org.apache.flink.runtime.operators.resettable

Class ReusingBlockResettableIterator<T>

java.lang.Object

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

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

All Implemented Interfaces:

Iterator<T>, MemoryBlockIterator, ResettableIterator<T>

public class ReusingBlockResettableIterator<T>
extends NonReusingBlockResettableIterator<T>

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

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	closed
protected SimpleCollectingOutputView	collectingView
protected ArrayList<MemorySegment>	emptySegments
protected ArrayList<MemorySegment>	fullSegments
static org.slf4j.Logger	LOG
protected int	numRecordsInBuffer
protected int	numRecordsReturned
protected RandomAccessInputView	readView
protected TypeSerializer<T>	serializer

Fields inherited from class org.apache.flink.runtime.operators.resettable.NonReusingBlockResettableIterator

input, leftOverElement, nextElement, noMoreBlocks, readPhase

Constructor Summary

Constructors

Constructor and Description
ReusingBlockResettableIterator(MemoryManager memoryManager, Iterator<T> input, TypeSerializer<T> serializer, int numPages, AbstractInvokable ownerTask)
ReusingBlockResettableIterator(MemoryManager memoryManager, TypeSerializer<T> serializer, int numPages, AbstractInvokable ownerTask)

Method Summary

Methods

Modifier and Type	Method and Description
protected T	getNextRecord()
protected T	getNextRecord(T reuse)
boolean	hasNext()
void	open()
protected boolean	writeNextRecord(T record)

Methods inherited from class org.apache.flink.runtime.operators.resettable.NonReusingBlockResettableIterator

close, hasFurtherInput, next, nextBlock, remove, reopen, reset

Methods inherited from class java.lang.Object

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

Field Detail

LOG

public static final org.slf4j.Logger LOG

readView

protected final RandomAccessInputView readView

collectingView

protected final SimpleCollectingOutputView collectingView

serializer

protected final TypeSerializer<T> serializer

numRecordsInBuffer

protected int numRecordsInBuffer

numRecordsReturned

protected int numRecordsReturned

emptySegments

protected final ArrayList<MemorySegment> emptySegments

fullSegments

protected final ArrayList<MemorySegment> fullSegments

closed

protected volatile boolean closed

Constructor Detail

ReusingBlockResettableIterator

public ReusingBlockResettableIterator(MemoryManager memoryManager,
                              Iterator<T> input,
                              TypeSerializer<T> serializer,
                              int numPages,
                              AbstractInvokable ownerTask)
                               throws MemoryAllocationException

Throws:

MemoryAllocationException

ReusingBlockResettableIterator

public ReusingBlockResettableIterator(MemoryManager memoryManager,
                              TypeSerializer<T> serializer,
                              int numPages,
                              AbstractInvokable ownerTask)
                               throws MemoryAllocationException

Throws:

MemoryAllocationException

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<T>

Overrides:

hasNext in class NonReusingBlockResettableIterator<T>

open

public void open()

writeNextRecord

protected boolean writeNextRecord(T record)
                           throws IOException

Throws:

IOException

getNextRecord

protected T getNextRecord(T reuse)
                   throws IOException

Throws:

IOException

getNextRecord

protected T getNextRecord()
                   throws IOException

Throws:

IOException