author | aefimov |
Thu, 16 Feb 2017 13:14:39 +0300 | |
changeset 43852 | 93a527059d8a |
parent 25871 | b80b84e87032 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.tools.internal.ws.wsdl.parser; |
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import com.sun.tools.internal.ws.resources.ContextClassloaderLocalMessages; |
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import java.security.AccessController; |
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import java.security.PrivilegedAction; |
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import java.util.WeakHashMap; |
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/** |
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* Simple utility ensuring that the value is cached only in case it is non-internal implementation |
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*/ |
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abstract class ContextClassloaderLocal<V> { |
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private WeakHashMap<ClassLoader, V> CACHE = new WeakHashMap<>(); |
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public V get() throws Error { |
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ClassLoader tccl = getContextClassLoader(); |
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V instance = CACHE.get(tccl); |
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if (instance == null) { |
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instance = createNewInstance(); |
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CACHE.put(tccl, instance); |
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} |
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return instance; |
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} |
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public void set(V instance) { |
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CACHE.put(getContextClassLoader(), instance); |
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} |
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protected abstract V initialValue() throws Exception; |
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private V createNewInstance() { |
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try { |
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return initialValue(); |
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} catch (Exception e) { |
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throw new Error(ContextClassloaderLocalMessages.FAILED_TO_CREATE_NEW_INSTANCE(getClass().getName()), e); |
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} |
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} |
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private static ClassLoader getContextClassLoader() { |
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return AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() { |
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@Override |
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public ClassLoader run() { |
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ClassLoader cl = null; |
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try { |
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cl = Thread.currentThread().getContextClassLoader(); |
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} catch (SecurityException ex) { |
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} |
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return cl; |
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} |
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}); |
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} |
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} |