mobios.mckoi.store
Class BufferManager

java.lang.Object
  mobios.mckoi.store.BufferManager

public final class BufferManager
extends Object

A centralized manager that manages one or more AbstractBufferedFile implementstions. This object manages memory usage of the children buffers and implements a caching strategy for purging old pages from memory.

Author:

Tobias Downer

Constructor Summary

BufferManager(String paging_implementation, int max_pages, int page_size)
Constructs the manager.

Method Summary

void	addTime(long l)
FileBufferAccessor	createBufferedAccessor(RandomAccessFile file, String mode) Creates and returns a FileBufferAccess object that is used to access the RandomAccessFile through this buffer manager.
long	getCache_hit_count()
long	getCache_miss_count()
void	printStatistics() Added by Willard, 2005.05.24

Methods inherited from class java.lang.Object

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

Constructor Detail

BufferManager

public BufferManager(String paging_implementation,
                     int max_pages,
                     int page_size)

Constructs the manager.

Method Detail

createBufferedAccessor

public FileBufferAccessor createBufferedAccessor(RandomAccessFile file,
                                                 String mode)
                                          throws IOException

Creates and returns a FileBufferAccess object that is used to access the RandomAccessFile through this buffer manager.

Throws:

IOException

getCache_hit_count

public long getCache_hit_count()

Returns:

Returns the cache_hit_count.

getCache_miss_count

public long getCache_miss_count()

Returns:

Returns the cache_miss_count.

addTime

public void addTime(long l)

Parameters:

l -

printStatistics

public void printStatistics()

Added by Willard, 2005.05.24