| /* |
| * 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.simulator; |
| |
| import java.util.concurrent.atomic.AtomicInteger; |
| import java.util.concurrent.atomic.AtomicLong; |
| import java.util.function.Consumer; |
| |
| import org.apache.cassandra.simulator.utils.KindOfSequence; |
| |
| public abstract class RunnableActionScheduler implements Consumer<Action> |
| { |
| public enum Kind { RANDOM_WALK, UNIFORM, SEQUENTIAL } |
| |
| public static class Immediate extends RunnableActionScheduler |
| { |
| private final AtomicLong id = new AtomicLong(); |
| |
| public Immediate() { } |
| |
| @Override |
| public double priority() |
| { |
| return id.incrementAndGet(); |
| } |
| } |
| |
| public static class Sequential extends RunnableActionScheduler |
| { |
| final AtomicInteger next = new AtomicInteger(); |
| |
| @Override |
| public double priority() |
| { |
| return next.incrementAndGet(); |
| } |
| |
| public Sequential() { } |
| } |
| |
| public abstract static class AbstractRandom extends RunnableActionScheduler |
| { |
| protected final RandomSource random; |
| |
| public AbstractRandom(RandomSource random) |
| { |
| this.random = random; |
| } |
| } |
| |
| public static class RandomUniform extends AbstractRandom |
| { |
| final double min, range; |
| |
| RandomUniform(RandomSource random, double min, double range) |
| { |
| super(random); |
| this.min = min; |
| this.range = range; |
| } |
| |
| public RandomUniform(RandomSource random) |
| { |
| this(random, 0d, 1d); |
| } |
| |
| @Override |
| public double priority() |
| { |
| return min + random.uniformDouble() * range; |
| } |
| } |
| |
| static class RandomWalk extends AbstractRandom |
| { |
| final double maxStepSize; |
| double cur; |
| |
| @Override |
| public double priority() |
| { |
| double result = cur; |
| double step = 2 * (random.uniformDouble() - 1f) * maxStepSize; |
| this.cur = step > 0 ? Math.min(1d, cur + step) |
| : Math.max(0d, cur + step); |
| return result; |
| } |
| |
| @Override |
| protected RunnableActionScheduler next() |
| { |
| return new RunnableActionScheduler.RandomWalk(random, cur); |
| } |
| |
| RandomWalk(RandomSource random, double cur) |
| { |
| super(random); |
| this.maxStepSize = KindOfSequence.maxStepSize(0f, 1f, random); |
| this.cur = cur; |
| } |
| |
| RandomWalk(RandomSource random) |
| { |
| this(random, 0.5d); |
| } |
| } |
| |
| public abstract double priority(); |
| |
| protected RunnableActionScheduler next() |
| { |
| return this; |
| } |
| |
| public void attachTo(ActionList actions) |
| { |
| actions.forEach(next()); |
| } |
| |
| @Override |
| public void accept(Action action) |
| { |
| action.setScheduler(this); |
| } |
| } |