net.hydromatic.optiq.impl.spark.SparkRuntime Maven / Gradle / Ivy

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/*
// 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 net.hydromatic.optiq.impl.spark;

import net.hydromatic.linq4j.Enumerable;
import net.hydromatic.linq4j.Linq4j;

import net.hydromatic.optiq.DataContext;

import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.FlatMapFunction;

import java.util.*;

/**
 * Runtime utilities for Optiq's Spark adapter. Generated code calls these
 * methods.
 */
public abstract class SparkRuntime {
  private SparkRuntime() {}

  /** Converts an array into an RDD. */
  public static  JavaRDD createRdd(JavaSparkContext sc, T[] ts) {
    final List list = Arrays.asList(ts);
    return sc.parallelize(list);
  }

  /** Converts an enumerable into an RDD. */
  public static  JavaRDD createRdd(JavaSparkContext sc,
      Enumerable enumerable) {
    final List list = enumerable.toList();
    return sc.parallelize(list);
  }

  /** Converts an RDD into an enumerable. */
  public static  Enumerable asEnumerable(JavaRDD rdd) {
    return Linq4j.asEnumerable(rdd.collect());
  }

  /** Returns the Spark context for the current execution.
   *
   * Currently a global variable; maybe later held within {@code root}.
   */
  public static JavaSparkContext getSparkContext(DataContext root) {
    return (JavaSparkContext) SparkHandlerImpl.instance().sparkContext();
  }

  /** Combines linq4j {@link net.hydromatic.linq4j.function.Function}
   * and Spark {@link org.apache.spark.api.java.function.FlatMapFunction}. */
  public abstract static class OptiqFlatMapFunction
      extends FlatMapFunction
      implements net.hydromatic.linq4j.function.Function {
  }
}

// End SparkRuntime.java