com.neurosys.modules.etl

Class SpringCacheTransformer

java.lang.Object

com.neurosys.modules.etl.SpringCacheTransformer

All Implemented Interfaces:

org.apache.commons.collections.Transformer, org.springframework.beans.factory.Aware, org.springframework.beans.factory.BeanNameAware

public class SpringCacheTransformer
extends Object
implements org.apache.commons.collections.Transformer, org.springframework.beans.factory.BeanNameAware

Uses a CacheManager to fetch data from a Cache. The cache key name can be derived from the input to the Transformer or even using the BeanNameAware for the instance. One can override #getCacheKeyName() to override the algorithm to derive the key.

Author:

Arjun Dhar TODO: Add unit test case for input not Array and using #accessorTransformer

Constructor Summary

Constructors

Constructor and Description
SpringCacheTransformer()

Method Summary

Modifier and Type	Method and Description
protected boolean	fetchFreshContent(org.springframework.cache.Cache.ValueWrapper vw) When should one attempt a fetch.
org.apache.commons.collections.Transformer	getCacheKeyAccessorTransformer() If Not null, will assume input not to be an array and will assign the cache key to be the name derived from this transformer.
String	getCacheKeyName(Object input)
org.springframework.cache.CacheManager	getCacheManager()
String	getCacheName()
org.apache.commons.collections.Transformer	getTransformer() The Transformer that will take the input and get the results if no cache or result is available for the requested key defined by #getCacheKeyName()
void	setBeanName(String beanName)
void	setCacheKeyAccessorTransformer(org.apache.commons.collections.Transformer cacheKeyAccessorTransformer) If Not null, will assume input not to be an array and will assign the cache key to be the name derived from this transformer.
void	setCacheManager(org.springframework.cache.CacheManager cacheManager)
void	setCacheName(String cacheName)
void	setTransformer(org.apache.commons.collections.Transformer transformer) The Transformer that will take the input and get the results if no cache or result is available for the requested key defined by #getCacheKeyName()
Object	transform(Object input) The input represents the parameters to the Query; as Object[] array

Methods inherited from class java.lang.Object

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

Constructor Detail

SpringCacheTransformer

public SpringCacheTransformer()

Method Detail

transform

@Transactional
public Object transform(Object input)

The input represents the parameters to the Query; as Object[] array

Specified by:

transform in interface org.apache.commons.collections.Transformer

Parameters:

input - as Object[] @nullable true

fetchFreshContent

protected boolean fetchFreshContent(org.springframework.cache.Cache.ValueWrapper vw)

When should one attempt a fetch. Override to customize
Default behavior is to fetch if no Cache item or cache value is null

getCacheKeyName

public String getCacheKeyName(Object input)

setBeanName

public void setBeanName(String beanName)

Specified by:

setBeanName in interface org.springframework.beans.factory.BeanNameAware

getCacheManager

public org.springframework.cache.CacheManager getCacheManager()

setCacheManager

public void setCacheManager(org.springframework.cache.CacheManager cacheManager)

getCacheName

public String getCacheName()

setCacheName

public void setCacheName(String cacheName)

getTransformer

public org.apache.commons.collections.Transformer getTransformer()

The Transformer that will take the input and get the results if no cache or result is available for the requested key defined by #getCacheKeyName()

setTransformer

public void setTransformer(org.apache.commons.collections.Transformer transformer)

The Transformer that will take the input and get the results if no cache or result is available for the requested key defined by #getCacheKeyName()

getCacheKeyAccessorTransformer

public org.apache.commons.collections.Transformer getCacheKeyAccessorTransformer()

If Not null, will assume input not to be an array and will assign the cache key to be the name derived from this transformer.

Can be null:

true

Default value:

null

setCacheKeyAccessorTransformer

public void setCacheKeyAccessorTransformer(org.apache.commons.collections.Transformer cacheKeyAccessorTransformer)

If Not null, will assume input not to be an array and will assign the cache key to be the name derived from this transformer.

Can be null:

true

Default value:

null