kafka WorkerConfigTransformer 源码
kafka WorkerConfigTransformer 代码
文件路径:/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerConfigTransformer.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.runtime;
import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.common.config.provider.ConfigProvider;
import org.apache.kafka.common.config.ConfigTransformer;
import org.apache.kafka.common.config.ConfigTransformerResult;
import org.apache.kafka.common.utils.Utils;
import org.apache.kafka.connect.runtime.Herder.ConfigReloadAction;
import org.apache.kafka.connect.util.Callback;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* A wrapper class to perform configuration transformations and schedule reloads for any
* retrieved TTL values.
*/
public class WorkerConfigTransformer implements AutoCloseable {
private static final Logger log = LoggerFactory.getLogger(WorkerConfigTransformer.class);
private final Worker worker;
private final ConfigTransformer configTransformer;
private final ConcurrentMap<String, Map<String, HerderRequest>> requests = new ConcurrentHashMap<>();
private final Map<String, ConfigProvider> configProviders;
public WorkerConfigTransformer(Worker worker, Map<String, ConfigProvider> configProviders) {
this.worker = worker;
this.configProviders = configProviders;
this.configTransformer = new ConfigTransformer(configProviders);
}
public Map<String, String> transform(Map<String, String> configs) {
return transform(null, configs);
}
public Map<String, String> transform(String connectorName, Map<String, String> configs) {
if (configs == null) return null;
ConfigTransformerResult result = configTransformer.transform(configs);
if (connectorName != null) {
String key = ConnectorConfig.CONFIG_RELOAD_ACTION_CONFIG;
String action = (String) ConfigDef.parseType(key, configs.get(key), ConfigDef.Type.STRING);
if (action == null) {
// The default action is "restart".
action = ConnectorConfig.CONFIG_RELOAD_ACTION_RESTART;
}
ConfigReloadAction reloadAction = ConfigReloadAction.valueOf(action.toUpperCase(Locale.ROOT));
if (reloadAction == ConfigReloadAction.RESTART) {
scheduleReload(connectorName, result.ttls());
}
}
return result.data();
}
private void scheduleReload(String connectorName, Map<String, Long> ttls) {
for (Map.Entry<String, Long> entry : ttls.entrySet()) {
scheduleReload(connectorName, entry.getKey(), entry.getValue());
}
}
private void scheduleReload(String connectorName, String path, long ttl) {
Map<String, HerderRequest> connectorRequests = requests.computeIfAbsent(connectorName, s -> new ConcurrentHashMap<>());
connectorRequests.compute(path, (s, previousRequest) -> {
if (previousRequest != null) {
// Delete previous request for ttl which is now stale
previousRequest.cancel();
}
log.info("Scheduling a restart of connector {} in {} ms", connectorName, ttl);
Callback<Void> cb = (error, result) -> {
if (error != null) {
log.error("Unexpected error during connector restart: ", error);
}
};
return worker.herder().restartConnector(ttl, connectorName, cb);
});
}
@Override
public void close() {
configProviders.values().forEach(x -> Utils.closeQuietly(x, "config provider"));
}
}
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