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From samai...@apache.org
Subject [ignite-extensions] branch master updated: IGNITE-12362 Migrate MQTT module to ignite-extensions - Fixes #17.
Date Sun, 12 Jul 2020 21:14:46 GMT
This is an automated email from the ASF dual-hosted git repository.

samaitra pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/ignite-extensions.git


The following commit(s) were added to refs/heads/master by this push:
     new c1dc651  IGNITE-12362 Migrate MQTT module to ignite-extensions - Fixes #17.
c1dc651 is described below

commit c1dc651c8e3fbda067da67d07e23e54af291db81
Author: samaitra <saikat.maitra@gmail.com>
AuthorDate: Sun Jul 12 16:14:02 2020 -0500

    IGNITE-12362 Migrate MQTT module to ignite-extensions - Fixes #17.
    
    Signed-off-by: samaitra <saikat.maitra@gmail.com>
---
 modules/mqtt-ext/README.txt                        |  29 +
 modules/mqtt-ext/licenses/apache-2.0.txt           | 202 ++++++
 .../modules/core/src/test/config/log4j-test.xml    |  97 +++
 .../modules/core/src/test/config/tests.properties  | 153 +++++
 modules/mqtt-ext/pom.xml                           | 123 ++++
 .../apache/ignite/stream/mqtt/MqttStreamer.java    | 709 +++++++++++++++++++++
 .../apache/ignite/stream/mqtt/package-info.java    |  22 +
 .../ignite/stream/mqtt/IgniteMqttStreamerTest.java | 649 +++++++++++++++++++
 .../stream/mqtt/IgniteMqttStreamerTestSuite.java   |  32 +
 .../apache/ignite/stream/mqtt/package-info.java    |  22 +
 pom.xml                                            |   1 +
 11 files changed, 2039 insertions(+)

diff --git a/modules/mqtt-ext/README.txt b/modules/mqtt-ext/README.txt
new file mode 100644
index 0000000..b90d301
--- /dev/null
+++ b/modules/mqtt-ext/README.txt
@@ -0,0 +1,29 @@
+Apache Ignite MQTT Module
+-------------------------
+
+Apache Ignite MQTT module provides a streamer to consume MQTT topic messages into
+Apache Ignite caches.
+
+Importing Apache Ignite MQTT Module In Maven Project
+----------------------------------------------------
+
+If you are using Maven to manage dependencies of your project, you can add the MQTT module
+dependency like this (replace '${ignite.version}' with actual Ignite version you are
+interested in):
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
+                        http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    ...
+    <dependencies>
+        ...
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-mqtt-ext</artifactId>
+            <version>${ignite.version}</version>
+        </dependency>
+        ...
+    </dependencies>
+    ...
+</project>
diff --git a/modules/mqtt-ext/licenses/apache-2.0.txt b/modules/mqtt-ext/licenses/apache-2.0.txt
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/modules/mqtt-ext/licenses/apache-2.0.txt
@@ -0,0 +1,202 @@
+
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diff --git a/modules/mqtt-ext/modules/core/src/test/config/log4j-test.xml b/modules/mqtt-ext/modules/core/src/test/config/log4j-test.xml
new file mode 100755
index 0000000..b78fa9c
--- /dev/null
+++ b/modules/mqtt-ext/modules/core/src/test/config/log4j-test.xml
@@ -0,0 +1,97 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+  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.
+-->
+
+<!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN"
+    "http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/xml/doc-files/log4j.dtd">
+<!--
+    Log4j configuration.
+-->
+<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" debug="false">
+    <!--
+        Logs System.out messages to console.
+    -->
+    <appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
+        <!-- Log to STDOUT. -->
+        <param name="Target" value="System.out"/>
+
+        <!-- Log from DEBUG and higher. -->
+        <param name="Threshold" value="DEBUG"/>
+
+        <!-- The default pattern: Date Priority [Category] Message\n -->
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="[%d{ISO8601}][%-5p][%t][%c{1}] %m%n"/>
+        </layout>
+
+        <!-- Do not log beyond INFO level. -->
+        <filter class="org.apache.log4j.varia.LevelRangeFilter">
+            <param name="levelMin" value="DEBUG"/>
+            <param name="levelMax" value="INFO"/>
+        </filter>
+    </appender>
+
+    <!--
+        Logs all System.err messages to console.
+    -->
+    <appender name="CONSOLE_ERR" class="org.apache.log4j.ConsoleAppender">
+        <!-- Log to STDERR. -->
+        <param name="Target" value="System.err"/>
+
+        <!-- Log from WARN and higher. -->
+        <param name="Threshold" value="WARN"/>
+
+        <!-- The default pattern: Date Priority [Category] Message\n -->
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="[%d{ISO8601}][%-5p][%t][%c{1}] %m%n"/>
+        </layout>
+    </appender>
+
+    <!--
+        Logs all output to specified file.
+    -->
+    <appender name="FILE" class="org.apache.log4j.RollingFileAppender">
+        <param name="Threshold" value="DEBUG"/>
+        <param name="File" value="${IGNITE_HOME}/work/log/ignite.log"/>
+        <param name="Append" value="true"/>
+        <param name="MaxFileSize" value="10MB"/>
+        <param name="MaxBackupIndex" value="10"/>
+        <layout class="org.apache.log4j.PatternLayout">
+            <param name="ConversionPattern" value="[%d{ISO8601}][%-5p][%t][%c{1}] %m%n"/>
+        </layout>
+    </appender>
+
+    <!-- Disable all open source debugging. -->
+    <category name="org">
+        <level value="INFO"/>
+    </category>
+
+    <category name="org.eclipse.jetty">
+        <level value="INFO"/>
+    </category>
+
+    <!-- Default settings. -->
+    <root>
+        <!-- Print at info by default. -->
+        <level value="INFO"/>
+
+        <!-- Append to file and console. -->
+        <appender-ref ref="FILE"/>
+        <appender-ref ref="CONSOLE"/>
+        <appender-ref ref="CONSOLE_ERR"/>
+    </root>
+</log4j:configuration>
diff --git a/modules/mqtt-ext/modules/core/src/test/config/tests.properties b/modules/mqtt-ext/modules/core/src/test/config/tests.properties
new file mode 100644
index 0000000..18b3606
--- /dev/null
+++ b/modules/mqtt-ext/modules/core/src/test/config/tests.properties
@@ -0,0 +1,153 @@
+#
+# 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.
+#
+
+# Local address to bind to.
+local.ip=127.0.0.1
+
+# TCP communication port
+comm.tcp.port=30010
+
+# JBoss JNDI
+# JBoss context factory for JNDI connection establishing.
+jboss.jndi.context.factory=org.jnp.interfaces.NamingContextFactory
+# JBoss specific parameter for JNDI connection establishing.
+jboss.jndi.pkg.prefixes=org.jboss.naming:org.jnp.interfaces
+# URL of JBoss server for the 1st node.
+jboss.jndi.node1.provider.url=jnp://localhost:1199
+# URL of JBoss server for the 2nd node.
+jboss.jndi.node2.provider.url=jnp://localhost:1299
+# JBoss Discovery test max wait time.
+jboss.disco.test.wait=180000
+
+# Deployment configuration paths.
+# You will either need to override deploy.uri.dir or supply CLASSES_URI as system property.
+#
+# Path to keystore with private and public keys.
+deploy.uri.secure.keystore=@{IGNITE_HOME}/modules/tests/config/securedeploy/keystore
+# Temporary dir where deployment unit stored before deploy.
+deploy.uri.tmpdir=${java.io.tmpdir}/gg
+# Deployment dir for file scanner test with different types of GAR's.
