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 * https://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 }