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A set of utilities and tools to speed up and ease programming in Java.
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/*
 * (c) 2005 David B. Bracewell
 *
 * 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 com.davidbracewell.stream;

import com.davidbracewell.config.Config;
import com.davidbracewell.conversion.Cast;
import com.davidbracewell.string.StringUtils;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;

/**
 * The interface Spark.
 *
 * @author David B. Bracewell
 */
public final class Spark {

  /**
   * The constant SPARK_MASTER.
   */
  public static String SPARK_MASTER = "spark.master";
  /**
   * The constant SPARK_APPNAME.
   */
  public static String SPARK_APPNAME = "spark.appName";

  private static volatile JavaSparkContext context;


  /**
   * Gets context.
   *
   * @return the context
   */
  public static JavaSparkContext context() {
    if (context == null) {
      synchronized (Spark.class) {
        if (context == null) {
          SparkConf conf = new SparkConf();
          if (Config.hasProperty(SPARK_MASTER)) {
            conf.setMaster(Config.get(SPARK_MASTER).asString());
          }
          conf.setAppName(Config.get(SPARK_APPNAME).asString(StringUtils.randomHexString(20)));
          context = new JavaSparkContext(conf);
        }
      }
    }
    return context;
  }

  /**
   * Context java spark context.
   *
   * @param stream the stream
   * @return the java spark context
   */
  public static JavaSparkContext context(MStream stream) {
    if (stream == null) {
      return context();
    } else if (stream instanceof SparkStream) {
      return context(Cast.as(stream).getRDD());
    }
    return context();
  }

  /**
   * Context java spark context.
   *
   * @param rdd the rdd
   * @return the java spark context
   */
  public static JavaSparkContext context(JavaRDD rdd) {
    if (rdd == null) {
      return context();
    }
    return new JavaSparkContext(rdd.context());
  }

  /**
   * Context java spark context.
   *
   * @param rdd the rdd
   * @return the java spark context
   */
  public static JavaSparkContext context(JavaPairRDD rdd) {
    if (rdd == null) {
      return context();
    }
    return new JavaSparkContext(rdd.context());
  }

}//END OF Spark