net.openhft.lang.io

Class NativeBytes

java.lang.Object

net.openhft.lang.io.AbstractBytes

net.openhft.lang.io.NativeBytes

All Implemented Interfaces:

DataInput, DataOutput, ObjectInput, ObjectOutput, Appendable, AutoCloseable, CharSequence, RandomAccess, Bytes, BytesCommon, ByteStringAppender, ByteStringParser, RandomDataInput, RandomDataOutput, RandomDataUpdate, BytesMarshallable

Direct Known Subclasses:

DirectBytes, MultiStoreBytes

public class NativeBytes
extends AbstractBytes

Author:

peter.lawrey

Field Summary

Fields

Modifier and Type	Field and Description
static sun.misc.Unsafe	UNSAFE *** Access the Unsafe class *****

Fields inherited from class net.openhft.lang.io.AbstractBytes

BUSY_LOCK_LIMIT, INT_LOCK_MASK, UNSIGNED_BYTE_MASK, UNSIGNED_INT_MASK, UNSIGNED_SHORT_MASK

Constructor Summary

Constructors

Constructor and Description
NativeBytes(BytesMarshallerFactory bytesMarshallerFactory, long startAddr, long positionAddr, long limitAddr)
NativeBytes(long startAddr, long positionAddr, long limitAddr)
NativeBytes(NativeBytes bytes)

Method Summary

Methods

Modifier and Type	Method and Description
ByteOrder	byteOrder()
long	capacity()
void	checkEndOfBuffer()
boolean	compareAndSwapInt(long offset, int expected, int x) Perform a compare and set operation.
boolean	compareAndSwapLong(long offset, long expected, long x) Perform a compare and set operation.
long	limitAddr()
static long	longHash(byte[] bytes, int off, int len)
long	position()
void	position(long position)
long	positionAddr()
void	positionAddr(long positionAddr)
int	read(byte[] bytes, int off, int len) Reads into an array of bytes.
byte	readByte() Reads and returns one input byte.
byte	readByte(long offset) Reads and returns one input byte.
char	readChar() Reads two input bytes and returns a char value.
char	readChar(long offset) Reads two input bytes and returns a char value.
double	readDouble() Reads eight input bytes and returns a double value.
double	readDouble(long offset) Reads eight input bytes and returns a double value.
float	readFloat() Reads four input bytes and returns a float value.
float	readFloat(long offset) Reads four input bytes and returns a float value.
void	readFully(byte[] b, int off, int len) Reads len bytes from an input stream.
int	readInt() Reads four input bytes and returns an int value.
int	readInt(long offset) Reads four input bytes and returns an int value.
long	readLong() Reads eight input bytes and returns a long value.
long	readLong(long offset) Reads eight input bytes and returns a long value.
void	readObject(Object object, int start, int end) Read the object from start to end bytes
short	readShort() Reads two input bytes and returns a short value.
short	readShort(long offset) Reads two input bytes and returns a short value.
int	readVolatileInt() This is the same as readInt() except a read barrier is performed first.
int	readVolatileInt(long offset) This is the same as readInt() except a read barrier is performed first.
long	readVolatileLong() This is the same readLong() except a dread barrier is performed first Reads eight input bytes and returns a long value.
long	readVolatileLong(long offset) This is the same readLong() except a dread barrier is performed first Reads eight input bytes and returns a long value.
long	remaining()
long	startAddr()
void	write(byte[] bytes, int off, int len) Writes len bytes from array bytes, in order, to the output stream.
void	write(int b) Writes to the output stream the eight low-order bits of the argument b.
void	write(long offset, byte[] bytes) Writes to the output stream all the bytes in array bytes.
void	writeByte(long offset, int b) Writes to the output stream the eight low-order bits of the argument b.
void	writeChar(int v) Writes a char value, which is comprised of two bytes, to the output stream.
void	writeChar(long offset, int v) Writes a char value, which is comprised of two bytes, to the output stream.
void	writeDouble(double v) Writes a double value, which is comprised of eight bytes, to the output stream.
void	writeDouble(long offset, double v) Writes a double value, which is comprised of eight bytes, to the output stream.
void	writeFloat(float v) Writes a float value, which is comprised of four bytes, to the output stream.
void	writeFloat(long offset, float v) Writes a float value, which is comprised of four bytes, to the output stream.
void	writeInt(int v) Writes an int value, which is comprised of four bytes, to the output stream.
void	writeInt(long offset, int v) Writes an int value, which is comprised of four bytes, to the output stream.
void	writeLong(long v) Writes a long value, which is comprised of eight bytes, to the output stream.
void	writeLong(long offset, long v) Writes a long value, which is comprised of eight bytes, to the output stream.
void	writeObject(Object object, int start, int end) Copy data from an Object from bytes start to end.
void	writeOrderedInt(int v) Same as writeInt but include an ordered write barrier.
void	writeOrderedInt(long offset, int v) Same as writeInt but include an ordered write barrier.
void	writeOrderedLong(long v) Same as writeLong but include an ordered write barrier.
void	writeOrderedLong(long offset, long v) Same as writeLong but include an ordered write barrier.
void	writeShort(int v) Writes two bytes to the output stream to represent the value of the argument.
void	writeShort(long offset, int v) Writes two bytes to the output stream to represent the value of the argument.

