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zeebe-hazelcast-exporter

Export records from Zeebe to Hazelcast. Hazelcast is an in-memory data grid which is used here as a message topic.

How it works

The exporter provides an easy way to connect multiple applications to Zeebe. For example, an application can use the exporter to send a notification when a new incident is created. Without the exporter, the application needs to implement its own exporter.

Usage

Java Application

Add the Maven dependency to your pom.xml

<dependency>
	<groupId>io.zeebe.hazelcast</groupId>
	<artifactId>zeebe-hazelcast-connector</artifactId>
	<version>%{VERSION}</version>
</dependency>

Connect to Hazelcast and register a listener

ClientConfig clientConfig = new ClientConfig();
clientConfig.getNetworkConfig().addAddress("127.0.0.1:5701");
HazelcastInstance hz = HazelcastClient.newHazelcastClient(clientConfig);

final ZeebeHazelcast zeebeHazelcast = new ZeebeHazelcast(hz);

zeebeHazelcast.addWorkflowInstanceListener(workflowInstance -> {
    // ...
});

C# Application

Add the nuget package zeebe hazelcast connector(???) to your project.

Example usage:

    // Start the Hazelcast Client and connect to an already running Hazelcast Cluster on 127.0.0.1
    var hz = HazelcastClient.NewHazelcastClient();
    // Get a Topic called "zeebe-deployments"
    var topic = hz.GetTopic<byte[]>("zeebe-deployments");

     // Add a Listener to the Topic
    DeploymentListener.Consumer consumer = (record) => Console.WriteLine(record.ToString());
    topic.AddMessageListener(new DeploymentListener(consumer));

Install

Before you start the broker, copy the exporter JAR into the lib folder of the broker.

cp exporter/target/zeebe-hazelcast-exporter-%{VERSION}-jar-with-dependencies.jar ~/zeebe-broker-%{VERSION}/lib/

Register the exporter in the Zeebe configuration file ~/zeebe-broker-%{VERSION}/config/zeebe.cfg.toml.

[[exporters]]
id = "hazelcast"
className = "io.zeebe.hazelcast.exporter.HazelcastExporter"

Now start the broker and the applications.

Configuration

In the Zeebe configuration file, you can change

  • the Hazelcast port
  • the topic name prefix
  • the value and record types which are exported

Default values:

[[exporters]]
id = "hazelcast"
className = "io.zeebe.hazelcast.exporter.HazelcastExporter"

    [exporters.args]
    # Hazelcast port
    port = 5701
    
    # Hazelcast topic prefix
    topicPrefix = "zeebe-"
    
    # comma separated list of io.zeebe.protocol.record.ValueType
    enabledValueTypes = "JOB,WORKFLOW_INSTANCE,DEPLOYMENT,INCIDENT"
    
    # comma separated list of io.zeebe.protocol.record.RecordType
    enabledRecordTypes = "EVENT"
    
    # If true, the exporter update its position after publish the record to Hazelcast.
    # Otherwise, it never update its position. On broker start, it will always start from the begin of the log. 
    # CAUTION! The broker can't delete data and may run out of disk space if set to false. 
    updatePosition = true

Build it from Source

The exporter and the Java connector can be built with Maven

mvn clean install

Code of Conduct

This project adheres to the Contributor Covenant Code of Conduct. By participating, you are expected to uphold this code. Please report unacceptable behavior to [email protected].