org.apache.hudi.common.table.log

Class HoodieLogFormatReverseReader

java.lang.Object

org.apache.hudi.common.table.log.HoodieLogFormatReverseReader

All Implemented Interfaces:

Closeable, AutoCloseable, Iterator<HoodieLogBlock>, HoodieLogFormat.Reader

public class HoodieLogFormatReverseReader
extends Object
implements HoodieLogFormat.Reader

A log format reader by reading log files and blocks in reserve order. This reader assumes that each log file only has one log block.

Method Summary

Modifier and Type	Method and Description
void	close()
HoodieLogFile	getLogFile()
boolean	hasNext()
boolean	hasPrev() Read log file in reverse order and check if prev block is present.
HoodieLogBlock	next()
HoodieLogBlock	prev() Read log file in reverse order and return prev block if present.
void	remove()

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

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<HoodieLogBlock>

next

public HoodieLogBlock next()

Specified by:

next in interface Iterator<HoodieLogBlock>

getLogFile

public HoodieLogFile getLogFile()

Specified by:

getLogFile in interface HoodieLogFormat.Reader

Returns:

the path to this HoodieLogFormat

remove

public void remove()

Specified by:

remove in interface Iterator<HoodieLogBlock>

hasPrev

public boolean hasPrev()

Description copied from interface: HoodieLogFormat.Reader

Read log file in reverse order and check if prev block is present.

Specified by:

hasPrev in interface HoodieLogFormat.Reader

Returns:

prev

public HoodieLogBlock prev()
                    throws IOException

Description copied from interface: HoodieLogFormat.Reader

Read log file in reverse order and return prev block if present.

Specified by:

prev in interface HoodieLogFormat.Reader

Returns:

Throws:

IOException