IGNITE-12262 Implement a Pub/Sub Data Streamer - Fixes #2.

Signed-off-by: samaitra <saikat.maitra@gmail.com>
diff --git a/modules/pub-sub/README.txt b/modules/pub-sub/README.txt
new file mode 100644
index 0000000..65e7754
--- /dev/null
+++ b/modules/pub-sub/README.txt
@@ -0,0 +1,33 @@
+Apache Ignite Pub/Sub Module
+-----------------------------------
+
+Pub/Sub module is a streaming connector to inject Pub/Sub data into Ignite cache.
+
+Starting data transfer to Ignite can be done with the following steps.
+
+1. Import Ignite Pub/Sub Module in Maven Project
+
+If you are using Maven to manage dependencies of your project, you can add Pub/Sub module
+dependency like this (replace '${ignite.version}' with actual Ignite version you are
+interested in):
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
+                        http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    ...
+    <dependencies>
+        ...
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-pub-sub</artifactId>
+            <version>${ignite.version}</version>
+        </dependency>
+        ...
+    </dependencies>
+    ...
+</project>
+
+2. Create an Ignite configuration file (see example-ignite.xml) and make sure it is accessible from the sink.
+
+3. Make sure your data input to the sink is specified. For example `input.addSink(igniteSinkObject)`
diff --git a/modules/pub-sub/config/example-ignite.xml b/modules/pub-sub/config/example-ignite.xml
new file mode 100644
index 0000000..d4f4dc1
--- /dev/null
+++ b/modules/pub-sub/config/example-ignite.xml
@@ -0,0 +1,73 @@
+<?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.
+-->
+
+<!--
+    Ignite configuration with all defaults and enabled events.
+    Used for testing IgniteSink running Ignite in a client mode.
+-->
+<beans xmlns="http://www.springframework.org/schema/beans"
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns:util="http://www.springframework.org/schema/util"
+       xsi:schemaLocation="
+        http://www.springframework.org/schema/beans
+        http://www.springframework.org/schema/beans/spring-beans.xsd
+        http://www.springframework.org/schema/util
+        http://www.springframework.org/schema/util/spring-util.xsd">
+    <bean id="ignite.cfg" class="org.apache.ignite.configuration.IgniteConfiguration">
+        <!-- Enable client mode. -->
+        <property name="clientMode" value="false"/>
+
+        <!-- Cache accessed from IgniteSink. -->
+        <property name="cacheConfiguration">
+            <list>
+                <!-- Partitioned cache example configuration with configurations adjusted to server nodes'. -->
+                <bean class="org.apache.ignite.configuration.CacheConfiguration">
+                    <property name="atomicityMode" value="ATOMIC"/>
+                    <property name="name" value="testCache"/>
+                </bean>
+            </list>
+        </property>
+
+        <!-- Enable cache events. -->
+        <property name="includeEventTypes">
+            <list>
+                <!-- Cache events (only EVT_CACHE_OBJECT_PUT for tests). -->
+                <util:constant static-field="org.apache.ignite.events.EventType.EVT_CACHE_OBJECT_PUT"/>
+                <util:constant static-field="org.apache.ignite.events.EventType.EVT_CACHE_OBJECT_READ"/>
+                <util:constant static-field="org.apache.ignite.events.EventType.EVT_CACHE_OBJECT_REMOVED"/>
+
+            </list>
+        </property>
+
+        <!-- Explicitly configure TCP discovery SPI to provide list of initial nodes. -->
+        <property name="discoverySpi">
+            <bean class="org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi">
+                <property name="ipFinder">
+                    <bean class="org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder">
+                        <property name="addresses">
+                            <list>
+                                <value>127.0.0.1:47500..47509</value>
+                            </list>
+                        </property>
+                    </bean>
+                </property>
+            </bean>
+        </property>
+    </bean>
+</beans>
diff --git a/modules/pub-sub/licenses/apache-2.0.txt b/modules/pub-sub/licenses/apache-2.0.txt
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/modules/pub-sub/licenses/apache-2.0.txt
@@ -0,0 +1,202 @@
+
