Github user mridulm commented on a diff in the pull request:
https://github.com/apache/bahir/pull/13#discussion_r72379877
--- Diff:
sql-streaming-mqtt/src/main/scala/org/apache/bahir/sql/streaming/mqtt/MQTTStream.scala
---
@@ -0,0 +1,141 @@
+/*
+ * 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.bahir.sql.streaming.mqtt
+
+import java.sql.Timestamp
+import java.text.SimpleDateFormat
+import java.util.Calendar
+import java.util.concurrent.atomic.AtomicLong
+import javax.annotation.concurrent.GuardedBy
+
+import scala.collection.mutable.ArrayBuffer
+
+import org.eclipse.paho.client.mqttv3._
+import org.eclipse.paho.client.mqttv3.persist.{MemoryPersistence,
MqttDefaultFilePersistence}
+
+import org.apache.spark.sql.{DataFrame, SQLContext}
+import org.apache.spark.sql.execution.streaming.{LongOffset, Offset,
Source}
+import org.apache.spark.sql.sources.{DataSourceRegister,
StreamSourceProvider}
+import org.apache.spark.sql.types.{StringType, StructField, StructType,
TimestampType}
+
+
+object MQTTStream {
+
+ val DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
+
+ val SCHEMA_DEFAULT = StructType(StructField("value", StringType)
+ :: StructField("timestamp", TimestampType) :: Nil)
+}
+
+class MQTTTextStream(brokerUrl: String, persistence: MqttClientPersistence,
+ topic: String, messageParser: Array[Byte] => (String, Timestamp),
+ sqlContext: SQLContext) extends Source with Logging {
+
+ override def schema: StructType = MQTTStream.SCHEMA_DEFAULT
+
+ @GuardedBy("this")
+ private var messages = new ArrayBuffer[(String, Timestamp)]
+ initialize()
+ private def initialize(): Unit = {
+
+ val client = new MqttClient(brokerUrl, MqttClient.generateClientId(),
persistence)
+ val mqttConnectOptions: MqttConnectOptions = new MqttConnectOptions()
+ mqttConnectOptions.setAutomaticReconnect(true)
+ val callback = new MqttCallbackExtended() {
+
+ override def messageArrived(topic_ : String, message: MqttMessage):
Unit = {
+ messages += messageParser(message.getPayload)
+ log.trace(s"Message arrived, $topic_ $message")
+ }
+
+ override def deliveryComplete(token: IMqttDeliveryToken): Unit = {
+ }
+
+ override def connectionLost(cause: Throwable): Unit = {
+ log.warn("Connection to mqtt server lost.", cause)
+ }
+
+ override def connectComplete(reconnect: Boolean, serverURI: String):
Unit = {
+ log.info(s"connect complete $serverURI. Is it a reconnect?:
$reconnect")
+ }
+ }
+ client.setCallback(callback)
+ client.connect(mqttConnectOptions)
+ client.subscribe(topic)
+ }
+
+ /** Stop this source and free any resources it has allocated. */
+ override def stop(): Unit = {
+ }
+
+ /** Returns the maximum available offset for this source. */
+ override def getOffset: Option[Offset] = {
+ if (messages.isEmpty) {
+ None
+ } else {
+ Some(LongOffset(messages.size))
+ }
--- End diff --
GuardedBy here wont work, right ?
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