Package io.permazen.kv.array

Class ArrayKVWriter

java.lang.Object

io.permazen.kv.array.ArrayKVWriter

All Implemented Interfaces:

Closeable, AutoCloseable

public class ArrayKVWriter
extends Object
implements Closeable

Writes ArrayKVStore index, key, and value data, given a sorted sequence of key/value pairs.

Key and value data must not exceed 2GB (each separately).

Constructor Summary

Constructors

Constructor	Description
ArrayKVWriter(OutputStream indxOutput, OutputStream keysOutput, OutputStream valsOutput)	Constructor.

Method Summary

Modifier and Type	Method	Description
void	close()	Close all three outputs.
void	flush()	Flush all three outputs.
int	getIndxLength()	Get the number of bytes written so far to the index file.
int	getKeysLength()	Get the number of bytes written so far to the key data file.
int	getValsLength()	Get the number of bytes written so far to the value data file.
void	writeKV(byte[] key, byte[] val)	Write out the next key/value pair.
void	writeMerged(KVStore kvstore, Iterator<KVPair> kvIterator, Mutations mutations)	Merge the given key/value pair iteration with the specified mutations and write out the merged combination.

Methods inherited from class java.lang.Object

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

Constructor Details

ArrayKVWriter

public ArrayKVWriter(OutputStream indxOutput,
 OutputStream keysOutput,
 OutputStream valsOutput)

Constructor.

Parameters:

indxOutput - index file output

keysOutput - key data file output

valsOutput - value data file output

Method Details

getIndxLength

public int getIndxLength()

Get the number of bytes written so far to the index file.

Returns:

length of the index file

getKeysLength

public int getKeysLength()

Get the number of bytes written so far to the key data file.

Returns:

length of the key data file

getValsLength

public int getValsLength()

Get the number of bytes written so far to the value data file.

Returns:

length of the value data file

writeKV

public void writeKV(byte[] key,
 byte[] val)
             throws IOException

Write out the next key/value pair.

Parameters:

key - key

val - value

Throws:

IllegalArgumentException - if key is out of order (i.e., not strictly greater then the previous key)

IllegalArgumentException - if key or val is null

IllegalStateException - if either the key or data file would grow larger than 2³¹-1 bytes

IOException - if an I/O error occurrs

writeMerged

public void writeMerged(KVStore kvstore,
 Iterator<KVPair> kvIterator,
 Mutations mutations)
                 throws IOException

Merge the given key/value pair iteration with the specified mutations and write out the merged combination. What's written is the result of the key/value iteration with the mutations applied.

The KVStore parameter will only be used to invoke KVStore.encodeCounter() and KVStore.decodeCounter() in order to handle counter adjustments.

Parameters:

kvstore - callback for encoding and decoding counter values

kvIterator - key/value pairs - must be sorted in order

mutations - mutations to apply

Throws:

IllegalArgumentException - if any parameter is null

IllegalArgumentException - if kvs iterates out of order

IllegalStateException - if either the key or data file would grow larger than 2³¹-1 bytes

IOException - if an I/O error occurrs

flush

public void flush()
           throws IOException

Flush all three outputs.

Throws:

IOException - if an I/O error occurrs

close

public void close()
           throws IOException

Close all three outputs.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException - if an I/O error occurrs