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Integration between Apache Kafka and Jikkou

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/*
 * SPDX-License-Identifier: Apache-2.0
 * Copyright (c) The original authors
 *
 * Licensed under the Apache Software License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
 */
package io.streamthoughts.jikkou.kafka.internals;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
import org.apache.kafka.clients.admin.AdminClient;
import org.apache.kafka.clients.admin.AdminClientConfig;
import org.apache.kafka.clients.admin.TopicListing;
import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.Node;

/**
 * Reusable methods for Kafka.
 */
public final class KafkaUtils {

    public static CompletableFuture> listBrokers(final AdminClient client) {
        Objects.requireNonNull(client, "client cannot be null");
        return Futures.toCompletableFuture(client.describeCluster().nodes());
    }

    public static CompletableFuture> listTopics(final AdminClient client) {
        Objects.requireNonNull(client, "client cannot be null");
        return Futures.toCompletableFuture(client.listTopics().listings());
    }

    public static Map getAdminClientConfigs(final Map configs) {
        return getConfigsForKeys(configs, AdminClientConfig.configNames());
    }

    public static Map getProducerClientConfigs(final Map configs) {
        return getConfigsForKeys(configs, ProducerConfig.configNames());
    }

    public static Map getConsumerClientConfigs(final Map configs) {
        return getConfigsForKeys(configs, ConsumerConfig.configNames());
    }

    private static Map getConfigsForKeys(final Map configs,
                                                         final Set keys) {
        final Map parsed = new HashMap<>();
        for (final String configName : keys) {
            if (configs.containsKey(configName)) {
                parsed.put(configName, configs.get(configName));
            }
        }
        return parsed;
    }
}