Package org.apache.flink.runtime.io.disk

Class FileChannelOutputView

java.lang.Object

org.apache.flink.runtime.memory.AbstractPagedOutputView

org.apache.flink.runtime.io.disk.FileChannelOutputView

All Implemented Interfaces:

DataOutput, DataOutputView, MemorySegmentWritable

public class FileChannelOutputView
extends AbstractPagedOutputView

A DataOutputView that is backed by a BlockChannelWriter, making it effectively a data output stream. The view writes it data in blocks to the underlying channel.

Field Summary

Fields inherited from class org.apache.flink.runtime.memory.AbstractPagedOutputView

headerLength, segmentSize

Constructor Summary

Constructors

Constructor	Description
FileChannelOutputView(BlockChannelWriter<MemorySegment> writer, MemoryManager memManager, List<MemorySegment> memory, int segmentSize)

Method Summary

Modifier and Type	Method	Description
void	close()	Closes this output, writing pending data and releasing the memory.
void	closeAndDelete()	Closes this output, writing pending data and releasing the memory.
int	getBlockCount()	Gets the number of blocks written by this output view.
int	getBytesInLatestSegment()	Gets the number of bytes written in the latest memory segment.
long	getWriteOffset()
protected MemorySegment	nextSegment(MemorySegment current, int posInSegment)	This method must return a segment.

Methods inherited from class org.apache.flink.runtime.memory.AbstractPagedOutputView

advance, clear, getCurrentPositionInSegment, getCurrentSegment, getHeaderLength, getSegmentSize, seekOutput, skipBytesToWrite, write, write, write, write, write, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFloat, writeInt, writeLong, writeShort, writeUTF

Methods inherited from class java.lang.Object

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

Constructor Detail

FileChannelOutputView

public FileChannelOutputView(BlockChannelWriter<MemorySegment> writer,
                             MemoryManager memManager,
                             List<MemorySegment> memory,
                             int segmentSize)
                      throws IOException

Throws:

IOException

Method Detail

close

public void close()
           throws IOException

Closes this output, writing pending data and releasing the memory.

Throws:

IOException - Thrown, if the pending data could not be written.

closeAndDelete

public void closeAndDelete()
                    throws IOException

Closes this output, writing pending data and releasing the memory.

Throws:

IOException - Thrown, if the pending data could not be written.

getBlockCount

public int getBlockCount()

Gets the number of blocks written by this output view.

Returns:

The number of blocks written by this output view.

getBytesInLatestSegment

public int getBytesInLatestSegment()

Gets the number of bytes written in the latest memory segment.

Returns:

The number of bytes written in the latest memory segment.

getWriteOffset

public long getWriteOffset()

nextSegment

protected MemorySegment nextSegment(MemorySegment current,
                                    int posInSegment)
                             throws IOException

Description copied from class: AbstractPagedOutputView

This method must return a segment. If no more segments are available, it must throw an EOFException.

Specified by:

nextSegment in class AbstractPagedOutputView

Parameters:

current - The current memory segment

posInSegment - The position in the segment, one after the last valid byte.

Returns:

The next memory segment.

Throws:

IOException