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diff --git a/modules/pub-sub/pom.xml b/modules/pub-sub/pom.xml
new file mode 100644
index 0000000..8ef0b07
--- /dev/null
+++ b/modules/pub-sub/pom.xml
@@ -0,0 +1,102 @@
+<?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-parent</artifactId>
+        <version>1</version>
+        <relativePath>../../parent</relativePath>
+    </parent>
+
+    <artifactId>ignite-pub-sub</artifactId>
+    <version>2.9.0-SNAPSHOT</version>
+    <url>http://ignite.apache.org</url>
+
+    <properties>
+        <pubsub.version>1.102.0</pubsub.version>
+        <ignite-core.version>2.9.0-SNAPSHOT</ignite-core.version>
+        <ignite-log4j.version>2.9.0-SNAPSHOT</ignite-log4j.version>
+        <ignite-spring.version>2.9.0-SNAPSHOT</ignite-spring.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-core</artifactId>
+            <version>${ignite-core.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.google.cloud</groupId>
+            <artifactId>google-cloud-pubsub</artifactId>
+            <version>${pubsub.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-core</artifactId>
+            <version>${ignite-core.version}</version>
+            <type>test-jar</type>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-spring</artifactId>
+            <version>${ignite-spring.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.ignite</groupId>
+            <artifactId>ignite-log4j</artifactId>
+            <version>${ignite-log4j.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <!--
+        <dependency>
+            <groupId>org.easymock</groupId>
+        -->
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>${mockito.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+
+    <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>
\ No newline at end of file
diff --git a/modules/pub-sub/src/main/java/org/apache/ignite/stream/pubsub/PubSubStreamer.java b/modules/pub-sub/src/main/java/org/apache/ignite/stream/pubsub/PubSubStreamer.java
new file mode 100644
index 0000000..13384d2
--- /dev/null
+++ b/modules/pub-sub/src/main/java/org/apache/ignite/stream/pubsub/PubSubStreamer.java
@@ -0,0 +1,248 @@
+/*
+ * 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.pubsub;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.IntStream;
+
+import org.apache.ignite.IgniteException;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.IgniteDataStreamer;
+import org.apache.ignite.internal.util.typedef.internal.A;
+import org.apache.ignite.stream.StreamAdapter;
+
+import com.google.cloud.pubsub.v1.stub.GrpcSubscriberStub;
+import com.google.cloud.pubsub.v1.stub.SubscriberStub;
+import com.google.cloud.pubsub.v1.stub.SubscriberStubSettings;
+import com.google.pubsub.v1.ProjectTopicName;
+import com.google.pubsub.v1.PubsubMessage;
+import com.google.pubsub.v1.PullRequest;
+import com.google.pubsub.v1.PullResponse;
+import com.google.pubsub.v1.ReceivedMessage;
+
+import org.apache.ignite.stream.StreamMultipleTupleExtractor;
+import org.apache.ignite.stream.StreamSingleTupleExtractor;
+
+
+/**
+ * Server that subscribes to topic messages from Pub/Sub and streams its to key-value pairs into
+ * {@link IgniteDataStreamer} instance, using Google Cloud Pub/Sub sdk as a Pub/Sub client.
+ * <p>
+ * You must also provide a {@link StreamSingleTupleExtractor} or a {@link StreamMultipleTupleExtractor} to extract
+ * cache tuples out of the incoming message.
+ * <p>
+ */
+public class PubSubStreamer<K,V> extends StreamAdapter<PubsubMessage, K, V> {
+    /** Default max messages. */
+    private static final int DFLT_MAX_MESSAGES = 10;
+
+    /** Logger. */
+    private IgniteLogger log;
+
+    /** Polling tasks executor. */
+    private ExecutorService executor;
+
+    /** Topics. */
+    private List<ProjectTopicName> topics;
+
+    /** Number of threads. */
+    private int threads;
+
+    /** Pub/Sub subscriptionName. */
+    private String subscriptionName;
+
+    /** Pub/Sub subscriberStubSettings*/
+    private SubscriberStubSettings subscriberStubSettings;
+
+    /** Return policy on unavailable messages. */
+    private boolean returnImmediately = false;
+
+    /** Pub/Sub maxMessages. */
+    private int maxMessages = DFLT_MAX_MESSAGES;
+
+    /** Pub/Sub consumer tasks. */
+    private final List<ConsumerTask> consumerTasks = new ArrayList<>();
+
+    /**
+     * Sets the topic names.
+     *
+     * @param topics Topic names.
