org.apache.flink.runtime.io.disk

Class SeekableFileChannelInputView

java.lang.Object

org.apache.flink.runtime.memory.AbstractPagedInputView

org.apache.flink.runtime.io.disk.SeekableFileChannelInputView

All Implemented Interfaces:

DataInput, DataInputView

public class SeekableFileChannelInputView
extends AbstractPagedInputView

A DataInputView that is backed by a BlockChannelReader, making it effectively a data input stream. The view reads it data in blocks from the underlying channel. The view can read data that has been written by a FileChannelOutputView, or that was written in blocks in another fashion.

Field Summary

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

headerLength

Constructor Summary

Constructors

Constructor and Description
SeekableFileChannelInputView(IOManager ioManager, FileIOChannel.ID channelId, MemoryManager memManager, List<MemorySegment> memory, int sizeOfLastBlock)

Method Summary

Modifier and Type	Method and Description
void	close()
void	closeAndDelete()
protected int	getLimitForSegment(MemorySegment segment) Gets the limit for reading bytes from the given memory segment.
protected MemorySegment	nextSegment(MemorySegment current) The method by which concrete subclasses realize page crossing.
void	seek(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

Constructor Detail

SeekableFileChannelInputView

public SeekableFileChannelInputView(IOManager ioManager,
                                    FileIOChannel.ID channelId,
                                    MemoryManager memManager,
                                    List<MemorySegment> memory,
                                    int sizeOfLastBlock)
                             throws IOException

Throws:

IOException

Method Detail

seek

public void seek(long position)
          throws IOException

Throws:

IOException

close

public void close()
           throws IOException

Throws:

IOException

closeAndDelete

public void closeAndDelete()
                    throws IOException

Throws:

IOException

nextSegment

protected MemorySegment nextSegment(MemorySegment current)
                             throws IOException

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.

IOException - Thrown, if the method cannot provide the next page due to an I/O related problem.

getLimitForSegment

protected int getLimitForSegment(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.