Using Kafka Streams state store in DSL and Processor API

Kafka_Streams_store_init_example.txt

//DSL API

KStream<String,Double> streamFromKafka = ....; // from kafka topic
KGroupedStream<String,Double> groupedStream = streamFromKafka.groupByKey();
//options
groupedStream.count(inMemoryKVFactory); OR
groupedStream.count(persistentKVFactory); OR

//Processor API - use TopologyBuilder to associate state stores

TopologyBuilder builder = new TopologyBuilder();
//options
builder.addStateStore(inMemoryKVFactory, "processor-1"); OR
builder.addStateStore(persistentKVFactory, "processor-1");

//get a handle to the store using ProcessorContext
ProcessorContext pc = ... ; 
KeyValueStore<String, Double> kvStateStore = (KeyValueStore<String, Double>) pc.getStateStore("my-state-store");