kafka ClusterResourceListeners 源码
kafka ClusterResourceListeners 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/internals/ClusterResourceListeners.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.common.internals;
import org.apache.kafka.common.ClusterResource;
import org.apache.kafka.common.ClusterResourceListener;
import java.util.ArrayList;
import java.util.List;
public class ClusterResourceListeners {
private final List<ClusterResourceListener> clusterResourceListeners;
public ClusterResourceListeners() {
this.clusterResourceListeners = new ArrayList<>();
}
/**
* Add only if the candidate implements {@link ClusterResourceListener}.
* @param candidate Object which might implement {@link ClusterResourceListener}
*/
public void maybeAdd(Object candidate) {
if (candidate instanceof ClusterResourceListener) {
clusterResourceListeners.add((ClusterResourceListener) candidate);
}
}
/**
* Add all items who implement {@link ClusterResourceListener} from the list.
* @param candidateList List of objects which might implement {@link ClusterResourceListener}
*/
public void maybeAddAll(List<?> candidateList) {
for (Object candidate : candidateList) {
this.maybeAdd(candidate);
}
}
/**
* Send the updated cluster metadata to all {@link ClusterResourceListener}.
* @param cluster Cluster metadata
*/
public void onUpdate(ClusterResource cluster) {
for (ClusterResourceListener clusterResourceListener : clusterResourceListeners) {
clusterResourceListener.onUpdate(cluster);
}
}
}
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