org.apache.stratos.autoscaler.util.ConfUtil.java Source code

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Here is the source code for org.apache.stratos.autoscaler.util.ConfUtil.java

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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.stratos.autoscaler.util;

import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.XMLConfiguration;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.stratos.autoscaler.Constants;
import org.wso2.carbon.utils.CarbonUtils;

import java.io.File;

/**
 * This class contains utility methods for read Autoscaler configuration file.
 */
public class ConfUtil {

    private static Log log = LogFactory.getLog(ConfUtil.class);

    private XMLConfiguration config;

    private static ConfUtil instance = null;

    private ConfUtil(String configFilePath) {
        log.info("Loading configuration.....");
        try {

            File confFile;
            if (configFilePath != null && !configFilePath.isEmpty()) {
                confFile = new File(configFilePath);

            } else {
                confFile = new File(CarbonUtils.getCarbonConfigDirPath(), Constants.AUTOSCALER_CONFIG_FILE_NAME);
            }

            config = new XMLConfiguration(confFile);
        } catch (ConfigurationException e) {
            log.error("Unable to load autoscaler configuration file", e);
            config = new XMLConfiguration(); // continue with default values
        }
    }

    public static ConfUtil getInstance(String configFilePath) {
        if (instance == null) {
            instance = new ConfUtil(configFilePath);
        }
        return instance;
    }

    public XMLConfiguration getConfiguration() {
        return config;
    }

}