gobblin.example.wikipedia.WikipediaSource Maven / Gradle / Ivy

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Gobblin Ingestion Framework

There is a newer version: 0.11.0

/*
 * Copyright (C) 2014-2016 LinkedIn Corp. All rights reserved.
 *
 * 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.
 */

package gobblin.example.wikipedia;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import com.google.gson.JsonElement;

import gobblin.configuration.ConfigurationKeys;
import gobblin.configuration.SourceState;
import gobblin.configuration.WorkUnitState;
import gobblin.source.Source;
import gobblin.source.extractor.Extractor;
import gobblin.source.extractor.extract.AbstractSource;
import gobblin.source.workunit.Extract;
import gobblin.source.workunit.WorkUnit;
import gobblin.source.workunit.Extract.TableType;


/**
 * An implementation of {@link Source} for the Wikipedia example.
 *
 * 
 *   This source creates a {@link gobblin.source.workunit.WorkUnit}, and uses
 *   {@link WikipediaExtractor} to pull the data from Wikipedia.
 * 
 *
 * @author ziliu
 */
public class WikipediaSource extends AbstractSource {

  @Override
  public List getWorkunits(SourceState state) {
    Extract extract = createExtract(TableType.SNAPSHOT_ONLY,
        state.getProp(ConfigurationKeys.EXTRACT_NAMESPACE_NAME_KEY), "WikipediaOutput");

    WorkUnit workUnit = WorkUnit.create(extract);
    return Arrays.asList(workUnit);
  }

  @Override
  public Extractor getExtractor(WorkUnitState state) throws IOException {
    return new WikipediaExtractor(state);
  }

  @Override
  public void shutdown(SourceState state) {
    //nothing to do
  }
}