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Java Source Code / Java Documentation » Search Engine » Jofti » com.jofti.store

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

com.jofti.store .BlockBuffer

BlockBuffer
class BlockBuffer (Code)
	Each block contains a header, zero or more entries, and a footer.

Field Summary
ByteBuffer	buffer
final static int	bufferFooterSize The number of bytes to reserve for block footer information.
final static int	bufferHeaderSize size of a buffer header.
int	bufferSize
int	bytesUsed Number of used data bytes in the buffer. This is different than buffer capacity().
final int	bytesUsedOffSet
FileStore	file
int	initCounter number of times this buffer was used.
int	numberEntries
FilePositionHolder	positionHolder
int	recordSize

Constructor Summary
	BlockBuffer() default constructor calls super class constructor.

Method Summary
public FileStore	getFileStore()
public FilePositionHolder	getPositionHolder()
String	getStats() return statistics for this buffer.
public void	init(int bufferSize) initialize members for buffer reuse. Parameters: bsn - Logic Block Sequence Number of the buffer.BufferManager maintains a list of block sequence numbersto ensure correct order of writes to disk.
int	put(ByteBuffer buf, int offset)
void	put(ByteBuffer buf)
BlockBuffer	read(FileStore store) Reads a block from FileStore lf and validates header and footer information.
public int	remaining()
public void	reset()
public void	setFileStore(FileStore file)
public void	setPositionHolder(FilePositionHolder positionHolder)
void	write() write ByteBuffer to the log file.
void	writeFooter()
void	writeFurniture(int numberRecords)

Field Detail

buffer
ByteBuffer buffer(Code)

bufferFooterSize
final static int bufferFooterSize(Code)
	The number of bytes to reserve for block footer information.

bufferHeaderSize
final static int bufferHeaderSize(Code)
	size of a buffer header. buffer Header format byte[] HEADER_ID [1] "H" short size of bytes written [2] short total number of items [2] byte[] CRLF [2] to make it easier to read buffers in an editor

bufferSize
int bufferSize(Code)

bytesUsed

int bytesUsed(Code)

Number of used data bytes in the buffer.

This is different than buffer capacity(). The bytes used is the number of bytes of usable data in a buffer.

set by operations that read data from files into the buffer such as read().

checked by operations that retrieve logical records from the buffer get().

bytesUsedOffSet
final int bytesUsedOffSet(Code)

file
FileStore file(Code)

initCounter
int initCounter(Code)
	number of times this buffer was used. In general, should be about the same for all buffers in a pool.

numberEntries
int numberEntries(Code)

positionHolder
FilePositionHolder positionHolder(Code)

recordSize
int recordSize(Code)

Constructor Detail

BlockBuffer
BlockBuffer()(Code)
	default constructor calls super class constructor.

Method Detail

getFileStore
public FileStore getFileStore()(Code)

getPositionHolder
public FilePositionHolder getPositionHolder()(Code)

getStats
String getStats()(Code)
	return statistics for this buffer. String containing statistics as an XML node

init
public void init(int bufferSize) throws JoftiException(Code)
	initialize members for buffer reuse. Parameters: bsn - Logic Block Sequence Number of the buffer.BufferManager maintains a list of block sequence numbersto ensure correct order of writes to disk. Some implementationsof LogBuffer may include the BSN as part of a record orblock header.

put
int put(ByteBuffer buf, int offset) throws JoftiException(Code)

put
void put(ByteBuffer buf) throws JoftiException(Code)

read
BlockBuffer read(FileStore store) throws JoftiException(Code)
	Reads a block from FileStore lf and validates header and footer information. See Also: LogBuffer.read(FileStorelong) throws: IOException - if anything goes wrong during the file read. throws: InvalidLogBufferException - if any of the block header or footer fields are invalid.

remaining
public int remaining()(Code)

reset
public void reset()(Code)

setFileStore
public void setFileStore(FileStore file)(Code)

setPositionHolder
public void setPositionHolder(FilePositionHolder positionHolder)(Code)

write
void write() throws IOException(Code)
	write ByteBuffer to the log file.

writeFooter
void writeFooter()(Code)

writeFurniture
void writeFurniture(int numberRecords)(Code)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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