alluxio.fuse

Class AlluxioFuseUtils

java.lang.Object

alluxio.fuse.AlluxioFuseUtils

@ThreadSafe
public final class AlluxioFuseUtils
extends Object

Utility methods for Alluxio-FUSE.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	AlluxioFuseUtils.FuseCallable An interface representing a callable for FUSE APIs.

Method Summary

Modifier and Type	Method and Description
static int	call(org.slf4j.Logger logger, AlluxioFuseUtils.FuseCallable callable, String methodName, String description, Object... args) Calls the given AlluxioFuseUtils.FuseCallable and returns its result.
static int	getErrorCode(Throwable t) Gets the corresponding error code of a throwable.
static long	getGid(String userName) Retrieves the primary gid of the given user.
static long	getGidFromGroupName(String groupName) Retrieves the gid of the given group.
static String	getGroupName(long gid) Gets the group name from the group id.
static String	getGroupName(String userName) Gets the primary group name from the user name.
static long	getUid(String userName) Retrieves the uid of the given user.
static String	getUserName(long uid) Gets the user name from the user id.
static boolean	isFuseInstalled() Checks whether fuse is installed in local file system.
static boolean	waitForFileCompleted(FileSystem fileSystem, AlluxioURI uri) Waits for the file to complete.

Methods inherited from class java.lang.Object

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

Method Detail

getUid

public static long getUid(String userName)

Retrieves the uid of the given user.

Parameters:

userName - the user name

Returns:

uid or -1 on failures

getGid

public static long getGid(String userName)

Retrieves the primary gid of the given user.

Parameters:

userName - the user name

Returns:

gid or -1 on failures

getGidFromGroupName

public static long getGidFromGroupName(String groupName)

Retrieves the gid of the given group.

Parameters:

groupName - the group name

Returns:

gid or -1 on failures

getUserName

public static String getUserName(long uid)
                          throws IOException

Gets the user name from the user id.

Parameters:

uid - user id

Returns:

user name

Throws:

IOException

getGroupName

public static String getGroupName(String userName)
                           throws IOException

Gets the primary group name from the user name.

Parameters:

userName - the user name

Returns:

group name

Throws:

IOException

getGroupName

public static String getGroupName(long gid)
                           throws IOException

Gets the group name from the group id.

Parameters:

gid - the group id

Returns:

group name

Throws:

IOException

isFuseInstalled

public static boolean isFuseInstalled()

Checks whether fuse is installed in local file system. Alluxio-Fuse only support mac and linux.

Returns:

true if fuse is installed, false otherwise

getErrorCode

public static int getErrorCode(Throwable t)

Gets the corresponding error code of a throwable.

Parameters:

t - throwable

Returns:

the corresponding error code

waitForFileCompleted

public static boolean waitForFileCompleted(FileSystem fileSystem,
                                           AlluxioURI uri)

Waits for the file to complete. This method is mainly added to make sure the async release() when writing a file finished before getting status of the file or opening the file for read().

Parameters:

fileSystem - the file system to get file status

uri - the file path to check

Returns:

whether the file is completed or not

call

public static int call(org.slf4j.Logger logger,
                       AlluxioFuseUtils.FuseCallable callable,
                       String methodName,
                       String description,
                       Object... args)

Calls the given AlluxioFuseUtils.FuseCallable and returns its result.

Parameters:

logger - the logger to use for this call

callable - the callable to call

methodName - the name of the method, used for metrics

description - the format string of the description, used for logging

args - the arguments for the description

Returns:

the result