Examples with CUSTOMERS io.confluent.examples.streams.microservices.domain.Schemas.Topics.CUSTOMERS used on opensource projects

Example 1 with CUSTOMERS

use of io.confluent.examples.streams.microservices.domain.Schemas.Topics.CUSTOMERS in project kafka-streams-examples by confluentinc.

the class EmailService method processStreams.

private KafkaStreams processStreams(final String bootstrapServers, final String stateDir) {
    KStreamBuilder builder = new KStreamBuilder();
    // Create the streams/tables for the join
    KStream<String, Order> orders = builder.stream(ORDERS.keySerde(), ORDERS.valueSerde(), ORDERS.name());
    KStream<String, Payment> payments = builder.stream(PAYMENTS.keySerde(), PAYMENTS.valueSerde(), PAYMENTS.name());
    GlobalKTable<Long, Customer> customers = builder.globalTable(CUSTOMERS.keySerde(), CUSTOMERS.valueSerde(), CUSTOMERS.name());
    // Rekey payments to be by OrderId for the windowed join
    payments = payments.selectKey((s, payment) -> payment.getOrderId());
    // Join the two streams and the table then send an email for each
    orders.join(payments, EmailTuple::new, // Join Orders and Payments streams
    JoinWindows.of(1 * MIN), serdes).join(customers, (key1, tuple) -> tuple.order.getCustomerId(), // note how, because we use a GKtable, we can join on any attribute of the Customer.
    (tuple, customer) -> tuple.setCustomer(customer)).peek((key, emailTuple) -> emailer.sendEmail(emailTuple));
    return new KafkaStreams(builder, baseStreamsConfig(bootstrapServers, stateDir, APP_ID));
}