| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache license, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the license for the specific language governing permissions and |
| * limitations under the license. |
| */ |
| package org.apache.logging.log4j.util; |
| |
| import java.util.Stack; |
| |
| /** |
| * Internal utility to share a fast implementation of {@link #getCurrentStackTrace()} |
| * with the java 9 implementation of {@link StackLocator}. |
| */ |
| final class PrivateSecurityManagerStackTraceUtil { |
| |
| private static final PrivateSecurityManager SECURITY_MANAGER; |
| |
| static { |
| PrivateSecurityManager psm; |
| try { |
| final SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| sm.checkPermission(new RuntimePermission("createSecurityManager")); |
| } |
| psm = new PrivateSecurityManager(); |
| } catch (final SecurityException ignored) { |
| psm = null; |
| } |
| |
| SECURITY_MANAGER = psm; |
| } |
| |
| private PrivateSecurityManagerStackTraceUtil() { |
| // Utility Class |
| } |
| |
| static boolean isEnabled() { |
| return SECURITY_MANAGER != null; |
| } |
| |
| // benchmarks show that using the SecurityManager is much faster than looping through getCallerClass(int) |
| static Stack<Class<?>> getCurrentStackTrace() { |
| final Class<?>[] array = SECURITY_MANAGER.getClassContext(); |
| final Stack<Class<?>> classes = new Stack<>(); |
| classes.ensureCapacity(array.length); |
| for (final Class<?> clazz : array) { |
| classes.push(clazz); |
| } |
| return classes; |
| } |
| |
| private static final class PrivateSecurityManager extends SecurityManager { |
| |
| @Override |
| protected Class<?>[] getClassContext() { |
| return super.getClassContext(); |
| } |
| |
| } |
| } |