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1   /**
2    *  Copyright 2003-2006 Greg Luck
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License");
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License.
15   */
16  
17  package net.sf.ehcache.distribution;
18  
19  /**
20   * A utility class for distributed tests
21   *
22   * @author Greg Luck
23   * @version $Id: JVMUtil.java 51 2006-04-24 09:21:10Z gregluck $
24   */
25  public final class JVMUtil {
26      private static final float JDK_1_5 = 1.5f;
27      private static final int FIRST_THREE_CHARS = 3;
28  
29      /**
30       * Utility class. No constructor
31       */
32      private JVMUtil() {
33          //noop
34      }
35  
36  
37      /**
38       * JDK Bug Id 4267864 affecting JDKs limits the number of RMI registries to one per virtual
39       * machine. Because tests rely on creating multiple they will only work on JDK1.5.
40       *
41       * This method is used to not run the affected tests on JDK1.4.
42       * @return true if the JDK is limited to one RMI Registry per VM, else false
43       */
44      public static boolean isSingleRMIRegistryPerVM() {
45          String version = System.getProperty("java.version");
46          String majorVersion = version.substring(0, FIRST_THREE_CHARS);
47          float majorVersionFloat = Float.parseFloat(majorVersion);
48          return majorVersionFloat < JDK_1_5;
49      }
50  
51  
52      /**
53       * Some performance numbers and size limits are higher in 15.
54       * This is used to set the tests as high as possible for each VM.
55       * @return true if JDK1.5 or higher
56       */
57      public static boolean isJDK15() {
58          return !isSingleRMIRegistryPerVM();
59      }
60  }