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866e5b51 FC |
1 | /******************************************************************************* |
2 | * Copyright (c) 2011-2012 Ericsson, Ecole Polytechnique de Montreal and others | |
3 | * | |
4 | * All rights reserved. This program and the accompanying materials are made | |
5 | * available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | * | |
9 | * Contributors: Matthew Khouzam - Initial API and implementation | |
10 | * Contributors: Simon Marchi - Initial API and implementation | |
11 | *******************************************************************************/ | |
12 | ||
13 | package org.eclipse.linuxtools.ctf.core.trace; | |
14 | ||
ce2388e0 | 15 | import java.nio.ByteOrder; |
866e5b51 FC |
16 | |
17 | import org.eclipse.linuxtools.ctf.core.event.EventDefinition; | |
18 | import org.eclipse.linuxtools.ctf.core.event.types.StructDefinition; | |
ce2388e0 FC |
19 | import org.eclipse.linuxtools.internal.ctf.core.trace.StreamInput; |
20 | import org.eclipse.linuxtools.internal.ctf.core.trace.StreamInputPacketIndexEntry; | |
866e5b51 FC |
21 | |
22 | /** | |
23 | * <b><u>StreamInputReader</u></b> | |
24 | * <p> | |
25 | * Reads the events of a trace file. | |
26 | */ | |
27 | public class StreamInputReader { | |
28 | ||
29 | // ------------------------------------------------------------------------ | |
30 | // Attributes | |
31 | // ------------------------------------------------------------------------ | |
32 | ||
33 | /** | |
34 | * The StreamInput we are reading. | |
35 | */ | |
36 | private final StreamInput streamInput; | |
37 | ||
38 | /** | |
39 | * The packet reader used to read packets from this trace file. | |
40 | */ | |
41 | private final StreamInputPacketReader packetReader; | |
42 | ||
43 | /** | |
44 | * Iterator on the packet index | |
45 | */ | |
bfe038ff | 46 | private int packetIndex; |
866e5b51 FC |
47 | |
48 | /** | |
49 | * Reference to the current event of this trace file (iow, the last on that | |
50 | * was read, the next one to be returned) | |
51 | */ | |
52 | private EventDefinition currentEvent = null; | |
53 | ||
54 | private int name; | |
55 | ||
bfe038ff MK |
56 | private CTFTraceReader parent; |
57 | ||
58 | private final long prevIndex; | |
59 | ||
866e5b51 FC |
60 | // ------------------------------------------------------------------------ |
61 | // Constructors | |
62 | // ------------------------------------------------------------------------ | |
63 | ||
64 | /** | |
65 | * Constructs a StreamInputReader that reads a StreamInput. | |
66 | * | |
67 | * @param streamInput | |
68 | * The StreamInput to read. | |
69 | */ | |
70 | public StreamInputReader(StreamInput streamInput) { | |
71 | this.streamInput = streamInput; | |
72 | this.packetReader = new StreamInputPacketReader(this); | |
866e5b51 FC |
73 | /* |
74 | * Get the iterator on the packet index. | |
75 | */ | |
bfe038ff | 76 | this.packetIndex = 0; |
866e5b51 | 77 | |
bfe038ff | 78 | this.prevIndex = 0; |
866e5b51 FC |
79 | /* |
80 | * Make first packet the current one. | |
81 | */ | |
82 | goToNextPacket(); | |
83 | } | |
84 | ||
85 | // ------------------------------------------------------------------------ | |
86 | // Getters/Setters/Predicates | |
87 | // ------------------------------------------------------------------------ | |
88 | ||
9ac2eb62 MK |
89 | /** |
90 | * Gets the current event in this stream | |
91 | * | |
92 | * @return the current event in the stream, null if the stream is | |
