Package one.microstream.memory

Class XMemory

  • public final class XMemory
extends Object
    Util class for low-level VM memory operations and information that makes the call site independent of a certain JVM implementation (e.g. java.misc.Unsafe).

    • Constructor Detail

      • XMemory

        public XMemory()

    • Method Detail

      • getSystemInstance

        public static final Object getSystemInstance()

      • objectFieldOffset

        public static long objectFieldOffset​(Field field)

      • objectFieldOffsets

        public static long[] objectFieldOffsets​(Field[] fields)

      • getStaticReference

        public static final Object getStaticReference​(Field field)

      • bitSize_byte

        public static final int bitSize_byte()

      • bitSize_boolean

        public static final int bitSize_boolean()

      • bitSize_short

        public static final int bitSize_short()

      • bitSize_char

        public static final int bitSize_char()

      • bitSize_int

        public static final int bitSize_int()

      • bitSize_float

        public static final int bitSize_float()

      • bitSize_long

        public static final int bitSize_long()

      • bitSize_double

        public static final int bitSize_double()

      • byteSizeFieldValue

        public static final int byteSizeFieldValue​(Class<?> type)

      • byteSizePrimitive

        public static final int byteSizePrimitive​(Class<?> type)

      • byteSize_byte

        public static final int byteSize_byte()

      • byteSize_boolean

        public static final int byteSize_boolean()

      • byteSize_short

        public static final int byteSize_short()

      • byteSize_char

        public static final int byteSize_char()

      • byteSize_int

        public static final int byteSize_int()

      • byteSize_float

        public static final int byteSize_float()

      • byteSize_long

        public static final int byteSize_long()

      • byteSize_double

        public static final int byteSize_double()

      • byteSizeObjectHeader

        public static final int byteSizeObjectHeader()

      • byteSizeReference

        public static final int byteSizeReference()

      • byteSizeArray_byte

        public static final long byteSizeArray_byte​(long elementCount)

      • byteSizeArray_boolean

        public static final long byteSizeArray_boolean​(long elementCount)

      • byteSizeArray_short

        public static final long byteSizeArray_short​(long elementCount)

      • byteSizeArray_char

        public static final long byteSizeArray_char​(long elementCount)

      • byteSizeArray_int

        public static final long byteSizeArray_int​(long elementCount)

      • byteSizeArray_float

        public static final long byteSizeArray_float​(long elementCount)

      • byteSizeArray_long

        public static final long byteSizeArray_long​(long elementCount)

      • byteSizeArray_double

        public static final long byteSizeArray_double​(long elementCount)

      • byteSizeArrayObject

        public static final long byteSizeArrayObject​(long elementCount)

      • byteSizeInstance

        public static final int byteSizeInstance​(Class<?> type)

      • alignAddress

        public static final long alignAddress​(long address)

      • collectPrimitiveFieldsByByteSize

        public static Field[] collectPrimitiveFieldsByByteSize​(Field[] fields,
                                                       int byteSize)

      • calculatePrimitivesLength

        public static int calculatePrimitivesLength​(Field[] primFields)

      • getStaticFieldBase

        public static Object getStaticFieldBase​(Field field)

      • staticFieldOffsets

        public static long[] staticFieldOffsets​(Field[] fields)

      • asByteArray

        public static byte[] asByteArray​(long[] longArray)

      • asByteArray

        public static byte[] asByteArray​(long value)

      • defaultBufferSize

        public static int defaultBufferSize()
        Arbitrary value that coincidently matches most hardware's page sizes without being hard-tied to Unsafe#pageSize. So this value is an educated guess and most of the time (almost always) a "good" value when paged-sized-ish buffer sizes are needed, while still not being at the mercy of an OS's JVM implementation.
        Returns:
        a "good" value for a paged-sized-ish default buffer size.

      • pageSize

        public static int pageSize()
        Returns the system's memory "page size" (whatever that may be exactely for a given system). Use with care (and the dependency to a system value in mind!).
        Returns:
        the system's memory "page size".

      • put_byte

        public static void put_byte​(byte[] bytes,
                            int index,
                            short value)

      • put_boolean

        public static void put_boolean​(byte[] bytes,
                               int index,
                               char value)

      • put_short

        public static void put_short​(byte[] bytes,
                             int index,
                             short value)

      • put_char

        public static void put_char​(byte[] bytes,
                            int index,
                            char value)

      • put_int

        public static void put_int​(byte[] bytes,
                           int index,
                           int value)

      • put_float

        public static void put_float​(byte[] bytes,
                             int index,
                             float value)

      • put_long

        public static void put_long​(byte[] bytes,
                            int index,
                            long value)

      • put_double

        public static void put_double​(byte[] bytes,
                              int index,
                              double value)

      • _longInByteArray

        public static void _longInByteArray​(byte[] bytes,
                                    long value)

      • _longFromByteArray

        public static long _longFromByteArray​(byte[] bytes)

      • get_byte

        public static final byte get_byte​(long address)

      • get_boolean

        public static final boolean get_boolean​(long address)

      • get_short

        public static final short get_short​(long address)

      • get_char

        public static final char get_char​(long address)

      • get_int

        public static final int get_int​(long address)

      • get_float

        public static final float get_float​(long address)

      • get_long

        public static final long get_long​(long address)

      • get_double

        public static final double get_double​(long address)

      • getObject

        public static final Object getObject​(long address)

      • get_byte

        public static final byte get_byte​(Object instance,
                                  long address)

