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HSQLDB - Lightweight 100% Java SQL Database Engine
/* Copyright (c) 2001-2019, 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
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*/
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 Campbell Burnet (campbell-burnet@users dot sourceforge.net)
* @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);
}
/**
* Retrieves a thread instance for running the specified Runnable
* @param r The runnable that the retrieved thread handles
* @return the requested thread instance
*/
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;
}
}