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Java Source Code / Java Documentation » Database DBMS » h2database » org.h2.util

Source Cross Reference

Class Diagram

Java Document (Java Doc)

org.h2.util .Cache

All known Subclasses:   org.h2.util .Cache2Q,  org.h2.util .CacheLRU,
Cache
public interface Cache (Code)
The cache keeps frequently used objects in the main memory.

Method Summary
void clear()
     Clear the cache.
CacheObject find(int pos)
     Get an element from the cache if it is available.
CacheObject get(int pos)
     Get an element in the cache if it is available.
ObjectArray getAllChanged()
     Get all objects in the cache that have been changed.
String getTypeName()
     Get the name of the cache type in a human readable form.
void put(CacheObject r)
     Add an element to the cache.
void remove(int pos)
     Remove an object from the cache.
void setMaxSize(int memorySize)
     Set the maximum memory to be used by this cache.
CacheObject update(int pos, CacheObject record)
     Update an element in the cache.

Method Detail
clear
void clear()(Code)
Clear the cache.

find
CacheObject find(int pos)(Code)
Get an element from the cache if it is available. This will not move the item to the front of the list.
Parameters:
  pos - the unique key of the element the element or null

get
CacheObject get(int pos)(Code)
Get an element in the cache if it is available. This will move the item to the front of the list.
Parameters:
  pos - the unique key of the element the element or null

getAllChanged
ObjectArray getAllChanged()(Code)
Get all objects in the cache that have been changed. the list of objects

getTypeName
String getTypeName()(Code)
Get the name of the cache type in a human readable form. the cache type name

put
void put(CacheObject r) throws SQLException(Code)
Add an element to the cache. Other items may fall out of the cache because of this. It is not allowed to add the same record twice.
Parameters:
  r - the object

remove
void remove(int pos)(Code)
Remove an object from the cache.
Parameters:
  pos - the unique key of the element

setMaxSize
void setMaxSize(int memorySize) throws SQLException(Code)
Set the maximum memory to be used by this cache.
Parameters:
  memorySize - in number of double words (4 bytes)

update
CacheObject update(int pos, CacheObject record) throws SQLException(Code)
Update an element in the cache. This will move the item to the front of the list.
Parameters:
  pos - the unique key of the element
Parameters:
  record - the element the element

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