Sending Data Updated Event to kafka

Issue-ID: CPS-374
Signed-off-by: Renu Kumari <renu.kumari@bell.ca>
Change-Id: I05fedcace42b84575411df26c586788bffe6b846

22 files changed, 916 insertions, 10 deletions

diff --git a/cps-application/src/main/resources/application.yml b/cps-application/src/main/resources/application.yml
index 3edb20cd1..4f3072eb9 100644
--- a/cps-application/src/main/resources/application.yml
+++ b/cps-application/src/main/resources/application.yml
@@ -1,5 +1,6 @@
 #  ============LICENSE_START=======================================================

 #  Modification (C) 2021 Nordix Foundation

+#  Modification Copyright (C) 2021 Bell Canada.

 #  ================================================================================

 #  Licensed under the Apache License, Version 2.0 (the "License");

 #  you may not use this file except in compliance with the License.

@@ -57,6 +58,19 @@ spring:
             max-file-size: 100MB

             max-request-size: 100MB

 

+    kafka:

+        bootstrap-servers: ${KAFKA_BOOTSTRAP_SERVER:localhost:9092}

+        security:

+            protocol: PLAINTEXT

+        producer:

+            value-serializer: org.springframework.kafka.support.serializer.JsonSerializer

+            client-id: cps-core

+

+notification:

+    data-updated:

+        enabled: false

+        topic: ${CPS_CHANGE_EVENT_TOPIC:cps.cfg-state-events}

+

 security:

     # comma-separated uri patterns which do not require authorization

     permit-uri: /manage/health/**,/manage/info,/swagger-ui/**,/swagger-resources/**,/v3/api-docs

diff --git a/cps-bom/pom.xml b/cps-bom/pom.xml
index 12961b8fd..f947eaecf 100644
--- a/cps-bom/pom.xml
+++ b/cps-bom/pom.xml
@@ -2,6 +2,7 @@
 <!--
   ============LICENSE_START=======================================================
   Modification Copyright (C) 2021 Nordix Foundation
+  Modification Copyright (C) 2021 Bell Canada.
   ================================================================================
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
@@ -82,6 +83,11 @@
             </dependency>
             <dependency>
                 <groupId>${project.groupId}</groupId>
+                <artifactId>cps-events</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>${project.groupId}</groupId>
                 <artifactId>checkstyle</artifactId>
                 <version>${project.version}</version>
             </dependency>
diff --git a/cps-dependencies/pom.xml b/cps-dependencies/pom.xml
index afe4de059..bd55113de 100755
--- a/cps-dependencies/pom.xml
+++ b/cps-dependencies/pom.xml
@@ -152,6 +152,11 @@
             </dependency>
             <dependency>
                 <groupId>org.testcontainers</groupId>
+                <artifactId>kafka</artifactId>
+                <version>${testcontainers.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>org.testcontainers</groupId>
                 <artifactId>postgresql</artifactId>
                 <version>${testcontainers.version}</version>
             </dependency>
diff --git a/cps-parent/pom.xml b/cps-parent/pom.xml
index a341ea9af..bd857720c 100755
--- a/cps-parent/pom.xml
+++ b/cps-parent/pom.xml
@@ -327,7 +327,7 @@
                             see https://www.testcontainers.org/features/configuration/#disabling-ryuk
                          -->
                         <TESTCONTAINERS_RYUK_DISABLED>true</TESTCONTAINERS_RYUK_DISABLED>
-                        <TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>${docker.pull.registry}/library/</TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>
+                        <TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>${docker.pull.registry}/</TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>
                     </environmentVariables>
                 </configuration>
             </plugin>
diff --git a/cps-ri/pom.xml b/cps-ri/pom.xml
index 320c7edae..b2cf6917e 100644
--- a/cps-ri/pom.xml
+++ b/cps-ri/pom.xml
@@ -2,6 +2,7 @@
 <!--

   ============LICENSE_START=======================================================

   Modification Copyright (C) 2021 Nordix Foundation

+  Modifications Copyright (C) 2021 Bell Canada.

   ================================================================================

   Licensed under the Apache License, Version 2.0 (the "License");

   you may not use this file except in compliance with the License.

@@ -116,4 +117,18 @@
             <scope>test</scope>

         </dependency>

     </dependencies>

+

+    <build>

+        <plugins>

+            <plugin>

+                <groupId>org.apache.maven.plugins</groupId>

+                <artifactId>maven-surefire-plugin</artifactId>

+                <configuration>

+                    <environmentVariables>

+                        <TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>${docker.pull.registry}/library/</TESTCONTAINERS_HUB_IMAGE_NAME_PREFIX>

+                    </environmentVariables>

+                </configuration>

+            </plugin>

+        </plugins>

+    </build>

 </project>

diff --git a/cps-service/pom.xml b/cps-service/pom.xml
index 878c4434d..dcfb1a70f 100644
--- a/cps-service/pom.xml
+++ b/cps-service/pom.xml
@@ -2,6 +2,7 @@
 <!--

   ============LICENSE_START=======================================================

   Copyright Copyright (C) 2021 Nordix Foundation

+  Modifications Copyright (C) 2021 Bell Canada.

   ================================================================================

   Licensed under the Apache License, Version 2.0 (the "License");

   you may not use this file except in compliance with the License.

