/*
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Jul 3, 2008
*/
package com.bigdata.btree.keys;
import com.bigdata.btree.IIndex;
/**
* A thread-local implementation.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*/
public class ThreadLocalKeyBuilderFactory implements IKeyBuilderFactory {
private final IKeyBuilderFactory delegate;
public ThreadLocalKeyBuilderFactory(final IKeyBuilderFactory delegate) {
if (delegate == null)
throw new IllegalArgumentException();
this.delegate = delegate;
}
/**
* A {@link ThreadLocal} variable providing access to thread-specific
* instances of a {@link IKeyBuilder} as configured by the delegate
* {@link IKeyBuilderFactory}.
* <p>
* Note: this {@link ThreadLocal} is not static since we need configuration
* properties from the constructor - those properties can be different for
* different {@link IIndex}s on the same machine.
*/
private ThreadLocal<IKeyBuilder> threadLocalKeyBuilder = new ThreadLocal<IKeyBuilder>() {
@Override
protected synchronized IKeyBuilder initialValue() {
return delegate.getKeyBuilder();
}
};
/**
* {@inheritDoc}
* <p>
* Return a {@link ThreadLocal} {@link IKeyBuilder} instance configured
* using the {@link IKeyBuilderFactory} specified to the ctor.
*/
@Override
public IKeyBuilder getKeyBuilder() {
return threadLocalKeyBuilder.get();
}
private ThreadLocal<IKeyBuilder> threadLocalPrimaryKeyBuilder = new ThreadLocal<IKeyBuilder>() {
@Override
protected synchronized IKeyBuilder initialValue() {
return delegate.getPrimaryKeyBuilder();
}
};
/**
* {@inheritDoc}
* <p>
* Return a {@link ThreadLocal} {@link IKeyBuilder} instance configured
* using the {@link IKeyBuilderFactory} specified to the ctor but with the
* {@link StrengthEnum} overriden as {@link StrengthEnum#Primary}.
*/
@Override
public IKeyBuilder getPrimaryKeyBuilder() {
return threadLocalPrimaryKeyBuilder.get();
}
}