com.day.io.disk

Class DiskSpaceUtil

java.lang.Object

com.day.io.disk.DiskSpaceUtil

public class DiskSpaceUtil
extends Object

An utility class to measure the free disk space and the current ulimit. To measure the disk space, it uses the Java 6 method File.getUsableSpace if available, or the command "df" (Unix) or "dir" (Windows). To check the ulimit (Unix only), it runs the command "ulimit -n".

Field Summary

Fields

Modifier and Type	Field and Description
static String	COMMAND_DISK_SPACE If this system property is set, this command line is used to measure the free disk space.
static String	COMMAND_ULIMIT If this system property is set, this command line is used to measure the ulimit.
static String	INTERVAL The maximum measure interval in milliseconds.

Constructor Summary

Constructors

Constructor and Description
DiskSpaceUtil()

Method Summary

Methods

Modifier and Type	Method and Description
long	getAvailableDiskSpaceMB() Get the available disk space in megabytes for the current working directory using the default interval.
long	getAvailableDiskSpaceMB(File dir) Get the available disk space in megabytes for the given directory using the default interval.
long	getAvailableDiskSpaceMB(File dir, long interval) Get the available disk space in megabytes for the given directory and using the given interval.
long	getDefaultMeasureInterval()
static DiskSpaceUtil	getInstance() Get the instance.
int	getMaxOpenFiles() Get the maximum number of open files for this process.

Methods inherited from class java.lang.Object

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

Field Detail

COMMAND_DISK_SPACE

public static final String COMMAND_DISK_SPACE

If this system property is set, this command line is used to measure the free disk space.

See Also:

Constant Field Values

COMMAND_ULIMIT

public static final String COMMAND_ULIMIT

If this system property is set, this command line is used to measure the ulimit.

See Also:

Constant Field Values

INTERVAL

public static final String INTERVAL

The maximum measure interval in milliseconds. The default value 60000 means measure once a minute. If -1, disk space is never measured.

See Also:

Constant Field Values

Constructor Detail

DiskSpaceUtil

public DiskSpaceUtil()

Method Detail

getInstance

public static DiskSpaceUtil getInstance()

Get the instance.

Returns:

the instance

getMaxOpenFiles

public int getMaxOpenFiles()

Get the maximum number of open files for this process. Under Linux it uses the command "ulimit". When running in Windows, the value Integer.MAX_VALUE is returned.

Returns:

the maximum number of open files, or Integer.MAX_VALUE

getAvailableDiskSpaceMB

public long getAvailableDiskSpaceMB()

Get the available disk space in megabytes for the current working directory using the default interval.

Returns:

the space or -1 if it can't be measured

getAvailableDiskSpaceMB

public long getAvailableDiskSpaceMB(File dir)

Get the available disk space in megabytes for the given directory using the default interval.

Parameters:

dir - the directory

Returns:

the space or -1 if it can't be measured

getAvailableDiskSpaceMB

public long getAvailableDiskSpaceMB(File dir,
                           long interval)

Get the available disk space in megabytes for the given directory and using the given interval.

Parameters:

dir - the directory

interval - the interval in milliseconds

Returns:

the space in megabytes or -1 if it can't be measured; Integer.MAX_VALUE if the interval is smaller than 0

getDefaultMeasureInterval

public long getDefaultMeasureInterval()