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

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	UnsafeHolder.FreeMemory
static interface	UnsafeHolder.FreeMemoryFactory

Method Summary

Modifier and Type	Method and Description
static ByteBuffer	allocateDirectBuffer(int size, UnsafeHolder.FreeMemoryFactory factory)
static void	changeDirectBufferCleaner(ByteBuffer buffer, int size, Class<? extends UnsafeHolder.FreeMemory> from, Class<? extends UnsafeHolder.FreeMemory> to, UnsafeHolder.FreeMemoryFactory factory, java.util.function.Consumer<String> 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(ByteBuffer buffer)
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)
static ByteBuffer	reallocateDirectBuffer(ByteBuffer buffer, int newSize, Class<?> expectedClass, UnsafeHolder.FreeMemoryFactory factory)
static void	releaseIfDirectBuffer(ByteBuffer buffer) Release explicitly if the passed ByteBuffer is a direct one.
static void	releasePendingReferences()

Methods inherited from class java.lang.Object

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

Method Detail

hasUnsafe

public static boolean hasUnsafe()

getAllocationSize

public static int getAllocationSize(int size)

allocateDirectBuffer

public static ByteBuffer allocateDirectBuffer(int size,
                                              UnsafeHolder.FreeMemoryFactory factory)

getDirectBufferAddress

public static long getDirectBufferAddress(ByteBuffer buffer)

reallocateDirectBuffer

public static ByteBuffer reallocateDirectBuffer(ByteBuffer buffer,
                                                int newSize,
                                                Class<?> expectedClass,
                                                UnsafeHolder.FreeMemoryFactory factory)

changeDirectBufferCleaner

public static void changeDirectBufferCleaner(ByteBuffer buffer,
                                             int size,
                                             Class<? extends UnsafeHolder.FreeMemory> from,
                                             Class<? extends UnsafeHolder.FreeMemory> to,
                                             UnsafeHolder.FreeMemoryFactory factory,
                                             java.util.function.Consumer<String> changeOwner)
                                      throws 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 Consumer 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:

IllegalAccessException

releaseIfDirectBuffer

public static void releaseIfDirectBuffer(ByteBuffer buffer)

Release explicitly if the 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()

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

checkBounds

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

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