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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.registry;
import org.apache.commons.configuration.Configuration;
import org.apache.log4j.Logger;
import org.apache.qpid.server.configuration.Configurator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* An abstract application registry that provides access to configuration information and handles the
* construction and caching of configurable objects.
* <p/>
* Subclasses should handle the construction of the "registered objects" such as the exchange registry.
*/
public abstract class ApplicationRegistry implements IApplicationRegistry
{
private static final Logger _logger = Logger.getLogger(ApplicationRegistry.class);
private static Map _instanceMap = new HashMap();
private final Map<Class<?>, Object> _configuredObjects = new HashMap<Class<?>, Object>();
protected final Configuration _configuration;
public static final int DEFAULT_INSTANCE = 1;
public static final String DEFAULT_APPLICATION_REGISTRY = "org.apache.qpid.server.util.NullApplicationRegistry";
public static String _APPLICATION_REGISTRY = DEFAULT_APPLICATION_REGISTRY;
static
{
Runtime.getRuntime().addShutdownHook(new Thread(new ShutdownService()));
}
private static class ShutdownService implements Runnable
{
public void run()
{
_logger.info("Shutting down application registries...");
try
{
synchronized (ApplicationRegistry.class)
{
Iterator keyIterator = _instanceMap.keySet().iterator();
while (keyIterator.hasNext())
{
int key = (Integer) keyIterator.next();
IApplicationRegistry instance = (IApplicationRegistry) _instanceMap.get(key);
if ((instance != null))
{
if (instance.getMessageStore() != null)
{
instance.getMessageStore().close();
}
}
}
}
}
catch (Exception e)
{
_logger.error("Error shutting down message store: " + e, e);
}
}
}
public static void initialise(IApplicationRegistry instance) throws Exception
{
initialise(instance, DEFAULT_INSTANCE);
}
public static void initialise(IApplicationRegistry instance, int instanceID) throws Exception
{
if (instance != null)
{
_logger.info("Initialising Application Registry:" + instanceID);
_instanceMap.put(instanceID, instance);
try
{
instance.initialise();
}
catch (Exception e)
{
_instanceMap.remove(instanceID);
throw e;
}
}
else
{
remove(instanceID);
}
}
public static void remove(int instanceID)
{
try
{
((IApplicationRegistry) _instanceMap.get(instanceID)).getMessageStore().close();
}
catch (Exception e)
{
}
finally
{
_instanceMap.remove(instanceID);
}
}
protected ApplicationRegistry(Configuration configuration)
{
_configuration = configuration;
}
public static IApplicationRegistry getInstance()
{
return getInstance(DEFAULT_INSTANCE);
}
public static IApplicationRegistry getInstance(int instanceID)
{
IApplicationRegistry instance = (IApplicationRegistry) _instanceMap.get(instanceID);
if (instance == null)
{
try
{
_logger.info("Creating DEFAULT_APPLICATION_REGISTRY: " + _APPLICATION_REGISTRY + " : Instance:" + instanceID);
IApplicationRegistry registry = (IApplicationRegistry) Class.forName(_APPLICATION_REGISTRY).getConstructor((Class[]) null).newInstance((Object[]) null);
ApplicationRegistry.initialise(registry, instanceID);
_logger.info("Initialised Application Registry:" + instanceID);
return registry;
}
catch (Exception e)
{
_logger.error("Error configuring application: " + e, e);
//throw new AMQBrokerCreationException(instanceID, "Unable to create Application Registry instance " + instanceID);
throw new RuntimeException("Unable to create Application Registry");
}
}
else
{
return instance;
}
}
public Configuration getConfiguration()
{
return _configuration;
}
public <T> T getConfiguredObject(Class<T> instanceType)
{
T instance = (T) _configuredObjects.get(instanceType);
if (instance == null)
{
try
{
instance = instanceType.newInstance();
}
catch (Exception e)
{
_logger.error("Unable to instantiate configuration class " + instanceType + " - ensure it has a public default constructor");
throw new IllegalArgumentException("Unable to instantiate configuration class " + instanceType + " - ensure it has a public default constructor");
}
Configurator.configure(instance);
_configuredObjects.put(instanceType, instance);
}
return instance;
}
public static void setDefaultApplicationRegistry(String clazz)
{
_APPLICATION_REGISTRY = clazz;
}
}
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