kafka CreateTopicsResult 源码
kafka CreateTopicsResult 代码
文件路径:/clients/src/main/java/org/apache/kafka/clients/admin/CreateTopicsResult.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.Uuid;
import org.apache.kafka.common.annotation.InterfaceStability;
import org.apache.kafka.common.errors.ApiException;
import java.util.Collection;
import java.util.Map;
import java.util.stream.Collectors;
/**
* The result of {@link Admin#createTopics(Collection)}.
*
* The API of this class is evolving, see {@link Admin} for details.
*/
@InterfaceStability.Evolving
public class CreateTopicsResult {
final static int UNKNOWN = -1;
private final Map<String, KafkaFuture<TopicMetadataAndConfig>> futures;
protected CreateTopicsResult(Map<String, KafkaFuture<TopicMetadataAndConfig>> futures) {
this.futures = futures;
}
/**
* Return a map from topic names to futures, which can be used to check the status of individual
* topic creations.
*/
public Map<String, KafkaFuture<Void>> values() {
return futures.entrySet().stream()
.collect(Collectors.toMap(Map.Entry::getKey, e -> e.getValue().thenApply(v -> (Void) null)));
}
/**
* Return a future which succeeds if all the topic creations succeed.
*/
public KafkaFuture<Void> all() {
return KafkaFuture.allOf(futures.values().toArray(new KafkaFuture[0]));
}
/**
* Returns a future that provides topic configs for the topic when the request completes.
* <p>
* If broker version doesn't support replication factor in the response, throw
* {@link org.apache.kafka.common.errors.UnsupportedVersionException}.
* If broker returned an error for topic configs, throw appropriate exception. For example,
* {@link org.apache.kafka.common.errors.TopicAuthorizationException} is thrown if user does not
* have permission to describe topic configs.
*/
public KafkaFuture<Config> config(String topic) {
return futures.get(topic).thenApply(TopicMetadataAndConfig::config);
}
/**
* Returns a future that provides topic ID for the topic when the request completes.
* <p>
* If broker version doesn't support replication factor in the response, throw
* {@link org.apache.kafka.common.errors.UnsupportedVersionException}.
* If broker returned an error for topic configs, throw appropriate exception. For example,
* {@link org.apache.kafka.common.errors.TopicAuthorizationException} is thrown if user does not
* have permission to describe topic configs.
*/
public KafkaFuture<Uuid> topicId(String topic) {
return futures.get(topic).thenApply(TopicMetadataAndConfig::topicId);
}
/**
* Returns a future that provides number of partitions in the topic when the request completes.
* <p>
* If broker version doesn't support replication factor in the response, throw
* {@link org.apache.kafka.common.errors.UnsupportedVersionException}.
* If broker returned an error for topic configs, throw appropriate exception. For example,
* {@link org.apache.kafka.common.errors.TopicAuthorizationException} is thrown if user does not
* have permission to describe topic configs.
*/
public KafkaFuture<Integer> numPartitions(String topic) {
return futures.get(topic).thenApply(TopicMetadataAndConfig::numPartitions);
}
/**
* Returns a future that provides replication factor for the topic when the request completes.
* <p>
* If broker version doesn't support replication factor in the response, throw
* {@link org.apache.kafka.common.errors.UnsupportedVersionException}.
* If broker returned an error for topic configs, throw appropriate exception. For example,
* {@link org.apache.kafka.common.errors.TopicAuthorizationException} is thrown if user does not
* have permission to describe topic configs.
*/
public KafkaFuture<Integer> replicationFactor(String topic) {
return futures.get(topic).thenApply(TopicMetadataAndConfig::replicationFactor);
}
public static class TopicMetadataAndConfig {
private final ApiException exception;
private final Uuid topicId;
private final int numPartitions;
private final int replicationFactor;
private final Config config;
public TopicMetadataAndConfig(Uuid topicId, int numPartitions, int replicationFactor, Config config) {
this.exception = null;
this.topicId = topicId;
this.numPartitions = numPartitions;
this.replicationFactor = replicationFactor;
this.config = config;
}
public TopicMetadataAndConfig(ApiException exception) {
this.exception = exception;
this.topicId = Uuid.ZERO_UUID;
this.numPartitions = UNKNOWN;
this.replicationFactor = UNKNOWN;
this.config = null;
}
public Uuid topicId() {
ensureSuccess();
return topicId;
}
public int numPartitions() {
ensureSuccess();
return numPartitions;
}
public int replicationFactor() {
ensureSuccess();
return replicationFactor;
}
public Config config() {
ensureSuccess();
return config;
}
private void ensureSuccess() {
if (exception != null)
throw exception;
}
}
}
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