src/main/java/org/apache/accumulo/testing/stress/RandomMutations.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
 *
 *   https://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
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package org.apache.accumulo.testing.stress;

import org.apache.accumulo.core.data.Mutation;

public class RandomMutations extends Stream<Mutation> {
  private final RandomByteArrays rows, column_families, column_qualifiers, values;
  private final RandomWithinRange row_widths;
  private final int max_cells_per_mutation;
  private byte[] current_row;
  private int cells_remaining_in_row;

  public RandomMutations(RandomByteArrays rows, RandomByteArrays column_families,
      RandomByteArrays column_qualifiers, RandomByteArrays values, RandomWithinRange row_widths,
      int max_cells_per_mutation) {
    this.rows = rows;
    this.column_families = column_families;
    this.column_qualifiers = column_qualifiers;
    this.values = values;
    this.row_widths = row_widths;
    this.max_cells_per_mutation =
        (max_cells_per_mutation > 0 ? max_cells_per_mutation : Integer.MAX_VALUE);

    current_row = null;
    cells_remaining_in_row = 0;
  }

  // TODO should we care about timestamps?
  @Override
  public Mutation next() {
    if (cells_remaining_in_row == 0) {
      current_row = rows.next();
      cells_remaining_in_row = row_widths.next();
    }
    Mutation m = new Mutation(current_row);
    final int cells = Math.min(cells_remaining_in_row, max_cells_per_mutation);
    for (int i = 1; i <= cells; i++) {
      m.put(column_families.next(), column_qualifiers.next(), values.next());
    }
    cells_remaining_in_row -= cells;
    return m;
  }
}