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Gobblin Ingestion Framework
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/*
 * 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.source.extractor.extract;

import gobblin.source.extractor.DataRecordException;
import gobblin.source.extractor.exception.HighWatermarkException;
import gobblin.source.extractor.watermark.Predicate;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import gobblin.source.extractor.exception.RecordCountException;
import gobblin.source.extractor.exception.SchemaException;
import gobblin.source.workunit.WorkUnit;


/**
 * An interface for source extractors
 *
 * @param  type of data record
 * @param  type of schema
 */
public interface SourceSpecificLayer {
  /**
   * Metadata to extract raw schema(like url, query)
   *
   * @param source schema name
   * @param source entity name
   * @return list of commands to get schema
   * @throws SchemaException if there is anything wrong in building metadata for schema extraction
   */
  public List getSchemaMetadata(String schema, String entity)
      throws SchemaException;

  /**
   * Raw schema from the response
   *
   * @param response is the output from a source call
   * @return S representation of the schema
   * @throws SchemaException if there is anything wrong in getting raw schema
   */
  public S getSchema(CommandOutput response)
      throws SchemaException, IOException;

  /**
   * Metadata for high watermark(like url, query)
   *
   * @param source schema name
   * @param source entity name
   * @param water mark column
   * @param lis of all predicates that needs to be applied
   * @return list of commands to get the high watermark
   * @throws gobblin.source.extractor.exception.HighWatermarkException if there is anything wrong in building metadata to get high watermark
   */
  public List getHighWatermarkMetadata(String schema, String entity, String watermarkColumn,
      List predicateList)
      throws HighWatermarkException;

  /**
   * High watermark from the response
   *
   * @param source schema name
   * @param source entity name
   * @param water mark column
   * @param lis of all predicates that needs to be applied
   * @return high water mark from source
   * @throws HighWatermarkException if there is anything wrong in building metadata to get high watermark
   */
  public long getHighWatermark(CommandOutput response, String watermarkColumn, String predicateColumnFormat)
      throws HighWatermarkException;

  /**
   * Metadata for record count(like url, query)
   *
   * @param source schema name
   * @param source entity name
   * @param work unit: properties
   * @param lis of all predicates that needs to be applied
   * @return list of commands to get the count
   * @throws RecordCountException if there is anything wrong in building metadata for record counts
   */
  public List getCountMetadata(String schema, String entity, WorkUnit workUnit, List predicateList)
      throws RecordCountException;

  /**
   * Record count from the response
   *
   * @return record count
   * @throws RecordCountException if there is anything wrong in getting record count
   */
  public long getCount(CommandOutput response)
      throws RecordCountException;

  /**
   * Metadata for data records(like url, query)
   *
   * @param source schema name
   * @param source entity name
   * @param work unit: properties
   * @param list of all predicates that needs to be applied
   * @return list of commands to get the data
   * @throws gobblin.source.extractor.DataRecordException if there is anything wrong in building metadata for data records
   */
  public List getDataMetadata(String schema, String entity, WorkUnit workUnit, List predicateList)
      throws DataRecordException;

  /**
   * Set of data records from the response
   *
   * @return Iterator over objects of type D
   * @throws DataRecordException if there is anything wrong in getting data records
   */
  public Iterator getData(CommandOutput response)
      throws DataRecordException, IOException;

  /**
   * Data type of source
   *
   * @return Map of source and target data types
   */
  public Map getDataTypeMap();

  /**
   * Get records using source specific api (Example: bulk api in salesforce source)
   * record set: data records with an iterator
   *
   * @param source schema name
   * @param source entity name
   * @param work unit: properties
   * @param list of all predicates that needs to be applied
   * @return iterator with set of records
   * @throws SchemaException if there is anything wrong in getting data records
   */
  public Iterator getRecordSetFromSourceApi(String schema, String entity, WorkUnit workUnit,
      List predicateList)
      throws IOException;
}