org.apache.ignite.stream

Class StreamTransformer<K,V>

java.lang.Object

org.apache.ignite.stream.StreamTransformer<K,V>

All Implemented Interfaces:

Serializable, javax.cache.processor.EntryProcessor<K,V,Object>, StreamReceiver<K,V>

public abstract class StreamTransformer<K,V>
extends Object
implements StreamReceiver<K,V>, javax.cache.processor.EntryProcessor<K,V,Object>

Convenience adapter to transform update existing values in streaming cache based on the previously cached value.

This transformer implement EntryProcessor and internally will call IgniteCache.invoke(Object, EntryProcessor, Object...) method. Note that the value received from the data streamer will be passed to the entry processor as an argument.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
StreamTransformer()

Method Summary

Modifier and Type	Method and Description
static <K,V> StreamTransformer<K,V>	from(CacheEntryProcessor<K,V,Object> ep) Creates a new transformer based on instance of CacheEntryProcessor.
void	receive(IgniteCache<K,V> cache, Collection<Map.Entry<K,V>> entries) Updates cache with batch of entries.

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.cache.processor.EntryProcessor

process

Constructor Detail

StreamTransformer

public StreamTransformer()

Method Detail

receive

public void receive(IgniteCache<K,V> cache,
                    Collection<Map.Entry<K,V>> entries)
             throws IgniteException

Updates cache with batch of entries.

Specified by:

receive in interface StreamReceiver<K,V>

Parameters:

cache - Cache.

entries - Collection of entries.

Throws:

IgniteException - If failed.

from

public static <K,V> StreamTransformer<K,V> from(CacheEntryProcessor<K,V,Object> ep)

Creates a new transformer based on instance of CacheEntryProcessor.

Type Parameters:

K - Cache key type.

V - Cache value type.

Parameters:

ep - Entry processor.

Returns:

Stream transformer.