| /** |
| * 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.streaming; |
| |
| import java.io.*; |
| import java.net.InetAddress; |
| import java.util.*; |
| |
| import org.apache.hadoop.classification.InterfaceAudience; |
| import org.apache.hadoop.io.IOUtils; |
| |
| /** |
| * This is a class used to get the current environment |
| * on the host machines running the map/reduce. This class |
| * assumes that setting the environment in streaming is |
| * allowed on windows/ix/linuz/freebsd/sunos/solaris/hp-ux |
| */ |
| @InterfaceAudience.Private |
| public class Environment extends Properties { |
| |
| private static final long serialVersionUID = 1L; |
| |
| public Environment() throws IOException { |
| // Extend this code to fit all operating |
| // environments that you expect to run in |
| // http://lopica.sourceforge.net/os.html |
| String command = null; |
| String OS = System.getProperty("os.name"); |
| String lowerOs = OS.toLowerCase(); |
| if (OS.indexOf("Windows") > -1) { |
| command = "cmd /C set"; |
| } else if (lowerOs.indexOf("ix") > -1 || lowerOs.indexOf("linux") > -1 |
| || lowerOs.indexOf("freebsd") > -1 || lowerOs.indexOf("sunos") > -1 |
| || lowerOs.indexOf("solaris") > -1 || lowerOs.indexOf("hp-ux") > -1) { |
| command = "env"; |
| } else if (lowerOs.startsWith("mac os x") || lowerOs.startsWith("darwin")) { |
| command = "env"; |
| } else { |
| // Add others here |
| } |
| |
| if (command == null) { |
| throw new RuntimeException("Operating system " + OS + " not supported by this class"); |
| } |
| |
| // Read the environment variables |
| |
| Process pid = Runtime.getRuntime().exec(command); |
| BufferedReader in = new BufferedReader(new InputStreamReader(pid.getInputStream())); |
| try { |
| while (true) { |
| String line = in.readLine(); |
| if (line == null) |
| break; |
| int p = line.indexOf("="); |
| if (p != -1) { |
| String name = line.substring(0, p); |
| String value = line.substring(p + 1); |
| setProperty(name, value); |
| } |
| } |
| in.close(); |
| in = null; |
| } finally { |
| IOUtils.closeStream(in); |
| } |
| |
| try { |
| pid.waitFor(); |
| } catch (InterruptedException e) { |
| throw new IOException(e.getMessage()); |
| } |
| } |
| |
| // to be used with Runtime.exec(String[] cmdarray, String[] envp) |
| String[] toArray() { |
| String[] arr = new String[super.size()]; |
| Enumeration<Object> it = super.keys(); |
| int i = -1; |
| while (it.hasMoreElements()) { |
| String key = (String) it.nextElement(); |
| String val = (String) get(key); |
| i++; |
| arr[i] = key + "=" + val; |
| } |
| return arr; |
| } |
| |
| public Map<String, String> toMap() { |
| Map<String, String> map = new HashMap<String, String>(); |
| Enumeration<Object> it = super.keys(); |
| while (it.hasMoreElements()) { |
| String key = (String) it.nextElement(); |
| String val = (String) get(key); |
| map.put(key, val); |
| } |
| return map; |
| } |
| |
| public String getHost() { |
| String host = getProperty("HOST"); |
| if (host == null) { |
| // HOST isn't always in the environment |
| try { |
| host = InetAddress.getLocalHost().getHostName(); |
| } catch (IOException io) { |
| io.printStackTrace(); |
| } |
| } |
| return host; |
| } |
| |
| } |