+deploy.uri.file2.path=${java.io.tmpdir}/gg/verification/
+# URI string.
+deploy.uri.file2=file://freq=200@localhost/${java.io.tmpdir}/gg/verification/
+# File scanner URI for local file deployment.
+deploy.uri.file=file://localhost/@{IGNITE_HOME}/modules/extdata/uri/target/file/
+# FTP scanner URI for FTP deployment.
+deploy.uri.ftp=ftp://ftptest:iddqd@94.72.60.102:21/test/deployment
+# Classes scanner URI for classes deployment. Must be overridden for every user.
+deploy.uri.cls=${CLASSES_URI}
+# Http scanner URI for HTTP deployment.
+deploy.uri.http=http://fake.uri
+# Http scanner URI for secure SSL HTTPs deployment.
+deploy.uri.https=https://fake.uri
+# Directory with descriptors to construct GAR files.
+deploy.gar.descriptor.dir=modules/urideploy/src/test/java/org/apache/ignite/spi/deployment/uri/META-INF
+
+# Directory with a number of descriptors for the Ant gar task.
+ant.gar.descriptor.dir=modules/extdata/p2p/META-INF
+# Temporary directory for the Ant task resulting GAR file.
+ant.gar.tmpdir=${java.io.tmpdir}/gg
+# The same as p2p.uri.cls but without protocol
+ant.gar.srcdir=@{IGNITE_HOME}/modules/extdata/uri/target/classes/
+
+# Paths to use in URI deployment SPI tests
+urideployment.jar.uri=modules/extdata/uri/target/deploy/uri.jar
+urideployment.path.tmp=modules/extdata/uri/target/deploy_tmp/
+
+# GAR paths to use in URI deployment SPI tests
+ant.urideployment.gar.uri=file://freq=5000@localhost/EXTDATA/uri/target/deploy
+ant.urideployment.gar.file=modules/extdata/uri/target/deploy/uri.gar
+ant.urideployment.gar.libs-file=modules/extdata/uri/target/deploy2/uri-libs.gar
+ant.urideployment.gar.classes-file=modules/extdata/uri/target/deploy2/uri-classes.gar
+ant.urideployment.gar.path=modules/extdata/uri/target/deploy/
+
+# Classpath directory for GridP2PUserVersionChangeSelfTest
+ant.userversion.class.dir=@{IGNITE_HOME}/modules/tests/java/
+
+# Multicast discovery self test.
+discovery.mbeanserver.selftest.baseport=50000
+
+# TCP communication self test.
+comm.mbeanserver.selftest.baseport=50100
+
+# Kernel tests.
+grid.comm.selftest.sender.timeout=1000
+grid.comm.selftest.timeout=10000
+
+#P2P tests
+#Overwrite this property. It should point to P2P module compilation directory.
+p2p.uri.cls=file://localhost/@{IGNITE_HOME}/modules/extdata/p2p/target/classes/
+p2p.uri.cls.second=file://localhost/@{IGNITE_HOME}/modules/extdata/uri/target/classes/
+
+# AOP tests.
+# Connector port for RMI.
+connector.rmi.port=7657
+# Connector port for XFire Web Service.
+connector.ws.port=9090
+
+# Load test duration in minutes.
+load.test.duration=500
+load.test.threadnum=50
+load.test.nodenum=5
+
+# Loaders tests
+loader.self.test.config=modules/core/src/test/config/loaders/grid-cfg.xml
+loader.self.multipletest.config=modules/core/src/test/config/loaders/grid-cfg-2-grids.xml
+loader.self.test.jboss.config=modules/core/src/test/config/loaders/grid-cfg.xml
+
+# WebSphere jmx properties
+websphere.jmx.connector.host=localhost
+websphere.jmx.connector.port=8880
+websphere.jmx.connector.security=false
+websphere.jmx.username=
+websphere.jmx.pwd=
+
+# GlassFish jmx properties for GlassFish Loader
+glassfish.jmx.rmi.connector.port=8686
+glassfish.jmx.username=admin
+glassfish.jmx.password=adminadmin
+
+# Tomcat jmx properties for Servlet Loader
+tomcat.jmx.rmi.connector.port=1097
+
+# Marshaller for tests
+#marshaller.class=org.apache.ignite.marshaller.jdk.GridJdkMarshaller
+
+# EC2 configuration for tests
+#amazon.access.key=
+#amazon.secret.key=
+
+# SSH config.
+ssh.username=uname
+ssh.password=passwd
+
+# SSL tests keystore.
+ssl.keystore.path=@{IGNITE_HOME}/modules/clients/src/test/keystore/server.jks
+ssl.keystore.password=123456
+
+# node01 signed with trust-one, node02 and node03 by trust-two, node02old is expired
+# trust-both contains both CAs
+ssl.keystore.node01.path=@{IGNITE_HOME}/modules/clients/src/test/keystore/ca/node01.jks
+ssl.keystore.node02.path=@{IGNITE_HOME}/modules/clients/src/test/keystore/ca/node02.jks
+ssl.keystore.node03.path=@{IGNITE_HOME}/modules/clients/src/test/keystore/ca/node03.jks
+ssl.keystore.trustone.path=@{IGNITE_HOME}/modules/clients/src/test/keystore/ca/trust-one.jks
+ssl.keystore.trusttwo.path=@{IGNITE_HOME}/modules/clients/src/test/keystore/ca/trust-two.jks
+ssl.keystore.trustboth.path=@{IGNITE_HOME}/modules/clients/src/test/keystore/ca/trust-both.jks
+ssl.keystore.node02old.path=@{IGNITE_HOME}/modules/clients/src/test/keystore/ca/node02old.jks
+
+# Hadoop home directory.
+hadoop.home=@{HADOOP_HOME}
diff --git a/modules/mqtt-ext/pom.xml b/modules/mqtt-ext/pom.xml
new file mode 100644
index 0000000..3490312
--- /dev/null
+++ b/modules/mqtt-ext/pom.xml
@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+  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.
+-->
+
+<!--
+    POM file.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.apache.ignite</groupId>
+        <artifactId>ignite-extensions-parent</artifactId>
+        <version>1</version>
+        <relativePath>../../parent</relativePath>
+    </parent>
+
+    <artifactId>ignite-mqtt-ext</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <url>http://ignite.apache.org</url>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-core</artifactId>
+            <version>${ignite.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.eclipse.paho</groupId>
+            <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
+            <version>${paho.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.github.rholder</groupId>
+            <artifactId>guava-retrying</artifactId>
+            <version>${guava.retrying.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.activemq</groupId>
+            <artifactId>activemq-broker</artifactId>
+            <version>${activemq.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.activemq</groupId>
+            <artifactId>activemq-mqtt</artifactId>
+            <version>${activemq.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-log4j</artifactId>
+            <version>${ignite.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-spring</artifactId>
+            <version>${ignite.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-core</artifactId>
+            <version>${ignite.version}</version>
+            <type>test-jar</type>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <!-- Repository for Mosquette (embedded MQTT broker for tests) and for Eclipse Paho (MQTT client) -->
+    <repositories>
+        <repository>
+            <id>Eclipse Paho Repo</id>
+            <url>https://repo.eclipse.org/content/repositories/paho-releases/</url>
+            <releases>
+                <enabled>true</enabled>
+            </releases>
+            <snapshots>
+                <enabled>false</enabled>
+            </snapshots>
+        </repository>
+    </repositories>
+
+    <build>
+        <plugins>
+            <!-- Generate the OSGi MANIFEST.MF for this bundle. -->
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
diff --git a/modules/mqtt-ext/src/main/java/org/apache/ignite/stream/mqtt/MqttStreamer.java b/modules/mqtt-ext/src/main/java/org/apache/ignite/stream/mqtt/MqttStreamer.java
new file mode 100644
index 0000000..1ae59be
--- /dev/null
+++ b/modules/mqtt-ext/src/main/java/org/apache/ignite/stream/mqtt/MqttStreamer.java
@@ -0,0 +1,709 @@
+/*
+ * 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.ignite.stream.mqtt;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+import org.apache.ignite.IgniteDataStreamer;
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.internal.util.typedef.internal.A;
+import org.apache.ignite.stream.StreamAdapter;
+import org.apache.ignite.stream.StreamMultipleTupleExtractor;
+import org.apache.ignite.stream.StreamSingleTupleExtractor;
+
+import com.github.rholder.retry.Retryer;
+import com.github.rholder.retry.RetryerBuilder;
+import com.github.rholder.retry.StopStrategies;
+import com.github.rholder.retry.StopStrategy;
+import com.github.rholder.retry.WaitStrategies;
+import com.github.rholder.retry.WaitStrategy;
+import com.google.common.base.Joiner;
+import com.google.common.base.Predicate;
+import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
+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.MqttConnectOptions;
+import org.eclipse.paho.client.mqttv3.MqttMessage;
+
+/**
+ * Streamer that consumes from a MQTT topic and feeds key-value pairs into an {@link IgniteDataStreamer} instance,
+ * using Eclipse Paho as an MQTT client.
