org.apache.flink.connector.file.src.util

类 SingletonResultIterator<E>

java.lang.Object

org.apache.flink.connector.file.src.util.RecyclableIterator<E>

org.apache.flink.connector.file.src.util.SingletonResultIterator<E>

类型参数:

E - The type of the record returned by the iterator.

所有已实现的接口:

BulkFormat.RecordIterator<E>

@PublicEvolving
public final class SingletonResultIterator<E>
extends RecyclableIterator<E>
implements BulkFormat.RecordIterator<E>

A simple BulkFormat.RecordIterator that returns a single value. The iterator is mutable to support object reuse and supports recycling.

构造器概要

构造器

构造器和说明
SingletonResultIterator()
SingletonResultIterator(Runnable recycler)

方法概要

限定符和类型	方法和说明
RecordAndPosition<E>	next() Gets the next record from the file, together with its position.
void	set(E element, long offset, long skipCount) Sets the single record to be returned by this iterator.

从类继承的方法 org.apache.flink.connector.file.src.util.RecyclableIterator

releaseBatch

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 org.apache.flink.connector.file.src.reader.BulkFormat.RecordIterator

releaseBatch

构造器详细资料

SingletonResultIterator

public SingletonResultIterator()

SingletonResultIterator

public SingletonResultIterator(@Nullable
                               Runnable recycler)

方法详细资料

set

public void set(E element,
                long offset,
                long skipCount)

Sets the single record to be returned by this iterator. The offset and records-to-skip count will be used as provided here for the returned RecordAndPosition, meaning they need to point to AFTER this specific record (because a checkpoint taken after the record was processed needs to resume from after this record).

next

@Nullable
public RecordAndPosition<E> next()

从接口复制的说明: BulkFormat.RecordIterator

Gets the next record from the file, together with its position.

The position information returned with the record point to the record AFTER the returned record, because it defines the point where the reading should resume once the current record is emitted. The position information is put in the source's state when the record is emitted. If a checkpoint is taken directly after the record is emitted, the checkpoint must to describe where to resume the source reading from after that record.

Objects returned by this method may be reused by the iterator. By the time that this method is called again, no object returned from the previous call will be referenced any more. That makes it possible to have a single MutableRecordAndPosition object and return the same instance (with updated record and position) on every call.

指定者:

next 在接口中 BulkFormat.RecordIterator<E>