kafka Topic 源码
kafka Topic 代码
文件路径:/clients/src/main/java/org/apache/kafka/common/internals/Topic.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.common.internals;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.errors.InvalidTopicException;
import org.apache.kafka.common.utils.Utils;
import java.util.Collections;
import java.util.Set;
import java.util.function.Consumer;
public class Topic {
public static final String GROUP_METADATA_TOPIC_NAME = "__consumer_offsets";
public static final String TRANSACTION_STATE_TOPIC_NAME = "__transaction_state";
public static final String METADATA_TOPIC_NAME = "__cluster_metadata";
public static final TopicPartition METADATA_TOPIC_PARTITION = new TopicPartition(METADATA_TOPIC_NAME, 0);
public static final String LEGAL_CHARS = "[a-zA-Z0-9._-]";
private static final Set<String> INTERNAL_TOPICS = Collections.unmodifiableSet(
Utils.mkSet(GROUP_METADATA_TOPIC_NAME, TRANSACTION_STATE_TOPIC_NAME));
private static final int MAX_NAME_LENGTH = 249;
public static void validate(String topic) {
validate(topic, "Topic name", message -> {
throw new InvalidTopicException(message);
});
}
private static String detectInvalidTopic(String name) {
if (name.isEmpty())
return "the empty string is not allowed";
if (".".equals(name))
return "'.' is not allowed";
if ("..".equals(name))
return "'..' is not allowed";
if (name.length() > MAX_NAME_LENGTH)
return "the length of '" + name + "' is longer than the max allowed length " + MAX_NAME_LENGTH;
if (!containsValidPattern(name))
return "'" + name + "' contains one or more characters other than " +
"ASCII alphanumerics, '.', '_' and '-'";
return null;
}
public static boolean isValid(String name) {
String reasonInvalid = detectInvalidTopic(name);
return reasonInvalid == null;
}
public static void validate(String name, String logPrefix, Consumer<String> throwableConsumer) {
String reasonInvalid = detectInvalidTopic(name);
if (reasonInvalid != null) {
throwableConsumer.accept(logPrefix + " is invalid: " + reasonInvalid);
}
}
public static boolean isInternal(String topic) {
return INTERNAL_TOPICS.contains(topic);
}
/**
* Due to limitations in metric names, topics with a period ('.') or underscore ('_') could collide.
*
* @param topic The topic to check for colliding character
* @return true if the topic has collision characters
*/
public static boolean hasCollisionChars(String topic) {
return topic.contains("_") || topic.contains(".");
}
/**
* Unify topic name with a period ('.') or underscore ('_'), this is only used to check collision and will not
* be used to really change topic name.
*
* @param topic A topic to unify
* @return A unified topic name
*/
public static String unifyCollisionChars(String topic) {
return topic.replace('.', '_');
}
/**
* Returns true if the topicNames collide due to a period ('.') or underscore ('_') in the same position.
*
* @param topicA A topic to check for collision
* @param topicB A topic to check for collision
* @return true if the topics collide
*/
public static boolean hasCollision(String topicA, String topicB) {
return unifyCollisionChars(topicA).equals(unifyCollisionChars(topicB));
}
/**
* Valid characters for Kafka topics are the ASCII alphanumerics, '.', '_', and '-'
*/
static boolean containsValidPattern(String topic) {
for (int i = 0; i < topic.length(); ++i) {
char c = topic.charAt(i);
// We don't use Character.isLetterOrDigit(c) because it's slower
boolean validChar = (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || c == '.' ||
c == '_' || c == '-';
if (!validChar)
return false;
}
return true;
}
}
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