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Java Source Code / Java Documentation » Database DBMS » hsql » org.hsqldb.persist

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

org.hsqldb.persist .Cache

Cache

public class Cache (Code)

New implementation of row caching for CACHED tables.

Manages memory for the cache map and its contents based on least recently used clearup.

Also provides services for selecting rows to be saved and passing them to DataFileCache.

author:
fredt@users
version:
1.8.0

Inner Class :static class CachedObjectComparator implements ObjectComparator

Field Summary
long	cacheBytesLength
final DataFileCache	dataFileCache
int	makeRowCount
StopWatch	makeRowTimer
StopWatch	saveAllTimer
int	saveRowCount
StopWatch	sortTimer

Constructor Summary
	Cache(DataFileCache dfc)

Method Summary
synchronized void	clear()
synchronized CachedObject	get(int pos) Returns a row if in memory cache.
long	getTotalCachedBlockSize()
void	init(int capacity, long bytesCapacity) Structural initialisations take place here.
synchronized void	put(int key, CachedObject row) Adds a row to the cache.
synchronized CachedObject	release(int i) Removes an object from memory cache.
synchronized void	saveAll() Writes out all modified cached Rows.
int	size()

Field Detail

cacheBytesLength
long cacheBytesLength(Code)

dataFileCache
final DataFileCache dataFileCache(Code)

makeRowCount
int makeRowCount(Code)

makeRowTimer
StopWatch makeRowTimer(Code)

saveAllTimer
StopWatch saveAllTimer(Code)

saveRowCount
int saveRowCount(Code)

sortTimer
StopWatch sortTimer(Code)

Constructor Detail

Cache
Cache(DataFileCache dfc)(Code)

Method Detail

clear
synchronized void clear()(Code)
	clears out the memory cache

get
synchronized CachedObject get(int pos)(Code)
	Returns a row if in memory cache.

getTotalCachedBlockSize
long getTotalCachedBlockSize()(Code)

init
void init(int capacity, long bytesCapacity)(Code)
	Structural initialisations take place here. This allows the Cache to be resized while the database is in operation.

put
synchronized void put(int key, CachedObject row) throws IOException(Code)
	Adds a row to the cache.

release
synchronized CachedObject release(int i)(Code)
	Removes an object from memory cache. Does not release the file storage.

saveAll
synchronized void saveAll() throws IOException(Code)
	Writes out all modified cached Rows.

size
int size()(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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