pulsar-client-kafka-compat/pulsar-client-kafka/src/main/java/org/apache/pulsar/client/kafka/compat/PulsarConsumerKafkaConfig.java

/**
 * 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.pulsar.client.kafka.compat;

import java.util.Arrays;
import java.util.Properties;
import java.util.concurrent.TimeUnit;
import static org.apache.pulsar.client.kafka.compat.PulsarProducerKafkaConfig.AUTO_UPDATE_PARTITIONS;
import static org.apache.pulsar.client.kafka.compat.PulsarProducerKafkaConfig.CRYPTO_READER_FACTORY_CLASS_NAME;
import org.apache.pulsar.client.api.ConsumerBuilder;
import org.apache.pulsar.client.api.PulsarClient;
import org.apache.pulsar.client.api.RegexSubscriptionMode;

public class PulsarConsumerKafkaConfig {

    /// Config variables
    public static final String CONSUMER_NAME = "pulsar.consumer.name";
    public static final String RECEIVER_QUEUE_SIZE = "pulsar.consumer.receiver.queue.size";
    public static final String ACKNOWLEDGEMENTS_GROUP_TIME_MILLIS = "pulsar.consumer.acknowledgments.group.time.millis";
    public static final String TOTAL_RECEIVER_QUEUE_SIZE_ACROSS_PARTITIONS = "pulsar.consumer.total.receiver.queue.size.across.partitions";
    public static final String SUBSCRIPTION_TOPICS_MODE = "pulsar.consumer.subscription.topics.mode";

    public static ConsumerBuilder<byte[]> getConsumerBuilder(PulsarClient client, Properties properties) {
        ConsumerBuilder<byte[]> consumerBuilder = client.newConsumer();

        if (properties.containsKey(CONSUMER_NAME)) {
            consumerBuilder.consumerName(properties.getProperty(CONSUMER_NAME));
        }

        if (properties.containsKey(RECEIVER_QUEUE_SIZE)) {
            consumerBuilder.receiverQueueSize(Integer.parseInt(properties.getProperty(RECEIVER_QUEUE_SIZE)));
        }

        if (properties.containsKey(TOTAL_RECEIVER_QUEUE_SIZE_ACROSS_PARTITIONS)) {
            consumerBuilder.maxTotalReceiverQueueSizeAcrossPartitions(
                    Integer.parseInt(properties.getProperty(TOTAL_RECEIVER_QUEUE_SIZE_ACROSS_PARTITIONS)));
        }

        if (properties.containsKey(ACKNOWLEDGEMENTS_GROUP_TIME_MILLIS)) {
            consumerBuilder.acknowledgmentGroupTime(
                    Long.parseLong(properties.getProperty(ACKNOWLEDGEMENTS_GROUP_TIME_MILLIS)), TimeUnit.MILLISECONDS);
        }

        if (properties.containsKey(SUBSCRIPTION_TOPICS_MODE)) {
            RegexSubscriptionMode mode;
            try {
                mode = RegexSubscriptionMode.valueOf(properties.getProperty(SUBSCRIPTION_TOPICS_MODE));
            } catch (IllegalArgumentException e) {
                throw new IllegalArgumentException("Illegal subscription mode, valid values are: "
                    + Arrays.asList(RegexSubscriptionMode.values()));
            }
            consumerBuilder.subscriptionTopicsMode(mode);
        }

        if (properties.containsKey(AUTO_UPDATE_PARTITIONS)) {
            consumerBuilder.autoUpdatePartitions(Boolean.parseBoolean(properties.getProperty(AUTO_UPDATE_PARTITIONS)));
        }
        
        if (properties.containsKey(CRYPTO_READER_FACTORY_CLASS_NAME)) {
            try {
                CryptoKeyReaderFactory cryptoReaderFactory = (CryptoKeyReaderFactory) Class
                        .forName(properties.getProperty(CRYPTO_READER_FACTORY_CLASS_NAME)).newInstance();
                consumerBuilder.cryptoKeyReader(cryptoReaderFactory.create(properties));
            } catch (Exception e) {
                throw new IllegalArgumentException("Failed to create crypto reader using factory "
                        + properties.getProperty(CRYPTO_READER_FACTORY_CLASS_NAME), e);
            }
        }
        return consumerBuilder;
    }
}