org.mmbase.cache
Class BlobCache

java.lang.Object
  org.mmbase.cache.Cache<String,Object>
      org.mmbase.cache.BlobCache

All Implemented Interfaces:

Map<String,Object>, CacheMBean, SizeMeasurable

public abstract class BlobCache
extends Cache<String,Object>

The 'blob cache' is used in MMObjectNode to cache small byte-array field values. it is a replacement for the 'handle cache' which was present in MMBase <1.8.

Since:

MMBase 1.8

Version:

$Id: BlobCache.java 36125 2009-06-18 09:39:38Z michiel $

Author:

Michiel Meeuwissen

Nested Class Summary

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Field Summary

Fields inherited from class org.mmbase.cache.Cache

lock, maxEntrySize

Constructor Summary

BlobCache(int size)

Method Summary

protected int	getDefaultMaxEntrySize() This has to be overridden by Caches which support max entry size.
String	getDescription() Gives a description for this cache type.
String	getKey(int nodeNumber, String fieldName)
String	getName() Returns a name for this cache type.
Object	put(String key, Object value) Like 'put' of LRUHashtable but considers if the cache is active or not.

Methods inherited from class org.mmbase.cache.Cache

checkCachePolicy, clear, contains, containsKey, containsValue, entrySet, equals, get, getAvarageValueLength, getByteSize, getByteSize, getCheapByteSize, getCount, getHits, getImplementation, getLock, getMaxEntrySize, getMaxSize, getMisses, getPuts, getRatio, getSize, getStats, hashCode, isActive, isEmpty, keySet, maxSize, putAll, putCache, remove, reset, setActive, setImplementation, setMaxEntrySize, setMaxSize, size, toString, values

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

BlobCache

public BlobCache(int size)

Method Detail

getDefaultMaxEntrySize

protected int getDefaultMaxEntrySize()

Description copied from class: Cache

This has to be overridden by Caches which support max entry size.

Overrides:

getDefaultMaxEntrySize in class Cache<String,Object>

getName

public String getName()

Description copied from class: Cache

Returns a name for this cache type. Default it is the class name, but this normally will be overriden.

Specified by:

getName in interface CacheMBean

Overrides:

getName in class Cache<String,Object>

getDescription

public String getDescription()

Description copied from class: Cache

Gives a description for this cache type. This can be used in cache overviews.

Specified by:

getDescription in interface CacheMBean

Overrides:

getDescription in class Cache<String,Object>

getKey

public final String getKey(int nodeNumber,
                           String fieldName)

put

public Object put(String key,
                  Object value)

Description copied from class: Cache

Like 'put' of LRUHashtable but considers if the cache is active or not.

Specified by:

put in interface Map<String,Object>

Overrides:

put in class Cache<String,Object>