org.apache.flink.runtime.io.disk

类 SeekableFileChannelInputView

java.lang.Object

org.apache.flink.runtime.memory.AbstractPagedInputView

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

所有已实现的接口:

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

字段概要

从类继承的字段 org.apache.flink.runtime.memory.AbstractPagedInputView

headerLength

构造器概要

构造器

构造器和说明
SeekableFileChannelInputView(IOManager ioManager, FileIOChannel.ID channelId, MemoryManager memManager, List<org.apache.flink.core.memory.MemorySegment> memory, int sizeOfLastBlock)

方法概要

限定符和类型	方法和说明
void	close()
void	closeAndDelete()
protected int	getLimitForSegment(org.apache.flink.core.memory.MemorySegment segment) Gets the limit for reading bytes from the given memory segment.
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	seek(long position)

从类继承的方法 org.apache.flink.runtime.memory.AbstractPagedInputView

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

从类继承的方法 java.lang.Object

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

构造器详细资料

SeekableFileChannelInputView

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

抛出:

IOException

方法详细资料

seek

public void seek(long position)
          throws IOException

抛出:

IOException

close

public void close()
           throws IOException

抛出:

IOException

closeAndDelete

public void closeAndDelete()
                    throws IOException

抛出:

IOException

nextSegment

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

从类复制的说明: 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.

指定者:

nextSegment 在类中 AbstractPagedInputView

参数:

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

返回:

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

抛出:

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(org.apache.flink.core.memory.MemorySegment segment)

从类复制的说明: 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.

指定者:

getLimitForSegment 在类中 AbstractPagedInputView

参数:

segment - The segment to determine the limit for.

返回:

The limit for the given memory segment.