nl.renarj.jasdb.core.storage.datablocks

Interface DataBlock

All Superinterfaces:

Block

All Known Implementing Classes:

DataBlockImpl

public interface DataBlock
extends Block

Author:

Renze de Vries

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	DataBlock.WriteResult

Method Summary

Modifier and Type	Method and Description
int	available()
int	capacity() The capacity of the block available for storage, this is excluding the size of the header.
void	flush()
ByteBuffer	getBuffer()
DataBlockHeader	getHeader()
ReadWriteLock	getLockManager()
DataBlockResult<byte[]>	loadBytes(int offset) Load bytes from the datablock, providing an offset from the start of the block.
DataBlockResult<byte[]>	loadBytes(long absolutePosition)
DataBlockResult<Long>	loadLong(int offset)
DataBlockResult<Long>	loadLong(long absolutePosition)
DataBlock	loadNext()
DataBlockResult<BlockDataInputStream>	loadStream(int offset)
DataBlockResult<BlockDataInputStream>	loadStream(long absolutePosition)
void	reset()
int	size() Returns the data size of the block on the disk including the size of the header.
DataBlock.WriteResult	writeBytes(byte[] bytes)
DataBlock.WriteResult	writeLong(long value)
DataBlock.WriteResult	writeStream(InputStream stream)

Methods inherited from interface nl.renarj.jasdb.core.storage.datablocks.Block

close, getPosition

Method Detail

getHeader

DataBlockHeader getHeader()

loadNext

DataBlock loadNext()
            throws JasDBStorageException

Throws:

JasDBStorageException

flush

void flush()
    throws JasDBStorageException

Throws:

JasDBStorageException

size

int size()

Returns the data size of the block on the disk including the size of the header.

Returns:

The size of the data block on the disk including header

capacity

int capacity()

The capacity of the block available for storage, this is excluding the size of the header.

Returns:

The storage capacity of the block

available

int available()

reset

void reset()

getBuffer

ByteBuffer getBuffer()

getLockManager

ReadWriteLock getLockManager()

loadBytes

DataBlockResult<byte[]> loadBytes(int offset)
                           throws JasDBStorageException

Load bytes from the datablock, providing an offset from the start of the block. If the offset exceeds the block size it will start loading from the block chain.

Parameters:

offset - The offset to start loading the data from

Returns:

The bytes loaded fully into memory

Throws:

JasDBStorageException - If unable to load the bytes from the block

loadBytes

DataBlockResult<byte[]> loadBytes(long absolutePosition)
                           throws JasDBStorageException

Throws:

JasDBStorageException

loadStream

DataBlockResult<BlockDataInputStream> loadStream(int offset)
                                          throws JasDBStorageException

Throws:

JasDBStorageException

loadStream

DataBlockResult<BlockDataInputStream> loadStream(long absolutePosition)
                                          throws JasDBStorageException

Throws:

JasDBStorageException

loadLong

DataBlockResult<Long> loadLong(int offset)
                        throws JasDBStorageException

Throws:

JasDBStorageException

loadLong

DataBlockResult<Long> loadLong(long absolutePosition)
                        throws JasDBStorageException

Throws:

JasDBStorageException

writeBytes

DataBlock.WriteResult writeBytes(byte[] bytes)
                          throws JasDBStorageException

Throws:

JasDBStorageException

writeStream

DataBlock.WriteResult writeStream(InputStream stream)
                           throws JasDBStorageException

Throws:

JasDBStorageException

writeLong

DataBlock.WriteResult writeLong(long value)
                         throws JasDBStorageException

Throws:

JasDBStorageException