| /* |
| * 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.gson.metrics; |
| |
| import java.io.IOException; |
| import java.io.StringReader; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Type; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import com.google.caliper.Runner; |
| import com.google.caliper.SimpleBenchmark; |
| import com.google.gson.Gson; |
| import com.google.gson.reflect.TypeToken; |
| import com.google.gson.stream.JsonReader; |
| |
| /** |
| * Caliper based micro benchmarks for Gson |
| * |
| * @author Inderjeet Singh |
| */ |
| public class CollectionsDeserializationBenchmark extends SimpleBenchmark { |
| |
| private static final Type LIST_TYPE = new TypeToken<List<BagOfPrimitives>>(){}.getType(); |
| private Gson gson; |
| private String json; |
| |
| public static void main(String[] args) { |
| Runner.main(CollectionsDeserializationBenchmark.class, args); |
| } |
| |
| @Override |
| protected void setUp() throws Exception { |
| this.gson = new Gson(); |
| List<BagOfPrimitives> bags = new ArrayList<BagOfPrimitives>(); |
| for (int i = 0; i < 100; ++i) { |
| bags.add(new BagOfPrimitives(10L, 1, false, "foo")); |
| } |
| this.json = gson.toJson(bags, LIST_TYPE); |
| } |
| |
| /** |
| * Benchmark to measure Gson performance for deserializing an object |
| */ |
| public void timeCollectionsDefault(int reps) { |
| for (int i=0; i<reps; ++i) { |
| gson.fromJson(json, LIST_TYPE); |
| } |
| } |
| |
| /** |
| * Benchmark to measure deserializing objects by hand |
| */ |
| public void timeCollectionsStreaming(int reps) throws IOException { |
| for (int i=0; i<reps; ++i) { |
| StringReader reader = new StringReader(json); |
| JsonReader jr = new JsonReader(reader); |
| jr.beginArray(); |
| List<BagOfPrimitives> bags = new ArrayList<BagOfPrimitives>(); |
| while(jr.hasNext()) { |
| jr.beginObject(); |
| long longValue = 0; |
| int intValue = 0; |
| boolean booleanValue = false; |
| String stringValue = null; |
| while(jr.hasNext()) { |
| String name = jr.nextName(); |
| if (name.equals("longValue")) { |
| longValue = jr.nextLong(); |
| } else if (name.equals("intValue")) { |
| intValue = jr.nextInt(); |
| } else if (name.equals("booleanValue")) { |
| booleanValue = jr.nextBoolean(); |
| } else if (name.equals("stringValue")) { |
| stringValue = jr.nextString(); |
| } else { |
| throw new IOException("Unexpected name: " + name); |
| } |
| } |
| jr.endObject(); |
| bags.add(new BagOfPrimitives(longValue, intValue, booleanValue, stringValue)); |
| } |
| jr.endArray(); |
| } |
| } |
| |
| /** |
| * This benchmark measures the ideal Gson performance: the cost of parsing a JSON stream and |
| * setting object values by reflection. We should strive to reduce the discrepancy between this |
| * and {@link #timeCollectionsDefault(int)} . |
| */ |
| public void timeCollectionsReflectionStreaming(int reps) throws Exception { |
| for (int i=0; i<reps; ++i) { |
| StringReader reader = new StringReader(json); |
| JsonReader jr = new JsonReader(reader); |
| jr.beginArray(); |
| List<BagOfPrimitives> bags = new ArrayList<BagOfPrimitives>(); |
| while(jr.hasNext()) { |
| jr.beginObject(); |
| BagOfPrimitives bag = new BagOfPrimitives(); |
| while(jr.hasNext()) { |
| String name = jr.nextName(); |
| for (Field field : BagOfPrimitives.class.getDeclaredFields()) { |
| if (field.getName().equals(name)) { |
| Class<?> fieldType = field.getType(); |
| if (fieldType.equals(long.class)) { |
| field.setLong(bag, jr.nextLong()); |
| } else if (fieldType.equals(int.class)) { |
| field.setInt(bag, jr.nextInt()); |
| } else if (fieldType.equals(boolean.class)) { |
| field.setBoolean(bag, jr.nextBoolean()); |
| } else if (fieldType.equals(String.class)) { |
| field.set(bag, jr.nextString()); |
| } else { |
| throw new RuntimeException("Unexpected: type: " + fieldType + ", name: " + name); |
| } |
| } |
| } |
| } |
| jr.endObject(); |
| bags.add(bag); |
| } |
| jr.endArray(); |
| } |
| } |
| } |