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c392540b | 1 | /******************************************************************************* |
11252342 | 2 | * Copyright (c) 2011, 2013 Ericsson |
bfe038ff | 3 | * |
c392540b FC |
4 | * All rights reserved. This program and the accompanying materials are |
5 | * made 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 | |
bfe038ff | 8 | * |
c392540b FC |
9 | * Contributors: |
10 | * Francois Chouinard - Initial API and implementation | |
bfe038ff | 11 | * Bernd Hufmann - Implementation of new interfaces/listeners and support for |
fbd124dd | 12 | * time stamp in any order |
e0752744 | 13 | * Francois Chouinard - Moved from LTTng to TMF |
00419b1f | 14 | * Francois Chouinard - Added support for empty initial buckets |
c392540b FC |
15 | *******************************************************************************/ |
16 | ||
e0752744 | 17 | package org.eclipse.linuxtools.tmf.ui.views.histogram; |
c392540b FC |
18 | |
19 | import java.util.Arrays; | |
20 | ||
fbd124dd | 21 | import org.eclipse.core.runtime.ListenerList; |
c392540b FC |
22 | |
23 | /** | |
b544077e | 24 | * Histogram-independent data model. |
f8177ba2 | 25 | * |
b544077e | 26 | * It has the following characteristics: |
c392540b FC |
27 | * <ul> |
28 | * <li>The <i>basetime</i> is the timestamp of the first event | |
29 | * <li>There is a fixed number (<i>n</i>) of buckets of uniform duration | |
30 | * (<i>d</i>) | |
31 | * <li>The <i>timespan</i> of the model is thus: <i>n</i> * <i>d</i> time units | |
32 | * <li>Bucket <i>i</i> holds the number of events that occurred in time range: | |
33 | * [<i>basetime</i> + <i>i</i> * <i>d</i>, <i>basetime</i> + (<i>i</i> + 1) * | |
34 | * <i>d</i>) | |
35 | * </ul> | |
36 | * Initially, the bucket durations is set to 1ns. As the events are read, they | |
37 | * are tallied (using <i>countEvent()</i>) in the appropriate bucket (relative | |
38 | * to the <i>basetime</i>). | |
39 | * <p> | |
40 | * Eventually, an event will have a timestamp that exceeds the <i>timespan</i> | |
41 | * high end (determined by <i>n</i>, the number of buckets, and <i>d</i>, the | |
42 | * bucket duration). At this point, the histogram needs to be compacted. This is | |
43 | * done by simply merging adjacent buckets by pair, in effect doubling the | |
44 | * <i>timespan</i> (<i>timespan'</i> = <i>n</i> * <i>d'</i>, where <i>d'</i> = | |
45 | * 2<i>d</i>). This compaction happens as needed as the trace is read. | |
46 | * <p> | |
fbd124dd | 47 | * The model allows for timestamps in not increasing order. The timestamps can |
bfe038ff | 48 | * be fed to the model in any order. If an event has a timestamp less than the |
fbd124dd | 49 | * <i>basetime</i>, the buckets will be moved to the right to account for the |
bfe038ff | 50 | * new smaller timestamp. The new <i>basetime</i> is a multiple of the bucket |
fbd124dd BH |
51 | * duration smaller then the previous <i>basetime</i>. Note that the <i>basetime</i> |
52 | * might not be anymore a timestamp of an event. If necessary, the buckets will | |
bfe038ff | 53 | * be compacted before moving to the right. This might be necessary to not |
fbd124dd BH |
54 | * loose any event counts at the end of the buckets array. |
55 | * <p> | |
c392540b FC |
56 | * The mapping from the model to the UI is performed by the <i>scaleTo()</i> |
57 | * method. By keeping the number of buckets <i>n</i> relatively large with | |
58 | * respect to to the number of pixels in the actual histogram, we should achieve | |
59 | * a nice result when visualizing the histogram. | |
60 | * <p> | |
f8177ba2 | 61 | * |
00419b1f | 62 | * @version 2.0 |
