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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;
import java.util.UUID;
import java.util.Collection;
import java.util.Collections;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.atomic.AtomicReference;
public class ConfigStore
{
private ConcurrentHashMap<ConfigObjectType, ConcurrentHashMap<UUID, ConfiguredObject>> _typeMap =
new ConcurrentHashMap<ConfigObjectType, ConcurrentHashMap<UUID, ConfiguredObject>>();
private ConcurrentHashMap<ConfigObjectType, CopyOnWriteArrayList<ConfigEventListener>> _listenerMap =
new ConcurrentHashMap<ConfigObjectType, CopyOnWriteArrayList<ConfigEventListener>>();
private AtomicReference<SystemConfig> _root = new AtomicReference<SystemConfig>(null);
private final AtomicLong _objectIdSource = new AtomicLong(0l);
private final AtomicLong _persistentObjectIdSource = new AtomicLong(0l);
// TODO - should load/increment this on broker startup
private long _sequenceNumber = 1L;
public enum Event
{
CREATED, DELETED
}
public interface ConfigEventListener<T extends ConfigObjectType<T,C>, C extends ConfiguredObject<T, C>>
{
void onEvent(C object, Event evt);
}
private ConfigStore()
{
}
public <T extends ConfigObjectType<T, C>, C extends ConfiguredObject<T, C>> ConfiguredObject<T, C> getConfiguredObject(ConfigObjectType<T,C> type, UUID id)
{
ConcurrentHashMap<UUID, ConfiguredObject> typeMap = _typeMap.get(type);
if(typeMap != null)
{
return typeMap.get(id);
}
else
{
return null;
}
}
public <T extends ConfigObjectType<T, C>, C extends ConfiguredObject<T, C>> Collection<? extends C> getConfiguredObjects(ConfigObjectType<T,C> type)
{
ConcurrentHashMap typeMap = _typeMap.get(type);
if(typeMap != null)
{
return typeMap.values();
}
else
{
return Collections.EMPTY_LIST;
}
}
public <T extends ConfigObjectType<T, C>, C extends ConfiguredObject<T, C>> void addConfiguredObject(ConfiguredObject<T, C> object)
{
ConcurrentHashMap typeMap = _typeMap.get(object.getConfigType());
if(typeMap == null)
{
typeMap = new ConcurrentHashMap();
ConcurrentHashMap oldMap = _typeMap.putIfAbsent(object.getConfigType(), typeMap);
if(oldMap != null)
{
typeMap = oldMap;
}
}
typeMap.put(object.getId(), object);
sendEvent(Event.CREATED, object);
}
public <T extends ConfigObjectType<T, C>, C extends ConfiguredObject<T, C>> void removeConfiguredObject(ConfiguredObject<T, C> object)
{
ConcurrentHashMap typeMap = _typeMap.get(object.getConfigType());
if(typeMap != null)
{
typeMap.remove(object.getId());
sendEvent(Event.DELETED, object);
}
}
public <T extends ConfigObjectType<T, C>, C extends ConfiguredObject<T, C>> void addConfigEventListener(T type, ConfigEventListener<T,C> listener)
{
CopyOnWriteArrayList listeners = _listenerMap.get(type);
if(listeners == null)
{
listeners = new CopyOnWriteArrayList();
CopyOnWriteArrayList oldListeners = _listenerMap.putIfAbsent(type, listeners);
if(oldListeners != null)
{
listeners = oldListeners;
}
}
listeners.add(listener);
}
public <T extends ConfigObjectType<T, C>, C extends ConfiguredObject<T, C>> void removeConfigEventListener(T type, ConfigEventListener<T,C> listener)
{
CopyOnWriteArrayList listeners = _listenerMap.get(type);
if(listeners != null)
{
listeners.remove(listener);
}
}
private void sendEvent(Event e, ConfiguredObject o)
{
CopyOnWriteArrayList<ConfigEventListener> listeners = _listenerMap.get(o.getConfigType());
if(listeners != null)
{
for(ConfigEventListener listener : listeners)
{
listener.onEvent(o, e);
}
}
}
public boolean setRoot(SystemConfig object)
{
if(_root.compareAndSet(null,object))
{
addConfiguredObject(object);
return true;
}
else
{
return false;
}
}
public UUID createId()
{
return new UUID(((_sequenceNumber & 0xFFFl)<<48), _objectIdSource.incrementAndGet());
}
public UUID createPersistentId()
{
return new UUID(0L, _persistentObjectIdSource.incrementAndGet());
}
public void persistentIdInUse(UUID id)
{
long lsb = id.getLeastSignificantBits();
long currentId;
while((currentId = _persistentObjectIdSource.get()) < lsb)
{
_persistentObjectIdSource.compareAndSet(currentId, lsb);
}
}
public SystemConfig getRoot()
{
return _root.get();
}
public static ConfigStore newInstance()
{
return new ConfigStore();
}
}
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