modify code, use Spark Logging Class

streaming/src/main/scala/org/apache/spark/streaming/dstream/MQTTInputDStream.scala

@@ -23,16 +23,16 @@ import org.apache.spark.streaming.{ Time, DStreamCheckpointData, StreamingContex
 
 import java.util.Properties
 import java.util.concurrent.Executors
-import java.io.IOException;
+import java.io.IOException
 
-import org.eclipse.paho.client.mqttv3.MqttCallback;
-import org.eclipse.paho.client.mqttv3.MqttClient;
-import org.eclipse.paho.client.mqttv3.MqttClientPersistence;
-import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
-import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
-import org.eclipse.paho.client.mqttv3.MqttException;
-import org.eclipse.paho.client.mqttv3.MqttMessage;
-import org.eclipse.paho.client.mqttv3.MqttTopic;
+import org.eclipse.paho.client.mqttv3.MqttCallback
+import org.eclipse.paho.client.mqttv3.MqttClient
+import org.eclipse.paho.client.mqttv3.MqttClientPersistence
+import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence
+import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken
+import org.eclipse.paho.client.mqttv3.MqttException
+import org.eclipse.paho.client.mqttv3.MqttMessage
+import org.eclipse.paho.client.mqttv3.MqttTopic
 
 import scala.collection.Map
 import scala.collection.mutable.HashMap
@@ -50,9 +50,7 @@ private[streaming] class MQTTInputDStream[T: ClassManifest](
   @transient ssc_ : StreamingContext,
   brokerUrl: String,
   topic: String,
-
   storageLevel: StorageLevel) extends NetworkInputDStream[T](ssc_) with Logging {
-
   def getReceiver(): NetworkReceiver[T] = {
     new MQTTReceiver(brokerUrl, topic, storageLevel)
       .asInstanceOf[NetworkReceiver[T]]
@@ -62,50 +60,43 @@ private[streaming] class MQTTInputDStream[T: ClassManifest](
 private[streaming] class MQTTReceiver(brokerUrl: String,
   topic: String,
   storageLevel: StorageLevel) extends NetworkReceiver[Any] {
-
   lazy protected val blockGenerator = new BlockGenerator(storageLevel)
-
   def onStop() {
     blockGenerator.stop()
   }
-
   def onStart() {
 
     blockGenerator.start()
 
-    //Set up persistence for messages 
-   var peristance:MqttClientPersistence =new MemoryPersistence();
+    // Set up persistence for messages 
+    var peristance: MqttClientPersistence = new MemoryPersistence()
+
+    // Initializing Mqtt Client specifying brokerUrl, clientID and MqttClientPersistance
+    var client: MqttClient = new MqttClient(brokerUrl, "MQTTSub", peristance)
 
-    //Initializing Mqtt Client specifying brokerUrl, clientID and MqttClientPersistance
-    var client: MqttClient = new MqttClient(brokerUrl, "MQTTSub", peristance);
+    // Connect to MqttBroker    
+    client.connect()
 
-    //Connect to MqttBroker    
-    client.connect();
-    
-    //Subscribe to Mqtt topic
-    client.subscribe(topic);
-    
-    //Callback automatically triggers as and when new message arrives on specified topic
+    // Subscribe to Mqtt topic
+    client.subscribe(topic)
+
+    // Callback automatically triggers as and when new message arrives on specified topic
     var callback: MqttCallback = new MqttCallback() {
 
-      //Handles Mqtt message 
+      // Handles Mqtt message 
       override def messageArrived(arg0: String, arg1: MqttMessage) {
         blockGenerator += new String(arg1.getPayload())
       }
-      
+
       override def deliveryComplete(arg0: IMqttDeliveryToken) {
       }
 
       override def connectionLost(arg0: Throwable) {
-        System.err.println("Connection lost " + arg0)
-
+        logInfo("Connection lost " + arg0)
       }
+    }
 
-    };
-
-    //Set up callback for MqttClient
-    client.setCallback(callback);
-
+    // Set up callback for MqttClient
+    client.setCallback(callback)
   }
-
 }