+     */
+    public void setTopic(List<ProjectTopicName> topics) {
+        this.topics = topics;
+    }
+
+    /**
+     * Sets the threads.
+     *
+     * @param threads Number of threads.
+     */
+    public void setThreads(int threads) {
+        this.threads = threads;
+    }
+
+    /**
+     * Sets the consumer subscriptionName.
+     *
+     * @param subscriptionName Consumer subscription name.
+     */
+    public void setSubscriptionName(String subscriptionName) {
+        this.subscriptionName = subscriptionName;
+    }
+
+    /**
+     * Sets the consumer Settings
+     * @param subscriberStubSettings Pub/Sub subscriber settings
+     */
+    public void setSubscriberStubSettings(SubscriberStubSettings subscriberStubSettings) {
+        this.subscriberStubSettings = subscriberStubSettings;
+    }
+
+    /**
+     * Sets the return policy for receiving messages on Pub/Sub tasks on message availability.
+     *
+     * @param returnImmediately Pub/Sub waiting policy on message unavailability.
+     */
+    public void setReturnImmediately(boolean returnImmediately) {
+        this.returnImmediately = returnImmediately;
+    }
+
+    /**
+     * Sets the max number of Pub/Sub messages to fetch on pull request
+     * @param maxMessages Pub/Sub messages per pull request
+     */
+    public void setMaxMessages(int maxMessages) {
+        this.maxMessages = maxMessages;
+    }
+
+    /**
+     * Starts streamer.
+     *
+     * @throws IgniteException If failed.
+     */
+    public void start() {
+        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.notNull(topics, "topics");
+        A.notNull(subscriptionName, "Pub/Sub consumer config");
+        A.ensure(threads > 0, "threads > 0");
+
+        log = getIgnite().log();
+
+        executor = Executors.newFixedThreadPool(threads);
+
+        IntStream.range(0, threads).forEach(i -> consumerTasks.add(new ConsumerTask(subscriberStubSettings, subscriptionName, returnImmediately, maxMessages)));
+
+        for (ConsumerTask task : consumerTasks)
+            executor.submit(task);
+    }
+
+    /**
+     * Stops streamer.
+     */
+    public void stop() {
+        for (ConsumerTask task : consumerTasks)
+            task.stop();
+
+        if (executor != null) {
+            executor.shutdown();
+
+            try {
+                if (!executor.awaitTermination(5000, TimeUnit.MILLISECONDS))
+                    if (log.isDebugEnabled())
+                        log.debug("Timed out waiting for consumer threads to shut down, exiting uncleanly.");
+            }
+            catch (InterruptedException ignored) {
+                if (log.isDebugEnabled())
+                    log.debug("Interrupted during shutdown, exiting uncleanly.");
+            }
+        }
+    }
+
+    /** Polling task. */
+    class ConsumerTask implements Callable<Void> {
+        /** Pub/Sub consumer */
+        private final SubscriberStub subscriberStub;
+
+        private final String subscriptionName;
+
+        private final boolean returnImmediately;
+
+        private final int maxMessages;
+
+        /** Stopped. */
+        private volatile boolean stopped;
+
+        public ConsumerTask(SubscriberStubSettings subscriberStubSettings,String subscriptionName, boolean returnImmediately, int maxMessages) throws IgniteException {
+            try {
+
+                this.subscriberStub = GrpcSubscriberStub.create(subscriberStubSettings);
+                this.subscriptionName = subscriptionName;
+                this.returnImmediately = returnImmediately;
+                this.maxMessages = maxMessages;
+            } catch (IOException e) {
+                throw new IgniteException(e);
+            }
+        }
+
+        /** {@inheritDoc} */
+        @Override public Void call() throws Exception {
+
+            try {
+                while (!stopped) {
+                    PullRequest pullRequest =
+                            PullRequest.newBuilder()
+                                       .setMaxMessages(maxMessages)
+                                       .setReturnImmediately(returnImmediately) // return immediately if messages are not available
+                                       .setSubscription(subscriptionName)
+                                       .build();
+
+                    PullResponse pullResponse = subscriberStub.pullCallable().call(pullRequest);
+
+                    for (ReceivedMessage message : pullResponse.getReceivedMessagesList()) {
+                        addMessage(message.getMessage());
+                    }
+                }
+            } finally {
+                subscriberStub.close();
+            }
+
+            return null;
+        }
+
+        /** Stops the polling task. */
+        public void stop() {
+            stopped = true;
+
+            if (subscriberStub!= null) {
+                subscriberStub.shutdown();
+            }
+        }
+    }
+
+}
diff --git a/modules/pub-sub/src/main/java/org/apache/ignite/stream/pubsub/package-info.java b/modules/pub-sub/src/main/java/org/apache/ignite/stream/pubsub/package-info.java
new file mode 100644
index 0000000..9a1461f
--- /dev/null
+++ b/modules/pub-sub/src/main/java/org/apache/ignite/stream/pubsub/package-info.java
@@ -0,0 +1,21 @@
+/*
+ *  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 Pub/Sub Streamer.
