| /** |
| * 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.apex.malhar.contrib.mqtt; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.ArrayBlockingQueue; |
| |
| import org.fusesource.mqtt.client.BlockingConnection; |
| import org.fusesource.mqtt.client.MQTT; |
| import org.fusesource.mqtt.client.Message; |
| import org.fusesource.mqtt.client.QoS; |
| import org.fusesource.mqtt.client.Topic; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| import com.datatorrent.api.Context.OperatorContext; |
| import com.datatorrent.api.InputOperator; |
| import com.datatorrent.api.Operator.ActivationListener; |
| |
| /** |
| * This is the base implementation for and MQTT input operator. |
| * A concrete operator should be created from this skeleton implementation. |
| * <p></p> |
| * @displayName Abstract MQTT Input |
| * @category Messaging |
| * @tags input operator |
| * @since 0.9.3 |
| */ |
| public abstract class AbstractMqttInputOperator implements InputOperator, ActivationListener<OperatorContext> |
| { |
| private static final Logger LOG = LoggerFactory.getLogger(AbstractMqttInputOperator.class); |
| private static final int DEFAULT_BLAST_SIZE = 1000; |
| private static final int DEFAULT_BUFFER_SIZE = 1024 * 1024; |
| private int tupleBlast = DEFAULT_BLAST_SIZE; |
| private int bufferSize = DEFAULT_BUFFER_SIZE; |
| protected Map<String, QoS> topicMap = new HashMap<String, QoS>(); |
| protected MqttClientConfig mqttClientConfig; |
| protected transient MQTT client; |
| protected transient ArrayBlockingQueue<Message> holdingBuffer; |
| protected transient BlockingConnection connection; |
| protected transient Thread thread; |
| |
| /** |
| * Emits the tuple upon arrival of MQTT message |
| * |
| * @param message The MQTT message |
| */ |
| public abstract void emitTuple(Message message); |
| |
| /** |
| * Gets the MQTT config object |
| * |
| * @return the config object |
| */ |
| public MqttClientConfig getMqttClientConfig() |
| { |
| return mqttClientConfig; |
| } |
| |
| /** |
| * Sets the MQTT config object |
| * |
| * @param mqttClientConfig the config object |
| */ |
| public void setMqttClientConfig(MqttClientConfig mqttClientConfig) |
| { |
| this.mqttClientConfig = mqttClientConfig; |
| } |
| |
| /** |
| * Sets the tuple blast |
| * |
| * @param tupleBlast the number of tuples to blast |
| */ |
| public void setTupleBlast(int tupleBlast) |
| { |
| this.tupleBlast = tupleBlast; |
| } |
| |
| /** |
| * Adds subscribe topic with the given QoS |
| * |
| * @param topic the topic |
| * @param qos the QoS |
| */ |
| public void addSubscribeTopic(String topic, QoS qos) |
| { |
| topicMap.put(topic, qos); |
| } |
| |
| /** |
| * Removes the subscribe topic |
| * |
| * @param topic the topic |
| */ |
| public void removeSubscribeTopic(String topic) |
| { |
| topicMap.remove(topic); |
| } |
| |
| @Override |
| public void emitTuples() |
| { |
| int ntuples = tupleBlast; |
| if (ntuples > holdingBuffer.size()) { |
| ntuples = holdingBuffer.size(); |
| } |
| for (int i = ntuples; i-- > 0;) { |
| Message msg = holdingBuffer.poll(); |
| if (msg == null) { |
| break; |
| } |
| emitTuple(msg); |
| } |
| } |
| |
| @Override |
| public void beginWindow(long l) |
| { |
| } |
| |
| @Override |
| public void endWindow() |
| { |
| } |
| |
| @Override |
| public void setup(OperatorContext t1) |
| { |
| holdingBuffer = new ArrayBlockingQueue<Message>(bufferSize); |
| } |
| |
| @Override |
| public void teardown() |
| { |
| } |
| |
| private void initializeConnection() throws Exception |
| { |
| connection = client.blockingConnection(); |
| connection.connect(); |
| if (!topicMap.isEmpty()) { |
| Topic[] topics = new Topic[topicMap.size()]; |
| int i = 0; |
| for (Map.Entry<String, QoS> entry : topicMap.entrySet()) { |
| topics[i++] = new Topic(entry.getKey(), entry.getValue()); |
| } |
| connection.subscribe(topics); |
| } |
| } |
| |
| @Override |
| public void activate(OperatorContext context) |
| { |
| try { |
| client = new MQTT(); |
| if (mqttClientConfig.getClientId() != null) { |
| client.setClientId(mqttClientConfig.getClientId()); |
| } |
| client.setCleanSession(mqttClientConfig.isCleanSession()); |
| client.setConnectAttemptsMax(mqttClientConfig.getConnectAttemptsMax()); |
| client.setHost(mqttClientConfig.getHost(), mqttClientConfig.getPort()); |
| client.setKeepAlive(mqttClientConfig.getKeepAliveInterval()); |
| if (mqttClientConfig.getPassword() != null) { |
| client.setPassword(mqttClientConfig.getPassword()); |
| } |
| if (mqttClientConfig.getUserName() != null) { |
| client.setUserName(mqttClientConfig.getUserName()); |
| } |
| if (mqttClientConfig.getWillMessage() != null) { |
| client.setWillMessage(mqttClientConfig.getWillMessage()); |
| client.setWillQos(mqttClientConfig.getWillQos()); |
| client.setWillRetain(mqttClientConfig.isWillRetain()); |
| } |
| if (mqttClientConfig.getWillTopic() != null) { |
| client.setWillTopic(mqttClientConfig.getWillTopic()); |
| } |
| initializeConnection(); |
| thread = new Thread(new Runnable() |
| { |
| @Override |
| public void run() |
| { |
| while (true) { |
| try { |
| Message msg = connection.receive(); |
| holdingBuffer.add(msg); |
| } catch (Exception ex) { |
| LOG.error("Trouble receiving", ex); |
| } |
| } |
| } |
| |
| }); |
| thread.start(); |
| } catch (Exception ex) { |
| LOG.error("Caught exception during activation: ", ex); |
| throw new RuntimeException(ex); |
| } |
| |
| } |
| |
| @Override |
| public void deactivate() |
| { |
| try { |
| thread.interrupt(); |
| thread.join(); |
| } catch (InterruptedException ex) { |
| LOG.error("interrupted"); |
| } finally { |
| try { |
| connection.disconnect(); |
| } catch (Exception ex) { |
| LOG.error("Caught exception during disconnect", ex); |
| } |
| } |
| } |
| |
| } |