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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.store;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.apache.log4j.Logger;
import org.apache.qpid.server.configuration.IllegalConfigurationException;
import org.apache.qpid.server.logging.EventLogger;
import org.apache.qpid.server.logging.messages.ConfigStoreMessages;
import org.apache.qpid.server.logging.subjects.MessageStoreLogSubject;
import static org.apache.qpid.server.model.VirtualHost.CURRENT_CONFIG_VERSION;
public class DurableConfigurationRecoverer implements ConfigurationRecoveryHandler
{
private static final Logger _logger = Logger.getLogger(DurableConfigurationRecoverer.class);
private final Map<String, Map<UUID, Object>> _resolvedObjects = new HashMap<String, Map<UUID, Object>>();
private final Map<String, Map<UUID, UnresolvedObject>> _unresolvedObjects =
new HashMap<String, Map<UUID, UnresolvedObject>>();
private final Map<String, Map<UUID, List<DependencyListener>>> _dependencyListeners =
new HashMap<String, Map<UUID, List<DependencyListener>>>();
private final Map<String, DurableConfiguredObjectRecoverer> _recoverers;
private final UpgraderProvider _upgraderProvider;
private final EventLogger _eventLogger;
private DurableConfigurationStoreUpgrader _upgrader;
private DurableConfigurationStore _store;
private final String _name;
private MessageStoreLogSubject _logSubject;
public DurableConfigurationRecoverer(final String name,
Map<String, DurableConfiguredObjectRecoverer> recoverers,
UpgraderProvider upgraderProvider, EventLogger eventLogger)
{
_recoverers = recoverers;
_name = name;
_upgraderProvider = upgraderProvider;
_eventLogger = eventLogger;
}
@Override
public void beginConfigurationRecovery(final DurableConfigurationStore store, final int configVersion)
{
_logSubject = new MessageStoreLogSubject(_name, store.getClass().getSimpleName());
_store = store;
_upgrader = _upgraderProvider.getUpgrader(configVersion, this);
}
@Override
public void configuredObject(ConfiguredObjectRecord record)
{
_upgrader.configuredObject(record);
}
void onConfiguredObject(ConfiguredObjectRecord record)
{
DurableConfiguredObjectRecoverer recoverer = getRecoverer(record.getType());
if(recoverer == null)
{
throw new IllegalConfigurationException("Unknown type for configured object: " + record.getType());
}
recoverer.load(this, record);
}
private DurableConfiguredObjectRecoverer getRecoverer(final String type)
{
DurableConfiguredObjectRecoverer recoverer = _recoverers.get(type);
return recoverer;
}
@Override
public int completeConfigurationRecovery()
{
_upgrader.complete();
checkUnresolvedDependencies();
applyUpgrade();
_eventLogger.message(_logSubject, ConfigStoreMessages.RECOVERY_COMPLETE());
return CURRENT_CONFIG_VERSION;
}
private void applyUpgrade()
{
final Collection<ConfiguredObjectRecord> updates = new HashSet<ConfiguredObjectRecord>(_upgrader.getUpdatedRecords().values());
final Collection<ConfiguredObjectRecord> deletes = new HashSet<ConfiguredObjectRecord>(_upgrader.getDeletedRecords().values());
// Due to the way the upgraders work it is possible that the updates list may contain nulls
updates.remove(null);
deletes.remove(null);
if(!updates.isEmpty())
{
_store.update(true,updates.toArray(new ConfiguredObjectRecord[updates.size()]));
}
if(!deletes.isEmpty())
{
_store.remove(deletes.toArray(new ConfiguredObjectRecord[deletes.size()]));
}
}
private void checkUnresolvedDependencies()
{
if(_unresolvedObjects != null && !_unresolvedObjects.isEmpty())
{
boolean unresolvedObjectsExist = false;
for(Map.Entry<String, Map<UUID, UnresolvedObject>>entry : _unresolvedObjects.entrySet())
{
for(Map.Entry<UUID,UnresolvedObject> obj : entry.getValue().entrySet())
{
unresolvedObjectsExist = true;
StringBuilder errorMessage = new StringBuilder("Durable configured object of type ");
errorMessage.append(entry.getKey()).append(" with id ").append(obj.getKey())
.append(" has unresolved dependencies: ");
for(UnresolvedDependency dep : obj.getValue().getUnresolvedDependencies())
{
errorMessage.append(dep.getType()).append(" with id ").append(dep.getId()).append("; ");
}
_logger.error(errorMessage);
}
}
if(unresolvedObjectsExist)
{
throw new IllegalConfigurationException("Durable configuration has unresolved dependencies");
}
}
}
void addResolutionListener(final String type,
final UUID id,
final DependencyListener dependencyListener)
{
Map<UUID, List<DependencyListener>> typeListeners = _dependencyListeners.get(type);
if(typeListeners == null)
{
typeListeners = new HashMap<UUID, List<DependencyListener>>();
_dependencyListeners.put(type, typeListeners);
}
List<DependencyListener> objectListeners = typeListeners.get(id);
if(objectListeners == null)
{
objectListeners = new ArrayList<DependencyListener>();
typeListeners.put(id, objectListeners);
}
objectListeners.add(dependencyListener);
}
Object getResolvedObject(final String type, final UUID id)
{
Map<UUID, Object> objects = _resolvedObjects.get(type);
return objects == null ? null : objects.get(id);
}
void resolve(final String type, final UUID id, final Object object)
{
Map<UUID, Object> typeObjects = _resolvedObjects.get(type);
if(typeObjects == null)
{
typeObjects = new HashMap<UUID, Object>();
_resolvedObjects.put(type, typeObjects);
}
typeObjects.put(id, object);
Map<UUID, UnresolvedObject> unresolved = _unresolvedObjects.get(type);
if(unresolved != null)
{
unresolved.remove(id);
}
Map<UUID, List<DependencyListener>> typeListeners = _dependencyListeners.get(type);
if(typeListeners != null)
{
List<DependencyListener> listeners = typeListeners.remove(id);
if(listeners != null)
{
for(DependencyListener listener : listeners)
{
listener.dependencyResolved(type, id, object);
}
}
}
}
void addUnresolvedObject(final String type,
final UUID id,
final UnresolvedObject obj)
{
Map<UUID, UnresolvedObject> typeObjects = _unresolvedObjects.get(type);
if(typeObjects == null)
{
typeObjects = new HashMap<UUID, UnresolvedObject>();
_unresolvedObjects.put(type, typeObjects);
}
typeObjects.put(id, obj);
}
}
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