kafka DefaultReplicationPolicy 源码
kafka DefaultReplicationPolicy 代码
文件路径:/connect/mirror-client/src/main/java/org/apache/kafka/connect/mirror/DefaultReplicationPolicy.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.connect.mirror;
import org.apache.kafka.common.Configurable;
import java.util.Map;
import java.util.regex.Pattern;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** Defines remote topics like "us-west.topic1". The separator is customizable and defaults to a period. */
public class DefaultReplicationPolicy implements ReplicationPolicy, Configurable {
private static final Logger log = LoggerFactory.getLogger(DefaultReplicationPolicy.class);
// In order to work with various metrics stores, we allow custom separators.
public static final String SEPARATOR_CONFIG = MirrorClientConfig.REPLICATION_POLICY_SEPARATOR;
public static final String SEPARATOR_DEFAULT = ".";
private String separator = SEPARATOR_DEFAULT;
private Pattern separatorPattern = Pattern.compile(Pattern.quote(SEPARATOR_DEFAULT));
@Override
public void configure(Map<String, ?> props) {
if (props.containsKey(SEPARATOR_CONFIG)) {
separator = (String) props.get(SEPARATOR_CONFIG);
log.info("Using custom remote topic separator: '{}'", separator);
separatorPattern = Pattern.compile(Pattern.quote(separator));
}
}
@Override
public String formatRemoteTopic(String sourceClusterAlias, String topic) {
return sourceClusterAlias + separator + topic;
}
@Override
public String topicSource(String topic) {
String[] parts = separatorPattern.split(topic);
if (parts.length < 2) {
// this is not a remote topic
return null;
} else {
return parts[0];
}
}
@Override
public String upstreamTopic(String topic) {
String source = topicSource(topic);
if (source == null) {
return null;
} else {
return topic.substring(source.length() + separator.length());
}
}
private String internalSuffix() {
return separator + "internal";
}
private String checkpointsTopicSuffix() {
return separator + "checkpoints" + internalSuffix();
}
@Override
public String offsetSyncsTopic(String clusterAlias) {
return "mm2-offset-syncs" + separator + clusterAlias + internalSuffix();
}
@Override
public String checkpointsTopic(String clusterAlias) {
return clusterAlias + checkpointsTopicSuffix();
}
@Override
public boolean isCheckpointsTopic(String topic) {
return topic.endsWith(checkpointsTopicSuffix());
}
@Override
public boolean isMM2InternalTopic(String topic) {
return topic.endsWith(internalSuffix());
}
}
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