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adamw/streams1.java

Created March 1, 2018 16:45
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streams1.java
KStreamBuilder builder = new KStreamBuilder();
builder.stream(keySerde, valueSerde, "my_entity_events")
.groupByKey(keySerde, valueSerde)
// the folding function: should return the new state
.reduce((currentState, event) -> ..., "my_entity_store");
.toStream(); // yields a stream of intermediate states
return builder;
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