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/*
* 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 org.apache.spark.streaming.api.java.mqtt
import scala.reflect.ClassTag
import org.apache.spark.storage.StorageLevel
import org.apache.spark.streaming.api.java.{JavaDStream, JavaStreamingContext}
import org.apache.spark.streaming.mqtt._
/**
* Subclass of [[org.apache.spark.streaming.api.java.JavaStreamingContext]] that has extra
* functions for creating MQTT input streams.
*/
class MQTTFunctions(javaStreamingContext: JavaStreamingContext) {
/**
* Create an input stream that receives messages pushed by a MQTT publisher.
* @param brokerUrl Url of remote MQTT publisher
* @param topic topic name to subscribe to
*/
def mqttStream(
brokerUrl: String,
topic: String
): JavaDStream[String] = {
implicitly[ClassTag[AnyRef]].asInstanceOf[ClassTag[String]]
javaStreamingContext.ssc.mqttStream(brokerUrl, topic)
}
/**
* Create an input stream that receives messages pushed by a MQTT publisher.
* @param brokerUrl Url of remote MQTT publisher
* @param topic topic name to subscribe to
* @param storageLevel RDD storage level.
*/
def mqttStream(
brokerUrl: String,
topic: String,
storageLevel: StorageLevel = StorageLevel.MEMORY_AND_DISK_SER_2
): JavaDStream[String] = {
implicitly[ClassTag[AnyRef]].asInstanceOf[ClassTag[String]]
javaStreamingContext.ssc.mqttStream(brokerUrl, topic, storageLevel)
}
}
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