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/***************************************************************************
* Copyright (c) 2004 - 2007 Eike Stepper, Germany.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.internal.util.om.monitor;
import org.eclipse.net4j.util.om.monitor.IllegalMonitorNestingException;
import org.eclipse.net4j.util.om.monitor.MonitorAlreadyBegunException;
import org.eclipse.net4j.util.om.monitor.MonitorException;
import org.eclipse.net4j.util.om.monitor.MonitorNotBegunException;
import org.eclipse.net4j.util.om.monitor.OMMonitor;
/**
* @author Eike Stepper
*/
public final class MON
{
public static final int UNKNOWN = -1;
private static final ThreadLocal<Monitor> CURRENT = new ThreadLocal();
private static final NullMonitor NULL_MONITOR = new NullMonitor();
private MON()
{
}
public static void startMonitoring(Monitor rootMonitor)
{
Monitor current = CURRENT.get();
if (current != null)
{
throw new IllegalMonitorNestingException("Monitoring has already been started");
}
CURRENT.set(rootMonitor);
}
public static void stopMonitoring()
{
Monitor current = CURRENT.get();
if (current == null)
{
throw new IllegalMonitorNestingException("Monitoring has not been started");
}
if (current.getParent() != null)
{
throw new IllegalMonitorNestingException("Illegal monitor nesting");
}
current.done();
CURRENT.set(null);
}
public static OMMonitor begin(int totalWork, String task)
{
Monitor current = CURRENT.get();
if (current == null)
{
return NULL_MONITOR;
}
if (current.hasBegun())
{
throw new MonitorAlreadyBegunException("Monitor has already begun");
}
current.begin(totalWork, task);
return current;
}
static void checkMonitor(Monitor monitor) throws MonitorException
{
Monitor current = CURRENT.get();
if (current != monitor)
{
throw new IllegalMonitorNestingException("Illegal monitor nesting\n" + //
"Current monitor stack: " + current.dump() + "\n" + //
" Used monitor stack: " + monitor.dump() + "\n");
}
if (!current.hasBegun())
{
throw new MonitorNotBegunException("Monitor has not begun");
}
monitor.checkCanceled();
}
static void setMonitor(Monitor monitor)
{
CURRENT.set(monitor);
}
}
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