org.apache.flink.runtime.memory

类 AbstractPagedOutputView

java.lang.Object

org.apache.flink.runtime.memory.AbstractPagedOutputView

所有已实现的接口:

DataOutput, org.apache.flink.core.memory.DataOutputView

直接已知子类:

ChannelWriterOutputView, FileChannelOutputView, HashPartition.BuildSideBuffer, RandomAccessOutputView, SerializedUpdateBuffer, SimpleCollectingOutputView, SpillingBuffer

public abstract class AbstractPagedOutputView
extends Object
implements org.apache.flink.core.memory.DataOutputView

The base class for all output views that are backed by multiple memory pages. This base class contains all encoding methods to write data to a page and detect page boundary crossing. The concrete sub classes must implement the methods to collect the current page and provide the next memory page once the boundary is crossed.

The paging assumes that all memory segments are of the same size.

字段概要

字段

限定符和类型	字段和说明
protected int	headerLength
protected int	segmentSize

构造器概要

构造器

限定符	构造器和说明
protected	AbstractPagedOutputView(int segmentSize, int headerLength)
protected	AbstractPagedOutputView(org.apache.flink.core.memory.MemorySegment initialSegment, int segmentSize, int headerLength) Creates a new output view that writes initially to the given initial segment.

方法概要

限定符和类型	方法和说明
protected void	advance() Moves the output view to the next page.
protected void	clear() Clears the internal state.
int	getCurrentPositionInSegment() Gets the current write position (the position where the next bytes will be written) in the current memory segment.
org.apache.flink.core.memory.MemorySegment	getCurrentSegment() Gets the segment that the view currently writes to.
int	getSegmentSize() Gets the size of the segments used by this view.
protected abstract org.apache.flink.core.memory.MemorySegment	nextSegment(org.apache.flink.core.memory.MemorySegment current, int positionInCurrent) This method must return a segment.
protected void	seekOutput(org.apache.flink.core.memory.MemorySegment seg, int position) Sets the internal state to the given memory segment and the given position within the segment.
void	skipBytesToWrite(int numBytes)
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(org.apache.flink.core.memory.DataInputView source, int numBytes)
void	write(int b)
void	writeBoolean(boolean v)
void	writeByte(int v)
void	writeBytes(String s)
void	writeChar(int v)
void	writeChars(String s)
void	writeDouble(double v)
void	writeFloat(float v)
void	writeInt(int v)
void	writeLong(long v)
void	writeShort(int v)
void	writeUTF(String str)

从类继承的方法 java.lang.Object

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

字段详细资料

segmentSize

protected final int segmentSize

headerLength

protected final int headerLength

构造器详细资料

AbstractPagedOutputView

protected AbstractPagedOutputView(org.apache.flink.core.memory.MemorySegment initialSegment,
                                  int segmentSize,
                                  int headerLength)

Creates a new output view that writes initially to the given initial segment. All segments in the view have to be of the given segmentSize. A header of length headerLength is left at the beginning of each segment.

参数:

initialSegment - The segment that the view starts writing to.

segmentSize - The size of the memory segments.

headerLength - The number of bytes to skip at the beginning of each segment for the header.

AbstractPagedOutputView

protected AbstractPagedOutputView(int segmentSize,
                                  int headerLength)

参数:

segmentSize - The size of the memory segments.

headerLength - The number of bytes to skip at the beginning of each segment for the header.

方法详细资料

nextSegment

protected abstract org.apache.flink.core.memory.MemorySegment nextSegment(org.apache.flink.core.memory.MemorySegment current,
                                                                          int positionInCurrent)
                                                                   throws IOException

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

参数:

current - The current memory segment

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

返回:

The next memory segment.

抛出:

IOException

getCurrentSegment

public org.apache.flink.core.memory.MemorySegment getCurrentSegment()

Gets the segment that the view currently writes to.

返回:

The segment the view currently writes to.

getCurrentPositionInSegment

public int getCurrentPositionInSegment()

Gets the current write position (the position where the next bytes will be written) in the current memory segment.

返回:

The current write offset in the current memory segment.

getSegmentSize

public int getSegmentSize()

Gets the size of the segments used by this view.

返回:

The memory segment size.

advance

protected void advance()
                throws IOException

Moves the output view to the next page. This method invokes internally the nextSegment(MemorySegment, int) method to give the current memory segment to the concrete subclass' implementation and obtain the next segment to write to. Writing will continue inside the new segment after the header.

抛出:

IOException - Thrown, if the current segment could not be processed or a new segment could not be obtained.

seekOutput

protected void seekOutput(org.apache.flink.core.memory.MemorySegment seg,
                          int position)

Sets the internal state to the given memory segment and the given position within the segment.

参数:

seg - The memory segment to write the next bytes to.

position - The position to start writing the next bytes to.

clear

protected void clear()

Clears the internal state. Any successive write calls will fail until either advance() or seekOutput(MemorySegment, int) is called.

另请参阅:

advance(), seekOutput(MemorySegment, int)

write

public void write(int b)
           throws IOException

指定者:

write 在接口中 DataOutput

抛出:

IOException

write

public void write(byte[] b)
           throws IOException

指定者:

write 在接口中 DataOutput

抛出:

IOException

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

指定者:

write 在接口中 DataOutput

抛出:

IOException

writeBoolean

public void writeBoolean(boolean v)
                  throws IOException

指定者:

writeBoolean 在接口中 DataOutput

抛出:

IOException

writeByte

public void writeByte(int v)
               throws IOException

指定者:

writeByte 在接口中 DataOutput

抛出:

IOException

writeShort

public void writeShort(int v)
                throws IOException

指定者:

writeShort 在接口中 DataOutput

抛出:

IOException

writeChar

public void writeChar(int v)
               throws IOException

指定者:

writeChar 在接口中 DataOutput

抛出:

IOException

writeInt

public void writeInt(int v)
              throws IOException

指定者:

writeInt 在接口中 DataOutput

抛出:

IOException

writeLong

public void writeLong(long v)
               throws IOException

指定者:

writeLong 在接口中 DataOutput

抛出:

IOException

writeFloat

public void writeFloat(float v)
                throws IOException

指定者:

writeFloat 在接口中 DataOutput

抛出:

IOException

writeDouble

public void writeDouble(double v)
                 throws IOException

指定者:

writeDouble 在接口中 DataOutput

抛出:

IOException

writeBytes

public void writeBytes(String s)
                throws IOException

指定者:

writeBytes 在接口中 DataOutput

抛出:

IOException

writeChars

public void writeChars(String s)
                throws IOException

指定者:

writeChars 在接口中 DataOutput

抛出:

IOException

writeUTF

public void writeUTF(String str)
              throws IOException

指定者:

writeUTF 在接口中 DataOutput

抛出:

IOException

skipBytesToWrite

public void skipBytesToWrite(int numBytes)
                      throws IOException

指定者:

skipBytesToWrite 在接口中 org.apache.flink.core.memory.DataOutputView

抛出:

IOException

write

public void write(org.apache.flink.core.memory.DataInputView source,
                  int numBytes)
           throws IOException

指定者:

write 在接口中 org.apache.flink.core.memory.DataOutputView

抛出:

IOException