      • get_boolean

        public static final boolean get_boolean​(Object instance,
                                        long address)

      • get_short

        public static final short get_short​(Object instance,
                                    long address)

      • get_char

        public static final char get_char​(Object instance,
                                  long address)

      • get_int

        public static final int get_int​(Object instance,
                                long address)

      • get_float

        public static final float get_float​(Object instance,
                                    long address)

      • get_long

        public static final long get_long​(Object instance,
                                  long address)

      • get_double

        public static final double get_double​(Object instance,
                                      long address)

      • getObject

        public static final Object getObject​(Object instance,
                                     long address)

      • set_byte

        public static final void set_byte​(long address,
                                  byte value)

      • set_boolean

        public static final void set_boolean​(long address,
                                     boolean value)

      • set_short

        public static final void set_short​(long address,
                                   short value)

      • set_char

        public static final void set_char​(long address,
                                  char value)

      • set_int

        public static final void set_int​(long address,
                                 int value)

      • set_float

        public static final void set_float​(long address,
                                   float value)

      • set_long

        public static final void set_long​(long address,
                                  long value)

      • set_double

        public static final void set_double​(long address,
                                    double value)

      • set_byte

        public static final void set_byte​(Object instance,
                                  long offset,
                                  byte value)

      • set_boolean

        public static final void set_boolean​(Object instance,
                                     long offset,
                                     boolean value)

      • set_short

        public static final void set_short​(Object instance,
                                   long offset,
                                   short value)

      • set_char

        public static final void set_char​(Object instance,
                                  long offset,
                                  char value)

      • set_int

        public static final void set_int​(Object instance,
                                 long offset,
                                 int value)

      • set_float

        public static final void set_float​(Object instance,
                                   long offset,
                                   float value)

      • set_long

        public static final void set_long​(Object instance,
                                  long offset,
                                  long value)

      • set_double

        public static final void set_double​(Object instance,
                                    long offset,
                                    double value)

      • setObject

        public static final void setObject​(Object instance,
                                   long offset,
                                   Object value)

      • copyRange

        public static final void copyRange​(long sourceAddress,
                                   long targetAddress,
                                   long length)

      • copyRange

        public static final void copyRange​(Object source,
                                   long sourceOffset,
                                   Object target,
                                   long targetOffset,
                                   long length)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          byte[] target)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          byte[] target,
                                          int targetIndex,
                                          long length)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          boolean[] target)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          short[] target)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          char[] target)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          char[] target,
                                          int targetIndex,
                                          long targetLength)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          int[] target)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          float[] target)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          long[] target)

      • copyRangeToArray

        public static final void copyRangeToArray​(long sourceAddress,
                                          double[] target)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(byte[] array,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(byte[] array,
                                            int offset,
                                            int length,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(boolean[] array,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(boolean[] array,
                                            int offset,
                                            int length,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(short[] array,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(short[] array,
                                            int offset,
                                            int length,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(char[] array,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(char[] array,
                                            int offset,
                                            int length,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(int[] array,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(int[] array,
                                            int offset,
                                            int length,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(float[] array,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(float[] array,
                                            int offset,
                                            int length,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(long[] array,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(long[] array,
                                            int offset,
                                            int length,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(double[] array,
                                            long targetAddress)

      • copyArrayToAddress

        public static final void copyArrayToAddress​(double[] array,
                                            int offset,
                                            int length,
                                            long targetAddress)

      • get_byteFromBytes

        public static final byte get_byteFromBytes​(byte[] data,
                                           int offset)

      • get_booleanFromBytes

        public static final boolean get_booleanFromBytes​(byte[] data,
                                                 int offset)

      • get_shortFromBytes

        public static final short get_shortFromBytes​(byte[] data,
                                             int offset)

      • get_charFromBytes

        public static final char get_charFromBytes​(byte[] data,
                                           int offset)

      • get_intFromBytes

        public static final int get_intFromBytes​(byte[] data,
                                         int offset)

      • get_floatFromBytes

        public static final float get_floatFromBytes​(byte[] data,
                                             int offset)

      • get_longFromBytes

        public static final long get_longFromBytes​(byte[] data,
                                           int offset)

      • get_doubleFromBytes

        public static final double get_doubleFromBytes​(byte[] data,
                                               int offset)

      • allocate

        public static final long allocate​(long bytes)

      • reallocate

        public static final long reallocate​(long address,
                                    long bytes)

      • fillRange

        public static final void fillRange​(long address,
                                   long length,
                                   byte value)

      • free

        public static final void free​(long address)

      • compareAndSwap_int

        public static final boolean compareAndSwap_int​(Object subject,
                                               long offset,
                                               int expected,
                                               int replacement)

      • compareAndSwap_long

        public static final boolean compareAndSwap_long​(Object subject,
                                                long offset,
                                                long expected,
                                                long replacement)

      • compareAndSwapObject

        public static final boolean compareAndSwapObject​(Object subject,
                                                 long offset,
                                                 Object expected,
                                                 Object replacement)

      • nativeByteOrder

        public static ByteOrder nativeByteOrder()

      • resolveByteOrder

        public static ByteOrder resolveByteOrder​(String name)

      • throwUnchecked

        public static final void throwUnchecked​(Throwable t)

      • ensureClassInitialized

        public static final void ensureClassInitialized​(Class<?>... classes)

      • ensureClassInitialized

        public static final void ensureClassInitialized​(Class<?> c)