org.apache.paimon.reader

接口 RecordReader<T>

所有超级接口:

AutoCloseable, Closeable

@Public
public interface RecordReader<T>
extends Closeable

The reader that reads the batches of records.

从以下版本开始:

0.4.0

嵌套类概要

嵌套类

限定符和类型	接口和说明
static interface	RecordReader.RecordIterator<T> An internal iterator interface which presents a more restrictive API than Iterator.

方法概要

限定符和类型	方法和说明
void	close() Closes the reader and should release all resources.
default RecordReader<T>	filter(Filter<T> filter) Filters a RecordReader.
default void	forEachRemaining(java.util.function.Consumer<? super T> action) Performs the given action for each remaining element in RecordReader until all elements have been processed or the action throws an exception.
default void	forIOEachRemaining(ConsumerWithIOException<? super T> action) Performs the given action for each remaining element in RecordReader until all elements have been processed or the action throws an exception.
RecordReader.RecordIterator<T>	readBatch() Reads one batch.
default CloseableIterator<T>	toCloseableIterator() Convert this reader to a CloseableIterator.
default <R> RecordReader<R>	transform(java.util.function.Function<T,R> function) Returns a RecordReader that applies function to each element.

方法详细资料

readBatch

@Nullable
RecordReader.RecordIterator<T> readBatch()
                                            throws IOException

Reads one batch. The method should return null when reaching the end of the input.

The returned iterator object and any contained objects may be held onto by the source for some time, so it should not be immediately reused by the reader.

抛出:

IOException

close

void close()
    throws IOException

Closes the reader and should release all resources.

指定者:

close 在接口中 AutoCloseable

指定者:

close 在接口中 Closeable

抛出:

IOException

forEachRemaining

default void forEachRemaining(java.util.function.Consumer<? super T> action)
                       throws IOException

Performs the given action for each remaining element in RecordReader until all elements have been processed or the action throws an exception.

抛出:

IOException

forIOEachRemaining

default void forIOEachRemaining(ConsumerWithIOException<? super T> action)
                         throws IOException

Performs the given action for each remaining element in RecordReader until all elements have been processed or the action throws an exception.

抛出:

IOException

transform

default <R> RecordReader<R> transform(java.util.function.Function<T,R> function)

Returns a RecordReader that applies function to each element.

filter

default RecordReader<T> filter(Filter<T> filter)

Filters a RecordReader.

toCloseableIterator

default CloseableIterator<T> toCloseableIterator()

Convert this reader to a CloseableIterator.