+ */
+package org.apache.ignite.stream.pubsub;
diff --git a/modules/pub-sub/src/test/java/org/apache/ignite/stream/pubsub/MockPubSubServer.java b/modules/pub-sub/src/test/java/org/apache/ignite/stream/pubsub/MockPubSubServer.java
new file mode 100644
index 0000000..20fe767
--- /dev/null
+++ b/modules/pub-sub/src/test/java/org/apache/ignite/stream/pubsub/MockPubSubServer.java
@@ -0,0 +1,147 @@
+/*
+ * 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.pubsub;
+
+import com.google.api.core.ApiFutures;
+import com.google.api.gax.core.CredentialsProvider;
+import com.google.api.gax.core.NoCredentialsProvider;
+import com.google.api.gax.grpc.GrpcTransportChannel;
+import com.google.api.gax.rpc.FixedTransportChannelProvider;
+import com.google.cloud.pubsub.v1.Publisher;
+import com.google.cloud.pubsub.v1.stub.SubscriberStubSettings;
+import com.google.pubsub.v1.PubsubMessage;
+import com.google.pubsub.v1.PullRequest;
+import com.google.pubsub.v1.PullResponse;
+import com.google.pubsub.v1.ReceivedMessage;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Queue;
+import java.util.UUID;
+import java.util.concurrent.LinkedBlockingDeque;
+import java.util.logging.Logger;
+
+import org.jetbrains.annotations.NotNull;
+import org.mockito.Mockito;
+
+import io.grpc.CallOptions;
+import io.grpc.ClientCall;
+import io.grpc.ManagedChannel;
+import io.grpc.Metadata;
+import io.grpc.MethodDescriptor;
+import io.grpc.Status;
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.doAnswer;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * Mock Pub/Sub Server
+ */
+class MockPubSubServer {
+
+    /** Test topic. */
+    public static final String TOPIC_NAME = "pagevisits";
+
+    private static final Logger LOGGER = Logger.getLogger(MockPubSubServer.class.getName());
+    public static final String PROJECT = "test-project";
+    private static final String LOCALHOST = "localhost";
+    private static final int PORT = 8080;
+    public static final int MESSAGES_PER_REQUEST = 10;
+
+    private final Map<String, Publisher> publishers = new HashMap<>();
+    private final List<PubsubMessage> topicMessages = new ArrayList<>();
+    private final Queue<PubsubMessage> blockingQueue = new LinkedBlockingDeque<>();
+
+    public SubscriberStubSettings createSubscriberStub() throws IOException {
+        CredentialsProvider credentialsProvider = NoCredentialsProvider.create();
+
+        ManagedChannel managedChannel = managedChannel();
+
+        FixedTransportChannelProvider transportChannel = FixedTransportChannelProvider.create(GrpcTransportChannel.create(managedChannel));
+        SubscriberStubSettings subscriberStubSettings = SubscriberStubSettings.newBuilder()
+                                                                              .setTransportChannelProvider(transportChannel)
+                                                                              .setCredentialsProvider(credentialsProvider)
+                                                                              .build();
+        return subscriberStubSettings;
+    }
+
+    @NotNull
+    private ManagedChannel managedChannel() {
+        ManagedChannel managedChannel = Mockito.mock(ManagedChannel.class);
+        when(managedChannel.newCall(any(MethodDescriptor.class),any(CallOptions.class))).thenAnswer((la) -> clientCall());
+        return managedChannel;
+    }
+
+    private ClientCall<PullRequest, PullResponse> clientCall() {
+        ClientCall<PullRequest, PullResponse> clientCall = Mockito.mock(ClientCall.class);
+
+        doAnswer(
+            iom ->{
+                Object[] arguments = iom.getArguments();
+                ClientCall.Listener<PullResponse> listener = (ClientCall.Listener<PullResponse>) arguments[0];
