1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
// (jEdit options) :folding=explicit:collapseFolds=1:
//{{{ Package, imports
//import java.awt.*;
//import java.awt.event.*;
import java.io.*;
import java.net.URL;
import java.text.DecimalFormat;
import java.util.*;
//import java.util.regex.*;
//import javax.swing.*;
//import driftwood.*;
//}}}
/**
* <code>Getters</code> is designed to test the speed of
* getters vs. direct access to member variables.
*
* Getters appear to be only ~12% slower,
* and each access takes on the order of 2 ns anyway.
*
* <p>Copyright (C) 2003 by Ian W. Davis. All rights reserved.
* <br>Begun on Fri Jul 11 10:01:13 EDT 2003
*/
public class Getters //extends ... implements ...
{
//{{{ Constants
//}}}
//{{{ Variable definitions
//##############################################################################
//}}}
//{{{ Constructor(s)
//##############################################################################
public Getters()
{
super();
}
//}}}
//{{{ CLASS: Dummy
//##############################################################################
static class Dummy
{
double v1 = 0.0;
double v2 = 1.0;
double v3 = 2.0;
double v4 = 3.14;
double v5 = 2.000000001;
double v6 = 0.6667;
double v7 = Double.NaN;
double v8 = 1e100;
double v9 = -999.999;
double v10 = 10.0;
double getValue1() { return v1; }
double getValue2() { return v2; }
double getValue3() { return v3; }
double getValue4() { return v4; }
double getValue5() { return v5; }
double getValue6() { return v6; }
double getValue7() { return v7; }
double getValue8() { return v8; }
double getValue9() { return v9; }
double getValue10() { return v10; }
}
//}}}
//{{{ Main, main
//##############################################################################
/**
* Main() function for running as an application
*/
public void Main()
{
final int reps = 1 << 27;
Dummy dummy = new Dummy();
double dval;
long time = System.currentTimeMillis();
for(int i = 0; i < reps; i++)
{
dval = dummy.v1;
dval = dummy.v2;
dval = dummy.v3;
dval = dummy.v4;
dval = dummy.v5;
dval = dummy.v6;
dval = dummy.v7;
dval = dummy.v8;
dval = dummy.v9;
dval = dummy.v10;
}
time = System.currentTimeMillis() - time;
System.err.println(reps*10+" direct accesses in "+time+" ms");
time = System.currentTimeMillis();
for(int i = 0; i < reps; i++)
{
dval = dummy.getValue1();
dval = dummy.getValue2();
dval = dummy.getValue3();
dval = dummy.getValue4();
dval = dummy.getValue5();
dval = dummy.getValue6();
dval = dummy.getValue7();
dval = dummy.getValue8();
dval = dummy.getValue9();
dval = dummy.getValue10();
}
time = System.currentTimeMillis() - time;
System.err.println(reps*10+" getter accesses in "+time+" ms");
}
public static void main(String[] args)
{
Getters mainprog = new Getters();
try
{
mainprog.parseArguments(args);
mainprog.Main();
}
catch(IllegalArgumentException ex)
{
ex.printStackTrace();
System.err.println();
mainprog.showHelp(true);
System.err.println();
System.err.println("*** Error parsing arguments: "+ex.getMessage());
System.exit(1);
}
}
//}}}
//{{{ parseArguments, showHelp
//##############################################################################
/**
* Parse the command-line options for this program.
* @param args the command-line options, as received by main()
* @throws IllegalArgumentException if any argument is unrecognized, ambiguous, missing
* a required parameter, has a malformed parameter, or is otherwise unacceptable.
*/
void parseArguments(String[] args)
{
String arg, flag, param;
boolean interpFlags = true;
for(int i = 0; i < args.length; i++)
{
arg = args[i];
if(!arg.startsWith("-") || !interpFlags || arg.equals("-"))
{
// This is probably a filename or something
interpretArg(arg);
}
else if(arg.equals("--"))
{
// Stop treating things as flags once we find --
interpFlags = false;
}
else
{
// This is a flag. It may have a param after the = sign
int eq = arg.indexOf('=');
if(eq != -1)
{
flag = arg.substring(0, eq);
param = arg.substring(eq+1);
}
else
{
flag = arg;
param = null;
}
try { interpretFlag(flag, param); }
catch(NullPointerException ex)
{ throw new IllegalArgumentException("'"+arg
+"' expects to be followed by a parameter"); }
}
}//for(each arg in args)
}
// Display help information
void showHelp(boolean showAll)
{
if(showAll)
{
InputStream is = getClass().getResourceAsStream("Getters.help");
if(is == null)
System.err.println("\n*** Unable to locate help information in 'Getters.help' ***\n");
else
{
try { streamcopy(is, System.out); }
catch(IOException ex) { ex.printStackTrace(); }
}
}
System.err.println(".Getters");
System.err.println("Copyright (C) 2003 by Ian W. Davis. All rights reserved.");
}
// Copies src to dst until we hit EOF
void streamcopy(InputStream src, OutputStream dst) throws IOException
{
byte[] buffer = new byte[2048];
int len;
while((len = src.read(buffer)) != -1) dst.write(buffer, 0, len);
}
//}}}
//{{{ interpretArg, interpretFlag
//##############################################################################
void interpretArg(String arg)
{
// Handle files, etc. here
}
void interpretFlag(String flag, String param)
{
if(flag.equals("-help") || flag.equals("-h"))
{
showHelp(true);
System.exit(0);
}
else if(flag.equals("-dummy_option"))
{
// handle option here
}
else throw new IllegalArgumentException("'"+flag+"' is not recognized as a valid flag");
}
//}}}
}//class
|
