org.apache.hadoop.hbase.io.hfile
Class NoOpDataBlockEncoder

java.lang.Object
  org.apache.hadoop.hbase.io.hfile.NoOpDataBlockEncoder

All Implemented Interfaces:

HFileDataBlockEncoder

@InterfaceAudience.Private
public class NoOpDataBlockEncoder
extends Object
implements HFileDataBlockEncoder

Does not perform any kind of encoding/decoding.

Field Summary

static NoOpDataBlockEncoder

INSTANCE

Fields inherited from interface org.apache.hadoop.hbase.io.hfile.HFileDataBlockEncoder

DATA_BLOCK_ENCODING

Method Summary

void	beforeWriteToDisk(ByteBuffer in, HFileBlockEncodingContext encodeCtx, BlockType blockType) Should be called before an encoded or unencoded data block is written to disk.
DataBlockEncoding	getDataBlockEncoding()
HFileBlockDecodingContext	newDataBlockDecodingContext(HFileContext meta) create a encoder specific decoding context for reading.
HFileBlockEncodingContext	newDataBlockEncodingContext(byte[] dummyHeader, HFileContext meta) Create an encoder specific encoding context object for writing.
void	saveMetadata(HFile.Writer writer) Save metadata in HFile which will be written to disk
String	toString()
boolean	useEncodedScanner() Decides whether we should use a scanner over encoded blocks.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final NoOpDataBlockEncoder INSTANCE

Method Detail

beforeWriteToDisk

public void beforeWriteToDisk(ByteBuffer in,
                              HFileBlockEncodingContext encodeCtx,
                              BlockType blockType)
                       throws IOException

Description copied from interface: HFileDataBlockEncoder

Should be called before an encoded or unencoded data block is written to disk.

Specified by:

beforeWriteToDisk in interface HFileDataBlockEncoder

Parameters:

in - KeyValues next to each other

encodeCtx - the encoded result

blockType - block type

Throws:

IOException

useEncodedScanner

public boolean useEncodedScanner()

Description copied from interface: HFileDataBlockEncoder

Decides whether we should use a scanner over encoded blocks.

Specified by:

useEncodedScanner in interface HFileDataBlockEncoder

Returns:

Whether to use encoded scanner.

saveMetadata

public void saveMetadata(HFile.Writer writer)

Description copied from interface: HFileDataBlockEncoder

Save metadata in HFile which will be written to disk

Specified by:

saveMetadata in interface HFileDataBlockEncoder

Parameters:

writer - writer for a given HFile

getDataBlockEncoding

public DataBlockEncoding getDataBlockEncoding()

Specified by:

getDataBlockEncoding in interface HFileDataBlockEncoder

Returns:

the data block encoding

toString

public String toString()

Overrides:

toString in class Object

newDataBlockEncodingContext

public HFileBlockEncodingContext newDataBlockEncodingContext(byte[] dummyHeader,
                                                             HFileContext meta)

Description copied from interface: HFileDataBlockEncoder

Create an encoder specific encoding context object for writing. And the encoding context should also perform compression if compressionAlgorithm is valid.

Specified by:

newDataBlockEncodingContext in interface HFileDataBlockEncoder

Parameters:

dummyHeader - header bytes

meta - HFile meta data

Returns:

a new HFileBlockEncodingContext object

newDataBlockDecodingContext

public HFileBlockDecodingContext newDataBlockDecodingContext(HFileContext meta)

Description copied from interface: HFileDataBlockEncoder

create a encoder specific decoding context for reading. And the decoding context should also do decompression if compressionAlgorithm is valid.

Specified by:

newDataBlockDecodingContext in interface HFileDataBlockEncoder

Parameters:

meta - - HFile meta data

Returns:

a new HFileBlockDecodingContext object