Examples with Product io.confluent.examples.streams.avro.microservices.Product used on opensource projects

Example 1 with Product

use of io.confluent.examples.streams.avro.microservices.Product in project kafka-streams-examples by confluentinc.

the class InventoryService method processStreams.

private KafkaStreams processStreams(final String bootstrapServers, final String stateDir) {
    // Latch onto instances of the orders and inventory topics
    StreamsBuilder builder = new StreamsBuilder();
    KStream<String, Order> orders = builder.stream(Topics.ORDERS.name(), Consumed.with(Topics.ORDERS.keySerde(), Topics.ORDERS.valueSerde()));
    KTable<Product, Integer> warehouseInventory = builder.table(Topics.WAREHOUSE_INVENTORY.name(), Consumed.with(Topics.WAREHOUSE_INVENTORY.keySerde(), Topics.WAREHOUSE_INVENTORY.valueSerde()));
    // Create a store to reserve inventory whilst the order is processed.
    // This will be prepopulated from Kafka before the service starts processing
    StoreBuilder reservedStock = Stores.keyValueStoreBuilder(Stores.persistentKeyValueStore(RESERVED_STOCK_STORE_NAME), Topics.WAREHOUSE_INVENTORY.keySerde(), Serdes.Long()).withLoggingEnabled(new HashMap<>());
    builder.addStateStore(reservedStock);
    // First change orders stream to be keyed by Product (so we can join with warehouse inventory)
    orders.selectKey((id, order) -> order.getProduct()).filter((id, order) -> OrderState.CREATED.equals(order.getState())).join(warehouseInventory, KeyValue::new, Joined.with(Topics.WAREHOUSE_INVENTORY.keySerde(), Topics.ORDERS.valueSerde(), Serdes.Integer())).transform(InventoryValidator::new, RESERVED_STOCK_STORE_NAME).to(Topics.ORDER_VALIDATIONS.name(), Produced.with(Topics.ORDER_VALIDATIONS.keySerde(), Topics.ORDER_VALIDATIONS.valueSerde()));
    return new KafkaStreams(builder.build(), MicroserviceUtils.baseStreamsConfig(bootstrapServers, stateDir, INVENTORY_SERVICE_APP_ID));
}