@@ -32,6 +33,10 @@
 

   <dependencies>

     <dependency>

+      <groupId>org.onap.cps</groupId>

+      <artifactId>cps-events</artifactId>

+    </dependency>

+    <dependency>

       <groupId>org.opendaylight.yangtools</groupId>

       <artifactId>yang-model-api</artifactId>

     </dependency>

@@ -65,6 +70,14 @@
       <artifactId>caffeine</artifactId>

     </dependency>

     <dependency>

+      <groupId>org.springframework.kafka</groupId>

+      <artifactId>spring-kafka</artifactId>

+    </dependency>

+    <dependency>

+      <groupId>org.springframework</groupId>

+      <artifactId>spring-messaging</artifactId>

+    </dependency>

+    <dependency>

       <!-- For logging -->

       <groupId>org.slf4j</groupId>

       <artifactId>slf4j-api</artifactId>

@@ -105,5 +118,15 @@
       <artifactId>cglib-nodep</artifactId>

       <scope>test</scope>

     </dependency>

+    <dependency>

+      <groupId>org.testcontainers</groupId>

+      <artifactId>kafka</artifactId>

+      <scope>test</scope>

+    </dependency>

+    <dependency>

+      <groupId>org.springframework.kafka</groupId>

+      <artifactId>spring-kafka-test</artifactId>

+      <scope>test</scope>

+    </dependency>

   </dependencies>

 </project>

diff --git a/cps-service/src/main/java/org/onap/cps/api/impl/CpsDataServiceImpl.java b/cps-service/src/main/java/org/onap/cps/api/impl/CpsDataServiceImpl.java
index 23bf4f2ee..c822c68ae 100755
--- a/cps-service/src/main/java/org/onap/cps/api/impl/CpsDataServiceImpl.java
+++ b/cps-service/src/main/java/org/onap/cps/api/impl/CpsDataServiceImpl.java
@@ -3,6 +3,7 @@
  *  Copyright (C) 2021 Nordix Foundation
  *  Modifications Copyright (C) 2020 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 Pantheon.tech
+ *  Modifications Copyright (C) 2021 Bell Canada.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -25,6 +26,7 @@ import java.util.Collection;
 import org.onap.cps.api.CpsAdminService;
 import org.onap.cps.api.CpsDataService;
 import org.onap.cps.api.CpsModuleService;
+import org.onap.cps.notification.NotificationService;
 import org.onap.cps.spi.CpsDataPersistenceService;
 import org.onap.cps.spi.FetchDescendantsOption;
 import org.onap.cps.spi.exceptions.DataValidationException;
@@ -53,10 +55,14 @@ public class CpsDataServiceImpl implements CpsDataService {
     @Autowired
     private YangTextSchemaSourceSetCache yangTextSchemaSourceSetCache;
 
+    @Autowired
+    private NotificationService notificationService;
+
     @Override
     public void saveData(final String dataspaceName, final String anchorName, final String jsonData) {
         final var dataNode = buildDataNodeFromJson(dataspaceName, anchorName, ROOT_NODE_XPATH, jsonData);
         cpsDataPersistenceService.storeDataNode(dataspaceName, anchorName, dataNode);
+        notificationService.processDataUpdatedEvent(dataspaceName, anchorName);
     }
 
     @Override
@@ -64,6 +70,7 @@ public class CpsDataServiceImpl implements CpsDataService {
         final String jsonData) {
         final var dataNode = buildDataNodeFromJson(dataspaceName, anchorName, parentNodeXpath, jsonData);
         cpsDataPersistenceService.addChildDataNode(dataspaceName, anchorName, parentNodeXpath, dataNode);
+        notificationService.processDataUpdatedEvent(dataspaceName, anchorName);
     }
 
     @Override
@@ -72,6 +79,7 @@ public class CpsDataServiceImpl implements CpsDataService {
         final Collection<DataNode> dataNodesCollection =
             buildDataNodeCollectionFromJson(dataspaceName, anchorName, parentNodeXpath, jsonData);
         cpsDataPersistenceService.addListDataNodes(dataspaceName, anchorName, parentNodeXpath, dataNodesCollection);
+        notificationService.processDataUpdatedEvent(dataspaceName, anchorName);
     }
 
     @Override
@@ -86,6 +94,7 @@ public class CpsDataServiceImpl implements CpsDataService {
         final var dataNode = buildDataNodeFromJson(dataspaceName, anchorName, parentNodeXpath, jsonData);
         cpsDataPersistenceService
             .updateDataLeaves(dataspaceName, anchorName, dataNode.getXpath(), dataNode.getLeaves());
+        notificationService.processDataUpdatedEvent(dataspaceName, anchorName);
     }
 
     @Override
@@ -93,6 +102,7 @@ public class CpsDataServiceImpl implements CpsDataService {
         final String jsonData) {
         final var dataNode = buildDataNodeFromJson(dataspaceName, anchorName, parentNodeXpath, jsonData);
         cpsDataPersistenceService.replaceDataNodeTree(dataspaceName, anchorName, dataNode);
+        notificationService.processDataUpdatedEvent(dataspaceName, anchorName);
     }
 
     @Override
@@ -101,6 +111,7 @@ public class CpsDataServiceImpl implements CpsDataService {
         final Collection<DataNode> dataNodes =
             buildDataNodeCollectionFromJson(dataspaceName, anchorName, parentNodeXpath, jsonData);
         cpsDataPersistenceService.replaceListDataNodes(dataspaceName, anchorName, parentNodeXpath, dataNodes);
+        notificationService.processDataUpdatedEvent(dataspaceName, anchorName);
     }
 
