kafka AdminApiFuture 源码

  • 2022-10-20
  • 浏览 (543)

kafka AdminApiFuture 代码

文件路径:/clients/src/main/java/org/apache/kafka/clients/admin/internals/AdminApiFuture.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.kafka.clients.admin.internals;

import org.apache.kafka.common.KafkaFuture;
import org.apache.kafka.common.internals.KafkaFutureImpl;

import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;

public interface AdminApiFuture<K, V> {

    /**
     * The initial set of lookup keys. Although this will usually match the fulfillment
     * keys, it does not necessarily have to. For example, in the case of
     * {@link AllBrokersStrategy.AllBrokersFuture},
     * we use the lookup phase in order to discover the set of keys that will be searched
     * during the fulfillment phase.
     *
     * @return non-empty set of initial lookup keys
     */
    Set<K> lookupKeys();

    /**
     * Complete the futures associated with the given keys.
     *
     * @param values the completed keys with their respective values
     */
    void complete(Map<K, V> values);

    /**
     * Invoked when lookup of a set of keys succeeds.
     *
     * @param brokerIdMapping the discovered mapping from key to the respective brokerId that will
     *                        handle the fulfillment request
     */
    default void completeLookup(Map<K, Integer> brokerIdMapping) {
    }

    /**
     * Invoked when lookup fails with a fatal error on a set of keys.
     *
     * @param lookupErrors the set of keys that failed lookup with their respective errors
     */
    default void completeLookupExceptionally(Map<K, Throwable> lookupErrors) {
        completeExceptionally(lookupErrors);
    }

    /**
     * Complete the futures associated with the given keys exceptionally.
     *
     * @param errors the failed keys with their respective errors
     */
    void completeExceptionally(Map<K, Throwable> errors);

    static <K, V> SimpleAdminApiFuture<K, V> forKeys(Set<K> keys) {
        return new SimpleAdminApiFuture<>(keys);
    }

    /**
     * This class can be used when the set of keys is known ahead of time.
     */
    class SimpleAdminApiFuture<K, V> implements AdminApiFuture<K, V> {
        private final Map<K, KafkaFuture<V>> futures;

        public SimpleAdminApiFuture(Set<K> keys) {
            this.futures = keys.stream().collect(Collectors.toMap(
                Function.identity(),
                k -> new KafkaFutureImpl<>()
            ));
        }

        @Override
        public Set<K> lookupKeys() {
            return futures.keySet();
        }

        @Override
        public void complete(Map<K, V> values) {
            values.forEach(this::complete);
        }

        private void complete(K key, V value) {
            futureOrThrow(key).complete(value);
        }

        @Override
        public void completeExceptionally(Map<K, Throwable> errors) {
            errors.forEach(this::completeExceptionally);
        }

        private void completeExceptionally(K key, Throwable t) {
            futureOrThrow(key).completeExceptionally(t);
        }

        private KafkaFutureImpl<V> futureOrThrow(K key) {
            // The below typecast is safe because we initialise futures using only KafkaFutureImpl.
            KafkaFutureImpl<V> future = (KafkaFutureImpl<V>) futures.get(key);
            if (future == null) {
                throw new IllegalArgumentException("Attempt to complete future for " + key +
                    ", which was not requested");
            } else {
                return future;
            }
        }

        public Map<K, KafkaFuture<V>> all() {
            return futures;
        }

        public KafkaFuture<V> get(K key) {
            return futures.get(key);
        }
    }
}

相关信息

kafka 源码目录

相关文章

kafka AbortTransactionHandler 源码

kafka AdminApiDriver 源码

kafka AdminApiHandler 源码

kafka AdminApiLookupStrategy 源码

kafka AdminMetadataManager 源码

kafka AllBrokersStrategy 源码

kafka AlterConsumerGroupOffsetsHandler 源码

kafka ApiRequestScope 源码

kafka CoordinatorKey 源码

kafka CoordinatorStrategy 源码

0  赞