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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.lifecycle;
import org.eclipse.net4j.internal.util.bundle.OM;
import org.eclipse.net4j.internal.util.event.Notifier;
import org.eclipse.net4j.internal.util.om.trace.ContextTracer;
import org.eclipse.net4j.util.ReflectUtil;
import org.eclipse.net4j.util.lifecycle.ILifecycle;
import org.eclipse.net4j.util.lifecycle.ILifecycleEvent;
import org.eclipse.net4j.util.lifecycle.ILifecycleState;
/**
* @author Eike Stepper
*/
public class Lifecycle extends Notifier implements ILifecycle.Introspection
{
public static boolean USE_LABEL = true;
private static final ContextTracer TRACER = new ContextTracer(OM.DEBUG_LIFECYCLE, Lifecycle.class);
private static final ContextTracer DUMPER = new ContextTracer(OM.DEBUG_LIFECYCLE_DUMP, Lifecycle.class);
private static final boolean TRACE_IGNORING = false;
private ILifecycleState lifecycleState = ILifecycleState.INACTIVE;
protected Lifecycle()
{
}
public final void activate() throws Exception
{
if (lifecycleState == ILifecycleState.INACTIVE)
{
if (TRACER.isEnabled())
{
TRACER.trace("Activating " + this);//$NON-NLS-1$
}
lifecycleState = ILifecycleState.ACTIVATING;
fireEvent(new LifecycleEvent(this, ILifecycleEvent.Kind.ABOUT_TO_ACTIVATE));
doBeforeActivate();
doActivate();
if (!isDeferredActivation())
{
deferredActivate();
}
}
else
{
if (TRACE_IGNORING && TRACER.isEnabled())
{
TRACER.format("Ignoring activation in state {0} for {1}", lifecycleState, this);//$NON-NLS-1$
}
}
}
public final Exception deactivate()
{
if (lifecycleState == ILifecycleState.ACTIVE || lifecycleState == ILifecycleState.ACTIVATING)
{
if (TRACER.isEnabled())
{
TRACER.trace("Deactivating " + this);//$NON-NLS-1$
}
try
{
lifecycleState = ILifecycleState.DEACTIVATING;
doBeforeDeactivate();
fireEvent(new LifecycleEvent(this, ILifecycleEvent.Kind.ABOUT_TO_DEACTIVATE));
if (!isDeferredDeactivation())
{
deferredDeactivate();
}
}
catch (Exception ex)
{
OM.LOG.error(ex);
return ex;
}
finally
{
lifecycleState = ILifecycleState.INACTIVE;
}
}
else
{
if (TRACE_IGNORING && TRACER.isEnabled())
{
TRACER.format("Ignoring deactivation in state {0} for {1}", lifecycleState, this);//$NON-NLS-1$
}
}
return null;
}
public final ILifecycleState getLifecycleState()
{
return lifecycleState;
}
public final boolean isActive()
{
return lifecycleState == ILifecycleState.ACTIVE;
}
@Override
public String toString()
{
if (USE_LABEL)
{
return ReflectUtil.getLabel(this);
}
return super.toString();
}
protected final void dump()
{
if (DUMPER.isEnabled())
{
DUMPER.trace("DUMP" + ReflectUtil.toString(this)); //$NON-NLS-1$
}
}
protected final void checkActive()
{
if (lifecycleState != ILifecycleState.ACTIVE)
{
throw new IllegalStateException("Not active: " + this);
}
}
protected final void checkInactive()
{
if (lifecycleState != ILifecycleState.INACTIVE)
{
throw new IllegalStateException("Not inactive: " + this);
}
}
protected final void deferredActivate()
{
lifecycleState = ILifecycleState.ACTIVE;
fireEvent(new LifecycleEvent(this, ILifecycleEvent.Kind.ACTIVATED));
dump();
}
protected final void deferredDeactivate() throws Exception
{
doDeactivate();
fireEvent(new LifecycleEvent(this, ILifecycleEvent.Kind.DEACTIVATED));
}
protected boolean isDeferredActivation()
{
return false;
}
protected boolean isDeferredDeactivation()
{
return false;
}
protected void doBeforeActivate() throws Exception
{
}
protected void doActivate() throws Exception
{
}
protected void doBeforeDeactivate() throws Exception
{
}
protected void doDeactivate() throws Exception
{
}
}
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