/*
* JBoss, Home of Professional Open Source.
* Copyright 2011, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.controller;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import org.jboss.msc.service.Service;
import org.jboss.msc.service.ServiceController;
import org.jboss.msc.service.ServiceName;
import org.jboss.msc.service.ServiceTarget;
import org.jboss.msc.service.StartContext;
import org.jboss.msc.service.StartException;
import org.jboss.msc.service.StopContext;
/**
* Exposes the current {@link ControlledProcessState.State} and allows services to register a listener for changes
* to it.
*
* @author Brian Stansberry (c) 2011 Red Hat Inc.
*/
public class ControlledProcessStateService implements Service<ControlledProcessStateService> {
public static final ServiceName SERVICE_NAME = ServiceName.JBOSS.append("controlled-process-state");
public static ServiceController<ControlledProcessStateService> addService(ServiceTarget target,
ControlledProcessState processState) {
ControlledProcessStateService service = processState.getService();
return target.addService(SERVICE_NAME, service).install();
}
private ControlledProcessState.State processState;
private final PropertyChangeSupport changeSupport;
ControlledProcessStateService(ControlledProcessState.State initialState) {
this.processState = initialState;
changeSupport = new PropertyChangeSupport(this);
}
@Override
public void start(StartContext context) throws StartException {
}
@Override
public void stop(StopContext context) {
}
@Override
public ControlledProcessStateService getValue() {
return this;
}
/**
* Returns the current process state.
*
* @return the current state
*/
public ControlledProcessState.State getCurrentState() {
return processState;
}
/**
* Registers a listener for changes to the process state.
*
* @param listener the listener
*/
public void addPropertyChangeListener(
PropertyChangeListener listener) {
changeSupport.addPropertyChangeListener(listener);
}
/**
* Removes a previously {@link #addPropertyChangeListener(PropertyChangeListener) registered listener}.
*
* @param listener the listener
*/
public void removePropertyChangeListener(
PropertyChangeListener listener) {
changeSupport.removePropertyChangeListener(listener);
}
synchronized void stateChanged(ControlledProcessState.State newState) {
final ControlledProcessState.State oldState = processState;
processState = newState;
changeSupport.firePropertyChange("currentState", oldState, newState);
}
}