+ * <p>
+ * You must also provide a {@link StreamSingleTupleExtractor} or a {@link StreamMultipleTupleExtractor} to extract
+ * cache tuples out of the incoming message.
+ * <p>
+ * This Streamer has many features:
+ *
+ * <ul>
+ *     <li>Subscribing to a single topic or multiple topics at once.</li>
+ *     <li>Specifying the subscriber's QoS for a single topic or for multiple topics.</li>
+ *     <li>Allows setting {@link MqttConnectOptions} to support features like last will testament, persistent
+ *         sessions, etc.</li>
+ *     <li>Specifying the client ID. A random one will be generated and maintained throughout reconnections if the user
+ *         does not provide one.</li>
+ *     <li>(Re-)Connection retries based on the <i>guava-retrying</i> library. Retry wait and retry stop policies
+ *         can be configured.</li>
+ *     <li>Blocking the start() method until connected for the first time.</li>
+ * </ul>
+ *
+ * Note: features like durable subscriptions, last will testament, etc. can be configured via the
+ * {@link #setConnectOptions(MqttConnectOptions)} setter.
+ *
+ * @see <a href="https://github.com/rholder/guava-retrying">guava-retrying library</a>
+ */
+public class MqttStreamer<K, V> extends StreamAdapter<MqttMessage, K, V> implements MqttCallback {
+    /** Logger. */
+    private IgniteLogger log;
+
+    /** The MQTT client object for internal use. */
+    private MqttClient client;
+
+    /** The broker URL, set by the user. */
+    private String brokerUrl;
+
+    /** The topic to subscribe to, if a single topic. */
+    private String topic;
+
+    /** The quality of service to use for a single topic subscription (optional). */
+    private Integer qualityOfService;
+
+    /** The topics to subscribe to, if many. */
+    private List<String> topics;
+
+    /**
+     * The qualities of service to use for multiple topic subscriptions. If specified, it must contain the same
+     * number of elements as {@link #topics}.
+     */
+    private List<Integer> qualitiesOfService;
+
+    /** The MQTT client ID (optional). */
+    private String clientId;
+
+    /** A configurable persistence mechanism. If not set, Paho will use its default. */
+    private MqttClientPersistence persistence;
+
+    /** The MQTT client connect options, where users can configured the last will and testament, durability, etc. */
+    private MqttConnectOptions connectOptions;
+
+    /** Quiesce timeout on disconnection. */
+    private Integer disconnectQuiesceTimeout;
+
+    /** Whether to disconnect forcibly or not. */
+    private boolean disconnectForcibly;
+
+    /** If disconnecting forcibly, the timeout. */
+    private Integer disconnectForciblyTimeout;
+
+    /**
+     * The strategy to determine how long to wait between retry attempts. By default, this streamer uses a
+     * Fibonacci-based strategy.
+     */
+    private WaitStrategy retryWaitStrategy = WaitStrategies.fibonacciWait();
+
+    /** The strategy to determine when to stop retrying to (re-)connect. By default, we never stop. */
+    private StopStrategy retryStopStrategy = StopStrategies.neverStop();
+
+    /** The internal connection retrier object with a thread pool of size 1. */
+    private MqttConnectionRetrier connectionRetrier;
+
+    /** Whether to block the start() method until connected for the first time. */
+    private boolean blockUntilConnected;
+
+    /** State keeping. */
+    private volatile boolean stopped = true;
+
+    /** Cached log prefix for cache messages. */
+    private String cachedLogValues;
+
+    /**
+     * Starts streamer.
+     *
+     * @throws IgniteException If failed.
+     */
+    public void start() throws IgniteException {
+        if (!stopped)
+            throw new IgniteException("Attempted to start an already started MQTT Streamer");
+
+        // For simplicity, if these are null initialize to empty lists.
+        topics = topics == null ? new ArrayList<String>() : topics;
+
+        qualitiesOfService = qualitiesOfService == null ? new ArrayList<Integer>() : qualitiesOfService;
+
+        try {
+            Map<String, Object> logValues = new HashMap<>();
+
+            // Parameter validations.
+            A.notNull(getStreamer(), "streamer");
+            A.notNull(getIgnite(), "ignite");
+            A.ensure(!(getSingleTupleExtractor() == null && getMultipleTupleExtractor() == null),
+                "tuple extractor missing");
+            A.ensure(getSingleTupleExtractor() == null || getMultipleTupleExtractor() == null,
+                "cannot provide both single and multiple tuple extractor");
+            A.notNullOrEmpty(brokerUrl, "broker URL");
+
+            // If the client ID is empty, generate one.
+            if (clientId == null || clientId.length() == 0)
+                clientId = MqttClient.generateClientId();
+
+            // If we have both a single topic and a list of topics (but the list of topic is not of
+            // size 1 and == topic, as this would be a case of re-initialization), fail.
+            if (topic != null && topic.length() > 0 && !topics.isEmpty() &&
+                topics.size() != 1 && !topics.get(0).equals(topic))
+                throw new IllegalArgumentException("Cannot specify both a single topic and a list at the same time.");
+
+            // Same as above but for QoS.
+            if (qualityOfService != null && !qualitiesOfService.isEmpty() && qualitiesOfService.size() != 1 &&
+                !qualitiesOfService.get(0).equals(qualityOfService))
+                throw new IllegalArgumentException("Cannot specify both a single QoS and a list at the same time.");
+
+            // Paho API requires disconnect timeout if providing a quiesce timeout and disconnecting forcibly.
+            if (disconnectForcibly && disconnectQuiesceTimeout != null)
+                A.notNull(disconnectForciblyTimeout, "disconnect timeout cannot be null when disconnecting forcibly " +
+                    "with quiesce");
+
+            // If we have multiple topics.
+            if (!topics.isEmpty()) {
+                for (String t : topics)
+                    A.notNullOrEmpty(t, "topic in list of topics");
+
+                A.ensure(qualitiesOfService.isEmpty() || qualitiesOfService.size() == topics.size(),
+                    "qualities of service must be either empty or have the same size as topics list");
+
+                logValues.put("topics", topics);
+            }
+            else {
+                // Just the single topic.
