| /* |
| * 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 org.apache.phoenix.pherf.rules; |
| |
| import org.apache.phoenix.thirdparty.com.google.common.base.Preconditions; |
| import org.apache.phoenix.pherf.configuration.Column; |
| import org.apache.phoenix.pherf.configuration.DataSequence; |
| import org.apache.phoenix.pherf.configuration.DataTypeMapping; |
| |
| import java.util.concurrent.atomic.AtomicLong; |
| |
| /** |
| * A generator to round robin thru a list of values. |
| */ |
| |
| public class SequentialListDataGenerator implements RuleBasedDataGenerator { |
| private final Column columnRule; |
| private final AtomicLong counter; |
| |
| public SequentialListDataGenerator(Column columnRule) { |
| Preconditions.checkArgument(columnRule.getDataSequence() == DataSequence.SEQUENTIAL); |
| Preconditions.checkArgument(columnRule.getDataValues().size() > 0); |
| Preconditions.checkArgument(isAllowedType(columnRule.getType())); |
| this.columnRule = columnRule; |
| counter = new AtomicLong(0); |
| } |
| |
| /** |
| * Note that this method rolls over for attempts to get larger than maxValue |
| * @return new DataValue |
| */ |
| @Override |
| public DataValue getDataValue() { |
| long pos = counter.getAndIncrement(); |
| int index = (int) pos % columnRule.getDataValues().size(); |
| return columnRule.getDataValues().get(index); |
| } |
| |
| boolean isAllowedType(DataTypeMapping mapping) { |
| // For now only varchar list are supported |
| switch (mapping) { |
| case VARCHAR: |
| case VARBINARY: |
| case CHAR: |
| return true; |
| default: |
| return false; |
| } |
| } |
| } |