93 | * finished/empty/malformed | |
94 | */ | |
866e5b51 FC |
95 | public EventDefinition getCurrentEvent() { |
96 | return this.currentEvent; | |
97 | } | |
98 | ||
9ac2eb62 MK |
99 | /** |
100 | * gets the current packet context | |
101 | * | |
102 | * @return the current packet context (size, lost events and such) | |
103 | */ | |
866e5b51 FC |
104 | public StructDefinition getCurrentPacketContext() { |
105 | return this.packetReader.getStreamPacketContextDef(); | |
106 | } | |
107 | ||
9ac2eb62 MK |
108 | /** |
109 | * Gets the byte order for a trace | |
110 | * | |
111 | * @return the trace byte order | |
112 | */ | |
ce2388e0 FC |
113 | public ByteOrder getByteOrder() { |
114 | return streamInput.getStream().getTrace().getByteOrder(); | |
866e5b51 FC |
115 | } |
116 | ||
9ac2eb62 MK |
117 | /** |
118 | * Gets the name of the stream (it's an id and a number) | |
119 | * | |
120 | * @return gets the stream name (it's a number) | |
121 | */ | |
866e5b51 FC |
122 | public int getName() { |
123 | return this.name; | |
124 | } | |
125 | ||
9ac2eb62 MK |
126 | /** |
127 | * Sets the name of the stream | |
128 | * | |
129 | * @param name | |
130 | * the name of the stream, (it's a number) | |
131 | */ | |
866e5b51 FC |
132 | public void setName(int name) { |
133 | this.name = name; | |
134 | } | |
135 | ||
9ac2eb62 MK |
136 | /** |
137 | * Gets the CPU of a stream. It's the same as the one in /proc or running | |
138 | * the asm CPUID instruction | |
139 | * | |
140 | * @return The CPU id (a number) | |
141 | */ | |
866e5b51 FC |
142 | public int getCPU() { |
143 | return this.packetReader.getCPU(); | |
144 | } | |
145 | ||
9ac2eb62 MK |
146 | /** |
147 | * Gets the filename of the stream being read | |
148 | * @return The filename of the stream being read | |
149 | */ | |
ce2388e0 FC |
150 | public String getFilename() { |
151 | return streamInput.getFilename(); | |
152 | } | |
153 | ||
154 | /* | |
155 | * for internal use only | |
156 | */ | |
157 | StreamInput getStreamInput() { | |
158 | return streamInput; | |
159 | } | |
160 | ||
866e5b51 FC |
161 | // ------------------------------------------------------------------------ |
162 | // Operations | |
163 | // ------------------------------------------------------------------------ | |
164 | /** | |
165 | * Reads the next event in the current event variable. | |
166 | * | |
167 | * @return If an event has been successfully read. | |
168 | */ | |
169 | public boolean readNextEvent() { | |
bfe038ff | 170 | |
866e5b51 FC |
171 | /* |
172 | * Change packet if needed | |
173 | */ | |
174 | if (!this.packetReader.hasMoreEvents()) { | |
bfe038ff MK |
175 | final StreamInputPacketIndexEntry prevPacket = this.packetReader |
176 | .getCurrentPacket(); | |
177 | if (prevPacket != null) { | |
178 | goToNextPacket(); | |
179 | final StreamInputPacketIndexEntry currentPacket = this.packetReader | |
180 | .getCurrentPacket(); | |
181 | } | |
866e5b51 FC |
182 | } |
183 | ||
9ac2eb62 | 184 | /*autogenerate javadoc getter setter |
866e5b51 FC |
185 | * If an event is available, read it. |
186 | */ | |
187 | if (this.packetReader.hasMoreEvents()) { | |
188 | try { | |
189 | this.setCurrentEvent(this.packetReader.readNextEvent()); | |
190 | } catch (CTFReaderException e) { | |
bfe038ff MK |
191 | /* |
192 | * Some problem happened, we'll assume that there are no more | |
193 | * events | |
194 | */ | |
866e5b51 FC |
195 | return false; |
196 | } | |
197 | return true; | |
198 | } | |
199 | this.setCurrentEvent(null); | |
200 | return false; | |
