com.liferay.portal.kernel.util.ClearThreadLocalUtil Maven / Gradle / Ivy
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Contains interfaces for the portal services. Interfaces are only loaded by the global class loader and are shared by all plugins.
/**
* Copyright (c) 2000-2013 Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library 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 Lesser General Public License for more
* details.
*/
package com.liferay.portal.kernel.util;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import java.lang.ref.Reference;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
/**
* @author Tina Tian
*/
public class ClearThreadLocalUtil {
public static void clearThreadLocal() throws Exception {
if (!_initialized) {
return;
}
Thread[] threads = ThreadUtil.getThreads();
Thread currentThread = Thread.currentThread();
ClassLoader contextClassLoader = currentThread.getContextClassLoader();
for (Thread thread : threads) {
_clearThreadLocal(thread, contextClassLoader);
}
}
private static void _clearThreadLocal(
Thread thread, ClassLoader classLoader)
throws Exception {
if (thread == null) {
return;
}
Object threadLocalMap = _threadLocalsField.get(thread);
Object inheritableThreadLocalMap = _inheritableThreadLocalsField.get(
thread);
_clearThreadLocalMap(threadLocalMap, classLoader);
_clearThreadLocalMap(inheritableThreadLocalMap, classLoader);
}
private static void _clearThreadLocalMap(
Object threadLocalMap, ClassLoader classLoader)
throws Exception {
if (threadLocalMap == null) {
return;
}
Object[] table = (Object[])_tableField.get(threadLocalMap);
if (table == null) {
return;
}
int staleEntriesCount = 0;
for (Object tableEntry : table) {
if (tableEntry == null) {
continue;
}
Object key = ((Reference)tableEntry).get();
Object value = _valueField.get(tableEntry);
boolean remove = false;
if (key != null) {
Class keyClass = key.getClass();
ClassLoader keyClassLoader = keyClass.getClassLoader();
if (keyClassLoader == classLoader) {
remove = true;
}
}
if (value != null) {
Class valueClass = value.getClass();
ClassLoader valueClassLoader = valueClass.getClassLoader();
if (valueClassLoader == classLoader) {
remove = true;
}
}
if (remove) {
if (key != null) {
if (_log.isDebugEnabled()) {
Class keyClass = key.getClass();
_log.debug(
"Clear a ThreadLocal with key of type " +
keyClass.getCanonicalName());
}
_removeMethod.invoke(threadLocalMap, key);
}
else {
staleEntriesCount++;
}
}
}
if (staleEntriesCount > 0) {
_expungeStaleEntriesMethod.invoke(threadLocalMap);
}
}
private static Log _log = LogFactoryUtil.getLog(ClearThreadLocalUtil.class);
private static Method _expungeStaleEntriesMethod;
private static Field _inheritableThreadLocalsField;
private static boolean _initialized;
private static Method _removeMethod;
private static Field _tableField;
private static Field _threadLocalsField;
private static Field _valueField;
static {
try {
_inheritableThreadLocalsField = ReflectionUtil.getDeclaredField(
Thread.class, "inheritableThreadLocals");
_threadLocalsField = ReflectionUtil.getDeclaredField(
Thread.class, "threadLocals");
Class threadLocalMapClass = Class.forName(
"java.lang.ThreadLocal$ThreadLocalMap");
_expungeStaleEntriesMethod = ReflectionUtil.getDeclaredMethod(
threadLocalMapClass, "expungeStaleEntries");
_removeMethod = ReflectionUtil.getDeclaredMethod(
threadLocalMapClass, "remove", ThreadLocal.class);
_tableField = ReflectionUtil.getDeclaredField(
threadLocalMapClass, "table");
Class threadLocalMapEntryClass = Class.forName(
"java.lang.ThreadLocal$ThreadLocalMap$Entry");
_valueField = ReflectionUtil.getDeclaredField(
threadLocalMapEntryClass, "value");
_initialized = true;
}
catch (Throwable t) {
_initialized = false;
if (_log.isWarnEnabled()) {
_log.warn("Failed to initialize ClearThreadLocalUtil", t);
}
}
}
}