io.fabric8.hadoop.hdfs.NameNodeFactory.java Source code

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Here is the source code for io.fabric8.hadoop.hdfs.NameNodeFactory.java

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/**
 *  Copyright 2005-2014 Red Hat, Inc.
 *
 *  Red Hat 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 io.fabric8.hadoop.hdfs;

import java.io.File;
import java.util.Dictionary;
import java.util.Enumeration;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hdfs.server.namenode.FSNamesystem;
import org.apache.hadoop.hdfs.server.namenode.NameNode;
import io.fabric8.hadoop.Factory;

public class NameNodeFactory extends Factory<NameNode> {

    @Override
    protected NameNode doCreate(Dictionary properties) throws Exception {
        Configuration conf = new Configuration();
        for (Enumeration e = properties.keys(); e.hasMoreElements();) {
            Object key = e.nextElement();
            Object val = properties.get(key);
            conf.set(key.toString(), val.toString());
        }
        boolean exists = false;
        for (File file : FSNamesystem.getNamespaceDirs(conf)) {
            exists |= file.exists();
        }
        if (!exists) {
            NameNode.format(conf);
        }
        NameNode nameNode = NameNode.createNameNode(null, conf);
        return nameNode;
    }

    @Override
    protected void doDelete(NameNode service) throws Exception {
        service.stop();
    }

}