+                topics.add(topic);
+
+                if (qualityOfService != null)
+                    qualitiesOfService.add(qualityOfService);
+
+                logValues.put("topic", topic);
+            }
+
+            // Finish building log values.
+            logValues.put("brokerUrl", brokerUrl);
+            logValues.put("clientId", clientId);
+
+            // Cache log values.
+            cachedLogValues = "[" + Joiner.on(", ").withKeyValueSeparator("=").join(logValues) + "]";
+
+            // Create logger.
+            log = getIgnite().log();
+
+            // Create the MQTT client.
+            if (persistence == null)
+                client = new MqttClient(brokerUrl, clientId);
+            else
+                client = new MqttClient(brokerUrl, clientId, persistence);
+
+            // Set this as a callback.
+            client.setCallback(this);
+
+            // Set stopped to false, as the connection will start async.
+            stopped = false;
+
+            // Build retrier.
+            Retryer<Void> retrier = RetryerBuilder.<Void>newBuilder()
+                .retryIfResult(new Predicate<Void>() {
+                    @Override public boolean apply(Void v) {
+                        return !client.isConnected() && !stopped;
+                    }
+                })
+                .retryIfException().retryIfRuntimeException()
+                .withWaitStrategy(retryWaitStrategy)
+                .withStopStrategy(retryStopStrategy)
+                .build();
+
+            // Create the connection retrier.
+            connectionRetrier = new MqttConnectionRetrier(retrier);
+
+            if (log.isInfoEnabled())
+                log.info("Starting MQTT Streamer " + cachedLogValues);
+
+            // Connect.
+            connectionRetrier.connect();
+        }
+        catch (Exception e) {
+            throw new IgniteException("Failed to initialize MQTT Streamer.", e);
+        }
+    }
+
+    /**
+     * Stops streamer.
+     *
+     * @throws IgniteException If failed.
+     */
+    public void stop() throws IgniteException {
+        if (stopped)
+            throw new IgniteException("Failed to stop MQTT Streamer (already stopped).");
+
+        // Stop the retrier.
+        connectionRetrier.stop();
+
+        try {
+            if (disconnectForcibly) {
+                if (disconnectQuiesceTimeout == null && disconnectForciblyTimeout == null)
+                    client.disconnectForcibly();
+
+                else if (disconnectForciblyTimeout != null && disconnectQuiesceTimeout == null)
+                    client.disconnectForcibly(disconnectForciblyTimeout);
+
+                else
+                    client.disconnectForcibly(disconnectQuiesceTimeout, disconnectForciblyTimeout);
+            }
+            else {
+                if (disconnectQuiesceTimeout == null)
+                    client.disconnect();
+
+                else
+                    client.disconnect(disconnectQuiesceTimeout);
+            }
+
+            client.close();
+
+            stopped = true;
+        }
+        catch (Exception e) {
+            throw new IgniteException("Failed to stop Exception while stopping MQTT Streamer.", e);
+        }
+    }
+
+    // -------------------------------
+    //  MQTT Client callback methods
+    // -------------------------------
+
+    /**
+     * Implements the {@link MqttCallback#connectionLost(Throwable)} callback method for the MQTT client to inform the
+     * streamer that the connection has been lost.
+     *
+     * {@inheritDoc}
+     */
+    @Override public void connectionLost(Throwable throwable) {
+        // If we have been stopped, we do not try to establish the connection again.
+        if (stopped)
+            return;
+
+        log.warning(String.format("MQTT Connection to broker was lost [brokerUrl=%s, type=%s, err=%s]", brokerUrl,
+            throwable.getClass(), throwable.getMessage()));
+
+        connectionRetrier.connect();
+    }
+
+    /**
+     * Implements the {@link MqttCallback#messageArrived(String, MqttMessage)} to receive an MQTT message.
+     *
+     * {@inheritDoc}
+     */
+    @Override public void messageArrived(String topic, MqttMessage message) throws Exception {
+        if (getMultipleTupleExtractor() != null) {
+            Map<K, V> entries = getMultipleTupleExtractor().extract(message);
+
+            if (log.isTraceEnabled())
+                log.trace("Adding cache entries: " + entries);
+
+            getStreamer().addData(entries);
+        }
+        else {
+            Map.Entry<K, V> entry = getSingleTupleExtractor().extract(message);
+
+            if (log.isTraceEnabled())
+                log.trace("Adding cache entry: " + entry);
+
+            getStreamer().addData(entry);
+        }
+    }
+
+    /**
+     * Empty implementation of {@link MqttCallback#deliveryComplete(IMqttDeliveryToken)}.
+     *
+     * Not required by the streamer as it doesn't produce messages.
+     *
+     * {@inheritDoc}
+     */
+    @Override public void deliveryComplete(IMqttDeliveryToken token) {
+        // ignore, as we don't send messages
+    }
+
+    // -------------------------------
+    //  Getters and setters
+    // -------------------------------
+
+    /**
+     * Sets the broker URL (compulsory).
+     *
+     * @param brokerUrl The Broker URL (compulsory).
+     */
+    public void setBrokerUrl(String brokerUrl) {
+        this.brokerUrl = brokerUrl;
+    }
+
+    /**
+     * Gets the broker URL.
+     *
+     * @return The Broker URL.
+     */
+    public String getBrokerUrl() {
+        return brokerUrl;
+    }
+
+    /**
+     * Sets the topic to subscribe to, if a single topic.
+     *
+     * @param topic The topic to subscribe to.
+     */
+    public void setTopic(String topic) {
+        this.topic = topic;
+    }
+
+    /**
+     * Gets the subscribed topic.
+     *
+     * @return The subscribed topic.
+     */
+    public String getTopic() {
+        return topic;
+    }
+
+    /**
+     * Sets the quality of service to use for a single topic subscription (optional).
+     *
+     * @param qualityOfService The quality of service.
+     */
+    public void setQualityOfService(Integer qualityOfService) {
+        this.qualityOfService = qualityOfService;
+    }
+
+    /**
+     * Gets the quality of service set by the user for a single topic consumption.
+     *
+     * @return The quality of service.
+     */
+    public Integer getQualityOfService() {
+        return qualityOfService;
+    }
+
+    /**
+     * Sets the topics to subscribe to, if many.
+     *
+     * @param topics The topics.
+     */
+    public void setTopics(List<String> topics) {
+        this.topics = topics;
+    }
+
+    /**
+     * Gets the topics subscribed to.
+     *
+     * @return The topics subscribed to.
+     */
+    public List<String> getTopics() {
+        return topics;
+    }
+
+    /**
+     * Sets the qualities of service to use for multiple topic subscriptions. If specified, the list must contain the
+     * same number of elements as {@link #topics}.
+     *
+     * @param qualitiesOfService The qualities of service.
+     */
+    public void setQualitiesOfService(List<Integer> qualitiesOfService) {
+        this.qualitiesOfService = qualitiesOfService;
+    }
+
+    /**
+     * Gets the qualities of service for multiple topics.
+     *
+     * @return The qualities of service.
+     */
+    public List<Integer> getQualitiesOfService() {
+        return qualitiesOfService;
+    }
+
+    /**
+     * Sets the MQTT client ID (optional). If one is not provided, the streamer will generate one and will maintain
+     * it througout any reconnection attempts.
+     *
+     * @param clientId The client ID.
+     */
+    public void setClientId(String clientId) {
+        this.clientId = clientId;
+    }
+
+    /**
+     * Gets the client ID, either the one set by the user or the automatically generated one.
+     *
+     * @return The client ID.
+     */
+    public String getClientId() {
+        return clientId;
+    }
+
+    /**
+     * Gets the currently set persistence mechanism.
+     *
+     * @return The persistence mechanism.
