Package org.apache.hadoop.ozone.container.metadata

Class AbstractDatanodeStore.KeyValueBlockIterator

java.lang.Object

org.apache.hadoop.ozone.container.metadata.AbstractDatanodeStore.KeyValueBlockIterator

All Implemented Interfaces:

Closeable, AutoCloseable, BlockIterator<org.apache.hadoop.ozone.container.common.helpers.BlockData>

Enclosing class:

AbstractDatanodeStore

@Public
public static class AbstractDatanodeStore.KeyValueBlockIterator
extends Object
implements BlockIterator<org.apache.hadoop.ozone.container.common.helpers.BlockData>, Closeable

Block Iterator for KeyValue Container. This block iterator returns blocks which match with the MetadataKeyFilters.KeyPrefixFilter. The default filter is DEFAULT_BLOCK_FILTER.

Method Summary

Modifier and Type	Method	Description
void	close()
boolean	hasNext()	This checks if iterator has next element.
org.apache.hadoop.ozone.container.common.helpers.BlockData	nextBlock()	This method returns blocks matching with the filter.
void	seekToFirst()	Seek to first entry.
void	seekToLast()	Seek to last entry.

Methods inherited from class java.lang.Object

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

Method Details

nextBlock

public org.apache.hadoop.ozone.container.common.helpers.BlockData nextBlock()
                                                                     throws IOException,
NoSuchElementException

This method returns blocks matching with the filter.

Specified by:

nextBlock in interface BlockIterator<org.apache.hadoop.ozone.container.common.helpers.BlockData>

Returns:

next block or null if no more blocks

Throws:

IOException

NoSuchElementException

hasNext

public boolean hasNext()
                throws IOException

Description copied from interface: BlockIterator

This checks if iterator has next element. If it has returns true, otherwise false.

Specified by:

hasNext in interface BlockIterator<org.apache.hadoop.ozone.container.common.helpers.BlockData>

Returns:

boolean

Throws:

IOException

seekToFirst

public void seekToFirst()

Description copied from interface: BlockIterator

Seek to first entry.

Specified by:

seekToFirst in interface BlockIterator<org.apache.hadoop.ozone.container.common.helpers.BlockData>

seekToLast

public void seekToLast()

Description copied from interface: BlockIterator

Seek to last entry.

Specified by:

seekToLast in interface BlockIterator<org.apache.hadoop.ozone.container.common.helpers.BlockData>

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException