com.oracle.svm.core.containers

Interface CgroupSubsystemController

All Known Implementing Classes:

CgroupV1MemorySubSystemController, CgroupV1SubsystemController, CgroupV2SubsystemController

public interface CgroupSubsystemController

Cgroup version agnostic controller logic

Field Summary

Fields

Modifier and Type	Field and Description
static String	EMPTY_STR

Method Summary

Modifier and Type	Method and Description
static long	convertStringToLong(String strval, long overflowRetval, long defaultRetval) Convert a number from its string representation to a long.
static double	getDoubleValue(CgroupSubsystemController controller, String param, double defaultRetval) Get a double value from file "param" within "controller".
static long	getLongEntry(CgroupSubsystemController controller, String param, String entryname, long defaultRetval) getLongEntry Return the long value from the line containing the string "entryname" within file "param" in the "controller".
static long	getLongValue(CgroupSubsystemController controller, String param, Function<String,Long> conversion, long defaultRetval) Get a long value from directory "controller" and file "param", by applying "conversion" to the string value within the file.
static long	getLongValueMatchingLine(CgroupSubsystemController controller, String param, String match, Function<String,Long> conversion, long defaultRetval) Get an entry from file "param" within the "controller" directory path which matches string "match".
static String	getStringValue(CgroupSubsystemController controller, String param) getStringValue Return the first line of the file "param" argument from the controller.
String	path()
static int[]	stringRangeToIntArray(String range) stringRangeToIntArray Convert a string in the form of 1,3-4,6 to an array of integers containing all the numbers in the range.

Field Detail

EMPTY_STR

static final String EMPTY_STR

See Also:

Constant Field Values

Method Detail

path

String path()

getStringValue

static String getStringValue(CgroupSubsystemController controller,
                             String param)

getStringValue Return the first line of the file "param" argument from the controller. TODO: Consider using weak references for caching BufferedReader object.

Parameters:

controller -

param -

Returns:

Returns the contents of the file specified by param or null if an error occurs.

getLongValueMatchingLine

static long getLongValueMatchingLine(CgroupSubsystemController controller,
                                     String param,
                                     String match,
                                     Function<String,Long> conversion,
                                     long defaultRetval)

Get an entry from file "param" within the "controller" directory path which matches string "match". Applies "conversion" to the matching line.

Parameters:

controller -

param -

match -

conversion -

defaultRetval -

Returns:

The long value as derived by applying "conversion" to the matching line or "defaultRetval" if there was an error or no match found.

getLongValue

static long getLongValue(CgroupSubsystemController controller,
                         String param,
                         Function<String,Long> conversion,
                         long defaultRetval)

Get a long value from directory "controller" and file "param", by applying "conversion" to the string value within the file.

Parameters:

controller -

param -

conversion -

defaultRetval -

Returns:

The converted long value or "defaultRetval" if there was an error.

getDoubleValue

static double getDoubleValue(CgroupSubsystemController controller,
                             String param,
                             double defaultRetval)

Get a double value from file "param" within "controller".

Parameters:

controller -

param -

defaultRetval -

Returns:

The double value or "defaultRetval" if there was an error.

getLongEntry

static long getLongEntry(CgroupSubsystemController controller,
                         String param,
                         String entryname,
                         long defaultRetval)

getLongEntry Return the long value from the line containing the string "entryname" within file "param" in the "controller". TODO: Consider using weak references for caching BufferedReader object.

Parameters:

controller -

param -

entryname -

Returns:

long value or "defaultRetval" if there was an error or no match was found.

stringRangeToIntArray

static int[] stringRangeToIntArray(String range)

stringRangeToIntArray Convert a string in the form of 1,3-4,6 to an array of integers containing all the numbers in the range.

Parameters:

range -

Returns:

int[] containing a sorted list of numbers as represented by the string range. Returns null if there was an error or the input was an empty string.

convertStringToLong

static long convertStringToLong(String strval,
                                long overflowRetval,
                                long defaultRetval)

Convert a number from its string representation to a long.

Parameters:

strval -

overflowRetval -

defaultRetval -

Returns:

The converted long value. "overflowRetval" is returned if the string representation exceeds the range of type long. "defaultRetval" is returned if another type of error occurred during conversion.