Adding easy access to commitable offsets (apache#628)

* Adding SQL API to write to kafka from Spark (apache#567)

* Branch 2.4.3 extended kafka and examples (apache#569)

* The v2 API is in its own package

- the v2 api is in a different package
- the old functionality is available in a separated package

* v2 API examples

- All the examples are using the newest API.
- I have removed the old examples since they are not relevant any more and the same functionality is shown in the new examples usin the new API.

* Adding easy access to commitable offsets

* Adding easy access to commitable offsets

Co-authored-by: Nicolas A Perez <anicolaspp@gmail.com>

external/kafka-0-10/src/main/scala/org/apache/spark/streaming/kafka010/package.scala

@@ -19,6 +19,9 @@ package org.apache.spark.streaming
 
 import org.apache.spark.internal.config.ConfigBuilder
 
+import org.apache.kafka.clients.consumer.OffsetCommitCallback
+import org.apache.spark.streaming.kafka010.{CanCommitOffsets, DirectKafkaInputDStream, HasOffsetRanges}
+
 /**
  * Spark Integration for Kafka 0.9
  */
@@ -72,5 +75,23 @@ package object kafka010 { //scalastyle:ignore
       .booleanConf
       .createWithDefault(false)
 
+  /**
+   * This extension provides easy access to commit offsets back to MapR-ES or Kafka
+   *
+   * @param directKafkaInputDStream We can only call this function on the original stream and not the transformations
+   * @tparam K
+   * @tparam V
+   */
+  implicit class CanCommitStreamOffsets[K, V](directKafkaInputDStream: DirectKafkaInputDStream[K, V]) {
+    def commitOffsetsAsync(): Unit = commitOffsetsAsync(null)
+
+    def commitOffsetsAsync(callback: OffsetCommitCallback): Unit = {
+      directKafkaInputDStream.foreachRDD { rdd =>
+        val offsets = rdd.asInstanceOf[HasOffsetRanges].offsetRanges
+
+        directKafkaInputDStream.asInstanceOf[CanCommitOffsets].commitAsync(offsets)
+      }
+    }
+  }
 }