com.gemstone.gemfire.internal.shared.unsafe

Class UnsafeHolder

java.lang.Object

com.gemstone.gemfire.internal.shared.unsafe.UnsafeHolder

public abstract class UnsafeHolder
extends Object

Holder for static sun.misc.Unsafe instance and some convenience methods. Use other methods only if hasUnsafe() returns true;

Since:

gfxd 1.1

Field Summary

Fields

Modifier and Type	Field and Description
static long	arrayBaseOffset

Method Summary

Methods

Modifier and Type	Method and Description
static void	bufferGet(byte[] dst, long address, int offset, int length, sun.misc.Unsafe unsafe)
static void	bufferPut(byte[] src, long address, int offset, int length, sun.misc.Unsafe unsafe)
static boolean	checkBounds(int off, int len, int size)
static void	copyMemory(Object src, long srcOffset, Object dst, long dstOffset, long length, sun.misc.Unsafe unsafe) Copy from given source object to destination object.
static Method	getDirectByteBufferAddressMethod()
static sun.misc.Unsafe	getUnsafe()
static boolean	hasUnsafe()
static InputStreamChannel	newChannelBufferFramedInputStream(ReadableByteChannel channel, int bufferSize)
static OutputStreamChannel	newChannelBufferFramedOutputStream(WritableByteChannel channel, int bufferSize)
static InputStreamChannel	newChannelBufferInputStream(ReadableByteChannel channel, int bufferSize)
static OutputStreamChannel	newChannelBufferOutputStream(WritableByteChannel channel, int bufferSize)

Methods inherited from class java.lang.Object

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

Field Detail

arrayBaseOffset

public static final long arrayBaseOffset

Method Detail

hasUnsafe

public static boolean hasUnsafe()

getDirectByteBufferAddressMethod

public static Method getDirectByteBufferAddressMethod()

getUnsafe

public static sun.misc.Unsafe getUnsafe()

newChannelBufferInputStream

public static InputStreamChannel newChannelBufferInputStream(ReadableByteChannel channel,
                                             int bufferSize)
                                                      throws IOException

Throws:

IOException

newChannelBufferOutputStream

public static OutputStreamChannel newChannelBufferOutputStream(WritableByteChannel channel,
                                               int bufferSize)
                                                        throws IOException

Throws:

IOException

newChannelBufferFramedInputStream

public static InputStreamChannel newChannelBufferFramedInputStream(ReadableByteChannel channel,
                                                   int bufferSize)
                                                            throws IOException

Throws:

IOException

newChannelBufferFramedOutputStream

public static OutputStreamChannel newChannelBufferFramedOutputStream(WritableByteChannel channel,
                                                     int bufferSize)
                                                              throws IOException

Throws:

IOException

copyMemory

public static void copyMemory(Object src,
              long srcOffset,
              Object dst,
              long dstOffset,
              long length,
              sun.misc.Unsafe unsafe)

Copy from given source object to destination object.

Parameters:

src - source object; can be null in which case the srcOffset must be a memory address

srcOffset - offset in source object to start copy

dst - destination object; can be null in which case the dstOffset must be a memory address

dstOffset - destination address

length - number of bytes to copy

checkBounds

public static boolean checkBounds(int off,
                  int len,
                  int size)

bufferGet

public static void bufferGet(byte[] dst,
             long address,
             int offset,
             int length,
             sun.misc.Unsafe unsafe)

See Also:

ByteBuffer.get(byte[], int, int)

bufferPut

public static void bufferPut(byte[] src,
             long address,
             int offset,
             int length,
             sun.misc.Unsafe unsafe)

See Also:

ByteBuffer.put(byte[], int, int)