| package org.apache.cassandra.stress.generate.values; |
| /* |
| * |
| * 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. |
| * |
| */ |
| |
| |
| import org.apache.cassandra.db.marshal.AbstractType; |
| import org.apache.cassandra.stress.generate.Distribution; |
| import org.apache.cassandra.stress.generate.DistributionFactory; |
| import org.apache.cassandra.stress.settings.OptionDistribution; |
| |
| public abstract class Generator<T> |
| { |
| |
| public final String name; |
| public final AbstractType<T> type; |
| public final Class<?> clazz; |
| final long salt; |
| final Distribution identityDistribution; |
| final Distribution sizeDistribution; |
| public final Distribution clusteringDistribution; |
| |
| public Generator(AbstractType<T> type, GeneratorConfig config, String name, Class<?> clazz) |
| { |
| this.type = type; |
| this.name = name; |
| this.clazz = clazz; |
| this.salt = config.salt; |
| this.identityDistribution = config.getIdentityDistribution(defaultIdentityDistribution()); |
| this.sizeDistribution = config.getSizeDistribution(defaultSizeDistribution()); |
| this.clusteringDistribution = config.getClusteringDistribution(defaultClusteringDistribution()); |
| } |
| |
| public void setSeed(long seed) |
| { |
| identityDistribution.setSeed(seed ^ salt); |
| clusteringDistribution.setSeed(seed ^ ~salt); |
| } |
| |
| public abstract T generate(); |
| |
| DistributionFactory defaultIdentityDistribution() |
| { |
| return OptionDistribution.get("uniform(1..100B)"); |
| } |
| |
| DistributionFactory defaultSizeDistribution() |
| { |
| return OptionDistribution.get("uniform(4..8)"); |
| } |
| |
| DistributionFactory defaultClusteringDistribution() |
| { |
| return OptionDistribution.get("fixed(1)"); |
| } |
| } |