Methods inherited from class net.openhft.lang.io.AbstractBytes

addAndGetInt, addAtomicDouble, addAtomicFloat, addAtomicInt, addAtomicLong, addByte, addDouble, addFloat, addInt, addLong, addShort, addUnsignedByte, addUnsignedInt, addUnsignedShort, append, append, append, append, append, append, append, append, append, append, append, append, append, appendDateMillis, appendDateTimeMillis, appendTimeMillis, available, busyLockInt, busyLockLong, bytesMarshallerFactory, charAt, close, currentThread, finish, flush, getAndAdd, inputStream, isFinished, length, outputStream, parseBoolean, parseDecimal, parseDouble, parseEnum, parseLong, parseLong, parseUTF, parseUTF, read, read, read, readBoolean, readBoolean, readCompactDouble, readCompactInt, readCompactLong, readCompactShort, readCompactUnsignedInt, readCompactUnsignedShort, readEnum, readFully, readInt24, readInt24, readInt48, readInt48, readLine, readList, readMap, readMarshallable, readObject, readObject, readStopBit, readUnsignedByte, readUnsignedByte, readUnsignedInt, readUnsignedInt, readUnsignedShort, readUnsignedShort, readUTF, readUTFΔ, readUTFΔ, readUTFΔ, readVolatileDouble, readVolatileFloat, reset, setCurrentThread, shortThreadId, skip, skipBytes, skipTo, stepBackAndSkipTo, subSequence, tryLockInt, tryLockLong, tryLockNanosInt, tryLockNanosLong, uniqueTid, unlockInt, unlockLong, write, write, write, writeBoolean, writeBoolean, writeByte, writeBytes, writeChars, writeCompactDouble, writeCompactInt, writeCompactLong, writeCompactShort, writeCompactUnsignedInt, writeCompactUnsignedShort, writeEnum, writeInt24, writeInt24, writeInt48, writeInt48, writeList, writeMap, writeMarshallable, writeObject, writeOrderedDouble, writeOrderedFloat, writeStartToPosition, writeStopBit, writeUnsignedByte, writeUnsignedByte, writeUnsignedInt, writeUnsignedInt, writeUnsignedShort, writeUnsignedShort, writeUTF, writeUTFΔ, writeUTFΔ

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.CharSequence

toString

Field Detail

UNSAFE

@NotNull
public static final sun.misc.Unsafe UNSAFE

*** Access the Unsafe class *****

Constructor Detail

NativeBytes

public NativeBytes(long startAddr,
           long positionAddr,
           long limitAddr)

NativeBytes

public NativeBytes(BytesMarshallerFactory bytesMarshallerFactory,
           long startAddr,
           long positionAddr,
           long limitAddr)

NativeBytes

public NativeBytes(NativeBytes bytes)

Method Detail

longHash

public static long longHash(byte[] bytes,
            int off,
            int len)

read

public int read(@NotNull
       byte[] bytes,
       int off,
       int len)

Description copied from interface: RandomDataInput

Reads into an array of bytes. This method will block until some input is available.

