| /* |
| * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.test.lib.jittester; |
| |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.TreeSet; |
| import jdk.test.lib.jittester.factories.Factory; |
| import jdk.test.lib.jittester.utils.PseudoRandom; |
| |
| /** |
| * The Rule. A helper to perform production. |
| */ |
| public class Rule<T extends IRNode> extends Factory<T> implements Comparable<Rule<T>> { |
| private final String name; |
| private final TreeSet<RuleEntry> variants; |
| private Integer limit = -1; |
| |
| @Override |
| public int compareTo(Rule<T> rule) { |
| return name.compareTo(rule.name); |
| } |
| |
| public Rule(String name) { |
| this.name = name; |
| variants = new TreeSet<>(); |
| } |
| |
| public void add(String ruleName, Factory<? extends T> factory) { |
| add(ruleName, factory, 1.0); |
| } |
| |
| public void add(String ruleName, Factory<? extends T> factory, double weight) { |
| variants.add(new RuleEntry(ruleName, factory, weight)); |
| } |
| |
| public int size() { |
| return variants.size(); |
| } |
| |
| @Override |
| public T produce() throws ProductionFailedException { |
| if (!variants.isEmpty()) { |
| // Begin production. |
| LinkedList<RuleEntry> rulesList = new LinkedList<>(variants); |
| PseudoRandom.shuffle(rulesList); |
| |
| while (!rulesList.isEmpty() && (limit == -1 || limit > 0)) { |
| double sum = rulesList.stream() |
| .mapToDouble(r -> r.weight) |
| .sum(); |
| double rnd = PseudoRandom.random() * sum; |
| Iterator<RuleEntry> iterator = rulesList.iterator(); |
| RuleEntry ruleEntry; |
| double weightAccumulator = 0; |
| do { |
| ruleEntry = iterator.next(); |
| weightAccumulator += ruleEntry.weight; |
| if (weightAccumulator >= rnd) { |
| break; |
| } |
| } while (iterator.hasNext()); |
| try { |
| return ruleEntry.produce(); |
| } catch (ProductionFailedException e) { |
| } |
| iterator.remove(); |
| if (limit != -1) { |
| limit--; |
| } |
| } |
| //throw new ProductionFailedException(); |
| } |
| // should probably throw exception here.. |
| //return getChildren().size() > 0 ? getChild(0).produce() : null; |
| throw new ProductionFailedException(); |
| } |
| |
| private class RuleEntry extends Factory<T> implements Comparable<RuleEntry> { |
| private final double weight; |
| private final Factory<? extends T> factory; |
| private final String name; |
| |
| private RuleEntry(String name, Factory<? extends T> factory, double weight) { |
| this.name = name; |
| this.weight = weight; |
| this.factory = factory; |
| } |
| |
| @Override |
| public T produce() throws ProductionFailedException { |
| return factory.produce(); |
| } |
| |
| @Override |
| public int compareTo(RuleEntry entry) { |
| return name.compareTo(entry.name); |
| } |
| } |
| } |