Jesse Wilson | 1440b36 | 2009-12-15 18:54:02 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2009 Google Inc. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.google.caliper; |
| 18 | |
| 19 | import com.google.common.collect.ImmutableMap; |
| 20 | import com.google.common.collect.ImmutableSet; |
| 21 | |
| 22 | import java.lang.reflect.Method; |
| 23 | import java.lang.reflect.Modifier; |
| 24 | import java.lang.reflect.Type; |
| 25 | import java.util.Arrays; |
| 26 | import java.util.Collection; |
| 27 | import java.util.Map; |
| 28 | import java.util.Set; |
| 29 | |
| 30 | /** |
| 31 | * A convenience class for implementing benchmarks in plain code. |
| 32 | * Implementing classes must have a no-arguments constructor. |
| 33 | * |
| 34 | * <h3>Benchmarks</h3> |
| 35 | * The benchmarks of a suite are defined by . They may be |
| 36 | * static. They are not permitted to take parameters . . .. |
| 37 | * |
| 38 | * <h3>Parameters</h3> |
| 39 | * Implementing classes may be configured using parameters. Each parameter is a |
| 40 | * property of a benchmark, plus the default values that fulfill it. Parameters |
| 41 | * are specified by annotated fields: |
| 42 | * <pre> |
| 43 | * {@literal @}Param int length; |
| 44 | * </pre> |
| 45 | * The available values for a parameter are specified by another field with the |
| 46 | * same name plus the {@code Values} suffix. The type of this field must be an |
| 47 | * {@code Iterable} of the parameter's type. |
| 48 | * <pre> |
| 49 | * Iterable<Integer> lengthValues = Arrays.asList(10, 100, 1000, 10000); |
| 50 | * </pre> |
| 51 | * Alternatively, the available values may be specified with a method. The |
| 52 | * method's name follows the same naming convention and returns the same type. |
| 53 | * Such methods may not accept parameters of their own. |
| 54 | * <pre> |
| 55 | * Iterable<Integer> lengthValues() { |
| 56 | * return Arrays.asList(10, 100, 1000, 10000); |
| 57 | * } |
| 58 | * </pre> |
| 59 | */ |
| 60 | public abstract class SimpleBenchmark implements Benchmark { |
| 61 | |
| 62 | private static final Class<?>[] ARGUMENT_TYPES = { int.class }; |
| 63 | |
| 64 | private final Map<String, Parameter<?>> parameters; |
| 65 | private final Map<String, Method> methods; |
| 66 | |
| 67 | protected SimpleBenchmark() { |
| 68 | parameters = Parameter.forClass(getClass()); |
| 69 | methods = createTimedMethods(); |
| 70 | |
| 71 | if (methods.isEmpty()) { |
| 72 | throw new ConfigurationException( |
| 73 | "No benchmarks defined in " + getClass().getName()); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | protected void setUp() throws Exception {} |
| 78 | |
| 79 | public Set<String> parameterNames() { |
| 80 | return ImmutableSet.<String>builder() |
| 81 | .add("benchmark") |
| 82 | .addAll(parameters.keySet()) |
| 83 | .build(); |
| 84 | } |
| 85 | |
| 86 | public Set<String> parameterValues(String parameterName) { |
| 87 | if ("benchmark".equals(parameterName)) { |
| 88 | return methods.keySet(); |
| 89 | } |
| 90 | |
| 91 | try { |
| 92 | TypeConverter typeConverter = new TypeConverter(); |
| 93 | Parameter<?> parameter = parameters.get(parameterName); |
| 94 | if (parameter == null) { |
| 95 | throw new IllegalArgumentException(); |
| 96 | } |
| 97 | Collection<?> values = parameter.values(); |
| 98 | Type type = parameter.getType(); |
| 99 | |
| 100 | ImmutableSet.Builder<String> result = ImmutableSet.builder(); |
| 101 | for (Object value : values) { |
| 102 | result.add(typeConverter.toString(value, type)); |
| 103 | } |
| 104 | return result.build(); |
| 105 | } catch (Exception e) { |
| 106 | throw new ExecutionException(e); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | public TimedRunnable createBenchmark(Map<String, String> parameterValues) { |
| 111 | TypeConverter typeConverter = new TypeConverter(); |
| 112 | |
| 113 | if (!parameterNames().equals(parameterValues.keySet())) { |
| 114 | throw new IllegalArgumentException("Invalid parameters specified. Expected " |
| 115 | + parameterNames() + " but was " + parameterValues.keySet()); |
| 116 | } |
| 117 | |
| 118 | try { |
| 119 | final SimpleBenchmark copyOfSelf = getClass().newInstance(); |
| 120 | final Method method = methods.get(parameterValues.get("benchmark")); |
| 121 | |
| 122 | for (Map.Entry<String, String> entry : parameterValues.entrySet()) { |
| 123 | String parameterName = entry.getKey(); |
| 124 | if ("benchmark".equals(parameterName)) { |
| 125 | continue; |
| 126 | } |
| 127 | |
| 128 | Parameter parameter = parameters.get(parameterName); |
| 129 | Object value = typeConverter.fromString(entry.getValue(), parameter.getType()); |
| 130 | parameter.set(copyOfSelf, value); |
| 131 | } |
| 132 | copyOfSelf.setUp(); |
| 133 | |
| 134 | return new TimedRunnable() { |
| 135 | public Object run(int reps) throws Exception { |
| 136 | return method.invoke(copyOfSelf, reps); |
| 137 | } |
| 138 | }; |
| 139 | |
| 140 | } catch (Exception e) { |
| 141 | throw new ExecutionException(e); |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * Returns a spec for each benchmark defined in the specified class. The |
| 147 | * returned specs have no parameter values; those must be added separately. |
| 148 | */ |
| 149 | private Map<String, Method> createTimedMethods() { |
| 150 | ImmutableMap.Builder<String, Method> result = ImmutableMap.builder(); |
| 151 | for (final Method method : getClass().getDeclaredMethods()) { |
| 152 | int modifiers = method.getModifiers(); |
| 153 | if (!method.getName().startsWith("time")) { |
| 154 | continue; |
| 155 | } |
| 156 | |
| 157 | if (!Modifier.isPublic(modifiers) |
| 158 | || Modifier.isStatic(modifiers) |
| 159 | || Modifier.isAbstract(modifiers) |
| 160 | || !Arrays.equals(method.getParameterTypes(), ARGUMENT_TYPES)) { |
| 161 | throw new ConfigurationException("Timed methods must be public, " |
| 162 | + "non-static, non-abstract and take a single int parameter. " |
| 163 | + "But " + method + " violates these requirements."); |
| 164 | } |
| 165 | |
| 166 | result.put(method.getName().substring(4), method); |
| 167 | } |
| 168 | |
| 169 | return result.build(); |
| 170 | } |
| 171 | } |