     private DataNode buildDataNodeFromJson(final String dataspaceName, final String anchorName,
diff --git a/cps-service/src/main/java/org/onap/cps/notification/CpsDataUpdatedEventFactory.java b/cps-service/src/main/java/org/onap/cps/notification/CpsDataUpdatedEventFactory.java
new file mode 100644
index 000000000..ae5e9ba29
--- /dev/null
+++ b/cps-service/src/main/java/org/onap/cps/notification/CpsDataUpdatedEventFactory.java
@@ -0,0 +1,96 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.time.OffsetDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.UUID;
+import org.onap.cps.api.CpsAdminService;
+import org.onap.cps.api.CpsDataService;
+import org.onap.cps.event.model.Content;
+import org.onap.cps.event.model.CpsDataUpdatedEvent;
+import org.onap.cps.event.model.CpsDataUpdatedEvent.Schema;
+import org.onap.cps.event.model.Data;
+import org.onap.cps.spi.FetchDescendantsOption;
+import org.onap.cps.spi.model.Anchor;
+import org.onap.cps.spi.model.DataNode;
+import org.onap.cps.utils.DataMapUtils;
+import org.springframework.stereotype.Component;
+
+@Component
+class CpsDataUpdatedEventFactory {
+
+    private static final URI EVENT_SOURCE;
+    private static final String EVENT_TYPE = "org.onap.cps.data-updated-event";
+    private static final DateTimeFormatter dateTimeFormatter =
+        DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
+
+    static  {
+        try {
+            EVENT_SOURCE = new URI("urn:cps:org.onap.cps");
+        } catch (final URISyntaxException e) {
+            // As it is fixed string, I don't expect to see this error
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    private CpsDataService cpsDataService;
+    private CpsAdminService cpsAdminService;
+
+    public CpsDataUpdatedEventFactory(final CpsDataService cpsDataService, final CpsAdminService cpsAdminService) {
+        this.cpsDataService = cpsDataService;
+        this.cpsAdminService = cpsAdminService;
+    }
+
+    CpsDataUpdatedEvent createCpsDataUpdatedEvent(final String dataspaceName, final String anchorName) {
+        final var dataNode = cpsDataService
+            .getDataNode(dataspaceName, anchorName, "/", FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS);
+        final var anchor = cpsAdminService.getAnchor(dataspaceName, anchorName);
+        return toCpsDataUpdatedEvent(anchor, dataNode);
+    }
+
+    private CpsDataUpdatedEvent toCpsDataUpdatedEvent(final Anchor anchor, final DataNode dataNode) {
+        final var cpsDataUpdatedEvent = new CpsDataUpdatedEvent();
+        cpsDataUpdatedEvent.withContent(createContent(anchor, dataNode));
+        cpsDataUpdatedEvent.withId(UUID.randomUUID().toString());
+        cpsDataUpdatedEvent.withSchema(Schema.URN_CPS_ORG_ONAP_CPS_DATA_UPDATED_EVENT_SCHEMA_1_1_0_SNAPSHOT);
+        cpsDataUpdatedEvent.withSource(EVENT_SOURCE);
+        cpsDataUpdatedEvent.withType(EVENT_TYPE);
+        return cpsDataUpdatedEvent;
+    }
+
+    private Data createData(final DataNode dataNode) {
+        final var data = new Data();
+        DataMapUtils.toDataMap(dataNode).forEach((key, value) -> data.setAdditionalProperty(key, value));
+        return data;
+    }
+
+    private Content createContent(final Anchor anchor, final DataNode dataNode) {
+        final var content = new Content();
+        content.withAnchorName(anchor.getName());
+        content.withDataspaceName(anchor.getDataspaceName());
+        content.withSchemaSetName(anchor.getSchemaSetName());
+        content.withData(createData(dataNode));
+        content.withObservedTimestamp(dateTimeFormatter.format(OffsetDateTime.now()));
+        return content;
+    }
+}
diff --git a/cps-service/src/main/java/org/onap/cps/notification/KafkaProducerListener.java b/cps-service/src/main/java/org/onap/cps/notification/KafkaProducerListener.java
new file mode 100644
index 000000000..f4b68c069
--- /dev/null
+++ b/cps-service/src/main/java/org/onap/cps/notification/KafkaProducerListener.java
@@ -0,0 +1,52 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.kafka.clients.producer.ProducerRecord;
+import org.apache.kafka.clients.producer.RecordMetadata;
+import org.springframework.kafka.support.ProducerListener;
+import org.springframework.stereotype.Component;
+
+@Slf4j
+@Component
+public class KafkaProducerListener<K, V> implements ProducerListener<K, V> {
+
+    private NotificationErrorHandler notificationErrorHandler;
+
+    public KafkaProducerListener(final NotificationErrorHandler notificationErrorHandler) {
+        this.notificationErrorHandler = notificationErrorHandler;
+    }
+
+    @Override
+    public void onSuccess(final ProducerRecord<K, V> producerRecord, final RecordMetadata recordMetadata) {
+        log.debug("Message sent to event-bus topic :'{}' with body : {} ", producerRecord.topic(),
+            producerRecord.value());
+    }
+
+    @Override
+    public void onError(final ProducerRecord<K, V> producerRecord,
+            final RecordMetadata recordMetadata,
+            final Exception exception) {
+        notificationErrorHandler.onException("Failed to send message to message bus",
+            exception, producerRecord, recordMetadata);
+    }
+
+}
diff --git a/cps-service/src/main/java/org/onap/cps/notification/NotificationErrorHandler.java b/cps-service/src/main/java/org/onap/cps/notification/NotificationErrorHandler.java
new file mode 100644
index 000000000..eef028d5f
--- /dev/null
+++ b/cps-service/src/main/java/org/onap/cps/notification/NotificationErrorHandler.java
@@ -0,0 +1,40 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.stereotype.Component;
+
+@Component
+@Slf4j
+public class NotificationErrorHandler {
+
+    void onException(final Exception exception, final Object... context) {
+        onException("Failed to process", exception, context);
+    }
+
+    void onException(final String message, final Exception exception, final Object... context) {
+        log.error("{} \n Error cause: {} \n Error context: {}",
+            message,
+            exception.getCause() != null ? exception.getCause().toString() : exception.getMessage(),
+            context,
+            exception);
+    }
+}
diff --git a/cps-service/src/main/java/org/onap/cps/notification/NotificationPublisher.java b/cps-service/src/main/java/org/onap/cps/notification/NotificationPublisher.java
new file mode 100644
index 000000000..1ab032b57
--- /dev/null
+++ b/cps-service/src/main/java/org/onap/cps/notification/NotificationPublisher.java
@@ -0,0 +1,65 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification;
+
+import lombok.extern.slf4j.Slf4j;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.onap.cps.event.model.CpsDataUpdatedEvent;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.kafka.core.KafkaTemplate;
+import org.springframework.stereotype.Component;
+
+@Component
+@Slf4j
+public class NotificationPublisher {
+
+    private KafkaTemplate<String, CpsDataUpdatedEvent> kafkaTemplate;
+    private String topicName;
+
+    /**
+     * Create an instance of Notification Publisher.
+     *
+     * @param kafkaTemplate kafkaTemplate is send event using kafka
+     * @param topicName     topic, to which cpsDataUpdatedEvent is sent, is provided by setting
+     *                      'notification.data-updated.topic' in the application properties
+     */
+    @Autowired
+    public NotificationPublisher(
+        final KafkaTemplate<String, CpsDataUpdatedEvent> kafkaTemplate,
+        final @Value("${notification.data-updated.topic}") String topicName) {
+        this.kafkaTemplate = kafkaTemplate;
+        this.topicName = topicName;
+    }
+
+    /**
+     * Send event to Kafka with correct message key.
+     *
+     * @param cpsDataUpdatedEvent event to be sent to kafka
+     */
+    void sendNotification(@NonNull final CpsDataUpdatedEvent cpsDataUpdatedEvent) {
+        final var messageKey = cpsDataUpdatedEvent.getContent().getDataspaceName() + ","
+            + cpsDataUpdatedEvent.getContent().getAnchorName();
+        log.debug("Data Updated event is being sent with messageKey: '{}' & body : {} ",
+            messageKey, cpsDataUpdatedEvent);
+        kafkaTemplate.send(topicName, messageKey, cpsDataUpdatedEvent);
+    }
+
+}
diff --git a/cps-service/src/main/java/org/onap/cps/notification/NotificationService.java b/cps-service/src/main/java/org/onap/cps/notification/NotificationService.java
new file mode 100644
index 000000000..e97e8a3d8
--- /dev/null
+++ b/cps-service/src/main/java/org/onap/cps/notification/NotificationService.java
@@ -0,0 +1,89 @@
+
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Service;
+
+@Service
+@Slf4j
+public class NotificationService {
+
+    private boolean dataUpdatedEventNotificationEnabled;
+    private NotificationPublisher notificationPublisher;
+    private CpsDataUpdatedEventFactory cpsDataUpdatedEventFactory;
+    private NotificationErrorHandler notificationErrorHandler;
+
+    /**
+     * Create an instance of Notification Subscriber.
+     *
+     * @param dataUpdatedEventNotificationEnabled   notification can be enabled by setting
+     *                                              'notification.data-updated.enabled=true' in application properties
+     * @param notificationPublisher                 notification Publisher
+     * @param cpsDataUpdatedEventFactory            to create CPSDataUpdatedEvent
+     * @param notificationErrorHandler              error handler
+     */
+    @Autowired
+    public NotificationService(
+        @Value("${notification.data-updated.enabled}") final boolean dataUpdatedEventNotificationEnabled,
+        final NotificationPublisher notificationPublisher,
+        final CpsDataUpdatedEventFactory cpsDataUpdatedEventFactory,
+        final NotificationErrorHandler notificationErrorHandler) {
+        this.dataUpdatedEventNotificationEnabled = dataUpdatedEventNotificationEnabled;
+        this.notificationPublisher = notificationPublisher;
+        this.cpsDataUpdatedEventFactory = cpsDataUpdatedEventFactory;
+        this.notificationErrorHandler = notificationErrorHandler;
+    }
+
+    /**
+     * Process Data Updated Event and publishes the notification.
+     *
+     * @param dataspaceName dataspace name
+     * @param anchorName    anchor name
+     */
+    public void processDataUpdatedEvent(final String dataspaceName, final String anchorName) {
+        log.debug("process data updated event for dataspace '{}' & anchor '{}'", dataspaceName, anchorName);
+        try {
+            if (shouldSendNotification()) {
+                final var cpsDataUpdatedEvent =
+                    cpsDataUpdatedEventFactory.createCpsDataUpdatedEvent(dataspaceName, anchorName);
+                log.debug("data updated event to be published {}", cpsDataUpdatedEvent);
+                notificationPublisher.sendNotification(cpsDataUpdatedEvent);
+            }
+        } catch (final Exception exception) {
+            /* All the exceptions are handled to not to propagate it to caller.
+               CPS operation should not fail if sending event fails for any reason.
+             */
+            notificationErrorHandler.onException("Failed to process cps-data-updated-event.",
+                exception, dataspaceName, anchorName);
+        }
+    }
+
+    /*
+        Add more complex rules based on dataspace and anchor later
+     */
+    private boolean shouldSendNotification() {
+        return dataUpdatedEventNotificationEnabled;
+    }
+
+}
diff --git a/cps-service/src/test/groovy/org/onap/cps/api/impl/CpsDataServiceImplSpec.groovy b/cps-service/src/test/groovy/org/onap/cps/api/impl/CpsDataServiceImplSpec.groovy
index 8001d6a9f..bf94401c0 100644
--- a/cps-service/src/test/groovy/org/onap/cps/api/impl/CpsDataServiceImplSpec.groovy
+++ b/cps-service/src/test/groovy/org/onap/cps/api/impl/CpsDataServiceImplSpec.groovy
@@ -2,6 +2,7 @@
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2021 Nordix Foundation
  *  Modifications Copyright (C) 2021 Pantheon.tech
+ *  Modifications Copyright (C) 2021 Bell Canada.
  *  ================================================================================
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
@@ -23,6 +24,7 @@ package org.onap.cps.api.impl
 import org.onap.cps.TestUtils
 import org.onap.cps.api.CpsAdminService
 import org.onap.cps.api.CpsModuleService
+import org.onap.cps.notification.NotificationService
 import org.onap.cps.spi.CpsDataPersistenceService
 import org.onap.cps.spi.FetchDescendantsOption
 import org.onap.cps.spi.exceptions.DataValidationException
@@ -37,6 +39,7 @@ class CpsDataServiceImplSpec extends Specification {
     def mockCpsAdminService = Mock(CpsAdminService)
     def mockCpsModuleService = Mock(CpsModuleService)
     def mockYangTextSchemaSourceSetCache = Mock(YangTextSchemaSourceSetCache)
+    def mockNotificationService = Mock(NotificationService)
 
