1 /*
2 * Copyright 2021 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 * Utility which ensures that classes are loaded by the {@link ClassLoader}.
20 */
21 public final class ClassInitializerUtil {
22
23 private ClassInitializerUtil() { }
24
25 /**
26 * Preload the given classes and so ensure the {@link ClassLoader} has these loaded after this method call.
27 *
28 * @param loadingClass the {@link Class} that wants to load the classes.
29 * @param classes the classes to load.
30 */
31 public static void tryLoadClasses(Class<?> loadingClass, Class<?>... classes) {
32 ClassLoader loader = PlatformDependent.getClassLoader(loadingClass);
33 for (Class<?> clazz: classes) {
34 tryLoadClass(loader, clazz.getName());
35 }
36 }
37
38 private static void tryLoadClass(ClassLoader classLoader, String className) {
39 try {
40 // Load the class and also ensure we init it which means its linked etc.
41 Class.forName(className, true, classLoader);
42 } catch (ClassNotFoundException ignore) {
43 // Ignore
44 } catch (SecurityException ignore) {
45 // Ignore
46 }
47 }
48 }