com.gemstone.gemfire.internal.shared.unsafe

Class UnsafeHolder

java.lang.Object

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

public abstract class UnsafeHolder
extends java.lang.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 boolean	littleEndian

Method Summary

Modifier and Type	Method and Description
static java.nio.ByteBuffer	allocateDirectBuffer(int size, FreeMemory.Factory factory)
static java.nio.ByteBuffer	allocateDirectBuffer(long address, int size, FreeMemory.Factory factory)
static void	changeDirectBufferCleaner(java.nio.ByteBuffer buffer, int size, java.lang.Class<? extends FreeMemory> from, java.lang.Class<? extends FreeMemory> to, FreeMemory.Factory factory, java.util.function.BiConsumer<java.lang.String,java.lang.Object> changeOwner) Change the runnable field of Cleaner using given factory.
static void	checkBounds(int arrayLength, int offset, int len) Checks that the range described by offset and size doesn't exceed arrayLength.
static int	getAllocationSize(int size)
static long	getDirectBufferAddress(java.nio.ByteBuffer buffer)
static sun.misc.Unsafe	getUnsafe()
static boolean	hasUnsafe()
static void	monitorEnter(java.lang.Object obj)
static void	monitorExit(java.lang.Object obj)
static InputStreamChannel	newChannelBufferFramedInputStream(java.nio.channels.ReadableByteChannel channel, int bufferSize)
static OutputStreamChannel	newChannelBufferFramedOutputStream(java.nio.channels.WritableByteChannel channel, int bufferSize)
static InputStreamChannel	newChannelBufferInputStream(java.nio.channels.ReadableByteChannel channel, int bufferSize)
static OutputStreamChannel	newChannelBufferOutputStream(java.nio.channels.WritableByteChannel channel, int bufferSize)
static java.nio.ByteBuffer	reallocateDirectBuffer(java.nio.ByteBuffer buffer, int newSize, java.lang.Class<?> expectedClass, FreeMemory.Factory factory)
static void	releaseDirectBuffer(java.nio.ByteBuffer buffer) Release explicitly assuming passed ByteBuffer is a direct one.
static void	releasePendingReferences()
static boolean	tryMonitorEnter(java.lang.Object obj, boolean checkSelf)

Methods inherited from class java.lang.Object

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

Field Detail

littleEndian

public static final boolean littleEndian

Method Detail

hasUnsafe

public static boolean hasUnsafe()

getAllocationSize

public static int getAllocationSize(int size)

allocateDirectBuffer

public static java.nio.ByteBuffer allocateDirectBuffer(int size,
                                                       FreeMemory.Factory factory)

allocateDirectBuffer

public static java.nio.ByteBuffer allocateDirectBuffer(long address,
                                                       int size,
                                                       FreeMemory.Factory factory)

getDirectBufferAddress

public static long getDirectBufferAddress(java.nio.ByteBuffer buffer)

reallocateDirectBuffer

public static java.nio.ByteBuffer reallocateDirectBuffer(java.nio.ByteBuffer buffer,
                                                         int newSize,
                                                         java.lang.Class<?> expectedClass,
                                                         FreeMemory.Factory factory)

changeDirectBufferCleaner

public static void changeDirectBufferCleaner(java.nio.ByteBuffer buffer,
                                             int size,
                                             java.lang.Class<? extends FreeMemory> from,
                                             java.lang.Class<? extends FreeMemory> to,
                                             FreeMemory.Factory factory,
                                             java.util.function.BiConsumer<java.lang.String,java.lang.Object> changeOwner)
                                      throws java.lang.IllegalAccessException

Change the runnable field of Cleaner using given factory. The "to" argument specifies that target Runnable type that factory will produce. If the existing Runnable already matches "to" then its a no-op.

The provided BiConsumer is used to apply any action before actually changing the runnable field with the boolean argument indicating whether the current field matches "from" or if it is something else.

Throws:

java.lang.IllegalAccessException

releaseDirectBuffer

public static void releaseDirectBuffer(java.nio.ByteBuffer buffer)

Release explicitly assuming passed ByteBuffer is a direct one. Avoid using this directly rather use BufferAllocator.allocate/release where possible.

releasePendingReferences

public static void releasePendingReferences()

getUnsafe

public static sun.misc.Unsafe getUnsafe()

tryMonitorEnter

public static boolean tryMonitorEnter(java.lang.Object obj,
                                      boolean checkSelf)

monitorEnter

public static void monitorEnter(java.lang.Object obj)

monitorExit

public static void monitorExit(java.lang.Object obj)

newChannelBufferInputStream

public static InputStreamChannel newChannelBufferInputStream(java.nio.channels.ReadableByteChannel channel,
                                                             int bufferSize)
                                                      throws java.io.IOException

Throws:

java.io.IOException

newChannelBufferOutputStream

public static OutputStreamChannel newChannelBufferOutputStream(java.nio.channels.WritableByteChannel channel,
                                                               int bufferSize)
                                                        throws java.io.IOException

Throws:

java.io.IOException

newChannelBufferFramedInputStream

public static InputStreamChannel newChannelBufferFramedInputStream(java.nio.channels.ReadableByteChannel channel,
                                                                   int bufferSize)
                                                            throws java.io.IOException

Throws:

java.io.IOException

newChannelBufferFramedOutputStream

public static OutputStreamChannel newChannelBufferFramedOutputStream(java.nio.channels.WritableByteChannel channel,
                                                                     int bufferSize)
                                                              throws java.io.IOException

Throws:

java.io.IOException

checkBounds

public static void checkBounds(int arrayLength,
                               int offset,
                               int len)

Checks that the range described by offset and size doesn't exceed arrayLength.