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//Inside our request-response thread (e.g. the webserver’s thread) | |
ReadOnlyKeyValueStore ordersStore = streams.store(“enriched-orders-store”,...); | |
ordersStore.get(orderId); |
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orders.join(customers, Tuple::new) //join customers and orders | |
.filter((k, tuple) → tuple.customer.level().equals(PLATINUM) //filter platinum customers | |
&& tuple.order.state().equals(CONFIRMED)) //only consider confirmed orders | |
.peek((k, tuple) → emailer.sendMail(tuple)); //send email for each cust/order tuple |
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//Execute query in a sidecar | |
ksql> CREATE STREAM orders (ORDERID string, ORDERTIME bigint...) WITH (kafka_topic='orders', value_format='JSON'); | |
ksql> CREATE STREAM platinum_emails as select * from orders, customers where client_level == ‘PLATINUM’ and state == ‘CONFIRMED’; |
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//In Node.js service | |
var nodemailer = require('nodemailer'); | |
… | |
var kafka = require('kafka-node'), | |
Consumer = kafka.Consumer, | |
client = new kafka.Client(), | |
consumer = new Consumer(client, [ { topic: 'platinum_emails', partition: 0 } ] ); | |
consumer.on('message', function (orderConsumerTuple) { | |
sendMail(orderConsumerTuple); |
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# Submit an order. Immediately retrieving it will block until validation completes. | |
$ curl -X POST ... --data {"id":"1"...} http://server:8081/orders/ | |
$ curl -X GET http://server:8081/orders/validated/1?timeout=500 |
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package com.confluent.benstopford; | |
import kafka.consumer.*; | |
import kafka.javaapi.consumer.ConsumerConnector; | |
import kafka.message.MessageAndMetadata; | |
import kafka.serializer.StringDecoder; | |
import kafka.server.KafkaConfig; | |
import kafka.server.KafkaServerStartable; | |
import org.apache.curator.test.TestingServer; | |
import org.apache.kafka.clients.producer.KafkaProducer; |
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