org.apache.cassandra.utils

Class FBUtilities

java.lang.Object

org.apache.cassandra.utils.FBUtilities

public class FBUtilities
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_UNSIGNED_SHORT
static java.math.BigInteger	TWO

Constructor Summary

Constructors

Constructor and Description
FBUtilities()

Method Summary

Methods

Modifier and Type	Method and Description
static long	abs(long index)
static java.io.File	cassandraTriggerDir()
static <T> java.lang.Class<T>	classForName(java.lang.String classname, java.lang.String readable)
static <T> CloseableIterator<T>	closeableIterator(java.util.Iterator<T> iterator)
static int	compareUnsigned(byte[] bytes1, byte[] bytes2)
static int	compareUnsigned(byte[] bytes1, byte[] bytes2, int offset1, int offset2, int len1, int len2)
static <T> T	construct(java.lang.String classname, java.lang.String readable) Constructs an instance of the given class, which must have a no-arg or default constructor.
static long	copy(java.io.InputStream from, java.io.OutputStream to, long limit)
static void	exec(java.lang.ProcessBuilder pb) Starts and waits for the given @param pb to finish.
static java.util.List<java.lang.String>	fromJsonList(java.lang.String json)
static java.util.Map<java.lang.String,java.lang.String>	fromJsonMap(java.lang.String json)
static java.util.Collection<java.net.InetAddress>	getAllLocalAddresses()
static int	getAvailableProcessors()
static java.net.InetAddress	getBroadcastAddress()
static java.net.InetAddress	getLocalAddress() Please use getBroadcastAddress instead.
static java.lang.reflect.Field	getProtectedField(java.lang.Class klass, java.lang.String fieldName) Used to get access to protected/private field of the specified class
static java.lang.String	getReleaseVersionString()
static java.io.File	getToolsOutputDirectory()
static byte[]	hash(java.nio.ByteBuffer... data)
static java.math.BigInteger	hashToBigInteger(java.nio.ByteBuffer data)
static boolean	hasProcFS()
static boolean	isWindows()
static java.lang.String	json(java.lang.Object object)
static Pair<java.math.BigInteger,java.lang.Boolean>	midpoint(java.math.BigInteger left, java.math.BigInteger right, int sigbits) Given two bit arrays represented as BigIntegers, containing the given number of significant bits, calculate a midpoint.
static IAuthenticator	newAuthenticator(java.lang.String className)
static IAuthorizer	newAuthorizer(java.lang.String className)
static java.security.MessageDigest	newMessageDigest(java.lang.String algorithm)
static IAllocator	newOffHeapAllocator(java.lang.String offheap_allocator)
static IPartitioner	newPartitioner(java.lang.String partitionerClassName)
static java.lang.String	prettyPrintMemory(long size)
static java.lang.String	resourceToFile(java.lang.String filename)
static <T> byte[]	serialize(T object, IVersionedSerializer<T> serializer, int version)
static <T> java.util.SortedSet<T>	singleton(T column, java.util.Comparator<? super T> comparator)
static void	sortSampledKeys(java.util.List<DecoratedKey> keys, Range<Token> range)
static java.security.MessageDigest	threadLocalMD5Digest()
static long	timestampMicros()
static java.lang.String	toString(java.util.Map<?,?> map) Make straing out of the given Map.
static byte[]	toWriteUTFBytes(java.lang.String s)
static void	updateChecksumInt(java.util.zip.Checksum checksum, int v)
static void	updateWithByte(java.security.MessageDigest digest, int val)
static void	updateWithInt(java.security.MessageDigest digest, int val)
static void	updateWithLong(java.security.MessageDigest digest, long val)
static void	updateWithShort(java.security.MessageDigest digest, int val)
static <T> T	waitOnFuture(java.util.concurrent.Future<T> future)
static <T> java.util.List<T>	waitOnFutures(java.lang.Iterable<? extends java.util.concurrent.Future<? extends T>> futures)
static void	waitOnFutures(java.util.List<AsyncOneResponse> results, long ms)
static byte[]	xor(byte[] left, byte[] right)

Methods inherited from class java.lang.Object

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

Field Detail

TWO

public static final java.math.BigInteger TWO

MAX_UNSIGNED_SHORT

public static final int MAX_UNSIGNED_SHORT

See Also:

Constant Field Values

Constructor Detail

FBUtilities

public FBUtilities()

Method Detail

getAvailableProcessors

public static int getAvailableProcessors()

threadLocalMD5Digest

public static java.security.MessageDigest threadLocalMD5Digest()

newMessageDigest

public static java.security.MessageDigest newMessageDigest(java.lang.String algorithm)

getLocalAddress

public static java.net.InetAddress getLocalAddress()

Please use getBroadcastAddress instead. You need this only when you have to listen/connect.

getBroadcastAddress

public static java.net.InetAddress getBroadcastAddress()

getAllLocalAddresses

public static java.util.Collection<java.net.InetAddress> getAllLocalAddresses()

midpoint

public static Pair<java.math.BigInteger,java.lang.Boolean> midpoint(java.math.BigInteger left,
                                                    java.math.BigInteger right,
                                                    int sigbits)

Given two bit arrays represented as BigIntegers, containing the given number of significant bits, calculate a midpoint.

Parameters:

left - The left point.

right - The right point.

sigbits - The number of bits in the points that are significant.

