org.apache.geode.connectors.jdbc

Class JdbcLoader<K,V>

java.lang.Object

org.apache.geode.connectors.jdbc.internal.AbstractJdbcCallback

org.apache.geode.connectors.jdbc.JdbcLoader<K,V>

All Implemented Interfaces:

CacheCallback, CacheLoader<K,V>, Declarable

@Experimental
public class JdbcLoader<K,V>
extends org.apache.geode.connectors.jdbc.internal.AbstractJdbcCallback
implements CacheLoader<K,V>

This class provides loading from a data source using JDBC.

Since:

Geode 1.4

Field Summary

Fields inherited from class org.apache.geode.connectors.jdbc.internal.AbstractJdbcCallback

cache

Constructor Summary

Constructors

Constructor and Description
JdbcLoader()

Method Summary

Modifier and Type	Method and Description
V	load(LoaderHelper<K,V> helper) Loads a value.

Methods inherited from class org.apache.geode.connectors.jdbc.internal.AbstractJdbcCallback

checkInitialized, eventCanBeIgnored, getSqlHandler

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.geode.cache.CacheCallback

close

Methods inherited from interface org.apache.geode.cache.Declarable

init, initialize

Constructor Detail

JdbcLoader

public JdbcLoader()

Method Detail

load

public V load(LoaderHelper<K,V> helper)
       throws CacheLoaderException

Description copied from interface: CacheLoader

Loads a value. Application writers should implement this method to customize the loading of a value. This method is called by the caching service when the requested value is not in the cache. Any exception (including an unchecked exception) thrown by this method is propagated back to and thrown by the invocation of Region.get(Object, Object) that triggered this load.

Specified by:

load in interface CacheLoader<K,V>

Parameters:

helper - a LoaderHelper object that is passed in from cache service and provides access to the key, region, argument, and netSearch.

Returns:

this method always returns a PdxInstance. It does not matter what the V generic parameter is set to.

Throws:

CacheLoaderException - if an error occurs. This exception or any other exception thrown by this method will be propagated back to the application from the get method.

See Also:

Region.get