kafka ManualMetadataUpdater 源码
kafka ManualMetadataUpdater 代码
文件路径：/clients/src/main/java/org/apache/kafka/clients/ManualMetadataUpdater.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.KafkaException;
import org.apache.kafka.common.Node;
import org.apache.kafka.common.errors.AuthenticationException;
import org.apache.kafka.common.requests.MetadataResponse;
import org.apache.kafka.common.requests.RequestHeader;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
/**
* A simple implementation of `MetadataUpdater` that returns the cluster nodes set via the constructor or via
* `setNodes`.
*
* This is useful in cases where automatic metadata updates are not required. An example is controller/broker
* communication.
*
* This class is not thread-safe!
*/
public class ManualMetadataUpdater implements MetadataUpdater {
private List<Node> nodes;
public ManualMetadataUpdater() {
this(new ArrayList<>(0));
}
public ManualMetadataUpdater(List<Node> nodes) {
this.nodes = nodes;
}
public void setNodes(List<Node> nodes) {
this.nodes = nodes;
}
@Override
public List<Node> fetchNodes() {
return new ArrayList<>(nodes);
}
@Override
public boolean isUpdateDue(long now) {
return false;
}
@Override
public long maybeUpdate(long now) {
return Long.MAX_VALUE;
}
@Override
public void handleServerDisconnect(long now, String nodeId, Optional<AuthenticationException> maybeAuthException) {
// We don't fail the broker on failures. There should be sufficient information from
// the NetworkClient logs to indicate the reason for the failure.
}
@Override
public void handleFailedRequest(long now, Optional<KafkaException> maybeFatalException) {
// Do nothing
}
@Override
public void handleSuccessfulResponse(RequestHeader requestHeader, long now, MetadataResponse response) {
// Do nothing
}
@Override
public void close() {
}
}
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