org.apache.jcs.auxiliary.disk.jdbc
Class JDBCDiskCacheManagerAbstractTemplate

java.lang.Object
  org.apache.jcs.auxiliary.disk.AbstractDiskCacheManager
      org.apache.jcs.auxiliary.disk.jdbc.JDBCDiskCacheManagerAbstractTemplate

All Implemented Interfaces:

AuxiliaryCacheManager

Direct Known Subclasses:

JDBCDiskCacheManager, MySQLDiskCacheManager

public abstract class JDBCDiskCacheManagerAbstractTemplate
extends AbstractDiskCacheManager

This class serves as an abstract template for JDBCDiskCache Manager. The MySQL JDBC Disk Cache needs many of the same features as the generic manager.

Author:

Aaron Smuts

clients

protected static int clients

Incremented on getIntance, decremented on release.

caches

protected static Hashtable<String,JDBCDiskCache<? extends Serializable,? extends Serializable>> caches

A map of JDBCDiskCache objects to region names.

tableStates

protected static Hashtable<String,TableState> tableStates

A map of TableState objects to table names. Each cache has a table state object, which is used to determine if any long processes such as deletes or optimizations are running.

JDBCDiskCacheManagerAbstractTemplate

public JDBCDiskCacheManagerAbstractTemplate()

createJDBCDiskCache

protected abstract <K extends Serializable,V extends Serializable> JDBCDiskCache<K,V> createJDBCDiskCache(JDBCDiskCacheAttributes cattr,
                                                                                                          TableState tableState)

Children must implement this method.

Parameters:

cattr -

tableState - An object used by multiple processes to indicate state.

Returns:

AuxiliaryCache -- a JDBCDiskCache

getCache

public <K extends Serializable,V extends Serializable> JDBCDiskCache<K,V> getCache(JDBCDiskCacheAttributes cattr)

Creates a JDBCDiskCache for the region if one doesn't exist, else it returns the pre-created instance. It also adds the region to the shrinker thread if needed.

Parameters:

cattr -

Returns:

The cache value

createShrinkerWhenNeeded

protected void createShrinkerWhenNeeded(JDBCDiskCacheAttributes cattr,
                                        AuxiliaryCache<?,?> raf)

If UseDiskShrinker is true then we will create a shrinker daemon if necessary.

Parameters:

cattr -

raf -

freeCache

public void freeCache(String name)

Parameters:

name -

release

public void release()

Disposes of all regions.