+                Metadata metadata = (Metadata) arguments[1];
+                pullMessages(listener, metadata);
+                return null;
+            }
+        ).when(clientCall).start(any(ClientCall.Listener.class),any(Metadata.class));
+        return clientCall;
+    }
+
+    private void pullMessages(ClientCall.Listener<PullResponse> listener, Metadata metadata) {
+        PullResponse.Builder pullResponse = PullResponse.newBuilder();
+
+        for(int i = 0; i < MESSAGES_PER_REQUEST; i++) {
+            pullResponse.addReceivedMessages(ReceivedMessage.newBuilder().mergeMessage(blockingQueue.remove()).build());
+        }
+
+        listener.onMessage(pullResponse.build());
+        listener.onClose(Status.OK, metadata);
+    }
+
+    public Publisher getPublisher(String topicName) throws IOException {
+        publishers.putIfAbsent(topicName, createPublisher(topicName));
+        return publishers.get(topicName);
+    }
+
+    private Publisher createPublisher(String topic) {
+        Publisher publisher = mock(Publisher.class);
+
+        when(publisher.publish(any(PubsubMessage.class))).thenAnswer(
+                (iom) -> {
+                    PubsubMessage pubsubMessage = (PubsubMessage) iom.getArguments()[0];
+                    blockingQueue.add(pubsubMessage);
+                    return ApiFutures.immediateFuture(UUID.randomUUID().toString());
+                }
+        );
+        return publisher;
+    }
+
+    /**
+     * Obtains Pub/Sub address.
+     *
+     * @return Pub/Sub address.
+     */
+    private String getPubSubAddress() {
+        return LOCALHOST+ ":" + PORT;
+    }
+
+}
diff --git a/modules/pub-sub/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerSelfTest.java b/modules/pub-sub/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerSelfTest.java
new file mode 100644
index 0000000..1ab67c4
--- /dev/null
+++ b/modules/pub-sub/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerSelfTest.java
@@ -0,0 +1,310 @@
+/*
+ * 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.pubsub;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Logger;
+
+import java.util.concurrent.TimeoutException;
+
+import org.apache.ignite.Ignite;
+import org.apache.ignite.IgniteCache;
+import org.apache.ignite.IgniteDataStreamer;
+import org.apache.ignite.IgniteIllegalStateException;
+import org.apache.ignite.IgniteLogger;
+import org.apache.ignite.Ignition;
+import org.apache.ignite.configuration.CacheConfiguration;
+import org.apache.ignite.events.CacheEvent;
+import org.apache.ignite.internal.IgniteEx;
+import org.apache.ignite.internal.util.lang.GridMapEntry;
+import org.apache.ignite.lang.IgniteBiPredicate;
+import org.apache.ignite.resources.IgniteInstanceResource;
+import org.apache.ignite.resources.LoggerResource;
+import org.apache.ignite.stream.StreamMultipleTupleExtractor;
+import org.apache.ignite.stream.StreamSingleTupleExtractor;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.protobuf.ByteString;
+import com.google.pubsub.v1.ProjectSubscriptionName;
+import com.google.pubsub.v1.ProjectTopicName;
+import com.google.pubsub.v1.PubsubMessage;
+
+import static org.apache.ignite.cache.CacheAtomicityMode.ATOMIC;
+import static org.apache.ignite.cache.CacheAtomicityMode.TRANSACTIONAL;
+import static org.apache.ignite.cache.CacheAtomicityMode.TRANSACTIONAL_SNAPSHOT;
+import static org.apache.ignite.cache.CacheWriteSynchronizationMode.FULL_SYNC;
+import static org.apache.ignite.events.EventType.EVT_CACHE_OBJECT_PUT;
+import static org.apache.ignite.stream.pubsub.MockPubSubServer.PROJECT;
+import static org.apache.ignite.stream.pubsub.MockPubSubServer.TOPIC_NAME;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Tests for {@link PubSubStreamer}.
