如何在Scala中公开Kafka的Java方法（带有分区的CommitSync）？

Question

我正在尝试通过Scala公开Java方法（有关原始Java方法的更多详细信息-
它来自Kafka）

这是原始的Java方法：

public void commitSync(Map<TopicPartition,OffsetAndMetadata> offsets)

如何在Scala中公开参数并将其传递给方法？我有类似的东西：

def commitSync() = {
     consumer.commitSync(...)
}

谢谢。

Answer 1

您的Scala代码段看起来正确，这是我填写其余内容的方式：

import org.apache.kafka.clients.consumer.{KafkaConsumer, OffsetAndMetadata}
import org.apache.kafka.common.TopicPartition

import collection.mutable.Map
import collection.JavaConverters._

//initialise your consumer the way you want
val consumer = createKafkaConsumer(config, subscriptions)

//you could accept a scala.collection.mutable.Map here
def commitSync(offsets: Map[TopicPartition, OffsetAndMetadata]) = {
    //and then convert it to a java.util.Map
    consumer.commitSync(offsets.asJava)
}