initial code repo

[stor4nfv.git] / src / ceph / src / java / java / com / ceph / fs / CephNativeLoader.java

diff --git a/src/ceph/src/java/java/com/ceph/fs/CephNativeLoader.java b/src/ceph/src/java/java/com/ceph/fs/CephNativeLoader.java
new file mode 100644 (file)
index 0000000..358ca24
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+++ b/src/ceph/src/java/java/com/ceph/fs/CephNativeLoader.java
@@ -0,0 +1,93 @@
+/*
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+package com.ceph.fs;
+
+class CephNativeLoader {
+  private static final CephNativeLoader instance = new CephNativeLoader();
+  private static boolean initialized = false;
+
+  private static final String JNI_PATH_ENV_VAR = "CEPH_JNI_PATH";
+  private static final String LIBRARY_NAME = "cephfs_jni";
+  private static final String LIBRARY_FILE = "libcephfs_jni.so";
+
+  private CephNativeLoader() {}
+
+  public static CephNativeLoader getInstance() {
+    return instance;
+  }
+
+  public synchronized void loadLibrary() {
+    if (initialized)
+      return;
+
+    boolean success = false;
+
+    /*
+     * Allow a Ceph specific environment variable to force
+     * the loading path.
+     */
+    String path = System.getenv(JNI_PATH_ENV_VAR);
+    try {
+      if (path != null) {
+        System.out.println("Loading libcephfs-jni: " + path);
+        System.load(path);
+        success = true;
+      } else {
+        try {
+          /*
+           * Try default Java loading path(s)
+           */
+          System.out.println("Loading libcephfs-jni from default path: " +
+              System.getProperty("java.library.path"));
+          System.loadLibrary(LIBRARY_NAME);
+          success = true;
+        } catch (final UnsatisfiedLinkError ule1) {
+          try {
+            /*
+             * Try RHEL/CentOS default path
+             */
+            path = "/usr/lib64/" + LIBRARY_FILE;
+            System.out.println("Loading libcephfs-jni: " + path);
+            System.load(path);
+            success = true;
+          } catch (final UnsatisfiedLinkError ule2) {
+            /*
+             * Try Ubuntu default path
+             */
+            path = "/usr/lib/jni/" + LIBRARY_FILE;
+            System.out.println("Loading libcephfs-jni: " + path);
+            System.load(path);
+            success = true;
+          }
+        }
+      }
+    } finally {
+      System.out.println("Loading libcephfs-jni: " +
+          (success ? "Success!" : "Failure!"));
+    }
+
+    /*
+     * Finish initialization
+     */
+    CephMount.native_initialize();
+    initialized = true;
+  }
+
+}