clean Thread Locals - Java java.lang

Java examples for java.lang:Thread

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Description

clean Thread Locals

Demo Code

/**//from   ww w  .j a  v a2  s . c o  m
 * 
 * Copyright 2014 The Darks ORM Project (Liu lihua)
 *
 * Licensed 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 com.java2s;
import java.lang.reflect.Array;
import java.lang.reflect.Field;

public class Main {
    public static void cleanThreadLocals(Thread thread)
            throws NoSuchFieldException, ClassNotFoundException,
            IllegalArgumentException, IllegalAccessException {
        if (thread == null)
            return;
        Field threadLocalsField = Thread.class
                .getDeclaredField("threadLocals");
        threadLocalsField.setAccessible(true);

        Class<?> threadLocalMapKlazz = Class
                .forName("java.lang.ThreadLocal$ThreadLocalMap");
        Field tableField = threadLocalMapKlazz.getDeclaredField("table");
        tableField.setAccessible(true);

        Object fieldLocal = threadLocalsField.get(thread);
        if (fieldLocal == null) {
            return;
        }
        Object table = tableField.get(fieldLocal);

        int threadLocalCount = Array.getLength(table);

        for (int i = 0; i < threadLocalCount; i++) {
            Object entry = Array.get(table, i);
            if (entry != null) {
                Field valueField = entry.getClass().getDeclaredField(
                        "value");
                valueField.setAccessible(true);
                Object value = valueField.get(entry);
                if (value != null) {

                    if ("java.util.concurrent.ConcurrentLinkedQueue"
                            .equals(value.getClass().getName())
                            || "java.util.concurrent.ConcurrentHashMap"
                                    .equals(value.getClass().getName())) {
                        valueField.set(entry, null);
                    }
                }

            }
        }
    }
}

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