org.tranche.flatfile
Class DataBlockCache

java.lang.Object
  org.tranche.flatfile.DataBlockCache

public class DataBlockCache
extends java.lang.Object

Used to cache the location of a chunk.

The idea is that hasData or hasMetaData is used before get or set. If cache results, won't have to read in header from data block.

Author:

Bryan Smith - bryanesmith@gmail.com

Field Summary

static int

CACHE_ENTRY_SIZE The number of entries to keep in memory for data or meta data chunks.

Constructor Summary

DataBlockCache()

Method Summary

void	add(DataBlockCacheEntry e, boolean isMetaData) Add a DataBlockCacheEntry to the cache.
void	clear() Clear out the cache resources.
DataBlockCacheEntry	get(BigHash hash, boolean isMetaData) Returns the DataBlockCacheEntry from the cache if exists, or null if not there.
void	remove(BigHash h, boolean isMetaData) Remove a specific DataBlockCacheEntry from the cache, if there.

Methods inherited from class java.lang.Object

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

Field Detail

CACHE_ENTRY_SIZE

public static final int CACHE_ENTRY_SIZE

The number of entries to keep in memory for data or meta data chunks.

See Also:

Constant Field Values

Constructor Detail

DataBlockCache

public DataBlockCache()

Method Detail

add

public void add(DataBlockCacheEntry e,
                boolean isMetaData)

Add a DataBlockCacheEntry to the cache. Removes oldest entries if maximum size is exceeded.

Parameters:

e -

isMetaData -

get

public DataBlockCacheEntry get(BigHash hash,
                               boolean isMetaData)
                        throws AssertionFailedException,
                               java.lang.Exception

Returns the DataBlockCacheEntry from the cache if exists, or null if not there.

Parameters:

hash -

isMetaData -

Returns:

Throws:

AssertionFailedException

java.lang.Exception

clear

public void clear()

Clear out the cache resources.

remove

public void remove(BigHash h,
                   boolean isMetaData)

Remove a specific DataBlockCacheEntry from the cache, if there. Otherwise, do nothing.

Parameters:

h -

isMetaData -