Specified by:

read in interface ObjectInput

Specified by:

read in interface RandomDataInput

Specified by:

read in class AbstractBytes

Parameters:

bytes - the buffer into which the data is read

off - the start offset of the data

len - the maximum number of bytes read

Returns:

the actual number of bytes read, -1 is returned when the end of the stream is reached.

readByte

public byte readByte()

Description copied from interface: RandomDataInput

Reads and returns one input byte. The byte is treated as a signed value in the range -128 through 127, inclusive. This method is suitable for reading the byte written by the writeByte method of interface DataOutput.

Returns:

the 8-bit value read.

readByte

public byte readByte(long offset)

Description copied from interface: RandomDataInput

Reads and returns one input byte. The byte is treated as a signed value in the range -128 through 127, inclusive. This method is suitable for reading the byte written by the writeByte method of interface RandomDataOutput.

Parameters:

offset - of byte to read.

Returns:

the 8-bit value read.

readFully

public void readFully(@NotNull
             byte[] b,
             int off,
             int len)

Description copied from interface: RandomDataInput

Reads len bytes from an input stream.

This method blocks until one of the following conditions occurs:

• len bytes of input data are available, in which case a normal return is made.

• End of file is detected, in which case an EOFException is thrown.

• An I/O error occurs, in which case an IOException other than EOFException is thrown.

If b is null, a NullPointerException is thrown. If off is negative, or len is negative, or off+len is greater than the length of the array b, then an IndexOutOfBoundsException is thrown. If len is zero, then no bytes are read. Otherwise, the first byte read is stored into element b[off], the next one into b[off+1], and so on. The number of bytes read is, at most, equal to len.

Parameters:

b - the buffer into which the data is read.

off - an int specifying the offset into the data.

len - an int specifying the number of bytes to read.

readShort

public short readShort()

Description copied from interface: RandomDataInput

Reads two input bytes and returns a short value. Let a be the first byte read and b be the second byte on big endian machines, and the opposite on little endian machines. The value returned is:

(short)((a << 8) | (b & 0xff))
 

This method is suitable for reading the bytes written by the writeShort method of interface DataOutput.

Returns:

the 16-bit value read.

readShort

public short readShort(long offset)

Description copied from interface: RandomDataInput

Reads two input bytes and returns a short value. Let a be the first byte read and b be the second byte on big endian machines, and the opposite on little endian machines. The value returned is:

     (short)((a << 8) | (b & 0xff))
 

This method is suitable for reading the bytes written by the writeShort method of interface RandomDataOutput.

Parameters:

offset - of short to read.

Returns:

the 16-bit value read.

readChar

public char readChar()

Description copied from interface: RandomDataInput

Reads two input bytes and returns a char value. Let a be the first byte read and b be the second byte on big endian machines, and the opposite on little endian machines. The value returned is:

(char)((a << 8) | (b & 0xff))
 

This method is suitable for reading bytes written by the writeChar method of interface DataOutput.

Returns:

the char value read.

readChar

public char readChar(long offset)

Description copied from interface: RandomDataInput

Reads two input bytes and returns a char value. Let a be the first byte read and b be the second byte on big endian machines, and the opposite on little endian machines. The value returned is:

(char)((a << 8) | (b & 0xff))
 

This method is suitable for reading bytes written by the writeChar method of interface RandomDataOutput.

Parameters:

offset - of the char to read.

Returns:

the char value read.

readInt

public int readInt()

Description copied from interface: RandomDataInput

Reads four input bytes and returns an int value. Let a-d be the first through fourth bytes read on big endian machines, and the opposite on little endian machines. The value returned is:

 
 (((a & 0xff) << 24) | ((b & 0xff) << 16) | ((c & 0xff) << 8) | (d & 0xff))
 

This method is suitable for reading bytes written by the writeInt method of interface DataOutput.

Returns:

the int value read.

readInt

public int readInt(long offset)

Description copied from interface: RandomDataInput

Reads four input bytes and returns an int value. Let a-d be the first through fourth bytes read on big endian machines, and the opposite on little endian machines. The value returned is:

 
 (((a & 0xff) << 24) | ((b & 0xff) << 16) | ((c & 0xff) << 8) | (d & 0xff))
 

This method is suitable for reading bytes written by the writeInt method of interface RandomDataOutput.

Parameters:

offset - to read from

Returns:

the int value read.

readVolatileInt

public int readVolatileInt()

Description copied from interface: RandomDataInput

This is the same as readInt() except a read barrier is performed first.

