diff options
Diffstat (limited to 'netconfsimulator/src/main/java/org/onap/netconfsimulator/kafka/listener/KafkaListenerHandler.java')
-rw-r--r-- | netconfsimulator/src/main/java/org/onap/netconfsimulator/kafka/listener/KafkaListenerHandler.java | 67 |
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); + } +} |