kafka ClientQuotaDelta 源码
kafka ClientQuotaDelta 代码
文件路径：/metadata/src/main/java/org/apache/kafka/image/ClientQuotaDelta.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.ClientQuotaRecord;
import java.util.HashMap;
import java.util.Map;
import java.util.OptionalDouble;
import static java.util.Map.Entry;
public final class ClientQuotaDelta {
private final ClientQuotaImage image;
private final Map<String, OptionalDouble> changes = new HashMap<>();
public ClientQuotaDelta(ClientQuotaImage image) {
this.image = image;
}
public Map<String, OptionalDouble> changes() {
return changes;
}
public void finishSnapshot() {
for (String key : image.quotas().keySet()) {
if (!changes.containsKey(key)) {
// If a quota from the image did not appear in the snapshot, mark it as removed.
changes.put(key, OptionalDouble.empty());
}
}
}
public void replay(ClientQuotaRecord record) {
if (record.remove()) {
changes.put(record.key(), OptionalDouble.empty());
} else {
changes.put(record.key(), OptionalDouble.of(record.value()));
}
}
public ClientQuotaImage apply() {
Map<String, Double> newQuotas = new HashMap<>(image.quotas().size());
for (Entry<String, Double> entry : image.quotas().entrySet()) {
OptionalDouble change = changes.get(entry.getKey());
if (change == null) {
newQuotas.put(entry.getKey(), entry.getValue());
} else if (change.isPresent()) {
newQuotas.put(entry.getKey(), change.getAsDouble());
}
}
for (Entry<String, OptionalDouble> entry : changes.entrySet()) {
if (!newQuotas.containsKey(entry.getKey())) {
if (entry.getValue().isPresent()) {
newQuotas.put(entry.getKey(), entry.getValue().getAsDouble());
}
}
}
return new ClientQuotaImage(newQuotas);
}
}
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