1 /*
2 * Copyright 2016 The Netty Project
3 *
4 * The Netty Project licenses this file to you under the Apache License,
5 * version 2.0 (the "License"); you may not use this file except in compliance
6 * with the License. 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, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations
14 * under the License.
15 */
16 package io.netty.util.internal;
17
18 /**
19 * A Utility to Call the {@link System#load(String)} or {@link System#loadLibrary(String)}.
20 * Because the {@link System#load(String)} and {@link System#loadLibrary(String)} are both
21 * CallerSensitive, it will load the native library into its caller's {@link ClassLoader}.
22 * In OSGi environment, we need this helper to delegate the calling to {@link System#load(String)}
23 * and it should be as simple as possible. It will be injected into the native library's
24 * ClassLoader when it is undefined. And therefore, when the defined new helper is invoked,
25 * the native library would be loaded into the native library's ClassLoader, not the
26 * caller's ClassLoader.
27 */
28 final class NativeLibraryUtil {
29 /**
30 * Delegate the calling to {@link System#load(String)} or {@link System#loadLibrary(String)}.
31 * @param libName - The native library path or name
32 * @param absolute - Whether the native library will be loaded by path or by name
33 */
34 public static void loadLibrary(String libName, boolean absolute) {
35 if (absolute) {
36 System.load(libName);
37 } else {
38 System.loadLibrary(libName);
39 }
40 }
41
42 private NativeLibraryUtil() {
43 // Utility
44 }
45 }