/*

* 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;

}

}