org.trafodion.rest.util.RestConfiguration.java Source code

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Here is the source code for org.trafodion.rest.util.RestConfiguration.java

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/**
 *(C) Copyright 2015 Hewlett-Packard Development Company, L.P.
 *
 * 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.trafodion.rest.util;

import java.util.Map.Entry;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;

/**
 * Adds rest configuration files to a Configuration
 */
public class RestConfiguration extends Configuration {

    private static final Log LOG = LogFactory.getLog(RestConfiguration.class);

    // a constant to convert a fraction to a percentage
    private static final int CONVERT_TO_PERCENTAGE = 100;

    public static Configuration addRestResources(Configuration conf) {
        conf.addResource("rest-default.xml");
        conf.addResource("rest-site.xml");

        //    checkDefaultsVersion(conf);
        //    checkForClusterFreeMemoryLimit(conf);
        return conf;
    }

    /**
     * Creates a Configuration with Rest resources
     * @return a Configuration with Rest resources
     */
    public static Configuration create() {
        Configuration conf = new Configuration();
        return addRestResources(conf);
    }

    /**
     * @param that Configuration to clone.
     * @return a Configuration created with the rest-*.xml files plus
     * the given configuration.
     */
    public static Configuration create(final Configuration that) {
        Configuration conf = create();
        merge(conf, that);
        return conf;
    }

    /**
     * Merge two configurations.
     * @param destConf the configuration that will be overwritten with items
     *                 from the srcConf
     * @param srcConf the source configuration
     **/
    public static void merge(Configuration destConf, Configuration srcConf) {
        for (Entry<String, String> e : srcConf) {
            destConf.set(e.getKey(), e.getValue());
        }
    }

    /** For debugging.  Dump configurations to system output as xml format.
     * Master and RS configurations can also be dumped using
     * http services. e.g. "curl http://master:60010/dump"
     */
    public static void main(String[] args) throws Exception {
        RestConfiguration.create().writeXml(System.out);
    }
}