Reads four input bytes and returns an int value. Let a-d be the first through fourth bytes read on big endian machines, and the opposite on little endian machines. The value returned is:

 
 (((a & 0xff) << 24) | ((b & 0xff) << 16) | ((c & 0xff) << 8) | (d & 0xff))
 

This method is suitable for reading bytes written by the writeOrderedInt or writeVolatileInt method of interface RandomDataOutput.

Returns:

the int value read.

readVolatileInt

public int readVolatileInt(long offset)

Description copied from interface: RandomDataInput

This is the same as readInt() except a read barrier is performed first.

Reads four input bytes and returns an int value. Let a-d be the first through fourth bytes read on big endian machines, and the opposite on little endian machines. The value returned is:

 
 (((a & 0xff) << 24) | ((b & 0xff) << 16) | ((c & 0xff) << 8) | (d & 0xff))
 

This method is suitable for reading bytes written by the writeOrderedInt or writeVolatileInt method of interface RandomDataOutput.

Parameters:

offset - to read from

Returns:

the int value read.

readLong

public long readLong()

Description copied from interface: RandomDataInput

Reads eight input bytes and returns a long value. Let a-h be the first through eighth bytes read on big endian machines, and the opposite on little endian machines. The value returned is:

 
 (((long)(a & 0xff) << 56) |
  ((long)(b & 0xff) << 48) |
  ((long)(c & 0xff) << 40) |
  ((long)(d & 0xff) << 32) |
  ((long)(e & 0xff) << 24) |
  ((long)(f & 0xff) << 16) |
  ((long)(g & 0xff) <<  8) |
  ((long)(h & 0xff)))
 

This method is suitable for reading bytes written by the writeLong method of interface DataOutput.

Returns:

the long value read.

readLong

public long readLong(long offset)

Description copied from interface: RandomDataInput

Reads eight input bytes and returns a long value. Let a-h be the first through eighth bytes read on big endian machines, and the opposite on little endian machines. The value returned is:

 
 (((long)(a & 0xff) << 56) |
  ((long)(b & 0xff) << 48) |
  ((long)(c & 0xff) << 40) |
  ((long)(d & 0xff) << 32) |
  ((long)(e & 0xff) << 24) |
  ((long)(f & 0xff) << 16) |
  ((long)(g & 0xff) <<  8) |
  ((long)(h & 0xff)))
 

This method is suitable for reading bytes written by the writeLong method of interface RandomDataOutput.

Parameters:

offset - of the long to read

Returns:

the long value read.

readVolatileLong

public long readVolatileLong()

Description copied from interface: RandomDataInput

This is the same readLong() except a dread barrier is performed first

Reads eight input bytes and returns a long value. Let a-h be the first through eighth bytes read on big endian machines, and the opposite on little endian machines. The value returned is:

 
 (((long)(a & 0xff) << 56) |
  ((long)(b & 0xff) << 48) |
  ((long)(c & 0xff) << 40) |
  ((long)(d & 0xff) << 32) |
  ((long)(e & 0xff) << 24) |
  ((long)(f & 0xff) << 16) |
  ((long)(g & 0xff) <<  8) |
  ((long)(h & 0xff)))
 

This method is suitable for reading bytes written by the writeOrderedLong or writeVolatileLong method of interface RandomDataOutput.

Returns:

the long value read.

readVolatileLong

public long readVolatileLong(long offset)

Description copied from interface: RandomDataInput

This is the same readLong() except a dread barrier is performed first

Reads eight input bytes and returns a long value. Let a-h be the first through eighth bytes read on big endian machines, and the opposite on little endian machines. The value returned is:

 
 (((long)(a & 0xff) << 56) |
  ((long)(b & 0xff) << 48) |
  ((long)(c & 0xff) << 40) |
  ((long)(d & 0xff) << 32) |
  ((long)(e & 0xff) << 24) |
  ((long)(f & 0xff) << 16) |
  ((long)(g & 0xff) <<  8) |
  ((long)(h & 0xff)))
 

This method is suitable for reading bytes written by the writeOrderedLong or writeVolatileLong method of interface RandomDataOutput.

