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/*-
* ============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<String, String> 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);
}
}
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