+     */
+    public MqttClientPersistence getPersistence() {
+        return persistence;
+    }
+
+    /**
+     * Sets the persistence mechanism. If not set, Paho will use its default.
+     *
+     * @param persistence A configurable persistence mechanism.
+     */
+    public void setPersistence(MqttClientPersistence persistence) {
+        this.persistence = persistence;
+    }
+
+    /**
+     * Gets the currently used MQTT client connect options.
+     *
+     * @return The MQTT client connect options.
+     */
+    public MqttConnectOptions getConnectOptions() {
+        return connectOptions;
+    }
+
+    /**
+     * Sets the MQTT client connect options, where users can configured the last will and testament, durability, etc.
+     *
+     * @param connectOptions The MQTT client connect options.
+     */
+    public void setConnectOptions(MqttConnectOptions connectOptions) {
+        this.connectOptions = connectOptions;
+    }
+
+    /**
+     * Sets whether to disconnect forcibly or not when shutting down. By default, it's {@code false}.
+     *
+     * @param disconnectForcibly Whether to disconnect forcibly or not. By default, it's {@code false}.
+     */
+    public void setDisconnectForcibly(boolean disconnectForcibly) {
+        this.disconnectForcibly = disconnectForcibly;
+    }
+
+    /**
+     * Gets whether this MQTT client will disconnect forcibly when shutting down.
+     *
+     * @return Whether to disconnect forcibly or not.
+     */
+    public boolean isDisconnectForcibly() {
+        return disconnectForcibly;
+    }
+
+    /**
+     * Sets the quiesce timeout on disconnection. If not provided, this streamer won't use any.
+     *
+     * @param disconnectQuiesceTimeout The disconnect quiesce timeout.
+     */
+    public void setDisconnectQuiesceTimeout(Integer disconnectQuiesceTimeout) {
+        this.disconnectQuiesceTimeout = disconnectQuiesceTimeout;
+    }
+
+    /**
+     * Gets the disconnect quiesce timeout.
+     *
+     * @return The disconnect quiesce timeout.
+     */
+    public Integer getDisconnectQuiesceTimeout() {
+        return disconnectQuiesceTimeout;
+    }
+
+    /**
+     * Sets the timeout if disconnecting forcibly. Compulsory in that case.
+     *
+     * @param disconnectForciblyTimeout The disconnect forcibly timeout.
+     */
+    public void setDisconnectForciblyTimeout(Integer disconnectForciblyTimeout) {
+        this.disconnectForciblyTimeout = disconnectForciblyTimeout;
+    }
+
+    /**
+     * Gets the timeout if disconnecting forcibly.
+     *
+     * @return Timeout.
+     */
+    public Integer getDisconnectForciblyTimeout() {
+        return disconnectForciblyTimeout;
+    }
+
+    /**
+     * Sets the strategy to determine how long to wait between retry attempts. By default, this streamer uses a
+     * Fibonacci-based strategy.
+     *
+     * @param retryWaitStrategy The retry wait strategy.
+     */
+    public void setRetryWaitStrategy(WaitStrategy retryWaitStrategy) {
+        this.retryWaitStrategy = retryWaitStrategy;
+    }
+
+    /**
+     * Gets the retry wait strategy.
+     *
+     * @return The retry wait strategy.
+     */
+    public WaitStrategy getRetryWaitStrategy() {
+        return retryWaitStrategy;
+    }
+
+    /**
+     * Sets the strategy to determine when to stop retrying to (re-)connect. By default, we never stop.
+     *
+     * @param retryStopStrategy The retry stop strategy.
+     */
+    public void setRetryStopStrategy(StopStrategy retryStopStrategy) {
+        this.retryStopStrategy = retryStopStrategy;
+    }
+
+    /**
+     * Gets the retry stop strategy.
+     *
+     * @return The retry stop strategy.
+     */
+    public StopStrategy getRetryStopStrategy() {
+        return retryStopStrategy;
+    }
+
+    /**
+     * Sets whether to block the start() method until connected for the first time. By default, it's {@code false}.
+     *
+     * @param blockUntilConnected Whether to block or not.
+     */
+    public void setBlockUntilConnected(boolean blockUntilConnected) {
+        this.blockUntilConnected = blockUntilConnected;
+    }
+
+    /**
+     * Gets whether to block the start() method until connected for the first time. By default, it's {@code false}.
+     *
+     * @return {@code true} if should connect synchronously in start.
+     */
+    public boolean isBlockUntilConnected() {
+        return blockUntilConnected;
+    }
+
+    /**
+     * Returns whether this streamer is stopped.
+     *
+     * @return {@code true} if stopped; {@code false} if not.
+     */
+    public boolean isStopped() {
+        return stopped;
+    }
+
+    /**
+     * Returns whether this streamer is connected by delegating to the underlying {@link MqttClient#isConnected()}
+     *
+     * @return {@code true} if connected; {@code false} if not.
+     * @see MqttClient#isConnected()
+     */
+    public boolean isConnected() {
+        return client.isConnected();
+    }
+
+    /**
+     * A utility class to help us with (re-)connecting to the MQTT broker. It uses a single-threaded executor to perform
+     * the (re-)connections.
+     */
+    private class MqttConnectionRetrier {
+        /** The guava-retrying retrier object. */
+        private final Retryer<Void> retrier;
+
+        /** Single-threaded pool. */
+        private final ExecutorService exec = Executors.newSingleThreadExecutor();
+
+        /**
+         * Constructor.
+         *
+         * @param retrier The retryier object.
+         */
+        public MqttConnectionRetrier(Retryer<Void> retrier) {
+            this.retrier = retrier;
+        }
+
+        /**
+         * Method called by the streamer to ask us to (re-)connect.
+         */
+        public void connect() {
+            Callable<Void> callable = retrier.wrap(new Callable<Void>() {
+                @Override public Void call() throws Exception {
+                    // If we're already connected, return immediately.
+                    if (client.isConnected())
+                        return null;
+
+                    if (stopped)
+                        return null;
+
+                    // Connect to broker.
+                    if (connectOptions == null)
+                        client.connect();
+                    else
+                        client.connect(connectOptions);
+
+                    // Always use the multiple topics variant of the mqtt client; even if the user specified a single
+                    // topic and/or QoS, the initialization code would have placed it inside the 1..n structures.
+                    if (qualitiesOfService.isEmpty())
+                        client.subscribe(topics.toArray(new String[0]));
+
+                    else {
+                        int[] qoses = new int[qualitiesOfService.size()];
+
+                        for (int i = 0; i < qualitiesOfService.size(); i++)
+                            qoses[i] = qualitiesOfService.get(i);
+
+                        client.subscribe(topics.toArray(new String[0]), qoses);
+                    }
+
+                    if (log.isInfoEnabled())
+                        log.info("MQTT Streamer (re-)connected and subscribed " + cachedLogValues);
+
+                    return null;
+                }
+            });
+
+            Future<Void> result = exec.submit(callable);
+
+            if (blockUntilConnected) {
+                try {
+                    result.get();
+                }
+                catch (Throwable e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        }
+
+        /**
+         * Stops this connection utility class by shutting down the thread pool.
+         */
+        public void stop() {
+            exec.shutdownNow();
+        }
+    }
+}
diff --git a/modules/mqtt-ext/src/main/java/org/apache/ignite/stream/mqtt/package-info.java b/modules/mqtt-ext/src/main/java/org/apache/ignite/stream/mqtt/package-info.java
new file mode 100644
index 0000000..9fec7fa
--- /dev/null
+++ b/modules/mqtt-ext/src/main/java/org/apache/ignite/stream/mqtt/package-info.java
@@ -0,0 +1,22 @@
+/*
+ *  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.
