorageLevelAliasValue

public static int getStorageLevelAliasValue(long storageDirId)

Get StorageLevelAlias value from StorageDirId

Parameters:

storageDirId - Id of the StorageDir

Returns:

value of StorageLevelAlias

isUnknown

public static boolean isUnknown(long storageDirId)

Check whether the value of StorageDirId is UNKNOWN

Parameters:

storageDirId - Id of the StorageDir

Returns:

true if StorageDirId is UNKNOWN, false otherwise.

unknownId

public static long unknownId()

Get unknown value of StorageDirId, which indicates the StorageDir is unknown

Returns:

UNKNOWN value of StorageDirId