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1 package com.protomatter.util;
2
3
52
53 import java.io.*;
54 import java.text.DecimalFormat  ;
55
56
112 public class StackTraceUtil
113 {
114 private static StackTraceUtil instance = null;
115
116 static
117 {
118 try
122 {
123 instance = (StackTraceUtil)Class.forName("com.protomatter.util.JDK14StackTraceUtil").newInstance();
124 instance.getInfo(0);
125 }
126 catch (Throwable t)
127 {
128 instance = new StackTraceUtil();
129 }
130 }
131
132
135 protected StackTraceUtil()
136 {
137 }
138
139 private static String LINE_SEP = System.getProperty("line.separator");
140
141 private static char SPACE = ' ';
142 private static char DOT = '.';
143 private static char COLON = ':';
144 private static char OPEN_P = '(';
145 private static char CLOSE_P = ')';
146
147
150 public static StackTraceInfo whereAmI()
151 {
152 return instance.getInfo(1);
153 }
154
155
160 public static StackTraceInfo whereAmI(int stackOffset)
161 {
162 return instance.getInfo(++stackOffset);
163 }
164
165 protected StackTraceInfo getInfo(int stackOffset)
166 {
167 Throwable t = new Throwable ();
168 StringWriter sw = new StringWriter(256);
169 PrintWriter pw = new PrintWriter(sw);
170 t.printStackTrace(pw);
171 String stack = sw.toString();
172
173 stackOffset++;
174
175 int start;
176 int end;
177 int dot;
178
179 String className = null;
180 String methodName = null;
181 int lineNumber = StackTraceInfo.LINE_NUMBER_UNKNOWN;
182
183 try
184 {
185 start = stack.indexOf(LINE_SEP) +1;
186 for (dot=0; dot<stackOffset; dot++)
187 {
188 start = stack.indexOf(LINE_SEP, ++start);
189 }
190 start = stack.indexOf(SPACE, start);
191 end = stack.indexOf(OPEN_P, start);
192 dot = stack.lastIndexOf(DOT, end);
193
194 className = stack.substring(++start, dot);
195 methodName = stack.substring(++dot, end);
196
197 dot = stack.indexOf(COLON, end);
199 if (dot > 0)
200 {
201 end = stack.indexOf(CLOSE_P, dot);
202 lineNumber = Integer.parseInt(stack.substring(++dot, end));
203 }
204 }
205 catch (Exception x)
206 {
207 ; }
209
210 return new StackTraceInfo(className, methodName, lineNumber);
211 }
212
213 private static class TestThread
214 extends Thread
215 {
216 private int numRuns = 0;
217 private long time = 0;
218 private StackTraceInfo info = null;
219
220 public TestThread(int runs)
221 {
222 super();
223 this.numRuns = runs;
224 }
225
226 public void run()
227 {
228 time = System.currentTimeMillis();
229 for (int i=0; i<numRuns; i++)
230 {
231 info = StackTraceUtil.whereAmI();
232 }
233 time = System.currentTimeMillis() - time;
234 }
235
236 public void info()
237 {
238 DecimalFormat format = new DecimalFormat ("####.######");
239 DecimalFormat tf = new DecimalFormat ("###,###,##0");
240 System.out.println(" " + tf.format(numRuns) + " runs in " + tf.format(time) + "ms");
241 double average = ((double)time / (double)numRuns);
242 System.out.println(" Average is " + format.format(average) + "ms");
243 System.out.println(" Stack trace info = " + info);
244 System.out.println("");
245 }
246 }
247
248
253 public static void main(String args[])
254 {
255 try
256 {
257 int numThreads = 5;
258 int numTries = 10000;
259
260 if (args.length == 2)
261 {
262 try
263 {
264 numThreads = Integer.parseInt(args[0]);
265 numTries = Integer.parseInt(args[1]);
266 }
267 catch (NumberFormatException x)
268 {
269 System.out.println("Usage: java com.protomatter.util.StackTraceUtil num-threads num-calls");
270 System.exit(0);
271 }
272 }
273 else if ((args.length == 1) || (args.length > 2))
274 {
275 System.out.println("Usage: java com.protomatter.util.StackTraceUtil num-threads num-calls");
276 System.exit(0);
277 }
278
279 DecimalFormat tf = new DecimalFormat ("###,###,##0");
280 System.out.println("StackTraceUtil.whereAmI() test:");
281 System.out.println("");
282 System.out.println("JVM Information:");
283 System.out.println(" VM Name: " + System.getProperty("java.vm.name"));
284 System.out.println(" VM Version: " + System.getProperty("java.vm.version"));
285 System.out.println(" Runtime name: " + System.getProperty("java.runtime.name"));
286 System.out.println(" Runtime version: " + System.getProperty("java.runtime.version"));
287 System.out.println("");
288 System.out.println("OS Information:");
289 System.out.println(" " + System.getProperty("os.name") + " " + System.getProperty("os.version"));
290 System.out.println("");
291 System.out.println("Creating " + numThreads + " test threads (" + tf.format(numTries) + " calls each)...");
292 TestThread threads[] = new TestThread[numThreads];
293 for (int i=0; i<numThreads; i++)
294 {
295 threads[i] = new TestThread(numTries);
296 }
297
298 System.out.println("Running test threads...");
299 long time = System.currentTimeMillis();
300 for (int i=0; i<numThreads; i++)
301 {
302 threads[i].start();
303 }
304 for (int i=0; i<numThreads; i++)
305 {
306 threads[i].join();
307 }
308 time = System.currentTimeMillis() - time;
309
310 System.out.println("Per-thread results:");
311 for (int i=0; i<numThreads; i++)
312 {
313 threads[i].info();
314 }
315
316 System.out.println("");
317 System.out.println("Overall:");
318 DecimalFormat format = new DecimalFormat ("####.######");
319 System.out.println(" " + tf.format((numThreads * numTries)) + " runs in " + tf.format(time) + "ms");
320 double average = ((double)time / (double)(numThreads * numTries));
321 System.out.println(" Average is " + format.format(average) + "ms");
322 System.out.println("");
323 }
324 catch (Exception x)
325 {
326 x.printStackTrace();
327 }
328 }
329 }
330
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