org.apache.druid.segment.data

Class GenericIndexedWriter<T>

java.lang.Object

org.apache.druid.segment.data.GenericIndexedWriter<T>

All Implemented Interfaces:

DictionaryWriter<T>, Serializer

public class GenericIndexedWriter<T>
extends Object
implements DictionaryWriter<T>

Streams arrays of objects out in the binary format described by GenericIndexed The version EncodedStringDictionaryWriter.VERSION is reserved and must never be specified as the GenericIndexed version byte, else it will interfere with string column deserialization.

Constructor Summary

Constructors

Constructor and Description
GenericIndexedWriter(SegmentWriteOutMedium segmentWriteOutMedium, String filenameBase, ObjectStrategy<T> strategy)
GenericIndexedWriter(SegmentWriteOutMedium segmentWriteOutMedium, String filenameBase, ObjectStrategy<T> strategy, int fileSizeLimit)

Method Summary

Modifier and Type	Method and Description
static ObjectStrategy<ByteBuffer>	compressedByteBuffersWriteObjectStrategy(CompressionStrategy compressionStrategy, int bufferSize, Closer closer)
static String	generateHeaderFileName(String fileNameBase)
static String	generateValueFileName(String fileNameBase, int fileNum)
T	get(int index)
int	getCardinality()
long	getSerializedSize() Returns the number of bytes, that this Serializer will write to the output _channel_ (not smoosher) on a Serializer.writeTo(java.nio.channels.WritableByteChannel, org.apache.druid.java.util.common.io.smoosh.FileSmoosher) call.
boolean	isSorted()
static GenericIndexedWriter<ByteBuffer>	ofCompressedByteBuffers(SegmentWriteOutMedium segmentWriteOutMedium, String filenameBase, CompressionStrategy compressionStrategy, int bufferSize)
void	open()
void	setObjectsNotSorted()
void	write(T objectToWrite)
void	writeTo(WritableByteChannel channel, FileSmoosher smoosher) Writes serialized form of this object to the given channel.

Methods inherited from class java.lang.Object

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

Constructor Detail

GenericIndexedWriter

public GenericIndexedWriter(SegmentWriteOutMedium segmentWriteOutMedium,
                            String filenameBase,
                            ObjectStrategy<T> strategy)

GenericIndexedWriter

public GenericIndexedWriter(SegmentWriteOutMedium segmentWriteOutMedium,
                            String filenameBase,
                            ObjectStrategy<T> strategy,
                            int fileSizeLimit)

Method Detail

ofCompressedByteBuffers

public static GenericIndexedWriter<ByteBuffer> ofCompressedByteBuffers(SegmentWriteOutMedium segmentWriteOutMedium,
                                                                       String filenameBase,
                                                                       CompressionStrategy compressionStrategy,
                                                                       int bufferSize)

compressedByteBuffersWriteObjectStrategy

public static ObjectStrategy<ByteBuffer> compressedByteBuffersWriteObjectStrategy(CompressionStrategy compressionStrategy,
                                                                                  int bufferSize,
                                                                                  Closer closer)

generateValueFileName

public static String generateValueFileName(String fileNameBase,
                                           int fileNum)

generateHeaderFileName

public static String generateHeaderFileName(String fileNameBase)

open

public void open()
          throws IOException

Specified by:

open in interface DictionaryWriter<T>

Throws:

IOException

setObjectsNotSorted

public void setObjectsNotSorted()

isSorted

public boolean isSorted()

Specified by:

isSorted in interface DictionaryWriter<T>

write

public void write(@Nullable
                  T objectToWrite)
           throws IOException

Specified by:

write in interface DictionaryWriter<T>

Throws:

IOException

get

@Nullable
public T get(int index)
                throws IOException

Specified by:

get in interface DictionaryWriter<T>

Throws:

IOException

getCardinality

public int getCardinality()

Specified by:

getCardinality in interface DictionaryWriter<T>

getSerializedSize

public long getSerializedSize()

Description copied from interface: Serializer

Returns the number of bytes, that this Serializer will write to the output _channel_ (not smoosher) on a Serializer.writeTo(java.nio.channels.WritableByteChannel, org.apache.druid.java.util.common.io.smoosh.FileSmoosher) call.

Specified by:

getSerializedSize in interface Serializer

writeTo

public void writeTo(WritableByteChannel channel,
                    @Nullable
                    FileSmoosher smoosher)
             throws IOException

Description copied from interface: Serializer

Writes serialized form of this object to the given channel. If parallel data streams are needed, they could be created with the provided smoosher.

Specified by:

writeTo in interface Serializer

Throws:

IOException