com.inmobi.messaging.consumer.util.MiniClusterUtil.java Source code

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Here is the source code for com.inmobi.messaging.consumer.util.MiniClusterUtil.java

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package com.inmobi.messaging.consumer.util;

/*
 * #%L
 * messaging-client-databus
 * %%
 * Copyright (C) 2012 - 2014 InMobi
 * %%
 * 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.
 * #L%
 */

import java.io.File;
import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hdfs.MiniDFSCluster;

public class MiniClusterUtil {

    private static MiniDFSCluster dfsCluster;
    private static FileSystem lfs;
    private static int numAccess = 0;

    public static synchronized MiniDFSCluster getDFSCluster(Configuration conf) throws IOException {
        if (dfsCluster == null) {
            lfs = FileSystem.getLocal(conf);
            lfs.delete(new Path(MiniClusterUtil.getBaseDirectory().toString()), true);
            dfsCluster = new MiniDFSCluster(conf, 1, true, null);
        }
        numAccess++;
        return dfsCluster;
    }

    public static synchronized void shutdownDFSCluster() throws IOException {
        numAccess--;
        if (numAccess == 0) {
            if (dfsCluster != null) {
                dfsCluster.shutdown();
            }
            lfs.delete(new Path(MiniClusterUtil.getBaseDirectory().toString()), true);
        }
    }

    /**
     * Just for cross version compatibility , should be removed later
     * @return
     */
    private static File getBaseDirectory() {
        return new File(System.getProperty("test.build.data", "build/test/data"), "dfs/");
    }

}