     def objectUnderTest = new CpsDataServiceImpl()
 
@@ -45,6 +48,7 @@ class CpsDataServiceImplSpec extends Specification {
         objectUnderTest.cpsAdminService = mockCpsAdminService
         objectUnderTest.cpsModuleService = mockCpsModuleService
         objectUnderTest.yangTextSchemaSourceSetCache = mockYangTextSchemaSourceSetCache
+        objectUnderTest.notificationService = mockNotificationService
     }
 
     def dataspaceName = 'some dataspace'
@@ -60,6 +64,8 @@ class CpsDataServiceImplSpec extends Specification {
         then: 'the persistence service method is invoked with correct parameters'
             1 * mockCpsDataPersistenceService.storeDataNode(dataspaceName, anchorName,
                     { dataNode -> dataNode.xpath == '/test-tree' })
+        and: 'data updated event is sent to notification service'
+            1 * mockNotificationService.processDataUpdatedEvent(dataspaceName, anchorName)
     }
 
     def 'Saving child data fragment under existing node.'() {
@@ -71,6 +77,8 @@ class CpsDataServiceImplSpec extends Specification {
         then: 'the persistence service method is invoked with correct parameters'
             1 * mockCpsDataPersistenceService.addChildDataNode(dataspaceName, anchorName, '/test-tree',
                     { dataNode -> dataNode.xpath == '/test-tree/branch[@name=\'New\']' })
+        and: 'data updated event is sent to notification service'
+            1 * mockNotificationService.processDataUpdatedEvent(dataspaceName, anchorName)
     }
 
     def 'Saving list-node data fragment under existing node.'() {
@@ -89,6 +97,8 @@ class CpsDataServiceImplSpec extends Specification {
                         }
                     }
             )
+        and: 'data updated event is sent to notification service'
+            1 * mockNotificationService.processDataUpdatedEvent(dataspaceName, anchorName)
     }
 