Parameters:

offset - of the long to read

Returns:

the long value read.

readFloat

public float readFloat()

Description copied from interface: RandomDataInput

Reads four input bytes and returns a float value. It does this by first constructing an int value in exactly the manner of the readInt method, then converting this int value to a float in exactly the manner of the method Float.intBitsToFloat. This method is suitable for reading bytes written by the writeFloat method of interface DataOutput.

Returns:

the float value read.

readFloat

public float readFloat(long offset)

Description copied from interface: RandomDataInput

Reads four input bytes and returns a float value. It does this by first constructing an int value in exactly the manner of the readInt method, then converting this int value to a float in exactly the manner of the method Float.intBitsToFloat. This method is suitable for reading bytes written by the writeFloat method of interface DataOutput.

Parameters:

offset - to read from

Returns:

the float value read.

readDouble

public double readDouble()

Description copied from interface: RandomDataInput

Reads eight input bytes and returns a double value. It does this by first constructing a long value in exactly the manner of the readLong method, then converting this long value to a double in exactly the manner of the method Double.longBitsToDouble. This method is suitable for reading bytes written by the writeDouble method of interface DataOutput.

Returns:

the double value read.

readDouble

public double readDouble(long offset)

Description copied from interface: RandomDataInput

Reads eight input bytes and returns a double value. It does this by first constructing a long value in exactly the manner of the readLong method, then converting this long value to a double in exactly the manner of the method Double.longBitsToDouble. This method is suitable for reading bytes written by the writeDouble method of interface DataOutput.

Parameters:

offset - to read from

Returns:

the double value read.

write

public void write(int b)

Description copied from interface: RandomDataOutput

Writes to the output stream the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.

Parameters:

b - the byte to be written.

writeByte

public void writeByte(long offset,
             int b)

Description copied from interface: RandomDataOutput

Writes to the output stream the eight low-order bits of the argument b. The 24 high-order bits of b are ignored.

Parameters:

offset - to write byte

b - the byte to be written.

write

public void write(long offset,
         @NotNull
         byte[] bytes)

Description copied from interface: RandomDataOutput

Writes to the output stream all the bytes in array bytes. If bytes is null, a NullPointerException is thrown. If bytes.length is zero, then no bytes are written. Otherwise, the byte bytes[0] is written first, then bytes[1], and so on; the last byte written is bytes[bytes.length-1].

Specified by:

write in interface RandomDataOutput

Overrides:

write in class AbstractBytes

Parameters:

offset - to be written

bytes - the data.

write

public void write(byte[] bytes,
         int off,
         int len)

Description copied from interface: RandomDataOutput

Writes len bytes from array bytes, in order, to the output stream. If bytes is null, a NullPointerException is thrown. If off is negative, or len is negative, or off+len is greater than the length of the array bytes, then an IndexOutOfBoundsException is thrown. If len is zero, then no bytes are written. Otherwise, the byte bytes[off] is written first, then bytes[off+1], and so on; the last byte written is bytes[off+len-1].

Specified by:

write in interface DataOutput

Specified by:

write in interface ObjectOutput

Specified by:

write in interface RandomDataOutput

Overrides:

write in class AbstractBytes

Parameters:

bytes - the data.

off - the start offset in the data.

len - the number of bytes to write.

writeShort

public void writeShort(int v)

Description copied from interface: RandomDataOutput

Writes two bytes to the output stream to represent the value of the argument. The byte values to be written, in the order shown for big endian machines and the opposite for little endian, are:

 (byte)(0xff & (v >> 8))
 (byte)(0xff & v)
  

The bytes written by this method may be read by the readShort method of interface DataInput , which will then return a short equal to (short)v.

Parameters:

v - the short value to be written.

writeShort

public void writeShort(long offset,
              int v)

Description copied from interface: RandomDataOutput

Writes two bytes to the output stream to represent the value of the argument. The byte values to be written, in the order shown for big endian machines and the opposite for little endian, are:

 (byte)(0xff & (v >> 8))
 (byte)(0xff & v)
  

The bytes written by this method may be read by the readShort method of interface DataInput , which will then return a short equal to (short)v.

Parameters:

offset - to be written to

v - the short value to be written.

writeChar

public void writeChar(int v)

Description copied from interface: RandomDataOutput

Writes a char value, which is comprised of two bytes, to the output stream. The byte values to be written, in the order shown for big endian machines and the opposite for little endian, are:

 (byte)(0xff & (v >> 8))
 (byte)(0xff & v)
 

The bytes written by this method may be read by the readChar method of interface DataInput , which will then return a char equal to (char)v.

