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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.policies.count;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import gobblin.configuration.ConfigurationKeys;
import gobblin.configuration.State;
import gobblin.qualitychecker.task.TaskLevelPolicy;


public class RowCountRangePolicy extends TaskLevelPolicy {
  private final long rowsRead;
  private final long rowsWritten;
  private final double range;

  private static final Logger LOG = LoggerFactory.getLogger(RowCountRangePolicy.class);

  public RowCountRangePolicy(State state, Type type) {
    super(state, type);
    this.rowsRead = state.getPropAsLong(ConfigurationKeys.EXTRACTOR_ROWS_EXPECTED);
    this.rowsWritten = state.getPropAsLong(ConfigurationKeys.WRITER_ROWS_WRITTEN);
    this.range = state.getPropAsDouble(ConfigurationKeys.ROW_COUNT_RANGE);
  }

  @Override
  public Result executePolicy() {
    double computedRange = Math.abs((this.rowsWritten - this.rowsRead) / (double)this.rowsRead);
    if (computedRange <= this.range) {
      return Result.PASSED;
    } else {

      LOG.error(String
          .format(
              "RowCountRangePolicy check failed. Rows read %s, Rows written %s, computed range %s, expected range %s ",
              this.rowsRead, this.rowsWritten, computedRange, this.range));

      return Result.FAILED;
    }
  }
}