ceph/src/java/java/com/ceph/fs/CephNativeLoader.java

   1 /*
   2  * Permission is hereby granted, free of charge, to any person obtaining a
   3  * copy of this software and associated documentation files (the "Software"),
   4  * to deal in the Software without restriction, including without limitation
   5  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   6  * and/or sell copies of the Software, and to permit persons to whom the
   7  * Software is furnished to do so, subject to the following conditions:
   8  *
   9  * The above copyright notice and this permission notice shall be included in
  10  * all copies or substantial portions of the Software.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  14  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  15  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  16  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  17  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  18  * DEALINGS IN THE SOFTWARE.
  19  */
  20 package com.ceph.fs;
  21
  22 class CephNativeLoader {
  23   private static final CephNativeLoader instance = new CephNativeLoader();
  24   private static boolean initialized = false;
  25
  26   private static final String JNI_PATH_ENV_VAR = "CEPH_JNI_PATH";
  27   private static final String LIBRARY_NAME = "cephfs_jni";
  28   private static final String LIBRARY_FILE = "libcephfs_jni.so";
  29
  30   private CephNativeLoader() {}
  31
  32   public static CephNativeLoader getInstance() {
  33     return instance;
  34   }
  35
  36   public synchronized void loadLibrary() {
  37     if (initialized)
  38       return;
  39
  40     boolean success = false;
  41
  42     /*
  43      * Allow a Ceph specific environment variable to force
  44      * the loading path.
  45      */
  46     String path = System.getenv(JNI_PATH_ENV_VAR);
  47     try {
  48       if (path != null) {
  49         System.out.println("Loading libcephfs-jni: " + path);
  50         System.load(path);
  51         success = true;
  52       } else {
  53         try {
  54           /*
  55            * Try default Java loading path(s)
  56            */
  57           System.out.println("Loading libcephfs-jni from default path: " +
  58               System.getProperty("java.library.path"));
  59           System.loadLibrary(LIBRARY_NAME);
  60           success = true;
  61         } catch (final UnsatisfiedLinkError ule1) {
  62           try {
  63             /*
  64              * Try RHEL/CentOS default path
  65              */
  66             path = "/usr/lib64/" + LIBRARY_FILE;
  67             System.out.println("Loading libcephfs-jni: " + path);
  68             System.load(path);
  69             success = true;
  70           } catch (final UnsatisfiedLinkError ule2) {
  71             /*
  72              * Try Ubuntu default path
  73              */
  74             path = "/usr/lib/jni/" + LIBRARY_FILE;
  75             System.out.println("Loading libcephfs-jni: " + path);
  76             System.load(path);
  77             success = true;
  78           }
  79         }
  80       }
  81     } finally {
  82       System.out.println("Loading libcephfs-jni: " +
  83           (success ? "Success!" : "Failure!"));
  84     }
  85
  86     /*
  87      * Finish initialization
  88      */
  89     CephMount.native_initialize();
  90     initialized = true;
  91   }
  92
  93 }