+ */
+
+/**
+ * Contains implementation of MQTT topic messages consumer.
+ */
+
+package org.apache.ignite.stream.mqtt;
diff --git a/modules/mqtt-ext/src/test/java/org/apache/ignite/stream/mqtt/IgniteMqttStreamerTest.java b/modules/mqtt-ext/src/test/java/org/apache/ignite/stream/mqtt/IgniteMqttStreamerTest.java
new file mode 100644
index 0000000..c024595
--- /dev/null
+++ b/modules/mqtt-ext/src/test/java/org/apache/ignite/stream/mqtt/IgniteMqttStreamerTest.java
@@ -0,0 +1,649 @@
+/*
+ * 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.ignite.stream.mqtt;
+
+import java.net.ServerSocket;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeSet;
+import java.util.UUID;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.activemq.broker.BrokerService;
+import org.apache.activemq.broker.region.policy.PolicyEntry;
+import org.apache.activemq.broker.region.policy.PolicyMap;
+import org.apache.activemq.command.ActiveMQTopic;
+import org.apache.ignite.Ignite;
+import org.apache.ignite.IgniteCache;
+import org.apache.ignite.IgniteDataStreamer;
+import org.apache.ignite.cache.CachePeekMode;
+import org.apache.ignite.configuration.IgniteConfiguration;
+import org.apache.ignite.events.CacheEvent;
+import org.apache.ignite.events.EventType;
+import org.apache.ignite.internal.util.lang.GridMapEntry;
+import org.apache.ignite.internal.util.typedef.F;
+import org.apache.ignite.lang.IgniteBiPredicate;
+import org.apache.ignite.lang.IgniteInClosure;
+import org.apache.ignite.stream.StreamMultipleTupleExtractor;
+import org.apache.ignite.stream.StreamSingleTupleExtractor;
+import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
+
+import com.github.rholder.retry.StopStrategies;
+import com.github.rholder.retry.WaitStrategies;
+import com.google.common.base.Splitter;
+import org.eclipse.paho.client.mqttv3.MqttClient;
+import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
+import org.eclipse.paho.client.mqttv3.MqttException;
+import org.eclipse.paho.client.mqttv3.MqttMessage;
+import org.eclipse.paho.client.mqttv3.persist.MemoryPersistence;
+import org.junit.Ignore;
+import org.junit.Test;
+
+import static org.apache.ignite.events.EventType.EVT_CACHE_OBJECT_PUT;
+
+/**
+ * Test for {@link MqttStreamer}.
+ */
+public class IgniteMqttStreamerTest extends GridCommonAbstractTest {
+    /** The test data. */
+    private static final Map<Integer, String> TEST_DATA = new HashMap<>();
+
+    /** Topic name for single topic tests. */
+    private static final String SINGLE_TOPIC_NAME = "abc";
+
+    /** Topic names for multiple topic tests. */
+    private static final List<String> MULTIPLE_TOPIC_NAMES = Arrays.asList("def", "ghi", "jkl", "mno");
+
+    /** The AMQ broker with an MQTT interface. */
+    private BrokerService broker;
+
+    /** The MQTT client. */
+    private MqttClient client;
+
+    /** The broker URL. */
+    private String brokerUrl;
+
+    /** The broker port. **/
+    private int port;
+
+    /** The MQTT streamer currently under test. */
+    private MqttStreamer<Integer, String> streamer;
+
+    /** The UUID of the currently active remote listener. */
+    private UUID remoteLsnr;
+
+    /** The Ignite data streamer. */
+    private IgniteDataStreamer<Integer, String> dataStreamer;
+
+    static {
+        for (int i = 0; i < 100; i++)
+            TEST_DATA.put(i, "v" + i);
+    }
+
+    /** Constructor. */
+    public IgniteMqttStreamerTest() {
+        super(true);
+    }
+
+    /** {@inheritDoc} */
+    @Override protected IgniteConfiguration getConfiguration(String igniteInstanceName) throws Exception {
+        return super.getConfiguration(igniteInstanceName).setIncludeEventTypes(EventType.EVTS_ALL);
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @SuppressWarnings("unchecked")
+    @Override public void beforeTest() throws Exception {
+        grid().<Integer, String>getOrCreateCache(defaultCacheConfiguration());
+
+        // find an available local port
+        try (ServerSocket ss = new ServerSocket(0)) {
+            port = ss.getLocalPort();
+        }
+
+        // create the broker
+        broker = new BrokerService();
+        broker.setDeleteAllMessagesOnStartup(true);
+        broker.setPersistent(false);
+        broker.setPersistenceAdapter(null);
+        broker.setPersistenceFactory(null);
+
+        PolicyMap plcMap = new PolicyMap();
+        PolicyEntry plc = new PolicyEntry();
+
+        plc.setQueuePrefetch(1);
+
+        broker.setDestinationPolicy(plcMap);
+        broker.getDestinationPolicy().setDefaultEntry(plc);
+        broker.setSchedulerSupport(false);
+
+        // add the MQTT transport connector to the broker
+        broker.addConnector("mqtt://localhost:" + port);
+        broker.setStartAsync(false);
+        broker.start(true);
+
+        // create the broker URL
+        brokerUrl = "tcp://localhost:" + port;
+
+        // create the client and connect
+        client = new MqttClient(brokerUrl, UUID.randomUUID().toString(), new MemoryPersistence());
+
+        client.connect();
+
+        // create mqtt streamer
+        dataStreamer = grid().dataStreamer(DEFAULT_CACHE_NAME);
+
+        streamer = createMqttStreamer(dataStreamer);
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Override public void afterTest() throws Exception {
+        try {
+            streamer.stop();
+        }
+        catch (Exception ignored) {
+            // ignore if already stopped
+        }
+
+        dataStreamer.close();
+
+        grid().cache(DEFAULT_CACHE_NAME).clear();
+
+        broker.stop();
+        broker.deleteAllMessages();
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testConnectDisconnect() throws Exception {
+        // configure streamer
+        streamer.setSingleTupleExtractor(singleTupleExtractor());
+        streamer.setTopic(SINGLE_TOPIC_NAME);
+        streamer.setBlockUntilConnected(true);
+
+        // action time: repeat 10 times; make sure the connection state is kept correctly every time
+        for (int i = 0; i < 10; i++) {
+            streamer.start();
+
+            assertTrue(streamer.isConnected());
+
+            streamer.stop();
+
+            assertFalse(streamer.isConnected());
+        }
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Ignore("https://issues.apache.org/jira/browse/IGNITE-2255")
+    @Test
+    public void testConnectionStatusWithBrokerDisconnection() throws Exception {
+        // Configure streamer.
+        streamer.setSingleTupleExtractor(singleTupleExtractor());
+        streamer.setTopic(SINGLE_TOPIC_NAME);
+        streamer.setBlockUntilConnected(true);
+        streamer.setRetryWaitStrategy(WaitStrategies.noWait());
+
+        streamer.start();
+
+        // Action time: repeat 5 times; make sure the connection state is kept correctly every time.
