Add support for KafkaAvroSerializer in apex-pdp

Adding the support for KafkaAvroSerializer to deserialize the
messages sent on a kafka topic using the KafkaAvroSerializer.

The default StringDeserializer that comes from KafkaConsumer
is not able to work with avro encoded messages.

Issue-ID: POLICY-4369
Change-Id: Ia97bee9546baa78c237e21a220df9374b84121dd
Signed-off-by: Ram Krishna Verma <ram_krishna.verma@bell.ca>

3 files changed, 47 insertions, 6 deletions

diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/pom.xml b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/pom.xml
index 85cbe0f6e..0423db448 100644
--- a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/pom.xml
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/pom.xml
@@ -1,6 +1,7 @@
 <!--
   ============LICENSE_START=======================================================
    Copyright (C) 2018 Ericsson. All rights reserved.
+   Modifications Copyright (C) 2022 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.
@@ -35,5 +36,17 @@
             <artifactId>kafka-clients</artifactId>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>io.confluent</groupId>
+            <artifactId>kafka-avro-serializer</artifactId>
+            <version>7.2.1</version>
+        </dependency>
     </dependencies>
+
+    <repositories>
+        <repository>
+            <id>confluent</id>
+            <url>https://packages.confluent.io/maven/</url>
+        </repository>
+    </repositories>
 </project>
diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/main/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaConsumer.java b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/main/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaConsumer.java
index 95379d457..55d46b522 100644
--- a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/main/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaConsumer.java
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/main/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaConsumer.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
  *  Modifications Copyright (C) 2019-2020 Nordix Foundation.
- *  Modifications Copyright (C) 2021 Bell Canada. All rights reserved.
+ *  Modifications Copyright (C) 2021-2022 Bell Canada. All rights reserved.
  *  Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
  * ================================================================================
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -75,7 +75,7 @@ public class ApexKafkaConsumer extends ApexPluginsEventConsumer {
     @Override
     public void run() {
         // Kick off the Kafka consumer
-        try (KafkaConsumer<String, String> kafkaConsumer =
+        try (KafkaConsumer<String, Object> kafkaConsumer =
             new KafkaConsumer<>(kafkaConsumerProperties.getKafkaConsumerProperties())) {
             kafkaConsumer.subscribe(kafkaConsumerProperties.getConsumerTopicListAsCollection());
             if (LOGGER.isDebugEnabled()) {
@@ -86,11 +86,11 @@ public class ApexKafkaConsumer extends ApexPluginsEventConsumer {
             // The endless loop that receives events over Kafka
             while (consumerThread.isAlive() && !stopOrderedFlag) {
                 try {
-                    final ConsumerRecords<String, String> records =
+                    final ConsumerRecords<String, Object> records =
                         kafkaConsumer.poll(kafkaConsumerProperties.getConsumerPollDuration());
-                    for (final ConsumerRecord<String, String> dataRecord : records) {
+                    for (final ConsumerRecord<String, Object> dataRecord : records) {
                         traceIfTraceEnabled(dataRecord);
-                        eventReceiver.receiveEvent(new Properties(), dataRecord.value());
+                        eventReceiver.receiveEvent(new Properties(), dataRecord.value().toString());
                     }
                 } catch (final Exception e) {
                     LOGGER.debug("error receiving events on thread {}", consumerThread.getName(), e);
@@ -104,7 +104,7 @@ public class ApexKafkaConsumer extends ApexPluginsEventConsumer {
      *
      * @param dataRecord the record to trace
      */
-    private void traceIfTraceEnabled(final ConsumerRecord<String, String> dataRecord) {
+    private void traceIfTraceEnabled(final ConsumerRecord<String, Object> dataRecord) {
         if (LOGGER.isTraceEnabled()) {
             LOGGER.trace("event received for {} for forwarding to Apex engine : {} {}",
                 this.getClass().getName() + ":" + this.name, dataRecord.key(), dataRecord.value());
diff --git a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/test/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaConsumerTest.java b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/test/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaConsumerTest.java
index edb4a1a7b..1ef3550e4 100644
--- a/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/test/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaConsumerTest.java
+++ b/plugins/plugins-event/plugins-event-carrier/plugins-event-carrier-kafka/src/test/java/org/onap/policy/apex/plugins/event/carrier/kafka/ApexKafkaConsumerTest.java
@@ -2,6 +2,7 @@
  * ============LICENSE_START=======================================================
  *  Copyright (C) 2019 Samsung. All rights reserved.
  *  Modifications Copyright (C) 2020 Nordix Foundation
+ *  Modifications Copyright (C) 2022 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.
@@ -38,9 +39,12 @@ import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMo
 
