org.apache.flink.runtime.operators.resettable

类 NonReusingBlockResettableIterator<T>

java.lang.Object

org.apache.flink.runtime.operators.resettable.NonReusingBlockResettableIterator<T>

所有已实现的接口:

Iterator<T>, MemoryBlockIterator, ResettableIterator<T>

直接已知子类:

ReusingBlockResettableIterator

public class NonReusingBlockResettableIterator<T>
extends Object
implements ResettableIterator<T>

Implementation of an iterator that fetches a block of data into main memory and offers resettable access to the data in that block.

字段概要

字段

限定符和类型	字段和说明
protected boolean	closed
protected SimpleCollectingOutputView	collectingView
protected ArrayList<org.apache.flink.core.memory.MemorySegment>	emptySegments
protected ArrayList<org.apache.flink.core.memory.MemorySegment>	fullSegments
protected Iterator<T>	input
protected T	leftOverElement
static org.slf4j.Logger	LOG
protected T	nextElement
protected boolean	noMoreBlocks
protected int	numRecordsInBuffer
protected int	numRecordsReturned
protected boolean	readPhase
protected RandomAccessInputView	readView
protected org.apache.flink.api.common.typeutils.TypeSerializer<T>	serializer

构造器概要

构造器

构造器和说明
NonReusingBlockResettableIterator(MemoryManager memoryManager, Iterator<T> input, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer, int numPages, AbstractInvokable ownerTask)
NonReusingBlockResettableIterator(MemoryManager memoryManager, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer, int numPages, AbstractInvokable ownerTask)

方法概要

限定符和类型	方法和说明
void	close() This method closes the iterator and releases all resources.
protected T	getNextRecord()
protected T	getNextRecord(T reuse)
boolean	hasFurtherInput() Checks, whether the input that is blocked by this iterator, has further elements available.
boolean	hasNext()
T	next()
boolean	nextBlock() Move the iterator to the next memory block.
void	open()
void	remove()
void	reopen(Iterator<T> input)
void	reset() Resets the iterator.
protected boolean	writeNextRecord(T record)

从类继承的方法 java.lang.Object

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

从接口继承的方法 java.util.Iterator

forEachRemaining

字段详细资料

LOG

public static final org.slf4j.Logger LOG

input

protected Iterator<T> input

nextElement

protected T nextElement

leftOverElement

protected T leftOverElement

readPhase

protected boolean readPhase

noMoreBlocks

protected boolean noMoreBlocks

readView

protected final RandomAccessInputView readView

collectingView

protected final SimpleCollectingOutputView collectingView

serializer

protected final org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer

numRecordsInBuffer

protected int numRecordsInBuffer

numRecordsReturned

protected int numRecordsReturned

emptySegments

protected final ArrayList<org.apache.flink.core.memory.MemorySegment> emptySegments

fullSegments

protected final ArrayList<org.apache.flink.core.memory.MemorySegment> fullSegments

closed

protected volatile boolean closed

构造器详细资料

NonReusingBlockResettableIterator

public NonReusingBlockResettableIterator(MemoryManager memoryManager,
                                         Iterator<T> input,
                                         org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer,
                                         int numPages,
                                         AbstractInvokable ownerTask)
                                  throws MemoryAllocationException

抛出:

MemoryAllocationException

NonReusingBlockResettableIterator

public NonReusingBlockResettableIterator(MemoryManager memoryManager,
                                         org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer,
                                         int numPages,
                                         AbstractInvokable ownerTask)
                                  throws MemoryAllocationException

抛出:

MemoryAllocationException

方法详细资料

reopen

public void reopen(Iterator<T> input)
            throws IOException

抛出:

IOException

hasNext

public boolean hasNext()

指定者:

hasNext 在接口中 Iterator<T>

next

public T next()

指定者:

next 在接口中 Iterator<T>

remove

public void remove()

指定者:

remove 在接口中 Iterator<T>

reset

public void reset()

从接口复制的说明: ResettableIterator

Resets the iterator.

指定者:

reset 在接口中 ResettableIterator<T>

nextBlock

public boolean nextBlock()
                  throws IOException

从接口复制的说明: MemoryBlockIterator

Move the iterator to the next memory block. The next memory block starts at the first element that was not in the block before. A special case is when no record was in the block before, which happens when this function is invoked two times directly in a sequence, without calling hasNext() or next in between. Then the block moves one element.

指定者:

nextBlock 在接口中 MemoryBlockIterator

返回:

True if a new memory block was loaded, false if there were no further records and hence no further memory block.

抛出:

IOException - Thrown, when advancing to the next block failed.

hasFurtherInput

public boolean hasFurtherInput()

Checks, whether the input that is blocked by this iterator, has further elements available. This method may be used to forecast (for example at the point where a block is full) whether there will be more data (possibly in another block).

返回:

True, if there will be more data, false otherwise.

close

public void close()

This method closes the iterator and releases all resources. This method works both as a regular shutdown and as a canceling method. The method may be called multiple times and will not produce an error.

open

public void open()

writeNextRecord

protected boolean writeNextRecord(T record)
                           throws IOException

抛出:

IOException

getNextRecord

protected T getNextRecord(T reuse)
                   throws IOException

抛出:

IOException

getNextRecord

protected T getNextRecord()
                   throws IOException

抛出:

IOException