hadoop FsVolumeImplBuilder 源码
haddop FsVolumeImplBuilder 代码
文件路径：/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsVolumeImplBuilder.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.hdfs.server.datanode.fsdataset.impl;
import java.io.IOException;
import org.apache.hadoop.classification.VisibleForTesting;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.DF;
import org.apache.hadoop.fs.StorageType;
import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
import org.apache.hadoop.hdfs.server.datanode.FileIoProvider;
/**
* This class is to be used as a builder for {@link FsVolumeImpl} objects.
*/
public class FsVolumeImplBuilder {
private FsDatasetImpl dataset;
private String storageID;
private StorageDirectory sd;
private Configuration conf;
private FileIoProvider fileIoProvider;
private DF usage;
public FsVolumeImplBuilder() {
dataset = null;
storageID = null;
sd = null;
conf = null;
usage = null;
}
FsVolumeImplBuilder setDataset(FsDatasetImpl dataset) {
this.dataset = dataset;
return this;
}
FsVolumeImplBuilder setStorageID(String id) {
this.storageID = id;
return this;
}
FsVolumeImplBuilder setStorageDirectory(StorageDirectory sd) {
this.sd = sd;
return this;
}
FsVolumeImplBuilder setConf(Configuration conf) {
this.conf = conf;
return this;
}
FsVolumeImplBuilder setFileIoProvider(FileIoProvider fileIoProvider) {
this.fileIoProvider = fileIoProvider;
return this;
}
@VisibleForTesting
FsVolumeImplBuilder setUsage(DF newUsage) {
this.usage = newUsage;
return this;
}
FsVolumeImpl build() throws IOException {
if (sd.getStorageLocation().getStorageType() == StorageType.PROVIDED) {
return new ProvidedVolumeImpl(dataset, storageID, sd,
fileIoProvider != null ? fileIoProvider :
new FileIoProvider(null, null), conf);
}
if (null == usage) {
// set usage unless overridden by unit tests
usage = new DF(sd.getCurrentDir().getParentFile(), conf);
}
return new FsVolumeImpl(
dataset, storageID, sd,
fileIoProvider != null ? fileIoProvider :
new FileIoProvider(null, null), conf, usage);
}
}
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