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Tencent Cloud cosn Under File System implementation

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/*
 * The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
 * (the "License"). You may not use this work except in compliance with the License, which is
 * available at www.apache.org/licenses/LICENSE-2.0
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied, as more fully set forth in the License.
 *
 * See the NOTICE file distributed with this work for information regarding copyright ownership.
 */

package alluxio.underfs.cosn;

import alluxio.AlluxioURI;
import alluxio.underfs.UnderFileSystem;
import alluxio.underfs.UnderFileSystemConfiguration;
import alluxio.underfs.hdfs.HdfsUnderFileSystem;

import org.apache.hadoop.conf.Configuration;

import javax.annotation.concurrent.ThreadSafe;

/**
 * COSN {@link UnderFileSystem} implementation.
 */
@ThreadSafe
public class CosnUnderFileSystem extends HdfsUnderFileSystem {

  /**
   * Factory method to constructs a new Cosn {@link UnderFileSystem} instance.
   *
   * @param ufsUri the {@link AlluxioURI} for this UFS
   * @param conf the configuration for Hadoop
   * @return a new Cosn {@link UnderFileSystem} instance
   */
  public static CosnUnderFileSystem createInstance(AlluxioURI ufsUri,
      UnderFileSystemConfiguration conf) {
    Configuration hdfsConf = createConfiguration(conf);
    return new CosnUnderFileSystem(ufsUri, conf, hdfsConf);
  }

  /**
   * Constructs a new COSN {@link UnderFileSystem}.
   *
   * @param ufsUri the {@link AlluxioURI} for this UFS
   * @param conf the configuration for this UFS
   * @param hdfsConf the configuration for COSN
   */
  public CosnUnderFileSystem(AlluxioURI ufsUri, UnderFileSystemConfiguration conf,
      Configuration hdfsConf) {
    super(ufsUri, conf, hdfsConf);
  }

  @Override
  public String getUnderFSType() {
    return "cosn";
  }
}