io.netty.util.internal

Class PlatformDependent

java.lang.Object

io.netty.util.internal.PlatformDependent

public final class PlatformDependent
extends Object

Utility that detects various properties specific to the current runtime environment, such as Java version and the availability of the sun.misc.Unsafe object.

You can disable the use of sun.misc.Unsafe if you specify the system property io.netty.noUnsafe.

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	canEnableTcpNoDelayByDefault() Returns true if and only if it is fine to enable TCP_NODELAY socket option by default.
static boolean	canFreeDirectBuffer() Return true if direct buffers can be freed using an optimized way and so memory footprint will be very small.
static void	copyMemory(byte[] src, int srcIndex, long dstAddr, long length)
static void	copyMemory(long srcAddr, byte[] dst, int dstIndex, long length)
static void	copyMemory(long srcAddr, long dstAddr, long length)
static long	directBufferAddress(ByteBuffer buffer)
static void	freeDirectBuffer(ByteBuffer buffer) Try to deallocate the specified direct ByteBuffer.
static byte	getByte(long address)
static int	getInt(long address)
static long	getLong(long address)
static Object	getObject(Object object, long fieldOffset)
static short	getShort(long address)
static boolean	hasJavassist() Returns true if and only if Javassist is available.
static boolean	hasUnsafe() Return true if sun.misc.Unsafe was found on the classpath and can be used.
static boolean	isAndroid() Returns true if and only if the current platform is Android
static boolean	isRoot() Return true if the current user is root.
static boolean	isUnaligned() Returns true if and only if java.nio.Bits.unaligned() is true.
static boolean	isWindows() Return true if the JVM is running on Windows
static int	javaVersion() Return the version of Java under which this library is used.
static long	objectFieldOffset(Field field)
static void	putByte(long address, byte value)
static void	putInt(long address, int value)
static void	putLong(long address, long value)
static void	putShort(long address, short value)

Methods inherited from class java.lang.Object

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

Method Detail

isAndroid

public static boolean isAndroid()

Returns true if and only if the current platform is Android

isWindows

public static boolean isWindows()

Return true if the JVM is running on Windows

isRoot

public static boolean isRoot()

Return true if the current user is root. Note that this method returns false if on Windows.

javaVersion

public static int javaVersion()

Return the version of Java under which this library is used.

canEnableTcpNoDelayByDefault

public static boolean canEnableTcpNoDelayByDefault()

Returns true if and only if it is fine to enable TCP_NODELAY socket option by default.

hasUnsafe

public static boolean hasUnsafe()

Return true if sun.misc.Unsafe was found on the classpath and can be used.

canFreeDirectBuffer

public static boolean canFreeDirectBuffer()

Return true if direct buffers can be freed using an optimized way and so memory footprint will be very small.

isUnaligned

public static boolean isUnaligned()

Returns true if and only if java.nio.Bits.unaligned() is true.

hasJavassist

public static boolean hasJavassist()

Returns true if and only if Javassist is available.

directBufferAddress

public static long directBufferAddress(ByteBuffer buffer)

freeDirectBuffer

public static void freeDirectBuffer(ByteBuffer buffer)

Try to deallocate the specified direct ByteBuffer. Please note this method does nothing if the current platform does not support this operation or the specified buffer is not a direct buffer.

getObject

public static Object getObject(Object object,
               long fieldOffset)

objectFieldOffset

public static long objectFieldOffset(Field field)

getByte

public static byte getByte(long address)

getShort

public static short getShort(long address)

getInt

public static int getInt(long address)

getLong

public static long getLong(long address)

putByte

public static void putByte(long address,
           byte value)

putShort

public static void putShort(long address,
            short value)

putInt

public static void putInt(long address,
          int value)

putLong

public static void putLong(long address,
           long value)

copyMemory

public static void copyMemory(long srcAddr,
              long dstAddr,
              long length)

copyMemory

public static void copyMemory(byte[] src,
              int srcIndex,
              long dstAddr,
              long length)

copyMemory

public static void copyMemory(long srcAddr,
              byte[] dst,
              int dstIndex,
              long length)