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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2009 Red Hat Inc. and/or its affiliates and other
 * contributors as indicated by the @author tags. All rights reserved.
 * See the copyright.txt in the distribution for a full listing of
 * individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.infinispan.config;

import java.util.Set;


/**
 * A registry for {@link Configuration}s.
 *
 * @author Brian Stansberry
 * @since 4.0
 */
public interface ConfigurationRegistry {
   /**
    * Gets a {@link Configuration#clone() clone} of the {@link Configuration} registered under the given name.
    * 
    * The returned object is a clone of the internally held configuration, so any changes made to it by the caller will
    * not affect the internal state of this registry.
    *
    * @param configName the name of the configuration
    * @return a Configuration. Will not be null.
    * @throws IllegalArgumentException if no configuration is registered under configName
    */
   Configuration getConfiguration(String configName) throws Exception;

   /**
    * Register the given configuration under the given name.
    * 
    * The configuration will be cloned before being stored internally, so the copy under the control of the registry
    * will not be affected by any external changes.
    *
    * @param configName the name of the configuration
    * @param config     the configuration
    * @throws CloneNotSupportedException
    * @throws IllegalStateException      if a configuration is already registered under configName
    */
   void registerConfiguration(String configName, Configuration config) throws CloneNotSupportedException;

   /**
    * Unregisters the named configuration.
    *
    * @param configName the name of the configuration
    * @throws IllegalStateException if no configuration is registered under configName
    */
   void unregisterConfiguration(String configName);

   /**
    * Gets the names of all registered configurations.
    *
    * @return a set of configuration names
    */
   Set getConfigurationNames();
}