org.apache.flink.runtime.io.disk

Class RandomAccessInputView

java.lang.Object

org.apache.flink.runtime.memory.AbstractPagedInputView

org.apache.flink.runtime.io.disk.RandomAccessInputView

All Implemented Interfaces:

DataInput, org.apache.flink.core.memory.DataInputView, org.apache.flink.core.memory.SeekableDataInputView

public class RandomAccessInputView
extends AbstractPagedInputView
implements org.apache.flink.core.memory.SeekableDataInputView

Field Summary

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

headerLength

Constructor Summary

Constructors

Constructor and Description
RandomAccessInputView(ArrayList<org.apache.flink.core.memory.MemorySegment> segments, int segmentSize)
RandomAccessInputView(ArrayList<org.apache.flink.core.memory.MemorySegment> segments, int segmentSize, int limitInLastSegment)

Method Summary

Modifier and Type	Method and Description
protected int	getLimitForSegment(org.apache.flink.core.memory.MemorySegment segment) Gets the limit for reading bytes from the given memory segment.
long	getReadPosition()
protected org.apache.flink.core.memory.MemorySegment	nextSegment(org.apache.flink.core.memory.MemorySegment current) The method by which concrete subclasses realize page crossing.
void	setReadPosition(long position)

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

advance, clear, doAdvance, getCurrentPositionInSegment, getCurrentSegment, getCurrentSegmentLimit, getHeaderLength, read, read, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, seekInput, skipBytes, skipBytesToRead

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.core.memory.DataInputView

read, read, skipBytesToRead

Methods inherited from interface java.io.DataInput

readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedShort, readUTF, skipBytes

Constructor Detail

RandomAccessInputView

public RandomAccessInputView(ArrayList<org.apache.flink.core.memory.MemorySegment> segments,
                             int segmentSize)

RandomAccessInputView

public RandomAccessInputView(ArrayList<org.apache.flink.core.memory.MemorySegment> segments,
                             int segmentSize,
                             int limitInLastSegment)

Method Detail

setReadPosition

public void setReadPosition(long position)

Specified by:

setReadPosition in interface org.apache.flink.core.memory.SeekableDataInputView

getReadPosition

public long getReadPosition()

nextSegment

protected org.apache.flink.core.memory.MemorySegment nextSegment(org.apache.flink.core.memory.MemorySegment current)
                                                          throws EOFException

Description copied from class: AbstractPagedInputView

The method by which concrete subclasses realize page crossing. This method is invoked when the current page is exhausted and a new page is required to continue the reading. If no further page is available, this method must throw an EOFException.

Specified by:

nextSegment in class AbstractPagedInputView

Parameters:

current - The current page that was read to its limit. May be null, if this method is invoked for the first time.

Returns:

The next page from which the reading should continue. May not be null. If the input is exhausted, an EOFException must be thrown instead.

Throws:

EOFException - Thrown, if no further segment is available.

getLimitForSegment

protected int getLimitForSegment(org.apache.flink.core.memory.MemorySegment segment)

Description copied from class: AbstractPagedInputView

Gets the limit for reading bytes from the given memory segment. This method must return the position of the byte after the last valid byte in the given memory segment. When the position returned by this method is reached, the view will attempt to switch to the next memory segment.

Specified by:

getLimitForSegment in class AbstractPagedInputView

Parameters:

segment - The segment to determine the limit for.

Returns:

The limit for the given memory segment.