Package org.apache.bookkeeper.util
Class HardLink.HardLinkCGUnix
- java.lang.Object
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- org.apache.bookkeeper.util.HardLink.HardLinkCGUnix
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- Enclosing class:
- HardLink
static class HardLink.HardLinkCGUnix extends java.lang.Object
Implementation of HardLinkCommandGetter class for Unix.
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Constructor Summary
Constructors Constructor Description HardLinkCGUnix()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description (package private) int
getLinkMultArgLength(java.io.File fileDir, java.lang.String[] fileBaseNames, java.io.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) java.lang.String[]
linkCount(java.io.File file)
Get the command string to query the hardlink count of a file.(package private) java.lang.String[]
linkMult(java.lang.String[] fileBaseNames, java.io.File linkDir)
Get the command string needed to hardlink a bunch of files from a single source directory into a target directory.(package private) java.lang.String[]
linkOne(java.io.File file, java.io.File linkName)
Get the command string needed to hardlink a single file.
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Method Detail
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linkOne
java.lang.String[] linkOne(java.io.File file, java.io.File linkName) throws java.io.IOException
Get the command string needed to hardlink a single file.- Throws:
java.io.IOException
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linkMult
java.lang.String[] linkMult(java.lang.String[] fileBaseNames, java.io.File linkDir) throws java.io.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 directorylinkDir
- - 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:
java.io.IOException
- - if any of the file or path names misbehave
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linkCount
java.lang.String[] linkCount(java.io.File file) throws java.io.IOException
Get the command string to query the hardlink count of a file.- Throws:
java.io.IOException
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getLinkMultArgLength
int getLinkMultArgLength(java.io.File fileDir, java.lang.String[] fileBaseNames, java.io.File linkDir) throws java.io.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 fileBaseNamesfileBaseNames
- - array of path-less file names, relative to the source directorylinkDir
- - target directory where the hardlinks will be put- Returns:
- - total data length (must not exceed maxAllowedCmdArgLength)
- Throws:
java.io.IOException
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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.
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