org.alloy.metal.state.ThreadLocalManager.java Source code

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Here is the source code for org.alloy.metal.state.ThreadLocalManager.java

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/*
* #%L
* BroadleafCommerce Common Libraries
* %%
* Copyright (C) 2009 - 2013 Broadleaf Commerce
* %%
* 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.
* #L%
*/

package org.alloy.metal.state;

import java.util.LinkedHashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
* @author Jeff Fischer
*/
public class ThreadLocalManager {

    private static final Log LOG = LogFactory.getLog(ThreadLocalManager.class);

    private static final ThreadLocal<ThreadLocalManager> THREAD_LOCAL_MANAGER = new ThreadLocal<ThreadLocalManager>() {
        @Override
        protected ThreadLocalManager initialValue() {
            return new ThreadLocalManager();
        }
    };

    protected Map<Long, ThreadLocal<?>> threadLocals = new LinkedHashMap<Long, ThreadLocal<?>>();

    public static void addThreadLocal(ThreadLocal<?> threadLocal) {
        Long position;
        synchronized (threadLock) {
            count++;
            position = count;
        }
        THREAD_LOCAL_MANAGER.get().threadLocals.put(position, threadLocal);
    }

    public static <T> ThreadLocal<T> createThreadLocal(final Class<T> type) {
        return createThreadLocal(type, true);
    }

    public static <T> ThreadLocal<T> createThreadLocal(final Class<T> type, final boolean createInitialValue) {
        ThreadLocal<T> response = new ThreadLocal<T>() {
            @Override
            protected T initialValue() {
                addThreadLocal(this);
                if (!createInitialValue) {
                    return null;
                }
                try {
                    return type.newInstance();
                } catch (InstantiationException e) {
                    throw new RuntimeException(e);
                } catch (IllegalAccessException e) {
                    throw new RuntimeException(e);
                }
            }

            @Override
            public void set(T value) {
                super.set(value);
            }
        };
        return response;
    }

    public static void remove() {
        for (Map.Entry<Long, ThreadLocal<?>> entry : THREAD_LOCAL_MANAGER.get().threadLocals.entrySet()) {
            if (LOG.isDebugEnabled()) {
                LOG.debug("Removing ThreadLocal #" + entry.getKey() + " from request thread.");
            }
            entry.getValue().remove();
        }
        THREAD_LOCAL_MANAGER.get().threadLocals.clear();
        THREAD_LOCAL_MANAGER.remove();
    }

    private static Long count = 0L;
    private static final Object threadLock = new Object();
}