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HSQLDB example source code file (HsqlThreadFactory.java)

This example HSQLDB source code file (HsqlThreadFactory.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - HSQLDB tags/keywords

hsqlthreadfactory, hsqlthreadfactory, thread, thread, threadfactory, threadfactory

The HSQLDB HsqlThreadFactory.java source code

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package org.hsqldb.lib;

/**
 * The default HSQLDB thread factory implementation.  This factory can be
 * used to wrap other thread factories using the setImpl method, but, by
 * default simply produces new, vanilla thread objects constructed with
 * the supplied runnable object.
 *
 * @author boucherb@users
 * @version 1.7.2
 * @since 1.7.2
 */
class HsqlThreadFactory implements ThreadFactory {

    /**
     * The factory implementation.  Typically, this will be the
     * HsqlThreadFactory object itself.
     */
    protected ThreadFactory factory;

    /**
     * Constructs a new HsqlThreadFactory that uses itself as the factory
     * implementation.
     */
    public HsqlThreadFactory() {
        this(null);
    }

    /**
     * Constructs a new HsqlThreadFactory whose retrieved threads come from the
     * specified ThreadFactory object or from this factory implementation, if'
     * the specified implementation is null.
     *
     * @param f the factory implementation this factory uses
     */
    public HsqlThreadFactory(ThreadFactory f) {
        setImpl(f);
    }

    /**
     * Retreives a thread instance for running the specified Runnable
     * @param r The runnable that the retrieved thread handles
     * @return the requested thread inatance
     */
    public Thread newThread(Runnable r) {
        return factory == this ? new Thread(r)
                               : factory.newThread(r);
    }

    /**
     * Sets the factory implementation that this factory will use to
     * produce threads.  If the specified argument, f, is null, then
     * this factory uses itself as the implementation.
     *
     * @param f the factory implementation that this factory will use
     *      to produce threads
     * @return the previously installed factory implementation
     */
    public synchronized ThreadFactory setImpl(ThreadFactory f) {

        ThreadFactory old;

        old     = factory;
        factory = (f == null) ? this
                              : f;

        return old;
    }

    /**
     * Retrieves the factory implementation that this factory is using
     * to produce threads.
     *
     * @return the factory implementation that this factory is using to produce
     * threads.
     */
    public synchronized ThreadFactory getImpl() {
        return factory;
    }
}

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