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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.netty5.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  }