1 files changed, 67 insertions, 0 deletions
diff --git a/netconfsimulator/src/main/java/org/onap/netconfsimulator/kafka/listener/KafkaListenerHandler.java b/netconfsimulator/src/main/java/org/onap/netconfsimulator/kafka/listener/KafkaListenerHandler.java
new file mode 100644
index 0000000..604315d
--- /dev/null
+++ b/netconfsimulator/src/main/java/org/onap/netconfsimulator/kafka/listener/KafkaListenerHandler.java
@@ -0,0 +1,67 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * Simulator
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. 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.
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.netconfsimulator.kafka.listener;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.kafka.core.ConsumerFactory;
+
+import org.springframework.kafka.listener.ContainerProperties;
+import org.springframework.kafka.listener.KafkaMessageListenerContainer;
+import org.springframework.kafka.listener.MessageListener;
+
+
+import org.springframework.kafka.support.TopicPartitionInitialOffset;
+
+import java.time.Instant;
+
+public class KafkaListenerHandler {
+
+    private static final int PARTITION = 0;
+    private static final long NUMBER_OF_HISTORICAL_MESSAGES_TO_SHOW = -10L;
+    private static final boolean RELATIVE_TO_CURRENT = false;
+    private ConsumerFactory<String, String> consumerFactory;
+
+
+    @Autowired
+    public KafkaListenerHandler(ConsumerFactory<String, String> consumerFactory) {
+        this.consumerFactory = consumerFactory;
+    }
+
+
+    public KafkaListenerEntry createKafkaListener(MessageListener messageListener, String topicName) {
+        String clientId = Long.toString(Instant.now().getEpochSecond());
+        ContainerProperties containerProperties = new ContainerProperties(topicName);
+        containerProperties.setGroupId(clientId);
+        KafkaMessageListenerContainer<String, String> listenerContainer = createListenerContainer(containerProperties,
+            topicName);
+
+        listenerContainer.setupMessageListener(messageListener);
+        return new KafkaListenerEntry(clientId, listenerContainer);
+    }
+
+
+    KafkaMessageListenerContainer<String, String> createListenerContainer(ContainerProperties containerProperties,
+        String topicName) {
+        TopicPartitionInitialOffset config = new TopicPartitionInitialOffset(topicName, PARTITION,
+            NUMBER_OF_HISTORICAL_MESSAGES_TO_SHOW, RELATIVE_TO_CURRENT);
+        return new KafkaMessageListenerContainer<>(consumerFactory, containerProperties, config);
+    }
+}