DF.java
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上传日期:2018-01-08
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- /**
- * 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.StringTokenizer;
- import org.apache.hadoop.conf.Configuration;
- 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;
-
- public DF(File path, Configuration conf) throws IOException {
- this(path, conf.getLong("dfs.df.interval", DF.DF_INTERVAL_DEFAULT));
- }
- public DF(File path, long dfInterval) throws IOException {
- super(dfInterval);
- this.dirPath = path.getCanonicalPath();
- }
-
- /// 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;
- }
- protected String[] getExecString() {
- // ignoring the error since the exit code it enough
- return new String[] {"bash","-c","exec 'df' '-k' '" + dirPath
- + "' 2>/dev/null"};
- }
-
- 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, " tnrf%");
-
- 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, " tnrf%");
- }
- 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();
- }
- 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());
- }
- }