Package org.apache.bookkeeper.util

Class HardLink.HardLinkCGWin

java.lang.Object

org.apache.bookkeeper.util.HardLink.HardLinkCGWin

Enclosing class:

HardLink

static class HardLink.HardLinkCGWin
extends Object

Implementation of HardLinkCommandGetter class for Windows.

Note that the linkCount shell command for Windows is actually a Cygwin shell command, and depends on ${cygwin}/bin being in the Windows PATH environment variable, so stat.exe can be found.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static String[]	getLinkCountCommand
(package private) static String[]	hardLinkCommand
(package private) static String	hardLinkMultDir
(package private) static String[]	hardLinkMultPrefix
(package private) static String[]	hardLinkMultSuffix

Constructor Summary

Constructors

Constructor	Description
HardLinkCGWin()

Method Summary

Modifier and Type	Method	Description
(package private) int	getLinkMultArgLength(File fileDir, String[] fileBaseNames, File linkDir)	Calculate the total string length of the shell command resulting from execution of linkMult, plus the length of the source directory name (which will also be provided to the shell).
(package private) int	getMaxAllowedCmdArgLength()	Get the maximum allowed string length of a shell command on this OS, which is just the documented minimum guaranteed supported command length - aprx.
(package private) String[]	linkCount(File file)	Get the command string to query the hardlink count of a file.
(package private) String[]	linkMult(String[] fileBaseNames, File linkDir)	Get the command string needed to hardlink a bunch of files from a single source directory into a target directory.
(package private) String[]	linkOne(File file, File linkName)	Get the command string needed to hardlink a single file.

Methods inherited from class java.lang.Object

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

Field Details

hardLinkCommand

static String[] hardLinkCommand

hardLinkMultPrefix

static String[] hardLinkMultPrefix

hardLinkMultDir

static String hardLinkMultDir

hardLinkMultSuffix

static String[] hardLinkMultSuffix

getLinkCountCommand

static String[] getLinkCountCommand

Constructor Details

HardLinkCGWin

HardLinkCGWin()

Method Details

linkOne

String[] linkOne(File file,
 File linkName)
          throws IOException

Get the command string needed to hardlink a single file.

Throws:

IOException

linkMult

String[] linkMult(String[] fileBaseNames,
 File linkDir)
           throws IOException

Get the command string needed to hardlink a bunch of files from a single source directory into a target directory. The source directory is not specified here, but the command will be executed using the source directory as the "current working directory" of the shell invocation.

Parameters:

fileBaseNames - - array of path-less file names, relative to the source directory

linkDir - - target directory where the hardlinks will be put

Returns:

- an array of Strings suitable for use as a single shell command with Runtime.exec()

Throws:

IOException - - if any of the file or path names misbehave

linkCount

String[] linkCount(File file)
            throws IOException

Get the command string to query the hardlink count of a file.

Throws:

IOException

getLinkMultArgLength

int getLinkMultArgLength(File fileDir,
 String[] fileBaseNames,
 File linkDir)
                  throws IOException

Calculate the total string length of the shell command resulting from execution of linkMult, plus the length of the source directory name (which will also be provided to the shell).

Parameters:

fileDir - - source directory, parent of fileBaseNames

fileBaseNames - - array of path-less file names, relative to the source directory

linkDir - - target directory where the hardlinks will be put

Returns:

- total data length (must not exceed maxAllowedCmdArgLength)

Throws:

IOException

getMaxAllowedCmdArgLength

int getMaxAllowedCmdArgLength()

Get the maximum allowed string length of a shell command on this OS, which is just the documented minimum guaranteed supported command length - aprx. 32KB for Unix, and 8KB for Windows.