Oracle® Coherence .NET API Reference Release 3.7.1
E22844-03

ExtractorEventTransformer is a special purpose ICacheEventTransformer implementation that transforms emitted events, extracting one or more properties from either the "OldValue" or the "NewValue".

Namespace:  Tangosol.Util.Transformer
Assembly:  Coherence (in Coherence.dll) Version: 3.7.1.23 (3.7.1.23)

Syntax

C#
public class ExtractorEventTransformer : ICacheEventTransformer, 
	IPortableObject

Remarks

This transformation will generally result in the change of the values' data type.

Example: the following code will register a listener to receive events only if the value of the "AccountBalance" property changes. The transformed event's "NewValue" will be a IList containing the "LastTransactionTime" and "AccountBalance" properties. The "OldValue" will always be null.

CopyC#
IFilter filter = new ValueChangeEventFilter("AccountBalance");
IValueExtractor extractor = new MultiExtractor("LastTransactionTime,AccountBalance");
ICacheEventTransformer transformer = new ExtractorEventTransformer(null, extractor);

cache.AddCacheListener(listener,
                       new CacheEventTransformerFilter(filter,
                                                       transformer),
                       false);

Inheritance Hierarchy

System..::.Object
  Tangosol.Util.Transformer..::.ExtractorEventTransformer

See Also