WikipediaPartitioner.java

/*
 * 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 gobblin.example.wikipedia;

import gobblin.configuration.State;
import gobblin.writer.partitioner.WriterPartitioner;

import org.apache.avro.Schema;
import org.apache.avro.SchemaBuilder;
import org.apache.avro.generic.GenericData;
import org.apache.avro.generic.GenericRecord;


/**
 * Partitioner that splits records by title.
 */
public class WikipediaPartitioner implements WriterPartitioner<GenericRecord> {

  private static final String TITLE = "title";

  private static final Schema SCHEMA = SchemaBuilder.record("ArticleTitle").namespace("gobblin.example.wikipedia")
      .fields().name(TITLE).type(Schema.create(Schema.Type.STRING)).noDefault().endRecord();

  public WikipediaPartitioner(State state, int numBranches, int branchId) {}

  @Override
  public Schema partitionSchema() {
    return SCHEMA;
  }

  @Override
  public GenericRecord partitionForRecord(GenericRecord record) {
    GenericRecord partition = new GenericData.Record(SCHEMA);
    partition.put(TITLE, record.get("title"));
    return partition;
  }
}