1 /* 2 * Copyright (C) 2016 The Android Open Source Project 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 package benchmarks.regression; 17 18 import android.icu.text.TimeZoneNames; 19 20 import java.text.DateFormatSymbols; 21 import java.text.ParseException; 22 import java.text.SimpleDateFormat; 23 import java.util.Arrays; 24 import java.util.Date; 25 import java.util.Locale; 26 import java.util.TimeZone; 27 28 /** 29 * Benchmark for java.text.SimpleDateFormat. This tests common formatting, parsing and creation 30 * operations with a specific focus on TimeZone handling. 31 */ 32 public class SimpleDateFormatBenchmark { 33 public void time_createFormatWithTimeZone(int reps) { 34 for (int i = 0; i < reps; i++) { 35 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd z"); 36 } 37 } 38 39 public void time_parseWithTimeZoneShort(int reps) throws ParseException { 40 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd z"); 41 for (int i = 0; i < reps; i++) { 42 sdf.parse("2000.01.01 PST"); 43 } 44 } 45 46 public void time_parseWithTimeZoneLong(int reps) throws ParseException { 47 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd zzzz"); 48 for (int i = 0; i < reps; i++) { 49 sdf.parse("2000.01.01 Pacific Standard Time"); 50 } 51 } 52 53 public void time_parseWithoutTimeZone(int reps) throws ParseException { 54 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd"); 55 for (int i = 0; i < reps; i++) { 56 sdf.parse("2000.01.01"); 57 } 58 } 59 60 public void time_createAndParseWithTimeZoneShort(int reps) throws ParseException { 61 for (int i = 0; i < reps; i++) { 62 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd z"); 63 sdf.parse("2000.01.01 PST"); 64 } 65 } 66 67 public void time_createAndParseWithTimeZoneLong(int reps) throws ParseException { 68 for (int i = 0; i < reps; i++) { 69 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd zzzz"); 70 sdf.parse("2000.01.01 Pacific Standard Time"); 71 } 72 } 73 74 public void time_formatWithTimeZoneShort(int reps) { 75 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd z"); 76 for (int i = 0; i < reps; i++) { 77 sdf.format(new Date()); 78 } 79 } 80 81 public void time_formatWithTimeZoneLong(int reps) { 82 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd zzzz"); 83 for (int i = 0; i < reps; i++) { 84 sdf.format(new Date()); 85 } 86 } 87 88 /** 89 * Times first-time execution to measure effects of initial loading of data that's lost in 90 * full caliper benchmarks. 91 */ 92 public static void main(String[] args) throws ParseException { 93 long start, end; 94 95 Locale locale = Locale.GERMAN; 96 start = System.nanoTime(); 97 SimpleDateFormat sdf = new SimpleDateFormat("yyyy.MM.dd zzzz", locale); 98 end = System.nanoTime(); 99 System.out.printf("Creating first SDF: %,d ns\n", end-start); 100 101 // N code had special cases for currently-set and for default timezone. We want to measure 102 // the generic case. 103 sdf.setTimeZone(TimeZone.getTimeZone("Hongkong")); 104 105 start = System.nanoTime(); 106 sdf.parse("2000.1.1 Kubanische Normalzeit"); 107 end = System.nanoTime(); 108 System.out.printf("First parse: %,d ns\n", end-start); 109 110 start = System.nanoTime(); 111 sdf.format(new Date()); 112 end = System.nanoTime(); 113 System.out.printf("First format: %,d ns\n", end-start); 114 } 115 } 116