+ */
+public class PubSubStreamerSelfTest {
+
+    private static final Logger LOGGER = Logger.getLogger(PubSubStreamerSelfTest.class.getName());
+
+    /** Cache name. */
+    private static final String DEFAULT_CACHE_NAME = "testCache";
+
+    /** Ignite test configuration file. */
+    private static final String GRID_CONF_FILE = "config/example-ignite.xml";
+
+    /** Subscription Name. */
+    private static final String SUBSCRIPTION = "ignite_subscription";
+
+    /** Count. */
+    private static final int CNT = 100;
+
+    /** Messages per request. */
+    private static final int MESSAGES_PER_REQUEST = 10;
+
+    /** Topic message key prefix. */
+    private static final String KEY_PREFIX = "192.168.2.";
+
+    /** Topic message value URL. */
+    private static final String VALUE_URL = ",www.example.com,";
+
+
+    private static final String JSON_KEY = "key";
+    private static final String JSON_VALUE = "value";
+
+    private Ignite ignite;
+
+    private static MockPubSubServer mockPubSubServer = new MockPubSubServer();
+
+    @Before
+    public void beforeTest() throws InterruptedException {
+        this.ignite = Ignition.start(GRID_CONF_FILE);
+        IgniteCache<Integer,String> igniteCache = ignite.getOrCreateCache(defaultCacheConfiguration());
+    }
+
+    @After
+    public void afterTest() {
+        ignite.cache(DEFAULT_CACHE_NAME).clear();
+        Ignition.stop(true);
+    }
+
+    /**
+     * @return New cache configuration with modified defaults.
+     */
+    public static CacheConfiguration<Integer,String> defaultCacheConfiguration() {
+        CacheConfiguration cfg = new CacheConfiguration(DEFAULT_CACHE_NAME);
+        cfg.setAtomicityMode(ATOMIC);
+        cfg.setWriteSynchronizationMode(FULL_SYNC);
+        return cfg;
+    }
+    /**
+     * Tests Pub/Sub streamer.
+     *
+     * @throws TimeoutException If timed out.
+     * @throws InterruptedException If interrupted.
+     */
+    @Test
+    public void testPubSubStreamer() throws Exception {
+        Map<String, String> keyValMap = produceStream();
+        consumerStream(ProjectTopicName.of(MockPubSubServer.PROJECT, MockPubSubServer.TOPIC_NAME), keyValMap);
+    }
+
+    /**
+     * Consumes Pub/Sub stream via Ignite.
+     *
+     * @param topic Topic name.
+     * @param keyValMap Expected key value map.
+     * @throws TimeoutException If timed out.
+     * @throws InterruptedException If interrupted.
+     */
+    private void consumerStream(ProjectTopicName topic, Map<String, String> keyValMap)
+            throws InterruptedException, IOException {
+        PubSubStreamer<String, String> pubSubStmr = null;
+
+        try (IgniteDataStreamer<String, String> stmr = ignite.dataStreamer(DEFAULT_CACHE_NAME)) {
+            stmr.allowOverwrite(true);
+            stmr.autoFlushFrequency(MESSAGES_PER_REQUEST);
+
+            // Configure Pub/Sub streamer.
+            pubSubStmr = new PubSubStreamer<>();
+
+            // Get the cache.
+            IgniteCache<String, String> cache = ignite.cache(DEFAULT_CACHE_NAME);
+
+            // Set Ignite instance.
+            pubSubStmr.setIgnite(ignite);
+
+            // Set data streamer instance.
+            pubSubStmr.setStreamer(stmr);
+
+            // Set the topic.
+            pubSubStmr.setTopic(Arrays.asList(topic));
+
+            // Set subscription name
+            pubSubStmr.setSubscriptionName(ProjectSubscriptionName.format(PROJECT, SUBSCRIPTION));
+
+            // Set the number of threads.
+            pubSubStmr.setThreads(4);
+
+            // Set the SubScriber Stub settings.
+            pubSubStmr.setSubscriberStubSettings(mockPubSubServer.createSubscriberStub());
+
+            pubSubStmr.setSingleTupleExtractor(singleTupleExtractor());
+
+            // Start Pub/Sub streamer.