+        for (int i = 0; i < 5; i++) {
+            log.info("Iteration: " + i);
+
+            assertTrue(streamer.isConnected());
+
+            broker.stop();
+
+            assertFalse(streamer.isConnected());
+
+            broker.start(true);
+            broker.waitUntilStarted();
+
+            Thread.sleep(500);
+        }
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testSingleTopic_NoQoS_OneEntryPerMessage() throws Exception {
+        // configure streamer
+        streamer.setSingleTupleExtractor(singleTupleExtractor());
+        streamer.setTopic(SINGLE_TOPIC_NAME);
+
+        // subscribe to cache PUT events
+        CountDownLatch latch = subscribeToPutEvents(50);
+
+        // action time
+        streamer.start();
+
+        // send messages
+        sendMessages(Arrays.asList(SINGLE_TOPIC_NAME), 0, 50, false);
+
+        // assertions
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(50);
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testMultipleTopics_NoQoS_OneEntryPerMessage() throws Exception {
+        // configure streamer
+        streamer.setSingleTupleExtractor(singleTupleExtractor());
+        streamer.setTopics(MULTIPLE_TOPIC_NAMES);
+
+        // subscribe to cache PUT events
+        CountDownLatch latch = subscribeToPutEvents(50);
+
+        // action time
+        streamer.start();
+
+        // send messages
+        sendMessages(MULTIPLE_TOPIC_NAMES, 0, 50, false);
+
+        // assertions
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(50);
+
+        assertTrue(broker.getBroker().getDestinationMap().size() >= 4);
+        assertTrue(broker.getBroker().getDestinationMap().containsKey(new ActiveMQTopic("def")));
+        assertTrue(broker.getBroker().getDestinationMap().containsKey(new ActiveMQTopic("ghi")));
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testSingleTopic_NoQoS_MultipleEntriesOneMessage() throws Exception {
+        // configure streamer
+        streamer.setMultipleTupleExtractor(multipleTupleExtractor());
+        streamer.setTopic(SINGLE_TOPIC_NAME);
+
+        // subscribe to cache PUT events
+        CountDownLatch latch = subscribeToPutEvents(50);
+
+        // action time
+        streamer.start();
+
+        // send messages
+        sendMessages(Arrays.asList(SINGLE_TOPIC_NAME), 0, 50, true);
+
+        // assertions
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(50);
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testMultipleTopics_NoQoS_MultipleEntriesOneMessage() throws Exception {
+        // configure streamer
+        streamer.setMultipleTupleExtractor(multipleTupleExtractor());
+        streamer.setTopics(MULTIPLE_TOPIC_NAMES);
+
+        // subscribe to cache PUT events
+        CountDownLatch latch = subscribeToPutEvents(50);
+
+        // action time
+        streamer.start();
+
+        // send messages
+        sendMessages(MULTIPLE_TOPIC_NAMES, 0, 50, true);
+
+        // assertions
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(50);
+
+        assertTrue(broker.getBroker().getDestinationMap().size() >= 4);
+        assertTrue(broker.getBroker().getDestinationMap().containsKey(new ActiveMQTopic("def")));
+        assertTrue(broker.getBroker().getDestinationMap().containsKey(new ActiveMQTopic("ghi")));
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testSingleTopic_NoQoS_ConnectOptions_Durable() throws Exception {
+        // configure streamer
+        streamer.setSingleTupleExtractor(singleTupleExtractor());
+        streamer.setTopic(SINGLE_TOPIC_NAME);
+
+        MqttConnectOptions connOptions = new MqttConnectOptions();
+        connOptions.setCleanSession(false);
+        streamer.setConnectOptions(connOptions);
+
+        // subscribe to cache PUT events
+        CountDownLatch latch = subscribeToPutEvents(50);
+
+        // action time
+        streamer.start();
+
+        // send messages
+        sendMessages(Arrays.asList(SINGLE_TOPIC_NAME), 0, 50, false);
+
+        // assertions
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(50);
+
+        // explicitly stop the streamer
+        streamer.stop();
+
+        // send messages while stopped
+        sendMessages(Arrays.asList(SINGLE_TOPIC_NAME), 50, 50, false);
+
+        latch = subscribeToPutEvents(50);
+
+        // start the streamer again
+        streamer.start();
+
+        // assertions - make sure that messages sent during disconnection were also received
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(100);
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testSingleTopic_NoQoS_Reconnect() throws Exception {
+        // configure streamer
+        streamer.setSingleTupleExtractor(singleTupleExtractor());
+        streamer.setRetryWaitStrategy(WaitStrategies.noWait());
+        streamer.setRetryStopStrategy(StopStrategies.neverStop());
+        streamer.setTopic(SINGLE_TOPIC_NAME);
+
+        // subscribe to cache PUT events
+        CountDownLatch latch = subscribeToPutEvents(50);
+
+        // action time
+        streamer.start();
+
+        // send messages
+        sendMessages(Arrays.asList(SINGLE_TOPIC_NAME), 0, 50, false);
+
+        // assertions
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(50);
+
+        // now shutdown the broker, wait 2 seconds and start it again
+        broker.stop();
+        broker.start(true);
+        broker.waitUntilStarted();
+
+        Thread.sleep(2000);
+
+        client.connect();
+
+        // let's ensure we have 2 connections: Ignite and our test
+        assertEquals(2, broker.getTransportConnectorByScheme("mqtt").getConnections().size());
+
+        // subscribe to cache PUT events again
+        latch = subscribeToPutEvents(50);
+
+        // send messages
+        sendMessages(Arrays.asList(SINGLE_TOPIC_NAME), 50, 50, false);
+
+        // assertions
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(100);
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testSingleTopic_NoQoS_RetryOnce() throws Exception {
+        // configure streamer
+        streamer.setSingleTupleExtractor(singleTupleExtractor());
+        streamer.setRetryWaitStrategy(WaitStrategies.noWait());
+        streamer.setRetryStopStrategy(StopStrategies.stopAfterAttempt(1));
+        streamer.setTopic(SINGLE_TOPIC_NAME);
+
+        // subscribe to cache PUT events
+        CountDownLatch latch = subscribeToPutEvents(50);
+
+        // action time
+        streamer.start();
+
+        // send messages
+        sendMessages(Arrays.asList(SINGLE_TOPIC_NAME), 0, 50, false);
+
+        // assertions
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(50);
+
+        // now shutdown the broker, wait 2 seconds and start it again
+        broker.stop();
+        broker.start(true);
+
+        broker.waitUntilStarted();
+
+        client.connect();
+
+        // lets send messages and ensure they are not received, because our retrier desisted
+        sendMessages(Arrays.asList(SINGLE_TOPIC_NAME), 50, 50, false);
+
+        Thread.sleep(3000);
+
+        assertNull(grid().cache(DEFAULT_CACHE_NAME).get(50));
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testMultipleTopics_MultipleQoS_OneEntryPerMessage() throws Exception {
+        // configure streamer
+        streamer.setSingleTupleExtractor(singleTupleExtractor());
+        streamer.setTopics(MULTIPLE_TOPIC_NAMES);
+        streamer.setQualitiesOfService(Arrays.asList(1, 1, 1, 1));
+
+        // subscribe to cache PUT events
+        CountDownLatch latch = subscribeToPutEvents(50);
+
+        // action time
+        streamer.start();
+
+        // send messages
+        sendMessages(MULTIPLE_TOPIC_NAMES, 0, 50, false);
+
+        // assertions
+        assertTrue(latch.await(10, TimeUnit.SECONDS));
+        assertCacheEntriesLoaded(50);
+
+        assertTrue(broker.getBroker().getDestinationMap().size() >= 4);
+        assertTrue(broker.getBroker().getDestinationMap().containsKey(new ActiveMQTopic("def")));
+        assertTrue(broker.getBroker().getDestinationMap().containsKey(new ActiveMQTopic("ghi")));
+    }
+
+    /**
+     * @throws Exception If failed.
