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diff --git a/pnda-ztt-app/src/main/scala/com/github/benfradet/spark/kafka/writer/package.scala b/pnda-ztt-app/src/main/scala/com/github/benfradet/spark/kafka/writer/package.scala
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+++ b/pnda-ztt-app/src/main/scala/com/github/benfradet/spark/kafka/writer/package.scala
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+/**
+ * Copyright (c) 2016-2017, Benjamin Fradet, and other contributors.
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package com.github.benfradet.spark.kafka
+
+import org.apache.spark.rdd.RDD
+import org.apache.spark.streaming.dstream.DStream
+
+import scala.reflect.ClassTag
+
+/** Implicit conversions between
+ *  - [[DStream]] -> [[KafkaWriter]]
+ *  - [[RDD]] -> [[KafkaWriter]]
+ *  - [[Dataset]] -> [[KafkaWriter]]
+ *  - [[DataFrame]] -> [[KafkaWriter]]
+ */
+package object writer {
+  /**
+   * Convert a [[DStream]] to a [[KafkaWriter]] implicitly
+   * @param dStream [[DStream]] to be converted
+   * @return [[KafkaWriter]] ready to write messages to Kafka
+   */
+  implicit def dStreamToKafkaWriter[T: ClassTag, K, V](dStream: DStream[T]): KafkaWriter[T] =
+    new DStreamKafkaWriter[T](dStream)
+
+  /**
+   * Convert a [[RDD]] to a [[KafkaWriter]] implicitly
+   * @param rdd [[RDD]] to be converted
+   * @return [[KafkaWriter]] ready to write messages to Kafka
+   */
+  implicit def rddToKafkaWriter[T: ClassTag, K, V](rdd: RDD[T]): KafkaWriter[T] =
+    new RDDKafkaWriter[T](rdd)
+
+}