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Shaded Alluxio Client Module for hadoop 3
/*
* The Alluxio Open Foundation licenses this work under the Apache License, version 2.0
* (the "License"). You may not use this work except in alluxio.shaded.client.com.liance with the License, which is
* available at www.apache.alluxio.shaded.client.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.util;
import alluxio.Constants;
import java.alluxio.shaded.client.io.File;
import alluxio.shaded.client.javax.annotation.concurrent.ThreadSafe;
/**
* Utility functions for working with extensions.
*/
@ThreadSafe
public final class ExtensionUtils {
private static final File[] EMPTY_EXTENSIONS_LIST = new File[0];
/**
* List extension jars from the configured extensions directory.
*
* @param extensionDir the directory containing extensions
* @return an array of files (one file per jar)
*/
public static File[] listExtensions(String extensionDir) {
File[] extensions = new File(extensionDir)
.listFiles(file -> file.getPath().toLowerCase().endsWith(Constants.EXTENSION_JAR));
if (extensions == null) {
// Directory does not exist
return EMPTY_EXTENSIONS_LIST;
}
return extensions;
}
private ExtensionUtils() {} // prevent instantiation
}