org.apache.flink.streaming.runtime.io

类 CachedBufferBlocker

java.lang.Object

org.apache.flink.streaming.runtime.io.CachedBufferBlocker

所有已实现的接口:

BufferBlocker

@Internal
public class CachedBufferBlocker
extends Object
implements BufferBlocker

The cached buffer blocker takes the buffers and events from a data stream and adds them to a memory queue. After a number of elements have been cached, the blocker can "roll over": It presents the cached elements as a readable sequence, and creates a new memory queue.

This buffer blocked can be used in credit-based flow control for better barrier alignment in exactly-once mode.

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	CachedBufferBlocker.CachedBufferOrEventSequence This class represents a sequence of cached buffers and events, created by the CachedBufferBlocker.

构造器概要

构造器

构造器和说明
CachedBufferBlocker(int pageSize) Creates a new buffer blocker, caching the buffers or events in memory queue.

方法概要

限定符和类型	方法和说明
void	add(org.apache.flink.runtime.io.network.partition.consumer.BufferOrEvent boe) Adds a buffer or event to the blocker.
void	close() Cleans up all the resources in the current sequence.
long	getBytesBlocked() Gets the number of bytes blocked in the current sequence.
BufferOrEventSequence	rollOverReusingResources() It is never reusing resources and is defaulting to rollOverWithoutReusingResources().
BufferOrEventSequence	rollOverWithoutReusingResources() Starts a new sequence of buffers and event without reusing the same resources and returns the current sequence of buffers for reading.

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

CachedBufferBlocker

public CachedBufferBlocker(int pageSize)

Creates a new buffer blocker, caching the buffers or events in memory queue.

参数:

pageSize - The page size used to estimate the cached size.

方法详细资料

add

public void add(org.apache.flink.runtime.io.network.partition.consumer.BufferOrEvent boe)

从接口复制的说明: BufferBlocker

Adds a buffer or event to the blocker.

指定者:

add 在接口中 BufferBlocker

参数:

boe - The buffer or event to be added into the blocker.

rollOverReusingResources

public BufferOrEventSequence rollOverReusingResources()

It is never reusing resources and is defaulting to rollOverWithoutReusingResources().

指定者:

rollOverReusingResources 在接口中 BufferBlocker

返回:

The readable sequence of buffers and events, or 'null', if nothing was added.

rollOverWithoutReusingResources

public BufferOrEventSequence rollOverWithoutReusingResources()

从接口复制的说明: BufferBlocker

Starts a new sequence of buffers and event without reusing the same resources and returns the current sequence of buffers for reading.

指定者:

rollOverWithoutReusingResources 在接口中 BufferBlocker

返回:

The readable sequence of buffers and events, or 'null', if nothing was added.

close

public void close()

从接口复制的说明: BufferBlocker

Cleans up all the resources in the current sequence.

指定者:

close 在接口中 BufferBlocker

getBytesBlocked

public long getBytesBlocked()

从接口复制的说明: BufferBlocker

Gets the number of bytes blocked in the current sequence.

指定者:

getBytesBlocked 在接口中 BufferBlocker

返回:

the number of bytes blocked in the current sequence.