Redis EPH Checkpoints

Use a Redis database for checkpoints with using the Azure Event Processor Host (EPH) for Azure Event Hubs.

Add to your project

Add the repository URL to your pom.xml file.

<repository>
    <snapshots>
        <enabled>false</enabled>
    </snapshots>
    <id>bintray-davesters-java</id>
    <name>bintray</name>
    <url>https://dl.bintray.com/davesters/java</url>
</repository>

Add the depedency to your pom.xml file.

<dependency>
    <groupId>com.github.davesters</groupId>
    <artifactId>redis-eph-checkpoints</artifactId>
    <version>[LATEST VERSION]</version>
</dependency>

Example Usage

MetadataEventProcessorFactory eventProcessorFactory = context.createBean(YourProcessorFactoryClass.class);

String processorHostName = EventProcessorHost.createHostName("hostname");
RedisCheckpointOptions options = new RedisCheckpointOptions(processorHostName, "redis.host.name");
options.setCheckpointKeyName(processorHostName); // Required option
options.setLeaseDurationInMillis(45 * 1000); // Set to 45 seconds if you want. Defaults to 30 seconds.
options.setPassword("password");
options.setSsl(true);

RedisCheckpointLeaseManager checkpointLeaseManager = new RedisCheckpointLeaseManager(options);

eventProcessorHost = EventProcessorHost.EventProcessorHostBuilder
  .newBuilder(hostName, "consumer-group")
  .useUserCheckpointAndLeaseManagers(checkpointLeaseManager, checkpointLeaseManager)
  .useEventHubConnectionString("connection-string")
  .build();

PartitionManagerOptions partitionManagerOptions = new PartitionManagerOptions();
partitionManagerOptions.setLeaseDurationInSeconds(45); // Maybe want to set this to match the lease duration set above
partitionManagerOptions.setLeaseRenewIntervalInSeconds(30); // Probably want to set this to a number below the lease duration
eventProcessorHost.setPartitionManagerOptions(partitionManagerOptions);

eventProcessorHost.registerEventProcessorFactory(eventProcessorFactory, options).get();

Be sure to look at the RedisCheckpointOptions class for other available options and their descriptions.