Package 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	Description
protected boolean	closed
protected final SimpleCollectingOutputView	collectingView
protected final ArrayList<org.apache.flink.core.memory.MemorySegment>	emptySegments
protected final ArrayList<org.apache.flink.core.memory.MemorySegment>	fullSegments
static final org.slf4j.Logger	LOG
protected int	numRecordsInBuffer
protected int	numRecordsReturned
protected final RandomAccessInputView	readView
protected final org.apache.flink.api.common.typeutils.TypeSerializer<T>	serializer

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

input, leftOverElement, nextElement, noMoreBlocks, readPhase

Constructor Summary

Constructors

Constructor	Description
ReusingBlockResettableIterator(MemoryManager memoryManager, Iterator<T> input, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer, int numPages, AbstractInvokable ownerTask)
ReusingBlockResettableIterator(MemoryManager memoryManager, org.apache.flink.api.common.typeutils.TypeSerializer<T> serializer, int numPages, AbstractInvokable ownerTask)

Method Summary

Modifier and Type	Method	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

Methods inherited from interface java.util.Iterator

forEachRemaining

Field Details

LOG

public static final org.slf4j.Logger LOG

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

Constructor Details

ReusingBlockResettableIterator

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

Throws:

MemoryAllocationException

ReusingBlockResettableIterator

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

Throws:

MemoryAllocationException

Method Details

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