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/*
 * Copyright 2001-2009 The Apache Software Foundation.
 * 
 * Licensed 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.juddi.v3.client.config;

import org.apache.commons.configuration.CompositeConfiguration;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.configuration.SystemConfiguration;
import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;
import org.apache.log4j.Logger;

/**
 * Handles the client configuration of the uddi-client. By default it first
 * looks at system properties.
 * 
 * @author Kurt T Stam
 */
public class ClientConfig 
{
	private final static String UDDI_PROPERTIES = "uddi.properties";
	private Logger log = Logger.getLogger(ClientConfig.class);
	private Configuration config;
	private static ClientConfig instance=null;
	
	/**
	 * Constructor (note Singleton pattern).
	 * @throws ConfigurationException
	 */
	private ClientConfig() throws ConfigurationException 
	{
		loadConfiguration();
	}
	/**
	 * Does the actual work of reading the configuration from System
	 * Properties and/or juddiv3.properties file. When the juddiv3.properties
	 * file is updated the file will be reloaded. By default the reloadDelay is
	 * set to 1 second to prevent excessive date stamp checking.
	 */
	private void loadConfiguration() throws ConfigurationException
	{
		//Properties from system properties
		CompositeConfiguration compositeConfig = new CompositeConfiguration();
		compositeConfig.addConfiguration(new SystemConfiguration());
		//Properties from file
		PropertiesConfiguration propConfig = new PropertiesConfiguration(UDDI_PROPERTIES);
		
		long refreshDelay = propConfig.getLong(Property.UDDI_CONFIGURATION_RELOAD_DELAY, 1000l);
		log.debug("Setting refreshDelay to " + refreshDelay);
		FileChangedReloadingStrategy fileChangedReloadingStrategy = new FileChangedReloadingStrategy();
		fileChangedReloadingStrategy.setRefreshDelay(refreshDelay);
		propConfig.setReloadingStrategy(fileChangedReloadingStrategy);
		compositeConfig.addConfiguration(propConfig);
	
		//Making the new configuration globally accessible.
		config = compositeConfig;
	}

	
	
	
	/**
	 * Obtains the reference to the Singleton instance.
	 * 
	 * @return the APplicationConfuration Singleton Instance.
	 * @throws ConfigurationException
	 */
	private static ClientConfig getInstance() throws ConfigurationException 
	{
		if (instance==null) {
			instance = new ClientConfig();
		}
		return instance;
	}
	/**
	 * Hook to receive configuration reload events from an external application.
	 * 
	 * @throws ConfigurationException
	 */
	public static void reloadConfig() throws ConfigurationException
	{
		getInstance().loadConfiguration();
	}
	/**
	 * The object from which property values can be obtained.
	 * @return the commons Configuration interface
	 * @throws ConfigurationException 
	 */
	public static Configuration getConfiguration() throws ConfigurationException
	{
		return getInstance().config;
	}
}