 public class ApexKafkaConsumerTest {
     ApexKafkaConsumer apexKafkaConsumer = null;
+    ApexKafkaConsumer apexKafkaConsumer2 = null;
     EventHandlerParameters consumerParameters = null;
+    EventHandlerParameters consumerParameters2 = null;
     ApexEventReceiver incomingEventReceiver = null;
     ApexEventProducer apexKafkaProducer = null;
+    KafkaCarrierTechnologyParameters kafkaParameters = null;
 
     /**
      * Set up testing.
@@ -55,21 +59,37 @@ public class ApexKafkaConsumerTest {
         consumerParameters
                 .setCarrierTechnologyParameters(new KafkaCarrierTechnologyParameters() {});
         apexKafkaConsumer.init("TestApexKafkaConsumer", consumerParameters, incomingEventReceiver);
+
+        apexKafkaConsumer2 = new ApexKafkaConsumer();
+        consumerParameters2 = new EventHandlerParameters();
+        kafkaParameters = new KafkaCarrierTechnologyParameters();
+        String[][] kafkaProperties = {
+            {"value.deserializer", "io.confluent.kafka.serializers.KafkaAvroDeserializer"},
+            {"schema.registry.url", "[http://test-registory:8080]"}
+        };
+        kafkaParameters.setKafkaProperties(kafkaProperties);
+
+        consumerParameters2
+                .setCarrierTechnologyParameters(kafkaParameters);
+        apexKafkaConsumer2.init("TestApexKafkaConsumer2", consumerParameters2, incomingEventReceiver);
     }
 
     @Test
     public void testStart() {
         assertThatCode(apexKafkaConsumer::start).doesNotThrowAnyException();
+        assertThatCode(apexKafkaConsumer2::start).doesNotThrowAnyException();
     }
 
     @Test
     public void testGetName() {
         assertEquals("TestApexKafkaConsumer", apexKafkaConsumer.getName());
+        assertEquals("TestApexKafkaConsumer2", apexKafkaConsumer2.getName());
     }
 
     @Test
     public void testGetPeeredReference() {
         assertNull(apexKafkaConsumer.getPeeredReference(EventHandlerPeeredMode.REQUESTOR));
+        assertNull(apexKafkaConsumer2.getPeeredReference(EventHandlerPeeredMode.REQUESTOR));
     }
 
     @Test
@@ -78,22 +98,30 @@ public class ApexKafkaConsumerTest {
                 apexKafkaConsumer, apexKafkaProducer);
         apexKafkaConsumer.setPeeredReference(EventHandlerPeeredMode.REQUESTOR, peeredReference);
         assertNotNull(apexKafkaConsumer.getPeeredReference(EventHandlerPeeredMode.REQUESTOR));
+
+        PeeredReference peeredReference2 = new PeeredReference(EventHandlerPeeredMode.REQUESTOR,
+                        apexKafkaConsumer2, apexKafkaProducer);
+        apexKafkaConsumer2.setPeeredReference(EventHandlerPeeredMode.REQUESTOR, peeredReference2);
+        assertNotNull(apexKafkaConsumer2.getPeeredReference(EventHandlerPeeredMode.REQUESTOR));
     }
 
     @Test(expected = java.lang.NullPointerException.class)
     public void testRun() {
         apexKafkaConsumer.run();
+        apexKafkaConsumer2.run();
     }
 
     @Test(expected = java.lang.NullPointerException.class)
     public void testStop() {
         apexKafkaConsumer.stop();
+        apexKafkaConsumer2.stop();
     }
 
     @Test(expected = ApexEventException.class)
     public void testInitWithNonKafkaCarrierTechnologyParameters() throws ApexEventException {
         consumerParameters.setCarrierTechnologyParameters(new CarrierTechnologyParameters() {});
         apexKafkaConsumer.init("TestApexKafkaConsumer", consumerParameters, incomingEventReceiver);
+        apexKafkaConsumer2.init("TestApexKafkaConsumer2", consumerParameters, incomingEventReceiver);
     }
 
 }