kafka ListConsumerGroupsResult 源码

  • 2022-10-20
  • 浏览 (526)

kafka ListConsumerGroupsResult 代码

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

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

import java.util.ArrayList;
import java.util.Collection;

/**
 * The result of the {@link Admin#listConsumerGroups()} call.
 * <p>
 * The API of this class is evolving, see {@link Admin} for details.
 */
@InterfaceStability.Evolving
public class ListConsumerGroupsResult {
    private final KafkaFutureImpl<Collection<ConsumerGroupListing>> all;
    private final KafkaFutureImpl<Collection<ConsumerGroupListing>> valid;
    private final KafkaFutureImpl<Collection<Throwable>> errors;

    ListConsumerGroupsResult(KafkaFuture<Collection<Object>> future) {
        this.all = new KafkaFutureImpl<>();
        this.valid = new KafkaFutureImpl<>();
        this.errors = new KafkaFutureImpl<>();
        future.thenApply(new KafkaFuture.BaseFunction<Collection<Object>, Void>() {
            @Override
            public Void apply(Collection<Object> results) {
                ArrayList<Throwable> curErrors = new ArrayList<>();
                ArrayList<ConsumerGroupListing> curValid = new ArrayList<>();
                for (Object resultObject : results) {
                    if (resultObject instanceof Throwable) {
                        curErrors.add((Throwable) resultObject);
                    } else {
                        curValid.add((ConsumerGroupListing) resultObject);
                    }
                }
                if (!curErrors.isEmpty()) {
                    all.completeExceptionally(curErrors.get(0));
                } else {
                    all.complete(curValid);
                }
                valid.complete(curValid);
                errors.complete(curErrors);
                return null;
            }
        });
    }

    /**
     * Returns a future that yields either an exception, or the full set of consumer group
     * listings.
     *
     * In the event of a failure, the future yields nothing but the first exception which
     * occurred.
     */
    public KafkaFuture<Collection<ConsumerGroupListing>> all() {
        return all;
    }

    /**
     * Returns a future which yields just the valid listings.
     *
     * This future never fails with an error, no matter what happens.  Errors are completely
     * ignored.  If nothing can be fetched, an empty collection is yielded.
     * If there is an error, but some results can be returned, this future will yield
     * those partial results.  When using this future, it is a good idea to also check
     * the errors future so that errors can be displayed and handled.
     */
    public KafkaFuture<Collection<ConsumerGroupListing>> valid() {
        return valid;
    }

    /**
     * Returns a future which yields just the errors which occurred.
     *
     * If this future yields a non-empty collection, it is very likely that elements are
     * missing from the valid() set.
     *
     * This future itself never fails with an error.  In the event of an error, this future
     * will successfully yield a collection containing at least one exception.
     */
    public KafkaFuture<Collection<Throwable>> errors() {
        return errors;
    }
}

相关信息

kafka 源码目录

相关文章

kafka AbortTransactionOptions 源码

kafka AbortTransactionResult 源码

kafka AbortTransactionSpec 源码

kafka AbstractOptions 源码

kafka Admin 源码

kafka AdminClient 源码

kafka AdminClientConfig 源码

kafka AlterClientQuotasOptions 源码

kafka AlterClientQuotasResult 源码

kafka AlterConfigOp 源码

0  赞