Examples with RoundRobin co.cask.cdap.api.annotation.RoundRobin used on opensource projects

Example 1 with RoundRobin

use of co.cask.cdap.api.annotation.RoundRobin in project cdap by caskdata.

the class FlowUtils method createConsumerGroupConfig.

/**
 * Creates a {@link ConsumerGroupConfig} by inspecting the given process method.
 */
public static ConsumerGroupConfig createConsumerGroupConfig(long groupId, int groupSize, Method processMethod) {
    // Determine input queue partition type
    HashPartition hashPartition = processMethod.getAnnotation(HashPartition.class);
    RoundRobin roundRobin = processMethod.getAnnotation(RoundRobin.class);
    DequeueStrategy strategy = DequeueStrategy.FIFO;
    String hashKey = null;
    Preconditions.checkArgument(!(hashPartition != null && roundRobin != null), "Only one strategy allowed for process() method: %s", processMethod.getName());
    if (hashPartition != null) {
        strategy = DequeueStrategy.HASH;
        hashKey = hashPartition.value();
        Preconditions.checkArgument(!hashKey.isEmpty(), "Partition key cannot be empty: %s", processMethod.getName());
    } else if (roundRobin != null) {
        strategy = DequeueStrategy.ROUND_ROBIN;
    }
    return new ConsumerGroupConfig(groupId, groupSize, strategy, hashKey);
}