ecab656cc1
JIRA: https://jira.spring.io/browse/INTEXT-191 Polishing and build.gradle fix for pom generation
40 lines
2.6 KiB
Markdown
40 lines
2.6 KiB
Markdown
Apache Kafka Sample
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==============
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This example demonstrates the use Kafka **Outbound Channel Adapter** and **Message-Driven Channel Adapter**.
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It uses Java configuration for the adapters.
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## Running the sample
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Start Apache Zookeeper and Apache Kafka according to the documentation for the Apache Kafka project.
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$ gradlew :kafka:run
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This will package the application and run it using the [Gradle Application Plugin](http://www.gradle.org/docs/current/userguide/application_plugin.html)
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#### Using an IDE such as SpringSource Tool Suite™ (STS)
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In STS (Eclipse), go to package **org.springframework.integration.samples.kafka**, right-click **Application** and select **Run as** --> **Java Application** (or Spring Boot Application).
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### Output
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The application sends 10 messages (`foo0` ... `foo9`) to a kafka topic `si.topic` (which is created if necessary).
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The message-driven adapter receives the messages and places them in a `QueueChannel` which the application reads and
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writes to stdout:
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GenericMessage [payload=foo0, headers={kafka_offset=21, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=22}]
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GenericMessage [payload=foo1, headers={kafka_offset=22, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=23}]
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GenericMessage [payload=foo2, headers={kafka_offset=23, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=24}]
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GenericMessage [payload=foo3, headers={kafka_offset=24, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=25}]
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GenericMessage [payload=foo4, headers={kafka_offset=25, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=26}]
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GenericMessage [payload=foo5, headers={kafka_offset=26, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=27}]
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GenericMessage [payload=foo6, headers={kafka_offset=27, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=28}]
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GenericMessage [payload=foo7, headers={kafka_offset=28, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=29}]
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GenericMessage [payload=foo8, headers={kafka_offset=29, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=30}]
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GenericMessage [payload=foo9, headers={kafka_offset=30, kafka_messageKey=si.key, kafka_topic=si.topic, kafka_partitionId=0, kafka_nextOffset=31}]
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Notice that the offset header increases on each run (the topic is not removed, to demonstrate that the offset is retained
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between executions).
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