201 | } | |
202 | ||
203 | /** | |
204 | * Change the current packet of the packet reader to the next one. | |
205 | */ | |
206 | private void goToNextPacket() { | |
bfe038ff MK |
207 | packetIndex++; |
208 | if (getPacketSize() >= (packetIndex + 1)) { | |
209 | this.packetReader.setCurrentPacket(getPacket()); | |
866e5b51 | 210 | } else { |
bfe038ff MK |
211 | try { |
212 | if (this.streamInput.addPacketHeaderIndex()) { | |
213 | packetIndex = getPacketSize() - 1; | |
214 | this.packetReader.setCurrentPacket(getPacket()); | |
215 | ||
216 | } else { | |
217 | this.packetReader.setCurrentPacket(null); | |
218 | } | |
219 | ||
220 | } catch (CTFReaderException e) { | |
221 | this.packetReader.setCurrentPacket(null); | |
222 | } | |
866e5b51 FC |
223 | } |
224 | } | |
225 | ||
bfe038ff MK |
226 | /** |
227 | * @return | |
228 | */ | |
229 | private int getPacketSize() { | |
230 | return streamInput.getIndex().getEntries().size(); | |
231 | } | |
232 | ||
866e5b51 FC |
233 | /** |
234 | * Changes the location of the trace file reader so that the current event | |
235 | * is the first event with a timestamp greater than the given timestamp. | |
236 | * | |
237 | * @param timestamp | |
238 | * The timestamp to seek to. | |
be6df2d8 | 239 | * @return The offset compared to the current position |
866e5b51 | 240 | */ |
ce2388e0 FC |
241 | public long seek(long timestamp) { |
242 | long offset = 0; | |
866e5b51 | 243 | |
eb94f9c9 | 244 | gotoPacket(timestamp); |
866e5b51 | 245 | |
0c59c1a6 MK |
246 | /* |
247 | * index up to the desired timestamp. | |
248 | */ | |
249 | while ((this.packetReader.getCurrentPacket() != null) | |
250 | && (this.packetReader.getCurrentPacket().getTimestampEnd() < timestamp)) { | |
251 | try { | |
252 | this.streamInput.addPacketHeaderIndex(); | |
253 | goToNextPacket(); | |
254 | } catch (CTFReaderException e) { | |
255 | // do nothing here | |
256 | } | |
257 | } | |
9ac2eb62 | 258 | if (this.packetReader.getCurrentPacket() == null) { |
eb94f9c9 MK |
259 | gotoPacket(timestamp); |
260 | } | |
0c59c1a6 | 261 | |
866e5b51 FC |
262 | /* |
263 | * Advance until A. we reached the end of the trace file (which means | |
264 | * the given timestamp is after the last event), or B. we found the | |
265 | * first event with a timestamp greater than the given timestamp. | |
266 | */ | |
267 | readNextEvent(); | |
268 | boolean done = (this.getCurrentEvent() == null); | |
aa572e22 | 269 | while (!done && (this.getCurrentEvent().getTimestamp() < timestamp)) { |
866e5b51 FC |
270 | readNextEvent(); |
271 | done = (this.getCurrentEvent() == null); | |
ce2388e0 | 272 | offset++; |
866e5b51 | 273 | } |
ce2388e0 FC |
274 | return offset; |
275 | } | |
276 | ||
eb94f9c9 MK |
277 | /** |
278 | * @param timestamp | |
279 | */ | |
280 | private void gotoPacket(long timestamp) { | |
281 | this.packetIndex = this.streamInput.getIndex().search(timestamp) | |
282 | .previousIndex(); | |
283 | /* | |
284 | * Switch to this packet. | |
285 | */ | |
286 | goToNextPacket(); | |
287 | } | |
288 | ||
9ac2eb62 MK |
289 | /** |
290 | * Seeks the last event of a stream and returns it. | |
291 | */ | |
bfe038ff | 292 | public void goToLastEvent() { |
866e5b51 FC |
293 | /* |
294 | * Search in the index for the packet to search in. | |
295 | */ | |
ec6f5beb MK |
296 | final int len = this.streamInput.getIndex().getEntries().size(); |
297 | ||
298 | StreamInputPacketIndexEntry entry = null; | |
866e5b51 | 299 | /* |
ec6f5beb | 300 | * Go to beginning of trace. |
866e5b51 | 301 | */ |
