/*
* JBoss, Home of Professional Open Source
* Copyright 2006, Red Hat Middleware LLC, and individual contributors
* as indicated by the @author tags.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public License,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 2005-2006,
* @author JBoss Inc.
*/
/*
* Copyright (C) 1998, 1999, 2000,
*
* Arjuna Solutions Limited,
* Newcastle upon Tyne,
* Tyne and Wear,
* UK.
*
* $Id: Semaphore.java 2342 2006-03-30 13:06:17Z $
*/
package com.arjuna.ats.txoj.semaphore;
import com.arjuna.ats.txoj.TxOJNames;
import com.arjuna.ats.txoj.common.*;
import com.arjuna.ats.internal.txoj.Implementations;
import com.arjuna.ats.arjuna.gandiva.inventory.Inventory;
import com.arjuna.ats.arjuna.gandiva.ClassName;
import com.arjuna.ats.arjuna.gandiva.ObjectName;
import com.arjuna.ats.arjuna.common.Uid;
import java.io.IOException;
/**
* Semaphore interface. Binds to interpreter specific implementation.
*
* @author Mark Little (mark@arjuna.com)
* @version $Id: Semaphore.java 2342 2006-03-30 13:06:17Z $
* @since JTS 1.0.
*/
public class Semaphore
{
public static final int SM_LOCKED = 0;
public static final int SM_UNLOCKED = 1;
public static final int SM_WOULD_BLOCK = 2;
public static final int SM_ERROR = 3;
/**
* Create a semaphore with the default implementation.
*/
public Semaphore (String key)
{
Object[] param = new Object[1];
param[0] = key;
Object ptr = Inventory.inventory().createResources(TxOJNames.Implementation_Semaphore_BasicSemaphore(), param);
if (ptr instanceof SemaphoreImple)
_imple = (SemaphoreImple) ptr;
else
_imple = null;
}
public Semaphore (ClassName type)
{
Object ptr = Inventory.inventory().createVoid(type);
if (ptr instanceof SemaphoreImple)
_imple = (SemaphoreImple) ptr;
else
_imple = null;
}
public Semaphore (ObjectName objName)
{
_imple = null;
if (objName != null)
{
try
{
ClassName semaphoreType = objName.getClassNameAttribute("SemaphoreType");
ObjectName semaphoreName = objName.getObjectNameAttribute("SemaphoreName");
Object ptr = Inventory.inventory().createObjectName(semaphoreType, semaphoreName);
if (ptr instanceof SemaphoreImple)
_imple = (SemaphoreImple) ptr;
}
catch (IOException e)
{
}
}
}
public int lock ()
{
return ((_imple != null) ? _imple.lock() : Semaphore.SM_ERROR);
}
public int unlock ()
{
return ((_imple != null) ? _imple.unlock() : Semaphore.SM_ERROR);
}
public int tryLock ()
{
return ((_imple != null) ? _imple.tryLock() : Semaphore.SM_ERROR);
}
public ClassName className ()
{
return ((_imple != null) ? _imple.className() : ClassName.invalid());
}
private SemaphoreImple _imple;
static
{
if (!Implementations.added())
Implementations.initialise();
}
}