co.cask.cdap.common.conf.CConfiguration.java Source code

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Here is the source code for co.cask.cdap.common.conf.CConfiguration.java

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/*
 * Copyright  2014 Cask Data, Inc.
 *
 * 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 co.cask.cdap.common.conf;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Properties;

/**
 * CConfiguration is an extension of the Hadoop Configuration class. By default,
 * this class provides a empty configuration. To add a set of resources from an
 * XML file, make sure the file is in the classpath and use
 * <code>config.addResource("my file name");</code>
 *
 * <strong>Note:</strong> This class will lazily load any configuration
 * properties, therefore you will not be able to access them until you
 * have called one of the getXXX methods at least once.
 */
public class CConfiguration extends Configuration {
    @SuppressWarnings("unused")
    private static final Logger LOG = LoggerFactory.getLogger(CConfiguration.class);

    private CConfiguration() {
        // Shouldn't be used other than in this class.
    }

    /**
     * Creates an instance of configuration.
     *
     * @return an instance of CConfiguration.
     */
    public static CConfiguration create() {
        // Create a new configuration instance, but do NOT initialize with
        // the Hadoop default properties.
        CConfiguration conf = new CConfiguration();
        conf.addResource("cdap-default.xml");
        conf.addResource("cdap-site.xml");
        return conf;
    }

    public void copyTxProperties(org.apache.hadoop.conf.Configuration destination) {
        Properties props = getProps();
        for (String property : props.stringPropertyNames()) {
            if (property.startsWith("data.tx") || property.startsWith("tx.persist")) {
                destination.set(property, get(property));
            }
        }
    }
}