Package org.apache.hugegraph.computer.core.io

Class UnsafeBytesOutput

java.lang.Object

org.apache.hugegraph.computer.core.io.UnsafeBytesOutput

All Implemented Interfaces:

java.io.Closeable, java.io.DataOutput, java.lang.AutoCloseable, org.apache.hugegraph.computer.core.io.BytesOutput, org.apache.hugegraph.computer.core.io.RandomAccessOutput

Direct Known Subclasses:

AbstractBufferedFileOutput, BufferedStreamOutput

public class UnsafeBytesOutput
extends java.lang.Object
implements org.apache.hugegraph.computer.core.io.BytesOutput

Use unsafe method to write the value to the buffer to improve the write performance. The buffer is auto extendable.

Constructor Summary

Constructors

Constructor	Description
UnsafeBytesOutput(int size)

Method Summary

Modifier and Type	Method	Description
byte[]	buffer()
void	close()
long	position()
protected void	require(int size)
protected void	require(long position, int size)
void	seek(long position)
long	skip(long bytesToSkip)	If you write some thing, and you need to write the serialized byte size first.
byte[]	toByteArray()
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)
void	write(org.apache.hugegraph.computer.core.io.RandomAccessInput input, long offset, long length)
void	writeBoolean(boolean v)
void	writeByte(int v)
void	writeBytes(java.lang.String s)
void	writeChar(int v)
void	writeChars(java.lang.String s)
void	writeDouble(double v)
void	writeFixedInt(int v)
void	writeFixedInt(long position, int v)
void	writeFloat(float v)
void	writeInt(int v)
void	writeLong(long v)
void	writeShort(int v)
void	writeUTF(java.lang.String s)

Methods inherited from class java.lang.Object

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

Constructor Detail

UnsafeBytesOutput

public UnsafeBytesOutput(int size)

Method Detail

write

public void write(int b)
           throws java.io.IOException

Specified by:

write in interface java.io.DataOutput

Throws:

java.io.IOException

write

public void write(byte[] b)
           throws java.io.IOException

Specified by:

write in interface java.io.DataOutput

Throws:

java.io.IOException

write

public void write(byte[] b,
                  int off,
                  int len)
           throws java.io.IOException

Specified by:

write in interface java.io.DataOutput

Throws:

java.io.IOException

writeBoolean

public void writeBoolean(boolean v)
                  throws java.io.IOException

Specified by:

writeBoolean in interface java.io.DataOutput

Throws:

java.io.IOException

writeByte

public void writeByte(int v)
               throws java.io.IOException

Specified by:

writeByte in interface java.io.DataOutput

Throws:

java.io.IOException

writeShort

public void writeShort(int v)
                throws java.io.IOException

Specified by:

writeShort in interface java.io.DataOutput

Throws:

java.io.IOException

writeChar

public void writeChar(int v)
               throws java.io.IOException

Specified by:

writeChar in interface java.io.DataOutput

Throws:

java.io.IOException

writeInt

public void writeInt(int v)
              throws java.io.IOException

Specified by:

writeInt in interface java.io.DataOutput

Throws:

java.io.IOException

writeLong

public void writeLong(long v)
               throws java.io.IOException

Specified by:

writeLong in interface java.io.DataOutput

Throws:

java.io.IOException

writeFloat

public void writeFloat(float v)
                throws java.io.IOException

Specified by:

writeFloat in interface java.io.DataOutput

Throws:

java.io.IOException

writeDouble

public void writeDouble(double v)
                 throws java.io.IOException

Specified by:

writeDouble in interface java.io.DataOutput

Throws:

java.io.IOException

writeBytes

public void writeBytes(java.lang.String s)
                throws java.io.IOException

Specified by:

writeBytes in interface java.io.DataOutput

Throws:

java.io.IOException

writeChars

public void writeChars(java.lang.String s)
                throws java.io.IOException

Specified by:

writeChars in interface java.io.DataOutput

Throws:

java.io.IOException

writeUTF

public void writeUTF(java.lang.String s)
              throws java.io.IOException

Specified by:

writeUTF in interface java.io.DataOutput

Throws:

java.io.IOException

position

public long position()

Specified by:

position in interface org.apache.hugegraph.computer.core.io.RandomAccessOutput

seek

public void seek(long position)
          throws java.io.IOException

Specified by:

seek in interface org.apache.hugegraph.computer.core.io.RandomAccessOutput

Throws:

java.io.IOException

skip

public long skip(long bytesToSkip)
          throws java.io.IOException

If you write some thing, and you need to write the serialized byte size first. If the byte size is unknown when write, you can skip 4 bytes （size of int）first, after write out the content, get the serialized byte size and calls writeInt(int position, int v) to write the int at skipped position. The serialized byte size can be get by the difference of position() before and after write the content.

Specified by:

skip in interface org.apache.hugegraph.computer.core.io.RandomAccessOutput

Returns:

the position before skip.

Throws:

java.io.IOException

write

public void write(org.apache.hugegraph.computer.core.io.RandomAccessInput input,
                  long offset,
                  long length)
           throws java.io.IOException

Specified by:

write in interface org.apache.hugegraph.computer.core.io.RandomAccessOutput

Throws:

java.io.IOException

writeFixedInt

public void writeFixedInt(int v)
                   throws java.io.IOException

Specified by:

writeFixedInt in interface org.apache.hugegraph.computer.core.io.RandomAccessOutput

Throws:

java.io.IOException

writeFixedInt

public void writeFixedInt(long position,
                          int v)
                   throws java.io.IOException

Specified by:

writeFixedInt in interface org.apache.hugegraph.computer.core.io.RandomAccessOutput

Throws:

java.io.IOException

buffer

public byte[] buffer()

Specified by:

buffer in interface org.apache.hugegraph.computer.core.io.BytesOutput

Returns:

the internal byte array, can't modify the returned byte array

toByteArray

public byte[] toByteArray()

Specified by:

toByteArray in interface org.apache.hugegraph.computer.core.io.BytesOutput

Returns:

Copied byte array.

require

protected void require(int size)
                throws java.io.IOException

Throws:

java.io.IOException

require

protected void require(long position,
                       int size)
                throws java.io.IOException

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.lang.AutoCloseable

Specified by:

close in interface java.io.Closeable

Throws:

java.io.IOException