Parameters:

v - the char value to be written.

writeChar

public void writeChar(long offset,
             int v)

Description copied from interface: RandomDataOutput

Writes a char value, which is comprised of two bytes, to the output stream. The byte values to be written, in the order shown for big endian machines and the opposite for little endian, are:

 (byte)(0xff & (v >> 8))
 (byte)(0xff & v)
 

The bytes written by this method may be read by the readChar method of interface DataInput , which will then return a char equal to (char)v.

Parameters:

offset - to be written to

v - the char value to be written.

writeInt

public void writeInt(int v)

Description copied from interface: RandomDataOutput

Writes an int value, which is comprised of four bytes, to the output stream. The byte values to be written, in the order shown for big endian machines and the opposite for little endian, are:

 (byte)(0xff & (v >> 24))
 (byte)(0xff & (v >> 16))
 (byte)(0xff & (v >>    8))
 (byte)(0xff & v)
 

The bytes written by this method may be read by the readInt method of interface DataInput , which will then return an int equal to v.

Parameters:

v - the int value to be written.

writeInt

public void writeInt(long offset,
            int v)

Description copied from interface: RandomDataOutput

Writes an int value, which is comprised of four bytes, to the output stream. The byte values to be written, in the order shown for big endian machines and the opposite for little endian, are:

 (byte)(0xff & (v >> 24))
 (byte)(0xff & (v >> 16))
 (byte)(0xff & (v >>    8))
 (byte)(0xff & v)
 

The bytes written by this method may be read by the readInt method of interface DataInput , which will then return an int equal to v.

Parameters:

offset - to be written to

v - the int value to be written.

writeOrderedInt

public void writeOrderedInt(int v)

Description copied from interface: RandomDataOutput

Same as writeInt but include an ordered write barrier. This means all writes will be visible on a read barrier if this write is visible. This might not be visible to be same thread for some clock cycles so an immediate read could see an old value

This is much faster than a volatile write which stalls the pipeline. The data is visible to other threads at the same time.

Parameters:

v - value to write

writeOrderedInt

public void writeOrderedInt(long offset,
                   int v)

Description copied from interface: RandomDataOutput

Same as writeInt but include an ordered write barrier. This means all writes will be visible on a read barrier if this write is visible. This might not be visible to be same thread for some clock cycles so an immediate read could see an old value

This is much faster than writeVolatileInt as the volatile write stalls the pipeline. The data is visible to other threads at the same time.

Parameters:

offset - to write to

v - value to write

compareAndSwapInt

public boolean compareAndSwapInt(long offset,
                        int expected,
                        int x)

Description copied from interface: RandomDataOutput

Perform a compare and set operation. The value is set to x provided the expected value is set already. This operation is atomic.

Parameters:

offset - to write to.

expected - to expect

x - to set if expected was found

Returns:

true if set, false if the value was not expected

writeLong

public void writeLong(long v)

Description copied from interface: RandomDataOutput

Writes a long value, which is comprised of eight bytes, to the output stream. The byte values to be written, in the order shown for big endian machines and the opposite for little endian, are:

 (byte)(0xff & (v >> 56))
 (byte)(0xff & (v >> 48))
 (byte)(0xff & (v >> 40))
 (byte)(0xff & (v >> 32))
 (byte)(0xff & (v >> 24))
 (byte)(0xff & (v >> 16))
 (byte)(0xff & (v >>  8))
 (byte)(0xff & v)
 

The bytes written by this method may be read by the readLong method of interface DataInput , which will then return a long equal to v.

Parameters:

v - the long value to be written.

writeLong

public void writeLong(long offset,
             long v)

Description copied from interface: RandomDataOutput

Writes a long value, which is comprised of eight bytes, to the output stream. The byte values to be written, in the order shown for big endian machines and the opposite for little endian, are:

 (byte)(0xff & (v >> 56))
 (byte)(0xff & (v >> 48))
 (byte)(0xff & (v >> 40))
 (byte)(0xff & (v >> 32))
 (byte)(0xff & (v >> 24))
 (byte)(0xff & (v >> 16))
 (byte)(0xff & (v >>  8))
 (byte)(0xff & v)
 

The bytes written by this method may be read by the readLong method of interface DataInput , which will then return a long equal to v.

