/*******************************************************************************
* This file is part of OpenNMS(R).
*
* Copyright (C) 2009-2011 The OpenNMS Group, Inc.
* OpenNMS(R) is Copyright (C) 1999-2011 The OpenNMS Group, Inc.
*
* OpenNMS(R) is a registered trademark of The OpenNMS Group, Inc.
*
* OpenNMS(R) 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.
*
* OpenNMS(R) 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 OpenNMS(R). If not, see:
* http://www.gnu.org/licenses/
*
* For more information contact:
* OpenNMS(R) Licensing <license@opennms.org>
* http://www.opennms.org/
* http://www.opennms.com/
*******************************************************************************/
package org.opennms.core.soa.support;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.opennms.core.soa.Filter;
import org.opennms.core.soa.Registration;
import org.opennms.core.soa.RegistrationListener;
import org.opennms.core.soa.ServiceRegistry;
import org.opennms.core.soa.filter.FilterParser;
import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.util.Assert;
/**
* ReferenceFactoryBean
*
* @author brozow
* @version $Id: $
*/
public class ReferenceListFactoryBean<T> implements FactoryBean<List<T>>, InitializingBean, RegistrationListener<T> {
private ServiceRegistry m_serviceRegistry;
private Class<T> m_serviceInterface;
private List<RegistrationListener<T>> m_listeners = new CopyOnWriteArrayList<RegistrationListener<T>>();
private List<T> m_providerRegistrations = new CopyOnWriteArrayList<T>();
private Filter m_filter;
/**
* <p>setServiceRegistry</p>
*
* @param serviceRegistry a {@link org.opennms.core.soa.ServiceRegistry} object.
*/
public void setServiceRegistry(ServiceRegistry serviceRegistry) {
m_serviceRegistry = serviceRegistry;
}
/**
* <p>setServiceInterface</p>
*
* @param serviceInterface a {@link java.lang.Class} object.
*/
public void setServiceInterface(Class<T> serviceInterface) {
m_serviceInterface = serviceInterface;
}
public void setFilter(String filter) {
m_filter = (filter == null ? null : new FilterParser().parse(filter));
}
/**
* <p>getObject</p>
*
* @return a {@link java.lang.Object} object.
* @throws java.lang.Exception if any.
*/
public List<T> getObject() throws Exception {
return m_providerRegistrations;
}
/**
* <p>getObjectType</p>
*
* @return a {@link java.lang.Class} object.
*/
public Class<?> getObjectType() {
return List.class;
}
/**
* <p>isSingleton</p>
*
* @return a boolean.
*/
public boolean isSingleton() {
return true;
}
/**
* <p>afterPropertiesSet</p>
*
* @throws java.lang.Exception if any.
*/
@Override
public void afterPropertiesSet() throws Exception {
Assert.notNull(m_serviceRegistry, "The serviceRegistry must be set");
Assert.notNull(m_serviceInterface, "The serviceInterface must be set");
m_serviceRegistry.addListener(m_serviceInterface, this, true);
}
/** {@inheritDoc} */
public void providerRegistered(Registration registration, T provider) {
if (m_filter != null && !m_filter.match(registration.getProperties())) {
// this object doesn't match the filter so skip it
return;
}
m_providerRegistrations.add(provider);
for(RegistrationListener<T> listener : m_listeners) {
listener.providerRegistered(registration, provider);
}
}
/** {@inheritDoc} */
public void providerUnregistered(Registration registration, T provider) {
boolean found = m_providerRegistrations.remove(provider);
if (!found) {
// this object didn't belong to the match registrations so do nothing
return;
}
for(RegistrationListener<T> listener : m_listeners) {
listener.providerUnregistered(registration, provider);
}
}
/**
* <p>setListener</p>
*
* @param listener a {@link org.opennms.core.soa.RegistrationListener} object.
*/
public void setListener(RegistrationListener<T> listener) {
addListener(listener);
}
/**
* <p>addListener</p>
*
* @param listener a {@link org.opennms.core.soa.RegistrationListener} object.
*/
public void addListener(RegistrationListener<T> listener) {
m_listeners.add((RegistrationListener<T>) listener);
}
/**
* <p>removeListener</p>
*
* @param listener a {@link org.opennms.core.soa.RegistrationListener} object.
*/
public void removeListener(RegistrationListener<?> listener) {
m_listeners.remove(listener);
}
}