co.cask.cdap.etl.batch.spark.SparkBatchSinkContext Maven / Gradle / Ivy

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/*
 * Copyright © 2015 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.etl.batch.spark;

import co.cask.cdap.api.data.batch.Output;
import co.cask.cdap.api.data.batch.OutputFormatProvider;
import co.cask.cdap.api.spark.SparkClientContext;
import co.cask.cdap.etl.api.LookupProvider;
import co.cask.cdap.etl.api.batch.BatchSinkContext;
import co.cask.cdap.etl.common.ExternalDatasets;

import java.util.Collections;
import java.util.Map;
import java.util.UUID;

/**
 * Default implementation of {@link BatchSinkContext} for spark contexts.
 */
public class SparkBatchSinkContext extends AbstractSparkBatchContext implements BatchSinkContext {

  private final SparkBatchSinkFactory sinkFactory;

  public SparkBatchSinkContext(SparkBatchSinkFactory sinkFactory, SparkClientContext sparkContext,
                               LookupProvider lookupProvider, String stageId) {
    super(sparkContext, lookupProvider, stageId);
    this.sinkFactory = sinkFactory;
  }

  @Override
  public void addOutput(String datasetName) {
    addOutput(datasetName, Collections.emptyMap());
  }

  @Override
  public void addOutput(String datasetName, Map arguments) {
    sinkFactory.addOutput(getStageName(), suffixOutput(Output.ofDataset(datasetName, arguments)));
  }

  @Override
  public void addOutput(String outputName, OutputFormatProvider outputFormatProvider) {
    sinkFactory.addOutput(getStageName(), suffixOutput(Output.of(outputName, outputFormatProvider)));
  }

  @Override
  public void addOutput(Output output) {
    Output trackableOutput = ExternalDatasets.makeTrackable(sparkContext.getAdmin(), suffixOutput(output));
    sinkFactory.addOutput(getStageName(), trackableOutput);
  }

  /**
   * Suffix the alias of {@link Output} so that aliases of outputs are unique.
   */
  private Output suffixOutput(Output output) {
    String suffixedAlias = String.format("%s-%s", output.getAlias(), UUID.randomUUID());
    return output.alias(suffixedAlias);
  }
}