| /** |
| * 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.fs; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.BufferedReader; |
| |
| import java.util.EnumSet; |
| import java.util.StringTokenizer; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.fs.CommonConfigurationKeys; |
| import org.apache.hadoop.util.Shell; |
| |
| /** Filesystem disk space usage statistics. Uses the unix 'df' program. |
| * Tested on Linux, FreeBSD, Cygwin. */ |
| public class DF extends Shell { |
| public static final long DF_INTERVAL_DEFAULT = 3 * 1000; // default DF refresh interval |
| |
| private String dirPath; |
| private String filesystem; |
| private long capacity; |
| private long used; |
| private long available; |
| private int percentUsed; |
| private String mount; |
| |
| enum OSType { |
| OS_TYPE_UNIX("UNIX"), |
| OS_TYPE_WIN("Windows"), |
| OS_TYPE_SOLARIS("SunOS"), |
| OS_TYPE_MAC("Mac"), |
| OS_TYPE_AIX("AIX"); |
| |
| private String id; |
| OSType(String id) { |
| this.id = id; |
| } |
| public boolean match(String osStr) { |
| return osStr != null && osStr.indexOf(id) >= 0; |
| } |
| String getId() { |
| return id; |
| } |
| } |
| |
| private static final String OS_NAME = System.getProperty("os.name"); |
| private static final OSType OS_TYPE = getOSType(OS_NAME); |
| |
| protected static OSType getOSType(String osName) { |
| for (OSType ost : EnumSet.allOf(OSType.class)) { |
| if (ost.match(osName)) { |
| return ost; |
| } |
| } |
| return OSType.OS_TYPE_UNIX; |
| } |
| |
| public DF(File path, Configuration conf) throws IOException { |
| this(path, conf.getLong(CommonConfigurationKeys.FS_DF_INTERVAL_KEY, DF.DF_INTERVAL_DEFAULT)); |
| } |
| |
| public DF(File path, long dfInterval) throws IOException { |
| super(dfInterval); |
| this.dirPath = path.getCanonicalPath(); |
| } |
| |
| protected OSType getOSType() { |
| return OS_TYPE; |
| } |
| |
| /// ACCESSORS |
| |
| public String getDirPath() { |
| return dirPath; |
| } |
| |
| public String getFilesystem() throws IOException { |
| run(); |
| return filesystem; |
| } |
| |
| public long getCapacity() throws IOException { |
| run(); |
| return capacity; |
| } |
| |
| public long getUsed() throws IOException { |
| run(); |
| return used; |
| } |
| |
| public long getAvailable() throws IOException { |
| run(); |
| return available; |
| } |
| |
| public int getPercentUsed() throws IOException { |
| run(); |
| return percentUsed; |
| } |
| |
| public String getMount() throws IOException { |
| run(); |
| return mount; |
| } |
| |
| public String toString() { |
| return |
| "df -k " + mount +"\n" + |
| filesystem + "\t" + |
| capacity / 1024 + "\t" + |
| used / 1024 + "\t" + |
| available / 1024 + "\t" + |
| percentUsed + "%\t" + |
| mount; |
| } |
| |
| @Override |
| protected String[] getExecString() { |
| // ignoring the error since the exit code it enough |
| return new String[] {"bash","-c","exec 'df' '-k' '" + dirPath |
| + "' 2>/dev/null"}; |
| } |
| |
| @Override |
| protected void parseExecResult(BufferedReader lines) throws IOException { |
| lines.readLine(); // skip headings |
| |
| String line = lines.readLine(); |
| if (line == null) { |
| throw new IOException( "Expecting a line not the end of stream" ); |
| } |
| StringTokenizer tokens = |
| new StringTokenizer(line, " \t\n\r\f%"); |
| |
| this.filesystem = tokens.nextToken(); |
| if (!tokens.hasMoreTokens()) { // for long filesystem name |
| line = lines.readLine(); |
| if (line == null) { |
| throw new IOException( "Expecting a line not the end of stream" ); |
| } |
| tokens = new StringTokenizer(line, " \t\n\r\f%"); |
| } |
| |
| switch(getOSType()) { |
| case OS_TYPE_AIX: |
| this.capacity = Long.parseLong(tokens.nextToken()) * 1024; |
| this.available = Long.parseLong(tokens.nextToken()) * 1024; |
| this.percentUsed = Integer.parseInt(tokens.nextToken()); |
| tokens.nextToken(); |
| tokens.nextToken(); |
| this.mount = tokens.nextToken(); |
| this.used = this.capacity - this.available; |
| break; |
| |
| case OS_TYPE_WIN: |
| case OS_TYPE_SOLARIS: |
| case OS_TYPE_MAC: |
| case OS_TYPE_UNIX: |
| default: |
| this.capacity = Long.parseLong(tokens.nextToken()) * 1024; |
| this.used = Long.parseLong(tokens.nextToken()) * 1024; |
| this.available = Long.parseLong(tokens.nextToken()) * 1024; |
| this.percentUsed = Integer.parseInt(tokens.nextToken()); |
| this.mount = tokens.nextToken(); |
| break; |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| String path = "."; |
| if (args.length > 0) |
| path = args[0]; |
| |
| System.out.println(new DF(new File(path), DF_INTERVAL_DEFAULT).toString()); |
| } |
| } |