1 files changed, 79 insertions, 0 deletions
diff --git a/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/bus/internal/SingleThreadedKafkaTopicSource.java b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/bus/internal/SingleThreadedKafkaTopicSource.java
new file mode 100644
index 00000000..869273f0
--- /dev/null
+++ b/policy-endpoints/src/main/java/org/onap/policy/common/endpoints/event/comm/bus/internal/SingleThreadedKafkaTopicSource.java
@@ -0,0 +1,79 @@
+/*
+ * ============LICENSE_START=======================================================
+ * Copyright (C) 2022-2023 Nordix Foundation.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.policy.common.endpoints.event.comm.bus.internal;
+
+import java.net.MalformedURLException;
+import java.util.Map;
+import org.onap.policy.common.endpoints.event.comm.Topic;
+import org.onap.policy.common.endpoints.event.comm.bus.KafkaTopicSource;
+
+/**
+ * This topic source implementation specializes in reading messages over a Kafka Bus topic source and
+ * notifying its listeners.
+ */
+public class SingleThreadedKafkaTopicSource extends SingleThreadedBusTopicSource implements KafkaTopicSource {
+
+    protected Map<String, String> additionalProps = null;
+
+    /**
+     * Constructor.
+     *
+     * @param busTopicParams Parameters object containing all the required inputs
+     * @throws IllegalArgumentException An invalid parameter passed in
+     */
+    public SingleThreadedKafkaTopicSource(BusTopicParams busTopicParams) {
+        super(busTopicParams);
+        this.additionalProps = busTopicParams.getAdditionalProps();
+        try {
+            this.init();
+        } catch (Exception e) {
+            throw new IllegalArgumentException("ERROR during init in kafka-source: cannot create topic " + topic, e);
+        }
+    }
+
+    /**
+     * Initialize the Cambria client.
+     */
+    @Override
+    public void init() throws MalformedURLException {
+        BusTopicParams.TopicParamsBuilder builder = BusTopicParams.builder()
+                .servers(this.servers)
+                .topic(this.effectiveTopic)
+                .fetchTimeout(this.fetchTimeout)
+                .consumerGroup(this.consumerGroup)
+                .useHttps(this.useHttps)
+                .allowTracing(this.allowTracing);
+
+        this.consumer = new BusConsumer.KafkaConsumerWrapper(builder
+                        .additionalProps(this.additionalProps)
+                        .build());
+    }
+
+    @Override
+    public CommInfrastructure getTopicCommInfrastructure() {
+        return Topic.CommInfrastructure.KAFKA;
+    }
+
+    @Override
+    public String toString() {
+        return "SingleThreadedKafkaTopicSource [getTopicCommInfrastructure()=" + getTopicCommInfrastructure()
+            + ", toString()=" + super.toString() + "]";
+    }
+
+}