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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.server.configuration.store;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.TreeSet;
import java.util.UUID;
import org.apache.qpid.server.configuration.ConfigurationEntry;
import org.apache.qpid.server.configuration.ConfigurationEntryStore;
import org.apache.qpid.server.model.Broker;
import org.apache.qpid.server.model.ConfigurationChangeListener;
import org.apache.qpid.server.model.ConfiguredObject;
import org.apache.qpid.server.model.Model;
import org.apache.qpid.server.model.State;
import org.apache.qpid.server.model.VirtualHost;
public class StoreConfigurationChangeListener implements ConfigurationChangeListener
{
private ConfigurationEntryStore _store;
public StoreConfigurationChangeListener(ConfigurationEntryStore store)
{
super();
_store = store;
}
@Override
public void stateChanged(ConfiguredObject object, State oldState, State newState)
{
if (newState == State.DELETED)
{
_store.remove(object.getId());
object.removeChangeListener(this);
}
}
@Override
public void childAdded(ConfiguredObject object, ConfiguredObject child)
{
// exclude VirtualHost children from storing in broker store
if (!(object instanceof VirtualHost))
{
child.addChangeListener(this);
ConfigurationEntry parentEntry = toConfigurationEntry(object);
ConfigurationEntry childEntry = toConfigurationEntry(child);
_store.save(parentEntry, childEntry);
}
}
@Override
public void childRemoved(ConfiguredObject object, ConfiguredObject child)
{
_store.save(toConfigurationEntry(object));
}
@Override
public void attributeSet(ConfiguredObject object, String attrinuteName, Object oldAttributeValue, Object newAttributeValue)
{
_store.save(toConfigurationEntry(object));
}
private ConfigurationEntry toConfigurationEntry(ConfiguredObject object)
{
Class<? extends ConfiguredObject> objectType = getConfiguredObjectType(object);
Set<UUID> childrenIds = getChildernIds(object, objectType);
ConfigurationEntry entry = new ConfigurationEntry(object.getId(), objectType.getSimpleName(),
object.getActualAttributes(), childrenIds, _store);
return entry;
}
private Set<UUID> getChildernIds(ConfiguredObject object, Class<? extends ConfiguredObject> objectType)
{
// Virtual Host children's IDs should not be stored in broker store
if (object instanceof VirtualHost)
{
return Collections.emptySet();
}
Set<UUID> childrenIds = new TreeSet<UUID>();
Collection<Class<? extends ConfiguredObject>> childClasses = Model.getInstance().getChildTypes(objectType);
if (childClasses != null)
{
for (Class<? extends ConfiguredObject> childClass : childClasses)
{
Collection<? extends ConfiguredObject> children = object.getChildren(childClass);
if (children != null)
{
for (ConfiguredObject childObject : children)
{
childrenIds.add(childObject.getId());
}
}
}
}
return childrenIds;
}
private Class<? extends ConfiguredObject> getConfiguredObjectType(ConfiguredObject object)
{
if (object instanceof Broker)
{
return Broker.class;
}
return getConfiguredObjectTypeFromImplementedInterfaces(object.getClass());
}
@SuppressWarnings("unchecked")
private Class<? extends ConfiguredObject> getConfiguredObjectTypeFromImplementedInterfaces(Class<?> objectClass)
{
// get all implemented interfaces extending ConfiguredObject
Set<Class<?>> interfaces = getImplementedInterfacesExtendingSuper(objectClass, ConfiguredObject.class);
if (interfaces.size() == 0)
{
throw new RuntimeException("Can not identify the configured object type");
}
if (interfaces.size() == 1)
{
return (Class<? extends ConfiguredObject>)interfaces.iterator().next();
}
Set<Class<?>> superInterfaces = new HashSet<Class<?>>();
// find all super interfaces
for (Class<?> interfaceClass : interfaces)
{
for (Class<?> interfaceClass2 : interfaces)
{
if (interfaceClass != interfaceClass2)
{
if (interfaceClass.isAssignableFrom(interfaceClass2))
{
superInterfaces.add(interfaceClass);
}
}
}
}
// remove super interfaces
for (Class<?> superInterface : superInterfaces)
{
interfaces.remove(superInterface);
}
if (interfaces.size() == 1)
{
return (Class<? extends ConfiguredObject>)interfaces.iterator().next();
}
else
{
throw new RuntimeException("Can not identify the configured object type as an it implements"
+ " more than one configured object interfaces: " + interfaces);
}
}
private Set<Class<?>> getImplementedInterfacesExtendingSuper(Class<?> classInstance, Class<?> superInterface)
{
Set<Class<?>> interfaces = new HashSet<Class<?>>();
Class<?>[] classInterfaces = classInstance.getInterfaces();
for (Class<?> interfaceClass : classInterfaces)
{
if (interfaceClass!= superInterface && superInterface.isAssignableFrom(interfaceClass))
{
interfaces.add(interfaceClass);
}
}
Class<?> superClass = classInstance.getSuperclass();
if (superClass != null)
{
Set<Class<?>> superClassInterfaces = getImplementedInterfacesExtendingSuper(superClass, superInterface);
interfaces.addAll(superClassInterfaces);
}
return interfaces;
}
@Override
public String toString()
{
return "StoreConfigurationChangeListener [store=" + _store + "]";
}
}
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