org.jboss.cache.loader
Class JDBCCacheLoader

java.lang.Object
  org.jboss.cache.loader.AbstractCacheLoader
      org.jboss.cache.loader.AdjListJDBCCacheLoader
          org.jboss.cache.loader.JDBCCacheLoader

All Implemented Interfaces:

CacheLoader

@ThreadSafe
public class JDBCCacheLoader
extends AdjListJDBCCacheLoader

JDBC implementation of AdjListJDBCCacheLoader. Represents a faster alternative than JDBCCacheLoaderOld and relies on the same database structrure. It is backward compatible with data created by existing JDBCCacheLoaderOld implemetation. All configuration elements described there JDBCCacheLoaderOld also apply for this implementation.

Additional configuration info:
cache.jdbc.sql-concat : DBMS specific function for concat strings. Most likely this will be concat(1,2), but might be different for proprietary systems.

Version:

1.0

Author:

Mircea.Markus@iquestint.com, Galder Zamarreno

Field Summary

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

cf, driverName, lock, NULL_NODE_IN_ROW

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

cache, regionManager, transactions

Constructor Summary

JDBCCacheLoader()

Method Summary

CacheLoaderConfig.IndividualCacheLoaderConfig	getConfig() Gets the configuration.
protected org.apache.commons.logging.Log	getLogger()
int	getNodeCount() Returns a number representing the count of persisted children.
protected void	getNodeDataList(Fqn fqn, java.util.List<NodeData> list) Subscribes to contract.
protected AdjListJDBCCacheLoaderConfig	processConfig(CacheLoaderConfig.IndividualCacheLoaderConfig base) Builds a AdjListJDBCCacheLoaderConfig based on the supplied base config.
void	put(Fqn name, java.util.Map attributes) As per interface's contract.
java.lang.Object	put(Fqn name, java.lang.Object key, java.lang.Object value) As per interface's contract.
void	remove(Fqn fqn) As per interface's contrect.
void	start() Start is overwritten for the sake of backward compatibility only.

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

commit, exists, get, getChildrenNames, getDriverName, insertNode, loadNode, marshall, prepare, remove, removeData, reportAndRethrowError, rollback, safeClose, safeClose, safeClose, setConfig, stop, tableExists, unmarshall, updateNode

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

create, destroy, getMarshaller, loadEntireState, loadState, loadStateHelper, put, put, setCache, setRegionManager, storeEntireState, storeState

Methods inherited from class java.lang.Object

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

Constructor Detail

JDBCCacheLoader

public JDBCCacheLoader()

Method Detail

processConfig

protected AdjListJDBCCacheLoaderConfig processConfig(CacheLoaderConfig.IndividualCacheLoaderConfig base)

Builds a AdjListJDBCCacheLoaderConfig based on the supplied base config.

Specified by:

processConfig in class AdjListJDBCCacheLoader

put

public java.lang.Object put(Fqn name,
                            java.lang.Object key,
                            java.lang.Object value)
                     throws java.lang.Exception

As per interface's contract. Performance Note: Optimised O(nodeDepth) db calls.

Throws:

java.lang.Exception

put

public void put(Fqn name,
                java.util.Map attributes)
         throws java.lang.Exception

As per interface's contract. Performance Note: Optimised O(nodeDepth) db calls.

Parameters:

name - The fully qualified name of the node

attributes - A Map of attributes. Can be null

Throws:

java.lang.Exception

remove

public void remove(Fqn fqn)
            throws java.lang.Exception

As per interface's contrect. Performance Note: O(1) db calls.

Parameters:

fqn - the Fqn of the node

Throws:

java.lang.Exception

getNodeDataList

protected void getNodeDataList(Fqn fqn,
                               java.util.List<NodeData> list)
                        throws java.lang.Exception

Subscribes to contract. Performance Note: O(2) db calls.

Overrides:

getNodeDataList in class AbstractCacheLoader

Throws:

java.lang.Exception

getLogger

protected org.apache.commons.logging.Log getLogger()

Specified by:

getLogger in class AdjListJDBCCacheLoader

start

public void start()
           throws java.lang.Exception

Start is overwritten for the sake of backward compatibility only. Here is the issue: old implementation does not create a Fqn.ROOT if not specifically told so. As per put's contract, when calling put('/a/b/c', 'key', 'value') all parent nodes should be created up to root. Root is not created, though. The compatibility problem comes in the case of loade ENTIRE state. The implementation checks node's existence firstly, and based on that continues or not. As root is not persisted nothing is loaded etc.

Specified by:

start in interface CacheLoader

Overrides:

start in class AdjListJDBCCacheLoader

Throws:

java.lang.Exception

getNodeCount

public int getNodeCount()
                 throws java.lang.Exception

Returns a number representing the count of persisted children.

Throws:

java.lang.Exception

getConfig

public CacheLoaderConfig.IndividualCacheLoaderConfig getConfig()

Description copied from interface: CacheLoader

Gets the configuration.

Returns:

the configuration, represented by a CacheLoaderConfig.IndividualCacheLoaderConfig object.