/*******************************************************************************
*
* Copyright (c) 2009 Fujitsu Services Ltd.
*
* Author: Nick Battle
*
* This file is part of VDMJ.
*
* VDMJ 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, either version 3 of the License, or
* (at your option) any later version.
*
* VDMJ 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 VDMJ. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
package org.overture.interpreter.scheduler;
import java.io.Serializable;
import org.overture.ast.intf.lex.ILexLocation;
import org.overture.interpreter.runtime.Context;
public class Holder<T> implements Serializable
{
private static final long serialVersionUID = 1L;
private ControlQueue cq = new ControlQueue();
private T contents = null;
public synchronized void set(T object)
{
contents = object;
cq.stim();
}
public T get(Context ctxt, ILexLocation location)
{
cq.join(ctxt, location);
while (contents == null)
{
cq.block(ctxt, location);
}
T result = null;
synchronized (this)
{
result = contents;
}
cq.leave();
return result;
}
}