kafka ApiVersions 源码
kafka ApiVersions 代码
文件路径：/clients/src/main/java/org/apache/kafka/clients/ApiVersions.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.clients;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.record.RecordBatch;
import org.apache.kafka.common.requests.ProduceRequest;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
/**
* Maintains node api versions for access outside of NetworkClient (which is where the information is derived).
* The pattern is akin to the use of {@link Metadata} for topic metadata.
*
* NOTE: This class is intended for INTERNAL usage only within Kafka.
*/
public class ApiVersions {
private final Map<String, NodeApiVersions> nodeApiVersions = new HashMap<>();
private byte maxUsableProduceMagic = RecordBatch.CURRENT_MAGIC_VALUE;
public synchronized void update(String nodeId, NodeApiVersions nodeApiVersions) {
this.nodeApiVersions.put(nodeId, nodeApiVersions);
this.maxUsableProduceMagic = computeMaxUsableProduceMagic();
}
public synchronized void remove(String nodeId) {
this.nodeApiVersions.remove(nodeId);
this.maxUsableProduceMagic = computeMaxUsableProduceMagic();
}
public synchronized NodeApiVersions get(String nodeId) {
return this.nodeApiVersions.get(nodeId);
}
private byte computeMaxUsableProduceMagic() {
// use a magic version which is supported by all brokers to reduce the chance that
// we will need to convert the messages when they are ready to be sent.
Optional<Byte> knownBrokerNodesMinRequiredMagicForProduce = this.nodeApiVersions.values().stream()
.filter(versions -> versions.apiVersion(ApiKeys.PRODUCE) != null) // filter out Raft controller nodes
.map(versions -> ProduceRequest.requiredMagicForVersion(versions.latestUsableVersion(ApiKeys.PRODUCE)))
.min(Byte::compare);
return (byte) Math.min(RecordBatch.CURRENT_MAGIC_VALUE,
knownBrokerNodesMinRequiredMagicForProduce.orElse(RecordBatch.CURRENT_MAGIC_VALUE));
}
public synchronized byte maxUsableProduceMagic() {
return maxUsableProduceMagic;
}
}
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