| /* |
| * Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package com.sun.tools.internal.ws.wsdl.parser; |
| |
| import com.sun.tools.internal.ws.resources.ContextClassloaderLocalMessages; |
| |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| import java.util.WeakHashMap; |
| |
| /** |
| * Simple utility ensuring that the value is cached only in case it is non-internal implementation |
| */ |
| abstract class ContextClassloaderLocal<V> { |
| |
| private WeakHashMap<ClassLoader, V> CACHE = new WeakHashMap<>(); |
| |
| public V get() throws Error { |
| ClassLoader tccl = getContextClassLoader(); |
| V instance = CACHE.get(tccl); |
| if (instance == null) { |
| instance = createNewInstance(); |
| CACHE.put(tccl, instance); |
| } |
| return instance; |
| } |
| |
| public void set(V instance) { |
| CACHE.put(getContextClassLoader(), instance); |
| } |
| |
| protected abstract V initialValue() throws Exception; |
| |
| private V createNewInstance() { |
| try { |
| return initialValue(); |
| } catch (Exception e) { |
| throw new Error(ContextClassloaderLocalMessages.FAILED_TO_CREATE_NEW_INSTANCE(getClass().getName()), e); |
| } |
| } |
| |
| private static ClassLoader getContextClassLoader() { |
| return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() { |
| @Override |
| public ClassLoader run() { |
| ClassLoader cl = null; |
| try { |
| cl = Thread.currentThread().getContextClassLoader(); |
| } catch (SecurityException ex) { |
| } |
| return cl; |
| } |
| }); |
| } |
| } |