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| @Bean | |
| public KStream<?, ?> kstreamProcessorApi(StreamsBuilder streamsBuilder) { | |
| StoreBuilder<KeyValueStore<String, IotEvent>> eventStoreBuilder = | |
| Stores.keyValueStoreBuilder(Stores.persistentKeyValueStore("eventstore"), | |
| Serdes.String(), iotEventSerde()); | |
| // register store | |
| streamsBuilder.addStateStore(eventStoreBuilder); | |
| KStream<String, IotEvent> stream = streamsBuilder.stream(inputTopic, Consumed.with(Serdes.String(), iotEventSerde())); | |
| stream | |
| .process(() -> new Processor<String, IotEvent>() { | |
| private KeyValueStore<String, IotEvent> stateStore; | |
| @Override | |
| public void init(ProcessorContext context) { | |
| stateStore = (KeyValueStore<String, IotEvent>) context.getStateStore("eventstore"); | |
| context.schedule(Duration.ofMinutes(10), PunctuationType.WALL_CLOCK_TIME, timestamp -> { | |
| //iterate over all records and remove them based on some criteria | |
| stateStore.all().forEachRemaining(keyValue -> { | |
| if (keyValue.value.getEventType() == EventType.PROCESSED) { | |
| stateStore.delete(keyValue.key); | |
| } | |
| }); | |
| }); | |
| } | |
| // additional logic omitted | |
| ; | |
| return stream; | |
| } |
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