PerformanceMonitor


1   /*******************************************************************************
2    * Copyright (c) 2003, 2004 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.perfmsr.core;
12  
13  
14  /**
15   * Some natives for PerformanceMonitorWindows.
16   * (We cannot fold them into the PerformanceMonitorWindows because this would break the natives
17   * and we don't want to rebuild them yet).
18   */
19  public class PerformanceMonitor {
20          
21      /** 
22       * ivjperf - name of the library that implements the native methods.
23       */
24      private static final String   NATIVE_LIBRARY_NAME= "ivjperf"; //$NON-NLS-1$
25      
26      /**
27       * Is the native library loaded? 0-don't know, 1-no, 2-yes
28       */
29      private static int fgIsLoaded= 0;
30      
31      /**
32       * Answer true if the native library for this class has been successfully
33       * loaded. If the load has not been attempted yet, try to load it.
34       * @return true if native library has been successfully loaded
35       */
36      public static boolean isLoaded() {
37          if (fgIsLoaded == 0) {
38              try {
39                  System.loadLibrary(NATIVE_LIBRARY_NAME);
40                  fgIsLoaded= 2;
41              } catch (Throwable   e) {
42                  e.printStackTrace();
43                  fgIsLoaded= 1;
44              }
45          }
46          return fgIsLoaded == 2;
47      }
48      
49      /**
50       * Calls the Windows GetPerformanceInfo function
51       * @param counters any array of counters that corresponds to the Windows
52       * PERFORMANCE_INFORMATION structure.
53       */
54      public static native void nativeGetPerformanceInfo(long[] counters);
55      
56      public static native boolean nativeGetPerformanceCounters(long[] counters);
57      
58      public static native String   nativeGetUUID();
59  }
60
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