kafka ConfigurationDelta 源码
kafka ConfigurationDelta 代码
文件路径：/metadata/src/main/java/org/apache/kafka/image/ConfigurationDelta.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.image;
import org.apache.kafka.common.metadata.ConfigRecord;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
/**
* Represents changes to the configurations in the metadata image.
*/
public final class ConfigurationDelta {
private final ConfigurationImage image;
private final Map<String, Optional<String>> changes = new HashMap<>();
public ConfigurationDelta(ConfigurationImage image) {
this.image = image;
}
public void finishSnapshot() {
for (String key : image.data().keySet()) {
if (!changes.containsKey(key)) {
changes.put(key, Optional.empty());
}
}
}
public void replay(ConfigRecord record) {
changes.put(record.name(), Optional.ofNullable(record.value()));
}
public void deleteAll() {
changes.clear();
for (String key : image.data().keySet()) {
changes.put(key, Optional.empty());
}
}
public ConfigurationImage apply() {
Map<String, String> newData = new HashMap<>(image.data().size());
for (Entry<String, String> entry : image.data().entrySet()) {
Optional<String> change = changes.get(entry.getKey());
if (change == null) {
newData.put(entry.getKey(), entry.getValue());
} else if (change.isPresent()) {
newData.put(entry.getKey(), change.get());
}
}
for (Entry<String, Optional<String>> entry : changes.entrySet()) {
if (!newData.containsKey(entry.getKey())) {
if (entry.getValue().isPresent()) {
newData.put(entry.getKey(), entry.getValue().get());
}
}
}
return new ConfigurationImage(newData);
}
@Override
public String toString() {
// Values are intentionally left out of this so that sensitive configs
// do not end up in logging by mistake.
return "ConfigurationDelta(" +
"changedKeys=" + changes.keySet() +
')';
}
}
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