+            pubSubStmr.start();
+
+            final CountDownLatch latch = new CountDownLatch(CNT);
+
+            IgniteBiPredicate<UUID, CacheEvent> locLsnr = new IgniteBiPredicate<UUID, CacheEvent>() {
+                @IgniteInstanceResource
+                private Ignite ig;
+
+                @LoggerResource
+                private IgniteLogger log;
+
+                /** {@inheritDoc} */
+                @Override public boolean apply(UUID uuid, CacheEvent evt) {
+                    latch.countDown();
+
+                    if (log.isInfoEnabled()) {
+                        IgniteEx igEx = (IgniteEx)ig;
+
+                        UUID nodeId = igEx.localNode().id();
+
+                        log.info("Receive event=" + evt + ", nodeId=" + nodeId);
+                    }
+
+                    return true;
+                }
+            };
+
+            ignite.events(ignite.cluster().forCacheNodes(DEFAULT_CACHE_NAME)).remoteListen(locLsnr, null, EVT_CACHE_OBJECT_PUT);
+
+            // Checks all events successfully processed in 10 seconds.
+            assertTrue("Failed to wait latch completion, still wait " + latch.getCount() + " events",
+                latch.await(10, TimeUnit.SECONDS));
+
+            for (Map.Entry<String, String> entry : keyValMap.entrySet())
+                assertEquals(entry.getValue(), cache.get(entry.getKey()));
+        }
+        finally {
+            if (pubSubStmr!= null)
+                pubSubStmr.stop();
+        }
+    }
+
+    /**
+     * Sends messages to Pub/Sub.
+     *
+     * @return Map of key value messages.
+     */
+    private Map<String, String> produceStream() throws Exception {
+        List<Integer> subnet = new ArrayList<>();
+
+        for (int i = 1; i <= CNT; i++)
+            subnet.add(i);
+
+        Collections.shuffle(subnet);
+
+        List<PubsubMessage> messages = new ArrayList<>();
+
+        Map<String, String> keyValMap = new HashMap<>();
+
+        for (int evt = 0; evt < CNT; evt++) {
+            long runtime = System.currentTimeMillis();
+
+            String ip = KEY_PREFIX + subnet.get(evt);
+
+            String msg = runtime + VALUE_URL + ip;
+
+            JsonObject jsonObject = new JsonObject();
+            jsonObject.addProperty(JSON_KEY, ip);
+            jsonObject.addProperty(JSON_VALUE, msg);
+
+            ByteString byteString = ByteString.copyFrom(jsonObject.toString(), Charset.defaultCharset());
+
+            PubsubMessage pubsubMessage = PubsubMessage.newBuilder()
+                                                       .setData(byteString)
+                                                       .build();
+
+            messages.add(pubsubMessage);
+            String messageId = mockPubSubServer.getPublisher(TOPIC_NAME).publish(pubsubMessage).get();
+            keyValMap.put(ip, msg);
+
+        }
+
+        return keyValMap;
+    }
+
+    /**
+     * @return {@link StreamSingleTupleExtractor} for testing.
+     */
+    private static StreamSingleTupleExtractor<PubsubMessage, String, String> singleTupleExtractor() {
+        return new StreamSingleTupleExtractor<PubsubMessage, String, String>() {
+            @Override public Map.Entry<String, String> extract(PubsubMessage msg) {
+                String dataStr = msg.getData().toStringUtf8();
+                JsonElement jsonElement = new JsonParser().parse(dataStr).getAsJsonObject();
+                JsonObject jsonObject = jsonElement.getAsJsonObject();
+                return new GridMapEntry<>(jsonObject.get(JSON_KEY).getAsString(), jsonObject.get(JSON_VALUE).getAsString());
+            }
+        };
+    }
+
+    /**
+     * @return {@link StreamMultipleTupleExtractor} for testing.
