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Java > Open Source Codes > org > objectweb > proactive > examples > c3d > Hosts


1 /*
2 * ################################################################
3 *
4 * ProActive: The Java(TM) library for Parallel, Distributed,
5 * Concurrent computing with Security and Mobility
6 *
7 * Copyright (C) 1997-2002 INRIA/University of Nice-Sophia Antipolis
8 * Contact: proactive-support@inria.fr
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this library; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
23 * USA
24 *
25 * Initial developer(s): The ProActive Team
26 * http://www.inria.fr/oasis/ProActive/contacts.html
27 * Contributor(s):
28 *
29 * ################################################################
30 */

31 package org.objectweb.proactive.examples.c3d;
32
33 class Hosts {
34
35   protected java.util.Vector JavaDoc allNodes = new java.util.Vector JavaDoc();
36   protected int index = 0;
37
38
39   public Hosts(String JavaDoc filename) throws java.io.IOException JavaDoc {
40     //System.out.println("Using host file " + filename);
41
java.io.File JavaDoc f = new java.io.File JavaDoc(filename);
42     if (f.canRead()) {
43       byte[] b = getBytesFromInputStream(new java.io.FileInputStream JavaDoc(f));
44       java.util.StringTokenizer JavaDoc tokenizer = new java.util.StringTokenizer JavaDoc(new String JavaDoc(b));
45       while (tokenizer.hasMoreTokens()) {
46         allNodes.addElement(tokenizer.nextToken());
47       }
48     }
49   }
50
51
52   public String JavaDoc getNextNode() {
53     // NodeLocator result;
54
String JavaDoc result;
55     result = (String JavaDoc)allNodes.elementAt(index);
56     index = (index + 1) % allNodes.size();
57     return result;
58   }
59
60
61   public int getMachines() {
62     return allNodes.size();
63   }
64
65
66   /**
67    * Returns an array of bytes containing the bytecodes for
68    * the class represented by the InputStream
69    * @param in the inputstream of the class file
70    * @return the bytecodes for the class
71    * @exception java.io.IOException if the class cannot be read
72    */

73   private static byte[] getBytesFromInputStream(java.io.InputStream JavaDoc in) throws java.io.IOException JavaDoc {
74     java.io.DataInputStream JavaDoc din = new java.io.DataInputStream JavaDoc(in);
75     byte[] bytecodes = new byte[in.available()];
76     try {
77       din.readFully(bytecodes);
78     } finally {
79       if (din != null) din.close();
80     }
81     return bytecodes;
82   }
83 }
84
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