     def 'Saving empty list-node data fragment.'() {
@@ -119,6 +129,8 @@ class CpsDataServiceImplSpec extends Specification {
             objectUnderTest.updateNodeLeaves(dataspaceName, anchorName, parentNodeXpath, jsonData)
         then: 'the persistence service method is invoked with correct parameters'
             1 * mockCpsDataPersistenceService.updateDataLeaves(dataspaceName, anchorName, expectedNodeXpath, leaves)
+        and: 'data updated event is sent to notification service'
+            1 * mockNotificationService.processDataUpdatedEvent(dataspaceName, anchorName)
         where: 'following parameters were used'
             scenario         | parentNodeXpath | jsonData                        || expectedNodeXpath                   | leaves
             'top level node' | '/'             | '{"test-tree": {"branch": []}}' || '/test-tree'                        | Collections.emptyMap()
@@ -146,6 +158,8 @@ class CpsDataServiceImplSpec extends Specification {
         then: 'the persistence service method is invoked with correct parameters'
             1 * mockCpsDataPersistenceService.replaceDataNodeTree(dataspaceName, anchorName,
                     { dataNode -> dataNode.xpath == expectedNodeXpath })
+        and: 'data updated event is sent to notification service'
+            1 * mockNotificationService.processDataUpdatedEvent(dataspaceName, anchorName)
         where: 'following parameters were used'
             scenario         | parentNodeXpath | jsonData                        || expectedNodeXpath
             'top level node' | '/'             | '{"test-tree": {"branch": []}}' || '/test-tree'
@@ -168,6 +182,8 @@ class CpsDataServiceImplSpec extends Specification {
                         }
                     }
             )
+        and: 'data updated event is sent to notification service'
+            1 * mockNotificationService.processDataUpdatedEvent(dataspaceName, anchorName)
     }
 
     def 'Replace with empty list-node data fragment.'() {
diff --git a/cps-service/src/test/groovy/org/onap/cps/api/impl/E2ENetworkSliceSpec.groovy b/cps-service/src/test/groovy/org/onap/cps/api/impl/E2ENetworkSliceSpec.groovy
index aa54a9991..b5ad42df0 100755
--- a/cps-service/src/test/groovy/org/onap/cps/api/impl/E2ENetworkSliceSpec.groovy
+++ b/cps-service/src/test/groovy/org/onap/cps/api/impl/E2ENetworkSliceSpec.groovy
@@ -23,6 +23,7 @@ package org.onap.cps.api.impl
 

 import org.onap.cps.TestUtils

 import org.onap.cps.api.CpsAdminService

+import org.onap.cps.notification.NotificationService

 import org.onap.cps.spi.CpsDataPersistenceService

 import org.onap.cps.spi.CpsModulePersistenceService

 import org.onap.cps.spi.model.Anchor

@@ -34,8 +35,9 @@ class E2ENetworkSliceSpec extends Specification {
     def mockModuleStoreService = Mock(CpsModulePersistenceService)

     def mockDataStoreService = Mock(CpsDataPersistenceService)

     def mockCpsAdminService = Mock(CpsAdminService)

+    def mockNotificationService = Mock(NotificationService)

     def cpsModuleServiceImpl = new CpsModuleServiceImpl()

-    def cpsDataServiceImple = new CpsDataServiceImpl()

+    def cpsDataServiceImpl = new CpsDataServiceImpl()

     def mockYangTextSchemaSourceSetCache = Mock(YangTextSchemaSourceSetCache)

 

     def dataspaceName = 'someDataspace'

@@ -43,9 +45,10 @@ class E2ENetworkSliceSpec extends Specification {
     def schemaSetName = 'someSchemaSet'

 

     def setup() {

-        cpsDataServiceImple.cpsDataPersistenceService = mockDataStoreService

-        cpsDataServiceImple.cpsAdminService = mockCpsAdminService

-        cpsDataServiceImple.yangTextSchemaSourceSetCache = mockYangTextSchemaSourceSetCache

+        cpsDataServiceImpl.cpsDataPersistenceService = mockDataStoreService

+        cpsDataServiceImpl.cpsAdminService = mockCpsAdminService

+        cpsDataServiceImpl.yangTextSchemaSourceSetCache = mockYangTextSchemaSourceSetCache

+        cpsDataServiceImpl.notificationService = mockNotificationService

         cpsModuleServiceImpl.yangTextSchemaSourceSetCache = mockYangTextSchemaSourceSetCache

         cpsModuleServiceImpl.cpsModulePersistenceService = mockModuleStoreService

     }

@@ -88,7 +91,7 @@ class E2ENetworkSliceSpec extends Specification {
                     YangTextSchemaSourceSetBuilder.of(yangResourcesNameToContentMap)

             mockModuleStoreService.getYangSchemaResources(dataspaceName, schemaSetName) >> schemaContext

         when: 'saveData method is invoked'

-            cpsDataServiceImple.saveData(dataspaceName, anchorName, jsonData)

+            cpsDataServiceImpl.saveData(dataspaceName, anchorName, jsonData)

         then: 'Parameters are validated and processing is delegated to persistence service'

             1 * mockDataStoreService.storeDataNode('someDataspace', 'someAnchor', _) >>

                     { args -> dataNodeStored = args[2]}

@@ -120,7 +123,7 @@ class E2ENetworkSliceSpec extends Specification {
             mockYangTextSchemaSourceSetCache.get('someDataspace', 'someSchemaSet') >> YangTextSchemaSourceSetBuilder.of(yangResourcesNameToContentMap)

             mockModuleStoreService.getYangSchemaResources('someDataspace', 'someSchemaSet') >> schemaContext

         when: 'saveData method is invoked'

-            cpsDataServiceImple.saveData('someDataspace', 'someAnchor', jsonData)

+            cpsDataServiceImpl.saveData('someDataspace', 'someAnchor', jsonData)

         then: 'parameters are validated and processing is delegated to persistence service'

