/* * * 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.cassandra.stress.generate.values; import org.apache.cassandra.db.marshal.UTF8Type; import org.apache.cassandra.stress.generate.FasterRandom; public class Strings extends Generator<String> { private final char[] chars; private final FasterRandom rnd = new FasterRandom(); public Strings(String name, GeneratorConfig config) { super(UTF8Type.instance, config, name, String.class); chars = new char[(int) sizeDistribution.maxValue()]; } @Override public String generate() { long seed = identityDistribution.next(); sizeDistribution.setSeed(seed); rnd.setSeed(~seed); int size = (int) sizeDistribution.next(); for (int i = 0; i < size; ) for (long v = rnd.nextLong(), n = Math.min(size - i, Long.SIZE/Byte.SIZE); n-- > 0; v >>= Byte.SIZE) chars[i++] = (char) (((v & 127) + 32) & 127); return new String(chars, 0, size); } }