Java tutorial
/* * Copyright (C) 2011 Google Inc. * * Licensed 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 com.google.caliper.runner; import static com.google.common.base.Preconditions.checkArgument; import com.google.common.collect.ImmutableMap; import com.google.common.collect.ImmutableSet; import com.google.common.collect.ImmutableSetMultimap; import com.google.common.collect.Lists; import com.google.common.collect.SetMultimap; import com.google.common.collect.Sets; import java.util.Collection; import java.util.Iterator; import java.util.List; import java.util.Set; /** * A set of {@link Scenario scenarios} constructed by taking all possible combinations of benchmark * methods, user parameters, VM specs and VM arguments. */ public final class FullCartesianScenarioSelection implements ScenarioSelection { private final ImmutableSet<BenchmarkMethod> benchmarkMethods; private final ImmutableSet<VirtualMachine> vms; private final ImmutableSetMultimap<String, String> userParameters; public FullCartesianScenarioSelection(Collection<BenchmarkMethod> benchmarkMethods, Collection<VirtualMachine> vms, SetMultimap<String, String> userParameters) { this.benchmarkMethods = ImmutableSet.copyOf(benchmarkMethods); this.vms = ImmutableSet.copyOf(vms); this.userParameters = ImmutableSetMultimap.copyOf(userParameters); checkArgument(!benchmarkMethods.isEmpty()); checkArgument(!vms.isEmpty()); } @Override public ImmutableSet<BenchmarkMethod> benchmarkMethods() { return benchmarkMethods; } @Override public ImmutableSet<VirtualMachine> vms() { return vms; } @Override public ImmutableSetMultimap<String, String> userParameters() { return userParameters; } @Override public ImmutableSet<Scenario> buildScenarios() { List<Scenario> tmp = Lists.newArrayList(); for (BenchmarkMethod benchmarkMethod : benchmarkMethods) { for (VirtualMachine vm : vms) { for (List<String> userParamsChoice : cartesian(userParameters)) { ImmutableMap<String, String> theseUserParams = zip(userParameters.keySet(), userParamsChoice); tmp.add(new Scenario(benchmarkMethod, theseUserParams, vm)); } } } return ImmutableSet.copyOf(tmp); } protected static <T> Set<List<T>> cartesian(SetMultimap<String, T> multimap) { @SuppressWarnings({ "unchecked", "rawtypes" }) // promised by spec ImmutableMap<String, Set<T>> paramsAsMap = (ImmutableMap) multimap.asMap(); return Sets.cartesianProduct(paramsAsMap.values().asList()); } protected static <K, V> ImmutableMap<K, V> zip(Set<K> keys, Collection<V> values) { ImmutableMap.Builder<K, V> builder = ImmutableMap.builder(); Iterator<K> keyIterator = keys.iterator(); Iterator<V> valueIterator = values.iterator(); while (keyIterator.hasNext() && valueIterator.hasNext()) { builder.put(keyIterator.next(), valueIterator.next()); } if (keyIterator.hasNext() || valueIterator.hasNext()) { throw new AssertionError(); // I really screwed up, then. } return builder.build(); } @Override public String selectionType() { return "Full cartesian product"; } }