             1 * mockDataStoreService.storeDataNode('someDataspace', 'someAnchor', _) >>

                     { args -> dataNodeStored = args[2]}

diff --git a/cps-service/src/test/groovy/org/onap/cps/notification/CpsDataUpdateEventFactorySpec.groovy b/cps-service/src/test/groovy/org/onap/cps/notification/CpsDataUpdateEventFactorySpec.groovy
new file mode 100644
index 000000000..aecc3f7ee
--- /dev/null
+++ b/cps-service/src/test/groovy/org/onap/cps/notification/CpsDataUpdateEventFactorySpec.groovy
@@ -0,0 +1,86 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification
+
+import org.onap.cps.api.CpsAdminService
+import org.onap.cps.api.CpsDataService
+import org.onap.cps.event.model.CpsDataUpdatedEvent
+import org.onap.cps.event.model.Data
+import org.onap.cps.spi.FetchDescendantsOption
+import org.onap.cps.spi.model.Anchor
+import org.onap.cps.spi.model.DataNodeBuilder
+import org.springframework.util.StringUtils
+import spock.lang.Specification
+
+import java.time.format.DateTimeFormatter
+
+class CpsDataUpdateEventFactorySpec extends Specification {
+
+    def mockCpsDataService = Mock(CpsDataService)
+    def mockCpsAdminService = Mock(CpsAdminService)
+
+    def objectUnderTest = new CpsDataUpdatedEventFactory(mockCpsDataService, mockCpsAdminService)
+
+    def myDataspaceName = 'my-dataspace'
+    def myAnchorName = 'my-anchorname'
+    def mySchemasetName = 'my-schemaset-name'
+    def dateTimeFormat = 'yyyy-MM-dd\'T\'HH:mm:ss.SSSZ'
+
+    def 'Create a CPS data updated event successfully.'() {
+
+        given: 'cps admin service is able to return anchor details'
+            mockCpsAdminService.getAnchor(myDataspaceName, myAnchorName) >>
+                new Anchor(myAnchorName, myDataspaceName, mySchemasetName)
+        and: 'cps data service returns the data node details'
+            def xpath = '/'
+            def dataNode = new DataNodeBuilder().withXpath(xpath).withLeaves(['leafName': 'leafValue']).build()
+            mockCpsDataService.getDataNode(
+                    myDataspaceName, myAnchorName, xpath, FetchDescendantsOption.INCLUDE_ALL_DESCENDANTS) >> dataNode
+
+        when: 'CPS data updated event is created'
+            def cpsDataUpdatedEvent = objectUnderTest.createCpsDataUpdatedEvent(myDataspaceName, myAnchorName)
+
+        then: 'CPS data updated event is created with expected values'
+            with(cpsDataUpdatedEvent) {
+                type == 'org.onap.cps.data-updated-event'
+                source == new URI('urn:cps:org.onap.cps')
+                schema == CpsDataUpdatedEvent.Schema.URN_CPS_ORG_ONAP_CPS_DATA_UPDATED_EVENT_SCHEMA_1_1_0_SNAPSHOT
+                StringUtils.hasText(id)
+                content != null
+            }
+            with(cpsDataUpdatedEvent.content) {
+                assert isExpectedDateTimeFormat(observedTimestamp): "$observedTimestamp is not in $dateTimeFormat format"
+                anchorName == myAnchorName
+                dataspaceName == myDataspaceName
+                schemaSetName == mySchemasetName
+                data == new Data().withAdditionalProperty('leafName', 'leafValue')
+            }
+    }
+
+    def isExpectedDateTimeFormat(String observedTimestamp) {
+        try {
+            DateTimeFormatter.ofPattern(dateTimeFormat).parse(observedTimestamp)
+        } catch (DateTimeParseException) {
+            return false
+        }
+        return true
+    }
+
+}
diff --git a/cps-service/src/test/groovy/org/onap/cps/notification/KafkaPublisherSpecBase.groovy b/cps-service/src/test/groovy/org/onap/cps/notification/KafkaPublisherSpecBase.groovy
new file mode 100644
index 000000000..b60b38f05
--- /dev/null
+++ b/cps-service/src/test/groovy/org/onap/cps/notification/KafkaPublisherSpecBase.groovy
@@ -0,0 +1,93 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification
+
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration
+import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.kafka.config.TopicBuilder
+import org.springframework.kafka.core.ConsumerFactory
+import org.springframework.kafka.core.KafkaAdmin
+import org.springframework.kafka.core.KafkaTemplate
+import org.springframework.kafka.listener.ConcurrentMessageListenerContainer
+import org.springframework.kafka.listener.ContainerProperties
+import org.springframework.kafka.listener.MessageListener
+import org.springframework.kafka.test.utils.ContainerTestUtils
+import org.springframework.test.context.ContextConfiguration
+import org.springframework.test.context.DynamicPropertyRegistry
+import org.springframework.test.context.DynamicPropertySource
+import spock.lang.Shared
+import spock.lang.Specification
+
+@ContextConfiguration(classes = [KafkaAutoConfiguration, KafkaProducerListener, NotificationErrorHandler])
+@SpringBootTest
+class KafkaPublisherSpecBase extends Specification {
+
+    @Autowired
+    KafkaTemplate kafkaTemplate
+
+    @Autowired
+    KafkaAdmin kafkaAdmin
+
+    @Autowired
+    ConsumerFactory consumerFactory
+
+    @Shared volatile topicCreated = false
+    @Shared consumedMessages = new ArrayList<>()
+
+    def cpsEventTopic = 'cps-events'
+
+    @DynamicPropertySource
+    static void registerKafkaProperties(DynamicPropertyRegistry registry) {
+        registry.add("spring.kafka.bootstrap-servers", KafkaTestContainerConfig::getBootstrapServers)
+    }
+
+    def setup() {
+        // Kafka listener and topic should be created only once for a test-suite.
+        // We are also dependent on sprint context to achieve it, and can not execute it in setupSpec
+        if (!topicCreated) {
+            kafkaAdmin.createOrModifyTopics(TopicBuilder.name(cpsEventTopic).partitions(1).replicas(1).build())
+            startListeningToTopic()
+            topicCreated = true
+        }
+        /* kafka message listener stores the messages to consumedMessages.
+            It is important to clear the list before each test case so that test cases can fetch the message from index '0'.
+         */
+        consumedMessages.clear()
+    }
+
+    def startListeningToTopic() {
+        ContainerProperties containerProperties = new ContainerProperties(cpsEventTopic)
+        containerProperties.setMessageListener([
+                onMessage: {
+                    record ->
+                        consumedMessages.add(record.value())
+                }] as MessageListener)
+
+        ConcurrentMessageListenerContainer container =
+                new ConcurrentMessageListenerContainer<>(
+                        consumerFactory,
+                        containerProperties)
+
+        container.start()
+        ContainerTestUtils.waitForAssignment(container, 1)
+    }
+
+}
diff --git a/cps-service/src/test/groovy/org/onap/cps/notification/KafkaTestContainerConfig.groovy b/cps-service/src/test/groovy/org/onap/cps/notification/KafkaTestContainerConfig.groovy
new file mode 100644
index 000000000..5124a519a
--- /dev/null
+++ b/cps-service/src/test/groovy/org/onap/cps/notification/KafkaTestContainerConfig.groovy
@@ -0,0 +1,49 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification
+
+import org.testcontainers.containers.KafkaContainer
+import org.testcontainers.utility.DockerImageName
+
+class KafkaTestContainerConfig {
+
+    private static KafkaContainer kafkaContainer
+
+    static {
+        getKafkaContainer()
+    }
+
+    // Not the best performance but it is good enough for test case
+    private static synchronized KafkaContainer getKafkaContainer() {
+        if (kafkaContainer == null) {
+            kafkaContainer = new KafkaContainer(DockerImageName.parse("confluentinc/cp-kafka:6.1.1"))
+                    .withEnv("KAFKA_AUTO_CREATE_TOPICS_ENABLE", "false")
+            kafkaContainer.start()
+            Runtime.getRuntime().addShutdownHook(new Thread(kafkaContainer::stop))
+        }
+        return kafkaContainer
+    }
+
+    static String getBootstrapServers() {
+        getKafkaContainer()
+        return kafkaContainer.getBootstrapServers()
+    }
+
+}
