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Updated versions, replaced Spring Cloud Streams by Spring Kafka, remo…
…ved C7 from Kafka example (related to #73)
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84 changes: 50 additions & 34 deletions
84
kafka/java/checkout/src/main/java/io/flowing/retail/checkout/messages/MessageSender.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,34 +1,50 @@ | ||
| package io.flowing.retail.checkout.messages; | ||
|
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| import org.springframework.beans.factory.annotation.Autowired; | ||
| import org.springframework.cloud.stream.annotation.EnableBinding; | ||
| import org.springframework.cloud.stream.messaging.Source; | ||
| import org.springframework.integration.support.MessageBuilder; | ||
| import org.springframework.messaging.MessageChannel; | ||
| import org.springframework.stereotype.Component; | ||
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| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule; | ||
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| @Component | ||
| @EnableBinding(Source.class) | ||
| public class MessageSender { | ||
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| @Autowired | ||
| private MessageChannel output; | ||
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| @Autowired | ||
| private ObjectMapper objectMapper; | ||
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| public void send(Message<?> m) { | ||
| try { | ||
| // avoid too much magic and transform ourselves | ||
| String jsonMessage = objectMapper.writeValueAsString(m); | ||
| // wrap into a proper message for the transport (Kafka/Rabbit) and send it | ||
| output.send( | ||
| MessageBuilder.withPayload(jsonMessage).setHeader("type", m.getType()).build()); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException("Could not tranform and send message due to: "+ e.getMessage(), e); | ||
| } | ||
| } | ||
| } | ||
| package io.flowing.retail.checkout.messages; | ||
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| import com.fasterxml.jackson.databind.ObjectMapper; | ||
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| import org.apache.kafka.clients.admin.NewTopic; | ||
| import org.apache.kafka.clients.producer.ProducerRecord; | ||
| import org.springframework.beans.factory.annotation.Autowired; | ||
| import org.springframework.beans.factory.annotation.Value; | ||
| import org.springframework.context.annotation.Bean; | ||
| import org.springframework.kafka.config.TopicBuilder; | ||
| import org.springframework.kafka.core.KafkaTemplate; | ||
| import org.springframework.stereotype.Component; | ||
|
|
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| /** | ||
| * Helper to send messages, currently nailed to Kafka, but could also send via AMQP (e.g. RabbitMQ) or | ||
| * any other transport easily | ||
| */ | ||
| @Component | ||
| public class MessageSender { | ||
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| @Value( "${flowing-retail.topic-name:flowing-retail}") | ||
| public String topicName; | ||
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| @Autowired | ||
| private KafkaTemplate<String, String> kafkaTemplate; | ||
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| @Autowired | ||
| private ObjectMapper objectMapper; | ||
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| @Bean | ||
| public NewTopic autoCreateTopicOnStartupIfNotExistant() { | ||
| return TopicBuilder.name(topicName).partitions(1).replicas(1).build(); | ||
| } | ||
|
|
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| public void send(Message<?> m) { | ||
| try { | ||
| // avoid too much magic and transform ourselves | ||
| String jsonMessage = objectMapper.writeValueAsString(m); | ||
|
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| // wrap into a proper message for Kafka including a header | ||
| ProducerRecord<String, String> record = new ProducerRecord<String, String>("flowing-retail", jsonMessage); | ||
| record.headers().add("type", m.getType().getBytes()); | ||
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| // and send it | ||
| kafkaTemplate.send(record); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException("Could not transform and send message: "+ e.getMessage(), e); | ||
| } | ||
| } | ||
| } |
8 changes: 4 additions & 4 deletions
8
kafka/java/checkout/src/main/resources/application.properties
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,7 +1,7 @@ | ||
