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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.HashMap;
import java.util.Map;
import org.apache.qpid.server.configuration.store.JsonConfigurationEntryStore;
import org.apache.qpid.server.plugin.QpidServiceLoader;
/**
* A helper class responsible for creation and opening of broker store.
*/
public class BrokerConfigurationStoreCreator
{
/**
* URL to resource containing broker default configuration
*/
public static final String DEFAULT_INITIAL_STORE_LOCATION = BrokerConfigurationStoreCreator.class.getClassLoader()
.getResource("initial-store.json").toExternalForm();
private Map<String, ConfigurationStoreFactory> _factories = new HashMap<String, ConfigurationStoreFactory>();
public BrokerConfigurationStoreCreator()
{
QpidServiceLoader<ConfigurationStoreFactory> serviceLoader = new QpidServiceLoader<ConfigurationStoreFactory>();
Iterable<ConfigurationStoreFactory> configurationStoreFactories = serviceLoader
.instancesOf(ConfigurationStoreFactory.class);
for (ConfigurationStoreFactory storeFactory : configurationStoreFactories)
{
String type = storeFactory.getStoreType();
ConfigurationStoreFactory factory = _factories.put(type.toLowerCase(), storeFactory);
if (factory != null)
{
throw new IllegalStateException("ConfigurationStoreFactory with type name '" + type
+ "' is already registered using class '" + factory.getClass().getName() + "', can not register class '"
+ storeFactory.getClass().getName() + "'");
}
}
}
/**
* Create broker configuration store for a given store location, store type, initial store location and initial store type
*
* @param storeLocation store location
* @param storeType store type
* @param initialStoreLocation initial store location
* @param initialStoreType initial store type
* @return store instance opened at given store location
* @throws IllegalConfigurationException if store type is unknown
*/
public ConfigurationEntryStore createStore(String storeLocation, String storeType, String initialStoreLocation,
String initialStoreType)
{
ConfigurationEntryStore store = createStore(storeType);
if (initialStoreLocation == null)
{
initialStoreLocation = DEFAULT_INITIAL_STORE_LOCATION;
initialStoreType = JsonConfigurationEntryStore.STORE_TYPE;
}
if (storeType.equals(initialStoreType))
{
store.open(storeLocation, initialStoreLocation);
}
else
{
ConfigurationEntryStore initialStore = createStore(initialStoreType);
initialStore.open(initialStoreLocation);
store.open(storeLocation, initialStore);
}
return store;
}
private ConfigurationEntryStore createStore(String storeType)
{
ConfigurationStoreFactory factory = _factories.get(storeType.toLowerCase());
if (factory == null)
{
throw new IllegalConfigurationException("Unknown store type: " + storeType);
}
return factory.createStore();
}
}
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