org.springframework.kafka.listener.adapter.FilteringBatchMessageListenerAdapter Maven / Gradle / Ivy
/*
* Copyright 2016 the original author or authors.
*
* 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.
*/
package org.springframework.kafka.listener.adapter;
import java.util.Iterator;
import java.util.List;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.springframework.kafka.listener.BatchMessageListener;
/**
* A {@link BatchMessageListener} adapter that implements filter logic
* via a {@link RecordFilterStrategy}.
*
* @param the key type.
* @param the value type.
*
* @author Gary Russell
*
*/
public class FilteringBatchMessageListenerAdapter
extends AbstractFilteringMessageListener>
implements BatchMessageListener {
/**
* Create an instance with the supplied strategy and delegate listener.
* @param delegate the delegate.
* @param recordFilterStrategy the filter.
*/
public FilteringBatchMessageListenerAdapter(BatchMessageListener delegate,
RecordFilterStrategy recordFilterStrategy) {
super(delegate, recordFilterStrategy);
}
@Override
public void onMessage(List> consumerRecords) {
Iterator> iterator = consumerRecords.iterator();
while (iterator.hasNext()) {
if (filter(iterator.next())) {
iterator.remove();
}
}
if (consumerRecords.size() > 0) {
this.delegate.onMessage(consumerRecords);
}
}
}