Returns:

A midpoint that will compare bitwise halfway between the params, and a boolean representing whether a non-zero lsbit remainder was generated.

compareUnsigned

public static int compareUnsigned(byte[] bytes1,
                  byte[] bytes2,
                  int offset1,
                  int offset2,
                  int len1,
                  int len2)

compareUnsigned

public static int compareUnsigned(byte[] bytes1,
                  byte[] bytes2)

xor

public static byte[] xor(byte[] left,
         byte[] right)

Returns:

The bitwise XOR of the inputs. The output will be the same length as the longer input, but if either input is null, the output will be null.

hash

public static byte[] hash(java.nio.ByteBuffer... data)

hashToBigInteger

public static java.math.BigInteger hashToBigInteger(java.nio.ByteBuffer data)

sortSampledKeys

public static void sortSampledKeys(java.util.List<DecoratedKey> keys,
                   Range<Token> range)

resourceToFile

public static java.lang.String resourceToFile(java.lang.String filename)
                                       throws ConfigurationException

Throws:

ConfigurationException

cassandraTriggerDir

public static java.io.File cassandraTriggerDir()

getReleaseVersionString

public static java.lang.String getReleaseVersionString()

timestampMicros

public static long timestampMicros()

waitOnFutures

public static <T> java.util.List<T> waitOnFutures(java.lang.Iterable<? extends java.util.concurrent.Future<? extends T>> futures)

waitOnFuture

public static <T> T waitOnFuture(java.util.concurrent.Future<T> future)

waitOnFutures

public static void waitOnFutures(java.util.List<AsyncOneResponse> results,
                 long ms)
                          throws java.util.concurrent.TimeoutException

Throws:

java.util.concurrent.TimeoutException

newPartitioner

public static IPartitioner newPartitioner(java.lang.String partitionerClassName)
                                   throws ConfigurationException

Throws:

ConfigurationException

newOffHeapAllocator

public static IAllocator newOffHeapAllocator(java.lang.String offheap_allocator)
                                      throws ConfigurationException

Throws:

ConfigurationException

newAuthorizer

public static IAuthorizer newAuthorizer(java.lang.String className)
                                 throws ConfigurationException

Throws:

ConfigurationException

newAuthenticator

public static IAuthenticator newAuthenticator(java.lang.String className)
                                       throws ConfigurationException

Throws:

ConfigurationException

classForName

public static <T> java.lang.Class<T> classForName(java.lang.String classname,
                                  java.lang.String readable)
                                       throws ConfigurationException

Parameters:

classname - Fully qualified classname.

readable - Descriptive noun for the role the class plays.

Returns:

The Class for the given name.

Throws:

ConfigurationException - If the class cannot be found.

construct

public static <T> T construct(java.lang.String classname,
              java.lang.String readable)
                   throws ConfigurationException

Constructs an instance of the given class, which must have a no-arg or default constructor.

Parameters:

classname - Fully qualified classname.

readable - Descriptive noun for the role the class plays.

Throws:

ConfigurationException - If the class cannot be found.

singleton

public static <T> java.util.SortedSet<T> singleton(T column,
                                   java.util.Comparator<? super T> comparator)

toString

@Nonnull
public static java.lang.String toString(@Nullable
                                java.util.Map<?,?> map)

Make straing out of the given Map.

Parameters:

map - Map to make string.

Returns:

String representation of all entries in the map, where key and value pair is concatenated with ':'.

getProtectedField

public static java.lang.reflect.Field getProtectedField(java.lang.Class klass,
                                        java.lang.String fieldName)

Used to get access to protected/private field of the specified class

Parameters:

klass - - name of the class

fieldName - - name of the field

Returns:

Field or null on error

closeableIterator

public static <T> CloseableIterator<T> closeableIterator(java.util.Iterator<T> iterator)

fromJsonMap

public static java.util.Map<java.lang.String,java.lang.String> fromJsonMap(java.lang.String json)

fromJsonList

public static java.util.List<java.lang.String> fromJsonList(java.lang.String json)

json

public static java.lang.String json(java.lang.Object object)

prettyPrintMemory

public static java.lang.String prettyPrintMemory(long size)

exec

public static void exec(java.lang.ProcessBuilder pb)
                 throws java.io.IOException

Starts and waits for the given @param pb to finish.

Throws:

java.io.IOException - on non-zero exit code

updateChecksumInt

public static void updateChecksumInt(java.util.zip.Checksum checksum,
                     int v)

abs

public static long abs(long index)

serialize

public static <T> byte[] serialize(T object,
                   IVersionedSerializer<T> serializer,
                   int version)

copy

public static long copy(java.io.InputStream from,
        java.io.OutputStream to,
        long limit)
                 throws java.io.IOException

Throws:

java.io.IOException

getToolsOutputDirectory

public static java.io.File getToolsOutputDirectory()

isWindows

public static boolean isWindows()

hasProcFS

public static boolean hasProcFS()

updateWithShort

public static void updateWithShort(java.security.MessageDigest digest,
                   int val)

updateWithByte

public static void updateWithByte(java.security.MessageDigest digest,
                  int val)

updateWithInt

public static void updateWithInt(java.security.MessageDigest digest,
                 int val)

updateWithLong

public static void updateWithLong(java.security.MessageDigest digest,
                  long val)

toWriteUTFBytes

public static byte[] toWriteUTFBytes(java.lang.String s)