ec6f5beb MK |
302 | seek(0); |
303 | /* | |
304 | * if the trace is empty. | |
305 | */ | |
bfe038ff | 306 | if ((len == 0) || (this.packetReader.hasMoreEvents() == false)) { |
ec6f5beb MK |
307 | /* |
308 | * This means the trace is empty. abort. | |
309 | */ | |
310 | return; | |
ce2388e0 | 311 | } |
ec6f5beb MK |
312 | /* |
313 | * Go to the last packet that contains events. | |
314 | */ | |
bfe038ff MK |
315 | for (int pos = len - 1; pos > 0; pos--) { |
316 | packetIndex = pos; | |
317 | this.packetReader.setCurrentPacket(getPacket()); | |
318 | if (this.packetReader.hasMoreEvents()) { | |
ec6f5beb MK |
319 | break; |
320 | } | |
866e5b51 | 321 | } |
ec6f5beb MK |
322 | |
323 | /* | |
324 | * Go until the end of that packet | |
325 | */ | |
326 | EventDefinition prevEvent = null; | |
327 | while (this.currentEvent != null) { | |
328 | prevEvent = this.currentEvent; | |
329 | this.readNextEvent(); | |
330 | } | |
331 | /* | |
332 | * Go back to the previous event | |
333 | */ | |
334 | this.setCurrentEvent(prevEvent); | |
866e5b51 FC |
335 | } |
336 | ||
bfe038ff MK |
337 | /** |
338 | * @return the parent | |
339 | */ | |
340 | public CTFTraceReader getParent() { | |
341 | return parent; | |
342 | } | |
343 | ||
344 | /** | |
345 | * @param parent | |
346 | * the parent to set | |
347 | */ | |
348 | public void setParent(CTFTraceReader parent) { | |
349 | this.parent = parent; | |
350 | } | |
351 | ||
9ac2eb62 MK |
352 | /** |
353 | * Sets the current event in a stream input reader | |
354 | * @param currentEvent the event to set | |
355 | */ | |
866e5b51 FC |
356 | public void setCurrentEvent(EventDefinition currentEvent) { |
357 | this.currentEvent = currentEvent; | |
358 | } | |
359 | ||
ce2388e0 FC |
360 | /** |
361 | * @return the packetIndexIt | |
362 | */ | |
bfe038ff MK |
363 | private int getPacketIndex() { |
364 | return packetIndex; | |
365 | } | |
366 | ||
367 | private StreamInputPacketIndexEntry getPacket() { | |
368 | return streamInput.getIndex().getEntries().get(getPacketIndex()); | |
ce2388e0 FC |
369 | } |
370 | ||
371 | /** | |
372 | * @return the packetReader | |
373 | */ | |
374 | public StreamInputPacketReader getPacketReader() { | |
375 | return packetReader; | |
376 | } | |
377 | ||
bfe038ff MK |
378 | /* |
379 | * (non-Javadoc) | |
380 | * | |
81c8e6f7 MK |
381 | * @see java.lang.Object#hashCode() |
382 | */ | |
383 | @Override | |
384 | public int hashCode() { | |
385 | final int prime = 31; | |
386 | int result = 1; | |
387 | result = (prime * result) + name; | |
388 | result = (prime * result) | |
389 | + ((streamInput == null) ? 0 : streamInput.hashCode()); | |
390 | return result; | |
391 | } | |
392 | ||
bfe038ff MK |
393 | /* |
394 | * (non-Javadoc) | |
395 | * | |
81c8e6f7 MK |
396 | * @see java.lang.Object#equals(java.lang.Object) |
397 | */ | |
398 | @Override | |
399 | public boolean equals(Object obj) { | |
400 | if (this == obj) { | |
401 | return true; | |
402 | } | |
403 | if (obj == null) { | |
404 | return false; | |
405 | } | |
406 | if (!(obj instanceof StreamInputReader)) { | |
407 | return false; | |
408 | } | |
409 | StreamInputReader other = (StreamInputReader) obj; | |
410 | if (name != other.name) { | |
411 | return false; | |
412 | } | |
413 | if (streamInput == null) { | |
414 | if (other.streamInput != null) { | |
415 | return false; | |
416 | } | |
417 | } else if (!streamInput.equals(other.streamInput)) { | |
418 | return false; | |
419 | } | |
420 | return true; | |
421 | } | |
422 | ||
866e5b51 | 423 | } |