diff --git a/cps-service/src/test/groovy/org/onap/cps/notification/NotificationPublisherSpec.groovy b/cps-service/src/test/groovy/org/onap/cps/notification/NotificationPublisherSpec.groovy
new file mode 100644
index 000000000..f215c6dc0
--- /dev/null
+++ b/cps-service/src/test/groovy/org/onap/cps/notification/NotificationPublisherSpec.groovy
@@ -0,0 +1,91 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification
+
+import org.apache.kafka.clients.producer.ProducerRecord
+import org.apache.kafka.clients.producer.RecordMetadata
+import org.onap.cps.event.model.Content
+import org.onap.cps.event.model.CpsDataUpdatedEvent
+import org.spockframework.spring.SpringBean
+import org.springframework.kafka.KafkaException
+import org.springframework.kafka.core.KafkaTemplate
+import spock.util.concurrent.PollingConditions
+
+class NotificationPublisherSpec extends KafkaPublisherSpecBase {
+
+    @SpringBean
+    NotificationErrorHandler spyNotificationErrorHandler = Spy(new NotificationErrorHandler())
+
+    @SpringBean
+    KafkaProducerListener spyKafkaProducerListener = Spy(new KafkaProducerListener<>(spyNotificationErrorHandler))
+
+    KafkaTemplate spyKafkaTemplate
+    NotificationPublisher objectUnderTest
+
+    def myAnchorName = 'my-anchor'
+    def myDataspaceName = 'my-dataspace'
+
+    def cpsDataUpdatedEvent = new CpsDataUpdatedEvent()
+            .withContent(new Content()
+                    .withDataspaceName(myDataspaceName)
+                    .withAnchorName(myAnchorName))
+
+    def setup() {
+        spyKafkaTemplate = Spy(kafkaTemplate)
+        objectUnderTest = new NotificationPublisher(spyKafkaTemplate, cpsEventTopic);
+    }
+
+    def 'Sending event to message bus with correct message Key.'() {
+
+        when: 'event is sent to publisher'
+            objectUnderTest.sendNotification(cpsDataUpdatedEvent)
+            kafkaTemplate.flush()
+
+        then: 'event is sent to correct topic with the expected messageKey'
+            interaction {
+                def messageKey = myDataspaceName + "," + myAnchorName
+                1 * spyKafkaTemplate.send(cpsEventTopic, messageKey, cpsDataUpdatedEvent)
+            }
+        and: 'received a successful response'
+            1 * spyKafkaProducerListener.onSuccess(_ as ProducerRecord, _)
+        and: 'kafka consumer returns expected message'
+            def conditions = new PollingConditions(timeout: 60, initialDelay: 0, factor: 1)
+            conditions.eventually {
+                assert cpsDataUpdatedEvent == consumedMessages.get(0)
+            }
+    }
+
+    def 'Handling of async errors from message bus.'() {
+        given: 'topic does not exist'
+            objectUnderTest.topicName = 'non-existing-topic'
+
+        when: 'message to sent to a non-existing topic'
+            objectUnderTest.sendNotification(cpsDataUpdatedEvent)
+            kafkaTemplate.flush()
+
+        then: 'error is thrown'
+            thrown KafkaException
+        and: 'error handler is called with exception details'
+            1 * spyKafkaProducerListener.onError(_ as ProducerRecord, _, _ as Exception)
+            1 * spyNotificationErrorHandler.onException(_ as String, _ as Exception,
+                    _ as ProducerRecord, _)
+    }
+
+}
diff --git a/cps-service/src/test/groovy/org/onap/cps/notification/NotificationServiceSpec.groovy b/cps-service/src/test/groovy/org/onap/cps/notification/NotificationServiceSpec.groovy
new file mode 100644
index 000000000..a74279548
--- /dev/null
+++ b/cps-service/src/test/groovy/org/onap/cps/notification/NotificationServiceSpec.groovy
@@ -0,0 +1,78 @@
+/*
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  ================================================================================
+ *  Licensed 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.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *  ============LICENSE_END=========================================================
+ */
+
+package org.onap.cps.notification
+
+import org.onap.cps.event.model.CpsDataUpdatedEvent
+import spock.lang.Specification
+
+class NotificationServiceSpec extends Specification {
+
+    def mockNotificationPublisher = Mock(NotificationPublisher)
+    def spyNotificationErrorHandler = Spy(new NotificationErrorHandler())
+    def mockCpsDataUpdatedEventFactory = Mock(CpsDataUpdatedEventFactory)
+
+    def objectUnderTest = new NotificationService(true, mockNotificationPublisher,
+            mockCpsDataUpdatedEventFactory, spyNotificationErrorHandler)
+
+    def myDataspaceName = 'my-dataspace'
+    def myAnchorName = 'my-anchorname'
+
+    def 'Skip sending notification when disabled.'() {
+
+        given: 'notification is disabled'
+            objectUnderTest.dataUpdatedEventNotificationEnabled = false
+
+        when: 'dataUpdatedEvent is received'
+            objectUnderTest.processDataUpdatedEvent(myDataspaceName, myAnchorName)
+
+        then: 'the notification is not sent'
+            0 * mockNotificationPublisher.sendNotification(_)
+    }
+
+    def 'Send notification when enabled.'() {
+
+        given: 'notification is enabled'
+            objectUnderTest.dataUpdatedEventNotificationEnabled = true
+        and: 'event factory can create event successfully'
+            def cpsDataUpdatedEvent = new CpsDataUpdatedEvent()
+            mockCpsDataUpdatedEventFactory.createCpsDataUpdatedEvent(myDataspaceName, myAnchorName) >> cpsDataUpdatedEvent
+
+        when: 'dataUpdatedEvent is received'
+            objectUnderTest.processDataUpdatedEvent(myDataspaceName, myAnchorName)
+
+        then: 'notification is sent with correct event'
+            1 * mockNotificationPublisher.sendNotification(cpsDataUpdatedEvent)
+    }
+
+    def 'Error handling in notification service.'(){
+        given: 'event factory can not create event successfully'
+            mockCpsDataUpdatedEventFactory.createCpsDataUpdatedEvent(myDataspaceName, myAnchorName) >>
+                    { throw new Exception("Could not create event") }
+
+        when: 'event is sent for processing'
+            objectUnderTest.processDataUpdatedEvent(myDataspaceName, myAnchorName)
+
+        then: 'error is handled and not thrown to caller'
+            notThrown Exception
+            1 * spyNotificationErrorHandler.onException(_,_,_,_)
+
+    }
+
+}
diff --git a/cps-service/src/test/resources/application.yml b/cps-service/src/test/resources/application.yml
new file mode 100644
index 000000000..c934486fc
--- /dev/null
+++ b/cps-service/src/test/resources/application.yml
@@ -0,0 +1,41 @@
+#  ============LICENSE_START=======================================================
+#  Copyright (C) 2021 Bell Canada. All rights reserved.
+#  ================================================================================
+#  Licensed 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.
+#
+#  SPDX-License-Identifier: Apache-2.0
+#  ============LICENSE_END=========================================================
+
+notification:
+  data-updated:
+    topic: cps-event
+    enabled: true
+
+spring:
+  kafka:
+    properties:
+      request.timeout.ms: 5000
+      retries: 1
+      max.block.ms: 10000
+    producer:
+      value-serializer: org.springframework.kafka.support.serializer.JsonSerializer
+      cliend-id: cps
+    consumer:
+      group-id: cps-test
+      auto-offset-reset: earliest
+      value-deserializer: org.springframework.kafka.support.serializer.JsonDeserializer
+      properties:
+        spring.json.value.default.type: org.onap.cps.event.model.CpsDataUpdatedEvent
+
+logging:
+  level:
+    org.apache.kafka: ERROR
diff --git a/docker-compose/README.md b/docker-compose/README.md
index c172276eb..3fe7f9940 100644
--- a/docker-compose/README.md
+++ b/docker-compose/README.md
@@ -50,8 +50,13 @@ mvn clean install -P<docker-profile>
 `docker-compose/docker-compose.yml` file is provided to be run with `docker-compose` tool and images previously built.
 It starts both Postgres database and CPS services.
 