+     */
+    private static StreamMultipleTupleExtractor<PubsubMessage, String, String> multipleTupleExtractor() {
+        return new StreamMultipleTupleExtractor<PubsubMessage, String, String>() {
+            @Override public Map<String, String> extract(PubsubMessage msg) {
+                String dataStr = msg.getData().toStringUtf8();
+                JsonElement jsonElement = new JsonParser().parse(dataStr).getAsJsonObject();
+                JsonArray jsonArray = jsonElement.getAsJsonArray();
+
+                final Map<String, String> answer = new HashMap<>();
+
+                for(int i=0;i<jsonArray.size();i++) {
+                    JsonObject jsonObject = jsonArray.get(i) .getAsJsonObject();
+                    String key = jsonObject.get(JSON_KEY).getAsString();
+                    String value = jsonObject.get(JSON_VALUE).getAsString();
+
+                    answer.put(key,value);
+                }
+
+                return answer;
+            }
+        };
+    }
+
+}
diff --git a/modules/pub-sub/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerTestSuite.java b/modules/pub-sub/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerTestSuite.java
new file mode 100644
index 0000000..fd51b01
--- /dev/null
+++ b/modules/pub-sub/src/test/java/org/apache/ignite/stream/pubsub/PubSubStreamerTestSuite.java
@@ -0,0 +1,29 @@
+/*
+ * 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.pubsub;
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Suite;
+
+/**
+ * Pub/Sub streamer tests.
+ */
+@RunWith(Suite.class)
+@Suite.SuiteClasses({PubSubStreamerSelfTest.class})
+public class PubSubStreamerTestSuite {
+}
diff --git a/modules/pub-sub/src/test/resources/example-ignite.xml b/modules/pub-sub/src/test/resources/example-ignite.xml
new file mode 100644
index 0000000..f23a306
--- /dev/null
+++ b/modules/pub-sub/src/test/resources/example-ignite.xml
@@ -0,0 +1,73 @@
+<?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.
+-->
+
+<!--
+    Ignite configuration with all defaults and enabled p2p deployment and enabled events.
+    Used for testing IgniteSink running Ignite in a client mode.
+-->
+<beans xmlns="http://www.springframework.org/schema/beans"
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns:util="http://www.springframework.org/schema/util"
+       xsi:schemaLocation="
+        http://www.springframework.org/schema/beans
+        http://www.springframework.org/schema/beans/spring-beans.xsd
+        http://www.springframework.org/schema/util
+        http://www.springframework.org/schema/util/spring-util.xsd">
+    <bean id="ignite.cfg" class="org.apache.ignite.configuration.IgniteConfiguration">
+        <!-- Enable peer class loading for remote events. -->
+        <property name="peerClassLoadingEnabled" value="true"/>
+        <!-- Enable client mode. -->
+        <property name="clientMode" value="true"/>
+
+        <!-- Cache accessed from IgniteSink. -->
+        <property name="cacheConfiguration">
+            <list>
+                <!-- Partitioned cache example configuration with configurations adjusted to server nodes'. -->
+                <bean class="org.apache.ignite.configuration.CacheConfiguration">
+                    <property name="atomicityMode" value="ATOMIC"/>
+
+                    <property name="name" value="testCache"/>
+                </bean>
+            </list>
+        </property>
+
+        <!-- Enable cache events. -->
+        <property name="includeEventTypes">
+            <list>
+                <!-- Cache events. -->
+                <util:constant static-field="org.apache.ignite.events.EventType.EVT_CACHE_OBJECT_PUT"/>
+            </list>
+        </property>
+
+        <!-- Explicitly configure TCP discovery SPI to provide list of initial nodes. -->
+        <property name="discoverySpi">
+            <bean class="org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi">
+                <property name="ipFinder">
+                    <bean class="org.apache.ignite.spi.discovery.tcp.ipfinder.vm.TcpDiscoveryVmIpFinder">
+                        <property name="addresses">
+                            <list>
+                                <value>127.0.0.1:47500</value>
+                            </list>
+                        </property>
+                    </bean>
+                </property>
+            </bean>
+        </property>
+    </bean>
+</beans>
diff --git a/parent/pom.xml b/parent/pom.xml
index fde57a5..077161c 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -517,6 +517,10 @@
                                 <packages>org.apache.ignite.stream.rocketmq*</packages>
                             </group>
                             <group>
+                                <title>Pub/Sub integration</title>
+                                <packages>org.apache.ignite.stream.pubsub.*</packages>
+                            </group>
+                            <group>
                                 <title>Storm integration</title>
                                 <packages>org.apache.ignite.stream.storm*</packages>
                             </group>
diff --git a/pom.xml b/pom.xml
index e5fb47f..bd0c46e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -43,6 +43,7 @@
 
     <modules>
         <module>modules/flink-ext</module>
+        <module>modules/pub-sub</module>
     </modules>
 
     <profiles>