hadoop VolumeStates 源码
haddop VolumeStates 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/volume/csi/VolumeStates.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.hadoop.yarn.server.resourcemanager.volume.csi;
import org.apache.hadoop.yarn.server.resourcemanager.volume.csi.lifecycle.Volume;
import org.apache.hadoop.yarn.server.volume.csi.VolumeId;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Volume manager states, including all managed volumes and their states.
*/
public class VolumeStates {
private final Map<VolumeId, Volume> volumeStates;
public VolumeStates() {
this.volumeStates = new ConcurrentHashMap<>();
}
public Volume getVolume(VolumeId volumeId) {
return volumeStates.get(volumeId);
}
/**
* Add volume if it is not yet added.
* If a new volume is added with a same {@link VolumeId}
* with a existing volume, existing volume will be returned.
* @param volume volume to add
* @return volume added or existing volume
*/
public Volume addVolumeIfAbsent(Volume volume) {
if (volume.getVolumeId() != null) {
return volumeStates.putIfAbsent(volume.getVolumeId(), volume);
} else {
// for dynamical provisioned volumes,
// the volume ID might not be available at time being.
// we can makeup one with the combination of driver+volumeName+timestamp
// once the volume ID is generated, we should replace ID.
return volume;
}
}
}
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