Event Driven Systems with Spring Boot, Spring Cloud Streams and Kafka
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Spring Connect Charlotte Event Driven Systems with Spring Boot, Spring Cloud Streams and Kafka Speakers: Rohini Rajaram & Mayuresh Krishna
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Event Driven Systems with Spring Boot, Spring Cloud Streams and Kafka
- 5. Events As Continuous Streams Business Transactions Future Of Data Stored As Events Reconstruct A Shopping Cart Shopping Cart Time Constrained State Store Future Of Data
- 13. Publish & Subscribe To Events Store Events Process & Analyze Events
- 18. Relational Data Store Stream Processing Capture Transactions Real Time Aggregations Publish Results
- 23. Properties config = new Properties(); config.put(StreamsConfig.APPLICATION_ID_CONFIG, "streams-starter-app"); config.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "server-lb:9092"); config.put(StreamsConfig.DEFAULT_KEY_SERDE_CLASS_CONFIG, Serdes.String().getClass()); config.put(StreamsConfig.DEFAULT_VALUE_SERDE_CLASS_CONFIG, Serdes.String().getClass()); KStreamBuilder builder = new KStreamBuilder(); KStream<String, String> kStream = builder.stream("input-topic-name"); // do stuff kStream.to("word-count-output"); KafkaStreams streams = new KafkaStreams(builder, config); streams.start(); // Do aggregation making the word as the key and count as the value // shutdown hook to correctly close the streams application Runtime.getRuntime().addShutdownHook(new Thread(streams::close));
- 24. 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 P0 P1 P2 Writes Topic Logs
- 25. spring.cloud.stream.kafka.binder.brokers=<Broker LB> spring.cloud.stream.kafka.streams.binder.configuration.default.key.serde=or g.apache.kafka.common.serialization.Serdes$StringSerde spring.cloud.stream.kafka.streams.binder.configuration.default.value.serde =org.apache.kafka.common.serialization.Serdes$StringSerde spring.cloud.stream.bindings.input.destination=input-topic-name @StreamListener @SendTo (Binding.OUTPUT) public KStream<String, Integer> wordCountProcessing ( @Input (Binding.INPUT) KStream<String, String> wordStream) { }
- 26. Maven Dependency: <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-stream-binder-kafka</artifactId> </dependency> Code: /** * Constructor with bindings to the output channel for the order topic * @param binding */ public OrderService(ResourceBinding binding) { this.orderOut = binding.orderOut(); } public String createOrder(OrderDTO orderDTO) { orderOut.send(MessageBuilder.withPayload(order).setHeader("kafka_message Key", order.getOrderID()).build());
- 29. Topic A Partition 0 Topic A Partition 0 Producer Consumer
- 33. lineItemStream = orderEventStream .filter((key, value) -> value.getState().equals(State.placed)) .flatMapValues(value -> value.getLineItems()) .selectKey((orderId, lineItem) -> lineItem.getSku().toString()) .join(inventoryStream, new KeyValueMapper<String, LineItem, String>() { @Override public String apply(String key, LineItem value) { log.info("Sku Key " + key.toString()); return key; } }, new ValueJoiner<LineItem, Inventory, LineItem>() { @Override public LineItem apply(LineItem value1, Inventory value2) { if (value2.getQuantity() > 0) { value1.setState(LineItemState.validated); } else { value1.setState(LineItemState.insufficient_inventory); } return value1; } });
- 36. Name Account Balance Alice $100 Bob $200 Domain Event Alice gives Bob $50 Bob give Alice $100 Name Account Balance Alice $150 Bob $150 Change Log Event Stream Alice’s Acct. Balance is $50 Bob’s Acct. Balance is $250 Alice’s Acct. Balance is $150 Bob’s Acct Balance is $150 Current State