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https://github.com/divolte/divolte-kafka-consumer
Helper for consuming Divolte events from Kafka queues and deserializing Avro records into Java objects using Avro's generated code.
https://github.com/divolte/divolte-kafka-consumer
Last synced: 3 months ago
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Helper for consuming Divolte events from Kafka queues and deserializing Avro records into Java objects using Avro's generated code.
- Host: GitHub
- URL: https://github.com/divolte/divolte-kafka-consumer
- Owner: divolte
- License: apache-2.0
- Archived: true
- Created: 2014-10-25T13:08:09.000Z (over 9 years ago)
- Default Branch: master
- Last Pushed: 2014-11-06T14:07:51.000Z (over 9 years ago)
- Last Synced: 2024-03-18T13:31:58.000Z (3 months ago)
- Language: Java
- Homepage:
- Size: 254 KB
- Stars: 15
- Watchers: 4
- Forks: 4
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Lists
- awesome-kafka - Divolte
README
Divolte Kafka Consumer
======================
Helper library for writing Kafka consumers that process events created by [Divolte Collector](https://github.com/divolte/divolte-collector). Divolte Collector captures click stream data and translates events into Avro records which are published on Kafka topics. The contents of these messages are the raw bytes produced by serializing the Avro records. This library allows to create consumers for these events in Java in a typesafe manner with minimal boilerplate.
To use the consumer, you need to generate Java code from your Avro schema. See [divolte-examples/avro-schema](https://github.com/divolte/divolte-examples/tree/master/avro-schema) for an example of a project that uses Maven to build a jar with generated code from a schema.
## Usage
Example consumer code:
```java
public class ConsumerExample {
// Event handler that prints records to stdout
static class MyEventHandler implements SimpleEventHandler {
@Override
public void handle(MyEventRecord event) throws Exception {
System.out.println(event);
}
}
// Supplier of event handler instances
static class MyEventHandlerSupplier implements Supplier> {
@Override
public SimpleEventHandler get() {
return new MyEventHandler();
}
}
public static void main(String[] args) {
// Create the consumer
// MyEventRecord is generated by the Avro Java code generator
DivolteKafkaConsumer consumer = DivolteKafkaConsumer.createConsumerWithSimpleHandler(
"divolte", // Kafka topic
"zk1:2181,zk2:2181,zk3:2181", // Zookeeper quorum hosts + ports
"my-consumer-group", // Kafka consumer group ID
2, // Number of threads for this consumer instance
new MyEventHandlerSupplier(), // Supplier of event handler instances
MyEventRecord.getClassSchema()); // Avro schema
// Add a shutdown hook that stops the consumer
// This handles CTRL+C or kill
Runtime.getRuntime().addShutdownHook(new Thread(
new Runnable() {
@Override
public void run() {
consumer.shutdownConsumer();
}
}));
// Start the consumer
consumer.startConsumer();
}
}
```
If you are using Java 8, the above example can be condensed to this:
```java
public class ConsumerExample {
public static void main(String[] args) {
// Create the consumer
DivolteKafkaConsumer consumer = DivolteKafkaConsumer.createConsumerWithSimpleHandler(
"divolte", // Kafka topic
"zk1:2181,zk2:2181,zk3:2181", // Zookeeper quorum hosts + ports
"my-consumer-group", // Kafka consumer group ID
2, // Number of threads for this consumer instance
() -> (e) -> System.out.println(e), // Supplier of event handler instances
MyEventRecord.getClassSchema()); // Avro schema
// Add a shutdown hook that stops the consumer
// This handles CTRL+C or kill
Runtime
.getRuntime()
.addShutdownHook(
new Thread(consumer::shutdownConsumer)
);
// Start the consumer
consumer.startConsumer();
}
}
```
For a more complete usage example, have a look at [divolte-examples/tcp-kafka-consumer](https://github.com/divolte/divolte-examples/tree/master/tcp-kafka-consumer).
## Build from source
We use [Gradle](http://www.gradle.org/) as a build tool. You need Java 7 or higher to build.
To build from source on your machine:
```sh
# cd into your preferred working dir
git clone https://github.com/divolte/divolte-kafka-consumer.git
cd divolte-kafka-consumer
# build the source
./gradlew build
# generate Eclipse project files
./gradlew eclipse
# install into your local Maven repository
./gradlew install
```