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

Class AbstractBufferedFileOutput

java.lang.Object

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

org.apache.hugegraph.computer.core.io.AbstractBufferedFileOutput

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:

BufferedFileOutput, ValueFileOutput

public abstract class AbstractBufferedFileOutput
extends UnsafeBytesOutput

Field Summary

Fields

Modifier and Type	Field	Description
protected long	fileOffset

Constructor Summary

Constructors

Constructor	Description
AbstractBufferedFileOutput(int bufferCapacity)

Method Summary

Modifier and Type	Method	Description
protected int	bufferAvailable()
protected int	bufferCapacity()
protected int	bufferSize()
protected abstract void	flushBuffer()
long	position()
protected void	require(int size)
long	skip(long bytesToSkip)	If you write some thing, and you need to write the serialized byte size first.
void	writeFixedInt(long position, int v)

Methods inherited from class org.apache.hugegraph.computer.core.io.UnsafeBytesOutput

buffer, close, require, seek, toByteArray, write, write, write, write, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFixedInt, writeFloat, writeInt, writeLong, writeShort, writeUTF

Methods inherited from class java.lang.Object

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

Field Detail

fileOffset

protected long fileOffset

Constructor Detail

AbstractBufferedFileOutput

public AbstractBufferedFileOutput(int bufferCapacity)

Method Detail

writeFixedInt

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

Specified by:

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

Overrides:

writeFixedInt in class UnsafeBytesOutput

Throws:

java.io.IOException

position

public long position()

Specified by:

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

Overrides:

position in class UnsafeBytesOutput

skip

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

Description copied from class: UnsafeBytesOutput

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 UnsafeBytesOutput.position() before and after write the content.

Specified by:

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

Overrides:

skip in class UnsafeBytesOutput

Returns:

the position before skip.

Throws:

java.io.IOException

require

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

Overrides:

require in class UnsafeBytesOutput

Throws:

java.io.IOException

bufferSize

protected int bufferSize()

bufferAvailable

protected int bufferAvailable()

bufferCapacity

protected int bufferCapacity()

flushBuffer

protected abstract void flushBuffer()
                             throws java.io.IOException

Throws:

java.io.IOException