Parameters:

offset - to be written to

v - the long value to be written.

writeOrderedLong

public void writeOrderedLong(long v)

Description copied from interface: RandomDataOutput

Same as writeLong but include an ordered write barrier. This means all writes will be visible on a read barrier if this write is visible. This might not be visible to be same thread for some clock cycles so an immediate read could see an old value

This is much faster than a volatile write which stalls the pipeline. The data is visible to other threads at the same time.

Parameters:

v - value to write

writeOrderedLong

public void writeOrderedLong(long offset,
                    long v)

Description copied from interface: RandomDataOutput

Same as writeLong but include an ordered write barrier. This means all writes will be visible on a read barrier if this write is visible. This might not be visible to be same thread for some clock cycles so an immediate read could see an old value

This is much faster than a volatile write which stalls the pipeline. The data is visible to other threads at the same time.

Parameters:

offset - to be written to

v - value to write

compareAndSwapLong

public boolean compareAndSwapLong(long offset,
                         long expected,
                         long x)

Description copied from interface: RandomDataOutput

Perform a compare and set operation. The value is set to x provided the expected value is set already. This operation is atomic.

Parameters:

offset - to write to.

expected - to expect

x - to set if expected was found

Returns:

true if set, false if the value was not expected

writeFloat

public void writeFloat(float v)

Description copied from interface: RandomDataOutput

Writes a float value, which is comprised of four bytes, to the output stream. It does this as if it first converts this float value to an int in exactly the manner of the Float.floatToIntBits method and then writes the int value in exactly the manner of the writeInt method. The bytes written by this method may be read by the readFloat method of interface DataInput, which will then return a float equal to v.

Parameters:

v - the float value to be written.

writeFloat

public void writeFloat(long offset,
              float v)

Description copied from interface: RandomDataOutput

Writes a float value, which is comprised of four bytes, to the output stream. It does this as if it first converts this float value to an int in exactly the manner of the Float.floatToIntBits method and then writes the int value in exactly the manner of the writeInt method. The bytes written by this method may be read by the readFloat method of interface DataInput, which will then return a float equal to v.

Parameters:

offset - to write to

v - the float value to be written.

writeDouble

public void writeDouble(double v)

Description copied from interface: RandomDataOutput

Writes a double value, which is comprised of eight bytes, to the output stream. It does this as if it first converts this double value to a long in exactly the manner of the Double.doubleToLongBits method and then writes the long value in exactly the manner of the writeLong method. The bytes written by this method may be read by the readDouble method of interface DataInput, which will then return a double equal to v.

Parameters:

v - the double value to be written.

writeDouble

public void writeDouble(long offset,
               double v)

Description copied from interface: RandomDataOutput

Writes a double value, which is comprised of eight bytes, to the output stream. It does this as if it first converts this double value to a long in exactly the manner of the Double.doubleToLongBits method and then writes the long value in exactly the manner of the writeLong method. The bytes written by this method may be read by the readDouble method of interface DataInput, which will then return a double equal to v.

Parameters:

offset - to write to

v - the double value to be written.

readObject

public void readObject(Object object,
              int start,
              int end)

Description copied from interface: RandomDataInput

Read the object from start to end bytes

Parameters:

object - to read into

start - byte inclusive

end - byte exclusive

writeObject

public void writeObject(Object object,
               int start,
               int end)

Description copied from interface: RandomDataOutput

Copy data from an Object from bytes start to end.

Parameters:

object - to copy from

start - first byte inclusive

end - last byte exclusive.

position

public long position()

Returns:

the offset read/written so far

position

public void position(long position)

Parameters:

position - to skip to

capacity

public long capacity()

Returns:

space available

remaining

public long remaining()

Returns:

space remaining in bytes

byteOrder

@NotNull
public ByteOrder byteOrder()

Returns:

Byte order for reading binary

checkEndOfBuffer

public void checkEndOfBuffer()
                      throws IndexOutOfBoundsException

Throws:

IndexOutOfBoundsException - if the bounds of the Bytes has been exceeded.

startAddr

public long startAddr()

positionAddr

public long positionAddr()

positionAddr

public void positionAddr(long positionAddr)

limitAddr

public long limitAddr()