kafka ListTopicsResult 源码
kafka ListTopicsResult 代码
文件路径：/clients/src/main/java/org/apache/kafka/clients/admin/ListTopicsResult.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 java.util.Collection;
import java.util.Map;
import java.util.Set;
/**
* The result of the {@link Admin#listTopics()} call.
*
* The API of this class is evolving, see {@link Admin} for details.
*/
@InterfaceStability.Evolving
public class ListTopicsResult {
final KafkaFuture<Map<String, TopicListing>> future;
ListTopicsResult(KafkaFuture<Map<String, TopicListing>> future) {
this.future = future;
}
/**
* Return a future which yields a map of topic names to TopicListing objects.
*/
public KafkaFuture<Map<String, TopicListing>> namesToListings() {
return future;
}
/**
* Return a future which yields a collection of TopicListing objects.
*/
public KafkaFuture<Collection<TopicListing>> listings() {
return future.thenApply(namesToDescriptions -> namesToDescriptions.values());
}
/**
* Return a future which yields a collection of topic names.
*/
public KafkaFuture<Set<String>> names() {
return future.thenApply(namesToListings -> namesToListings.keySet());
}
}
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