+     */
+    @Test
+    public void testMultipleTopics_MultipleQoS_Mismatch() throws Exception {
+        // configure streamer
+        streamer.setSingleTupleExtractor(singleTupleExtractor());
+        streamer.setTopics(MULTIPLE_TOPIC_NAMES);
+        streamer.setQualitiesOfService(Arrays.asList(1, 1, 1));
+
+        try {
+            streamer.start();
+        }
+        catch (Exception ignored) {
+            return;
+        }
+
+        fail("Expected an exception reporting invalid parameters");
+    }
+
+    /**
+     * @param dataStreamer Streamer.
+     * @return MQTT streamer.
+     */
+    private MqttStreamer<Integer, String> createMqttStreamer(IgniteDataStreamer<Integer, String> dataStreamer) {
+        MqttStreamer<Integer, String> streamer = new MqttStreamer<>();
+        streamer.setIgnite(grid());
+        streamer.setStreamer(dataStreamer);
+        streamer.setBrokerUrl(brokerUrl);
+        streamer.setClientId(UUID.randomUUID().toString());
+        streamer.setBlockUntilConnected(true);
+
+        dataStreamer.allowOverwrite(true);
+        dataStreamer.autoFlushFrequency(1);
+
+        return streamer;
+    }
+
+    /**
+     * @param topics Topics.
+     * @param fromIdx From index.
+     * @param cnt Count.
+     * @param singleMsg Single message flag.
+     * @throws MqttException If failed.
+     */
+    private void sendMessages(final List<String> topics, int fromIdx, int cnt, boolean singleMsg)
+        throws MqttException {
+        if (singleMsg) {
+            final List<StringBuilder> sbs = new ArrayList<>(topics.size());
+
+            // initialize String Builders for each topic
+            F.forEach(topics, new IgniteInClosure<String>() {
+                @Override public void apply(String s) {
+                    sbs.add(new StringBuilder());
+                }
+            });
+
+            // fill String Builders for each topic
+            F.forEach(F.range(fromIdx, fromIdx + cnt), new IgniteInClosure<Integer>() {
+                @Override public void apply(Integer integer) {
+                    sbs.get(integer % topics.size()).append(integer.toString() + "," + TEST_DATA.get(integer) + "\n");
+                }
+            });
+
+            // send each buffer out
+            for (int i = 0; i < topics.size(); i++) {
+                MqttMessage msg = new MqttMessage(sbs.get(i).toString().getBytes());
+
+                client.publish(topics.get(i % topics.size()), msg);
+            }
+        }
+        else {
+            for (int i = fromIdx; i < fromIdx + cnt; i++) {
+                byte[] payload = (i + "," + TEST_DATA.get(i)).getBytes();
+
+                MqttMessage msg = new MqttMessage(payload);
+
+                client.publish(topics.get(i % topics.size()), msg);
+            }
+        }
+    }
+
+    /**
+     * @param expect Expected count.
+     * @return Latch to be counted down in listener.
+     */
+    private CountDownLatch subscribeToPutEvents(int expect) {
+        Ignite ignite = grid();
+
+        // Listen to cache PUT events and expect as many as messages as test data items
+        final CountDownLatch latch = new CountDownLatch(expect);
+
+        IgniteBiPredicate<UUID, CacheEvent> cb = new IgniteBiPredicate<UUID, CacheEvent>() {
+            @Override public boolean apply(UUID uuid, CacheEvent evt) {
+                latch.countDown();
+
+                return true;
+            }
+        };
+
+        remoteLsnr = ignite.events(ignite.cluster().forCacheNodes(DEFAULT_CACHE_NAME))
+            .remoteListen(cb, null, EVT_CACHE_OBJECT_PUT);
+
+        return latch;
+    }
+
+    /**
+     * @param cnt Count.
+     */
+    private void assertCacheEntriesLoaded(int cnt) {
+        // get the cache and check that the entries are present
+        IgniteCache<Integer, String> cache = grid().cache(DEFAULT_CACHE_NAME);
+
+        // for each key from 0 to count from the TEST_DATA (ordered by key), check that the entry is present in cache
+        for (Integer key : new ArrayList<>(new TreeSet<>(TEST_DATA.keySet())).subList(0, cnt))
+            assertEquals(TEST_DATA.get(key), cache.get(key));
+
+        // assert that the cache exactly the specified amount of elements
+        assertEquals(cnt, cache.size(CachePeekMode.ALL));
+
+        // remove the event listener
+        grid().events(grid().cluster().forCacheNodes(DEFAULT_CACHE_NAME)).stopRemoteListen(remoteLsnr);
+    }
+
+    /**
+     * @return {@link StreamSingleTupleExtractor} for testing.
+     */
+    public static StreamSingleTupleExtractor<MqttMessage, Integer, String> singleTupleExtractor() {
+        return new StreamSingleTupleExtractor<MqttMessage, Integer, String>() {
+            @Override public Map.Entry<Integer, String> extract(MqttMessage msg) {
+                List<String> s = Splitter.on(",").splitToList(new String(msg.getPayload()));
+
+                return new GridMapEntry<>(Integer.parseInt(s.get(0)), s.get(1));
+            }
+        };
+    }
+
+    /**
+     * @return {@link StreamMultipleTupleExtractor} for testing.
+     */
+    public static StreamMultipleTupleExtractor<MqttMessage, Integer, String> multipleTupleExtractor() {
+        return new StreamMultipleTupleExtractor<MqttMessage, Integer, String>() {
+            @Override public Map<Integer, String> extract(MqttMessage msg) {
+                final Map<String, String> map = Splitter.on("\n")
+                    .omitEmptyStrings()
+                    .withKeyValueSeparator(",")
+                    .split(new String(msg.getPayload()));
+
+                final Map<Integer, String> answer = new HashMap<>();
+
+                F.forEach(map.keySet(), new IgniteInClosure<String>() {
+                    @Override public void apply(String s) {
+                        answer.put(Integer.parseInt(s), map.get(s));
+                    }
+                });
+
+                return answer;
+            }
+        };
+    }
+
+}
diff --git a/modules/mqtt-ext/src/test/java/org/apache/ignite/stream/mqtt/IgniteMqttStreamerTestSuite.java b/modules/mqtt-ext/src/test/java/org/apache/ignite/stream/mqtt/IgniteMqttStreamerTestSuite.java
new file mode 100644
index 0000000..ed0c2f7
--- /dev/null
+++ b/modules/mqtt-ext/src/test/java/org/apache/ignite/stream/mqtt/IgniteMqttStreamerTestSuite.java
@@ -0,0 +1,32 @@
+/*
+ * 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.ignite.stream.mqtt;
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Suite;
+
+/**
+ * MQTT streamer tests.
+ */
+@RunWith(Suite.class)
+@Suite.SuiteClasses({
+    IgniteMqttStreamerTest.class
+})
+public class IgniteMqttStreamerTestSuite {
+
+}
diff --git a/modules/mqtt-ext/src/test/java/org/apache/ignite/stream/mqtt/package-info.java b/modules/mqtt-ext/src/test/java/org/apache/ignite/stream/mqtt/package-info.java
new file mode 100644
index 0000000..9fec7fa
--- /dev/null
+++ b/modules/mqtt-ext/src/test/java/org/apache/ignite/stream/mqtt/package-info.java
@@ -0,0 +1,22 @@
+/*
+ *  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.
+ */
+
+/**
+ * Contains implementation of MQTT topic messages consumer.
+ */
+
+package org.apache.ignite.stream.mqtt;
diff --git a/pom.xml b/pom.xml
index 4fd028d..d2d14bc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -50,6 +50,7 @@
         <module>modules/zeromq-ext</module>
         <module>modules/twitter-ext</module>
         <module>modules/rocketmq-ext</module>
+        <module>modules/mqtt-ext</module>
     </modules>
 
     <profiles>


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