87 lines
3.1 KiB
Java
87 lines
3.1 KiB
Java
/*
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* Copyright (c) 2014, 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.xml.internal.ws.developer;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.text.MessageFormat;
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import java.util.ResourceBundle;
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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 static final String FAILED_TO_CREATE_NEW_INSTANCE = "FAILED_TO_CREATE_NEW_INSTANCE";
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private WeakHashMap<ClassLoader, V> CACHE = new WeakHashMap<ClassLoader, V>();
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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(format(FAILED_TO_CREATE_NEW_INSTANCE, getClass().getName()), e);
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}
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}
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private static String format(String property, Object... args) {
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String text = ResourceBundle.getBundle(ContextClassloaderLocal.class.getName()).getString(property);
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return MessageFormat.format(text, args);
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}
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private static ClassLoader getContextClassLoader() {
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return (ClassLoader)
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AccessController.doPrivileged(new PrivilegedAction() {
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public Object 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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}
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