-1. Edit `docker-compose.yml` and uncomment desired service to be deployed, by default `cps-and-ncmp`
-   is enabled. You can comment it and uncomment `cps-standalone` or `ncmp-standalone`.
+1. Edit `docker-compose.yml`
+   1. uncomment desired service to be deployed, by default `cps-and-ncmp` is enabled. You can comment it and uncomment `cps-standalone` or `ncmp-standalone`.
+   2. To send data-updated events to kafka, 
+      * uncomment the `zookeeper` and `kafka` services. 
+      * uncomment environment variables 
+        * `notification.data-updated.enabled: 'true'`
+        * `KAFKA_BOOTSTRAP_SERVER: kafka:9092`
 2. Execute following command from `docker-compose` folder:
 
 Use one of the below version type that has been generated in the local system's docker image list after the build.
@@ -59,7 +64,7 @@ Use one of the below version type that has been generated in the local system's
 VERSION=latest DB_USERNAME=cps DB_PASSWORD=cps docker-compose up -d
 or
 VERSION=<version> DB_USERNAME=cps DB_PASSWORD=cps docker-compose up -d
-``` 
+```
 
 ## Running or debugging Java built code
 
diff --git a/docker-compose/docker-compose.yml b/docker-compose/docker-compose.yml
index 2878462a3..51bb162b2 100755
--- a/docker-compose/docker-compose.yml
+++ b/docker-compose/docker-compose.yml
@@ -30,6 +30,8 @@ services:
   #    DB_HOST: dbpostgresql
   #    DB_USERNAME: ${DB_USERNAME:-cps}
   #    DB_PASSWORD: ${DB_PASSWORD:-cps}
+  #    #KAFKA_BOOTSTRAP_SERVER: kafka:9092
+  #    #notification.data-updated.enabled: 'true'
   #  restart: unless-stopped
   #  depends_on:
   #    - dbpostgresql
@@ -45,6 +47,8 @@ services:
   #    DB_HOST: dbpostgresql
   #    DB_USERNAME: ${DB_USERNAME:-cps}
   #    DB_PASSWORD: ${DB_PASSWORD:-cps}
+  #    #KAFKA_BOOTSTRAP_SERVER: kafka:9092
+  #    #notification.data-updated.enabled: 'true'
   #  restart: unless-stopped
   #  depends_on:
   #    - dbpostgresql
@@ -60,6 +64,8 @@ services:
       DB_HOST: dbpostgresql
       DB_USERNAME: ${DB_USERNAME:-cps}
       DB_PASSWORD: ${DB_PASSWORD:-cps}
+      #KAFKA_BOOTSTRAP_SERVER: kafka:9092
+      #notification.data-updated.enabled: 'true'
     restart: unless-stopped
     depends_on:
       - dbpostgresql
@@ -73,3 +79,25 @@ services:
       POSTGRES_DB: cpsdb
       POSTGRES_USER: ${DB_USERNAME:-cps}
       POSTGRES_PASSWORD: ${DB_PASSWORD:-cps}
+
+#  zookeeper:
+#    image: confluentinc/cp-zookeeper:6.1.1
+#    environment:
+#      ZOOKEEPER_CLIENT_PORT: 2181
+#      ZOOKEEPER_TICK_TIME: 2000
+#    ports:
+#      - 22181:2181
+#
+#  kafka:
+#    image: confluentinc/cp-kafka:6.1.1
+#    depends_on:
+#      - zookeeper
+#    ports:
+#      - 29092:29092
+#    environment:
+#      KAFKA_BROKER_ID: 1
+#      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+#      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092,PLAINTEXT_HOST://localhost:29092
+#      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
+#      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
+#      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1