org.apache.apex.malhar.kafka.KafkaConsumer09.java Source code

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.apex.malhar.kafka;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.hadoop.classification.InterfaceStability;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;
import org.apache.kafka.clients.consumer.OffsetAndMetadata;
import org.apache.kafka.clients.consumer.OffsetCommitCallback;
import org.apache.kafka.common.Metric;
import org.apache.kafka.common.MetricName;
import org.apache.kafka.common.TopicPartition;

import com.google.common.collect.Iterables;

/**
 * Wrapper for 0.9.x version of Kafka consumer
 *
 * @since 3.8.0
 */
@InterfaceStability.Evolving
public class KafkaConsumer09 implements AbstractKafkaConsumer {
    private KafkaConsumer<byte[], byte[]> consumer;

    public KafkaConsumer09(Properties properties) {
        consumer = new KafkaConsumer<>(properties);
    }

    /**
     * Checks whether the consumer contains the specified partition or not
     * @param topicPartition topic partition
     * @return true if consumer contains the given partition, otherwise false
     */
    @Override
    public boolean isConsumerContainsPartition(TopicPartition topicPartition) {
        return consumer.assignment().contains(topicPartition);
    }

    /**
     * Seek to the specified offset for the given partition
     * @param topicPartition topic partition
     * @param offset given offset
     */
    @Override
    public void seekToOffset(TopicPartition topicPartition, long offset) {
        consumer.seek(topicPartition, offset);
    }

    /**
     * Fetch data for the topics or partitions specified using assign API.
     * @param timeOut time in milliseconds, spent waiting in poll if data is not available in buffer.
     * @return records
     */
    @Override
    public ConsumerRecords<byte[], byte[]> pollRecords(long timeOut) {
        return consumer.poll(timeOut);
    }

    /**
     * Commit the specified offsets for the specified list of topics and partitions to Kafka.
     * @param offsets given offsets
     * @param callback Callback to invoke when the commit completes
     */
    @Override
    public void commitAsync(Map<TopicPartition, OffsetAndMetadata> offsets, OffsetCommitCallback callback) {
        consumer.commitAsync(offsets, callback);
    }

    /**
     * Assign the specified list of partitions to the consumer
     * @param partitions list of partitions
     */
    @Override
    public void assignPartitions(List<TopicPartition> partitions) {
        consumer.assign(partitions);
    }

    /**
     * Seek to the first offset for the specified list of partitions
     * @param partitions list of partitions
     */
    @Override
    public void seekToBeginning(TopicPartition... partitions) {
        consumer.seekToBeginning(partitions);
    }

    /**
     * Seek to the last offser for the specified list of partitions
     * @param partitions list of partitions
     */
    @Override
    public void seekToEnd(TopicPartition... partitions) {
        consumer.seekToEnd(partitions);
    }

    /**
     * Wrapper for Wakeup the consumer
     */
    @Override
    public void wakeup() {
        consumer.wakeup();
    }

    /**
     * Return the metrics kept by the consumer
     * @return metrics
     */
    @Override
    public Map<MetricName, ? extends Metric> metrics() {
        return consumer.metrics();
    }

    /**
     * Wrapper for close the consumer
     */
    @Override
    public void close() {
        consumer.close();
    }

    /**
     * Resume all the partitions
     */
    @Override
    public void resumeAllPartitions() {
        consumer.resume(Iterables.toArray(this.getPartitions(), TopicPartition.class));
    }

    /**
     * Return the list of partitions assigned to this consumer
     * @return list of partitions
     */
    @Override
    public Collection<TopicPartition> getPartitions() {
        return consumer.assignment();
    }

    /**
     * Resume the specified partition
     * @param tp partition
     */
    @Override
    public void resumePartition(TopicPartition tp) {
        consumer.resume(tp);
    }

    /**
     * Pause the specified partition
     * @param tp partition
     */
    @Override
    public void pausePartition(TopicPartition tp) {
        consumer.pause(tp);
    }

    /**
     * Return the offset of the next record that will be fetched
     * @param tp partition
     */
    @Override
    public long positionPartition(TopicPartition tp) {
        return consumer.position(tp);
    }
}