org.jboss.cache.loader.jdbm

Class JdbmCacheLoader2

java.lang.Object

org.jboss.cache.loader.AbstractCacheLoader

org.jboss.cache.loader.jdbm.JdbmCacheLoader

org.jboss.cache.loader.jdbm.JdbmCacheLoader2

All Implemented Interfaces:

Lifecycle, CacheLoader

@ThreadSafe
public class JdbmCacheLoader2
extends JdbmCacheLoader

Optimized version of the JdbmCacheLoader implementation which is better for storing data under a single node. Speed is improved.

Data is stored using an FQN to Map association, where the depth is prefixed to the FQN:

 0/ = NodeData
 1/node1 = Node Data
 1/node2 = Node Data
 2/node2/node3 = Node Data
 2/node2/node4 = Node Data
 

Browse operations lock the entire tree; eventually the JDBM team plans to fix this.

Version:

$Id: JdbmCacheLoader.java 7086 2008-11-05 18:39:35Z genman $

Author:

Elias Ross

Field Summary

Fields inherited from class org.jboss.cache.loader.AbstractCacheLoader

buddyFqnTransformer, cache, regionManager, transactions

Constructor Summary

Constructors

Constructor and Description
JdbmCacheLoader2()

Method Summary

Methods

Modifier and Type	Method and Description
boolean	exists(Fqn name) Returns whether the given node exists.
Map	get(Fqn name) Returns a map containing all key-value pairs for the given FQN, or null if the node is not present.

Methods inherited from class org.jboss.cache.loader.jdbm.JdbmCacheLoader

checkNonNull, checkNotOpen, create, dump, dump, getChildrenNames, getConfig, put, put, put, remove, remove, removeData, setCache, setConfig, size, start, stop, toString

Methods inherited from class org.jboss.cache.loader.AbstractCacheLoader

commit, destroy, doMarshall, doUnmarshall, getMarshaller, getNodeDataList, loadEntireState, loadState, loadStateHelper, move, prepare, put, regionAwareMarshall, regionAwareUnmarshall, rollback, setRegionManager, storeEntireState, storeState, storeStateHelper

Methods inherited from class java.lang.Object

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

Constructor Detail

JdbmCacheLoader2

public JdbmCacheLoader2()

Method Detail

get

public Map get(Fqn name)
        throws Exception

Description copied from class: JdbmCacheLoader

Returns a map containing all key-value pairs for the given FQN, or null if the node is not present. This operation is always non-transactional, even in a transactional environment.

Specified by:

get in interface CacheLoader

Overrides:

get in class JdbmCacheLoader

Parameters:

name - the Fqn to search for.

Returns:

Map keys and values for the given node. Returns null if the node is not found. If the node is found but has no attributes, this method returns an empty Map.

Throws:

Exception

exists

public boolean exists(Fqn name)
               throws IOException

Description copied from class: JdbmCacheLoader

Returns whether the given node exists.

Specified by:

exists in interface CacheLoader

Overrides:

exists in class JdbmCacheLoader

Returns:

true if node exists, false otherwise

Throws:

IOException