| spring.cloud.stream.bindings.output.destination=flowing-retail | ||
| spring.cloud.stream.bindings.output.content-type=application/json | ||
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| spring.cloud.stream.kafka.binder.zkNodes=localhost:2181 | ||
| spring.cloud.stream.kafka.binder.brokers=localhost:29092 | ||
| # Kafka | ||
| flowing-retail.topic-name=flowing-retail | ||
| spring.kafka.bootstrap-servers=localhost:29092 | ||
| spring.kafka.consumer.auto-offset-reset=earliest | ||
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| server.port = 8091 |
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43 changes: 29 additions & 14 deletions
43
kafka/java/inventory/src/main/java/io/flowing/retail/inventory/messages/MessageSender.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,33 +1,48 @@ | ||
| package io.flowing.retail.inventory.messages; | ||
|
|
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| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import org.apache.kafka.clients.admin.NewTopic; | ||
| import org.apache.kafka.clients.producer.ProducerRecord; | ||
| import org.springframework.beans.factory.annotation.Autowired; | ||
| import org.springframework.cloud.stream.annotation.EnableBinding; | ||
| import org.springframework.cloud.stream.messaging.Source; | ||
| import org.springframework.integration.support.MessageBuilder; | ||
| import org.springframework.messaging.MessageChannel; | ||
| import org.springframework.beans.factory.annotation.Value; | ||
| import org.springframework.context.annotation.Bean; | ||
| import org.springframework.kafka.config.TopicBuilder; | ||
| import org.springframework.kafka.core.KafkaTemplate; | ||
| import org.springframework.stereotype.Component; | ||
|
|
||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
|
|
||
| /** | ||
| * Helper to send messages, currently nailed to Kafka, but could also send via AMQP (e.g. RabbitMQ) or | ||
| * any other transport easily | ||
| */ | ||
| @Component | ||
| @EnableBinding(Source.class) | ||
| public class MessageSender { | ||
|
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| public static final String TOPIC_NAME = "flowing-retail"; | ||
|
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| @Autowired | ||
| private MessageChannel output; | ||
|
|
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| private KafkaTemplate<String, String> kafkaTemplate; | ||
| @Autowired | ||
| private ObjectMapper objectMapper; | ||
| private ObjectMapper objectMapper; | ||
|
|
||
| @Bean | ||
| public NewTopic autoCreateTopicOnStartupIfNotExistant() { | ||
| return TopicBuilder.name(TOPIC_NAME).partitions(1).replicas(1).build(); | ||
| } | ||
|
|
||
| public void send(Message<?> m) { | ||
| try { | ||
| // avoid too much magic and transform ourselves | ||
| String jsonMessage = objectMapper.writeValueAsString(m); | ||
| // wrap into a proper message for the transport (Kafka/Rabbit) and send it | ||
| output.send( | ||
| MessageBuilder.withPayload(jsonMessage).setHeader("type", m.getType()).build()); | ||
|
|
||
| // wrap into a proper message for Kafka including a header | ||
| ProducerRecord<String, String> record = new ProducerRecord<String, String>("flowing-retail", jsonMessage); | ||
| record.headers().add("type", m.getType().getBytes()); | ||
|
|
||
| // and send it | ||
| kafkaTemplate.send(record); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException("Could not tranform and send message due to: "+ e.getMessage(), e); | ||
| throw new RuntimeException("Could not transform and send message: "+ e.getMessage(), e); | ||
| } | ||
| } | ||
| } |
11 changes: 4 additions & 7 deletions
11
kafka/java/inventory/src/main/resources/application.properties
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,5 @@ | ||
| spring.cloud.stream.bindings.output.destination=flowing-retail | ||
| spring.cloud.stream.bindings.output.content-type=application/json | ||
| spring.cloud.stream.bindings.input.destination=flowing-retail | ||
| spring.cloud.stream.bindings.input.content-type=application/json | ||
| spring.cloud.stream.bindings.input.group=inventory | ||
| spring.application.name=inventory | ||
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| spring.cloud.stream.kafka.binder.zkNodes=localhost:2181 | ||
| spring.cloud.stream.kafka.binder.brokers=localhost:29092 | ||
| # Kafka | ||
| spring.kafka.bootstrap-servers=localhost:29092 | ||
| spring.kafka.consumer.auto-offset-reset=earliest |
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