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Kafka on Pulsar implemented using Pulsar Protocol Handler

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/**
 * Copyright (c) 2019 - 2024 StreamNative, Inc.. 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.
 */
package io.streamnative.pulsar.handlers.kop;

import static org.apache.kafka.common.requests.MetadataResponse.PartitionMetadata;
import static org.apache.kafka.common.requests.MetadataResponse.TopicMetadata;

import io.streamnative.pulsar.handlers.kop.utils.CoreUtils;
import io.streamnative.pulsar.handlers.kop.utils.KopTopic;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.function.Function;
import java.util.stream.IntStream;
import org.apache.kafka.common.protocol.Errors;
import org.apache.pulsar.common.naming.TopicName;

/**
 * The topic and its metadata (number of partitions or the error).
 */
public record TopicAndMetadata(String kafkaTopic, String pulsarTopic/* without partition suffix */,
                               int numPartitions, Errors error) {

    public boolean hasNoError() {
        return error == Errors.NONE;
    }

    public CompletableFuture lookupAsync(
        final Function> lookupFunction,
        final String metadataNamespace) {
        if (numPartitions > 0) {
            return CoreUtils.waitForAll(IntStream.range(0, numPartitions).mapToObj(partition ->
                lookupFunction.apply(pulsarTopic + TopicName.PARTITIONED_TOPIC_SUFFIX + partition)
            ).toList(), partitionMetadataList -> toTopicMetadata(metadataNamespace, partitionMetadataList));
        } else {
            return lookupFunction.apply(pulsarTopic).thenApply(partitionMetadata ->
                toTopicMetadata(metadataNamespace, Collections.singletonList(partitionMetadata)));
        }
    }

    private TopicMetadata toTopicMetadata(final String metadataNamespace,
                                          final List partitionMetadata) {
        return new TopicMetadata(error, kafkaTopic, KopTopic.isInternalTopic(pulsarTopic, metadataNamespace),
            partitionMetadata);
    }

    public TopicMetadata toTopicMetadata(final String metadataNamespace) {
        return toTopicMetadata(metadataNamespace, Collections.emptyList());
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof TopicAndMetadata other)) {
            return false;
        }
        return kafkaTopic.equals(other.kafkaTopic) && pulsarTopic.equals(other.pulsarTopic)
            && numPartitions == other.numPartitions && error == other.error;
    }
}