b544077e | 63 | * @author Francois Chouinard |
c392540b | 64 | */ |
fbd124dd | 65 | public class HistogramDataModel implements IHistogramDataModel { |
c392540b FC |
66 | |
67 | // ------------------------------------------------------------------------ | |
68 | // Constants | |
69 | // ------------------------------------------------------------------------ | |
70 | ||
b544077e BH |
71 | /** |
72 | * The default number of buckets | |
73 | */ | |
c392540b FC |
74 | public static final int DEFAULT_NUMBER_OF_BUCKETS = 16 * 1000; |
75 | ||
b544077e | 76 | /** |
f8177ba2 | 77 | * Number of events after which listeners will be notified. |
b544077e | 78 | */ |
fbd124dd | 79 | public static final int REFRESH_FREQUENCY = DEFAULT_NUMBER_OF_BUCKETS; |
bfe038ff | 80 | |
c392540b FC |
81 | // ------------------------------------------------------------------------ |
82 | // Attributes | |
83 | // ------------------------------------------------------------------------ | |
84 | ||
85 | // Bucket management | |
86 | private final int fNbBuckets; | |
87 | private final long[] fBuckets; | |
88 | private long fBucketDuration; | |
89 | private long fNbEvents; | |
90 | private int fLastBucket; | |
91 | ||
92 | // Timestamps | |
fbd124dd | 93 | private long fFirstBucketTime; // could be negative when analyzing events with descending order!!! |
c392540b FC |
94 | private long fFirstEventTime; |
95 | private long fLastEventTime; | |
96 | private long fCurrentEventTime; | |
97 | private long fTimeLimit; | |
bfe038ff | 98 | |
e0752744 | 99 | // Private listener lists |
fbd124dd | 100 | private final ListenerList fModelListeners; |
bfe038ff | 101 | |
e0752744 FC |
102 | // ------------------------------------------------------------------------ |
103 | // Constructors | |
104 | // ------------------------------------------------------------------------ | |
105 | ||
b544077e BH |
106 | /** |
107 | * Default constructor with default number of buckets. | |
108 | */ | |
c392540b | 109 | public HistogramDataModel() { |
00419b1f FC |
110 | this(0, DEFAULT_NUMBER_OF_BUCKETS); |
111 | } | |
112 | ||
113 | /** | |
114 | * Default constructor with default number of buckets. | |
115 | * @param startTime The histogram start time | |
116 | * @since 2.0 | |
117 | */ | |
118 | public HistogramDataModel(long startTime) { | |
119 | this(startTime, DEFAULT_NUMBER_OF_BUCKETS); | |
c392540b FC |
120 | } |
121 | ||
b544077e BH |
122 | /** |
123 | * Constructor with non-default number of buckets. | |
124 | * @param nbBuckets A number of buckets. | |
125 | */ | |
c392540b | 126 | public HistogramDataModel(int nbBuckets) { |
00419b1f FC |
127 | this(0, nbBuckets); |
128 | } | |
129 | ||
130 | /** | |
131 | * Constructor with non-default number of buckets. | |
132 | * @param startTime the histogram start time | |
133 | * @param nbBuckets A number of buckets. | |
134 | * @since 2.0 | |
135 | */ | |
136 | public HistogramDataModel(long startTime, int nbBuckets) { | |
137 | fFirstBucketTime = fFirstEventTime = fLastEventTime = startTime; | |
c392540b FC |
138 | fNbBuckets = nbBuckets; |
139 | fBuckets = new long[nbBuckets]; | |
fbd124dd | 140 | fModelListeners = new ListenerList(); |
c392540b FC |
141 | clear(); |
142 | } | |
143 | ||
b544077e BH |
144 | /** |
145 | * Copy constructor. | |
146 | * @param other A model to copy. | |
147 | */ | |
c392540b FC |
148 | public HistogramDataModel(HistogramDataModel other) { |
149 | fNbBuckets = other.fNbBuckets; | |
150 | fBuckets = Arrays.copyOf(other.fBuckets, fNbBuckets); | |
00419b1f | 151 | fBucketDuration = Math.max(other.fBucketDuration, 1); |
c392540b FC |
152 | fNbEvents = other.fNbEvents; |
153 | fLastBucket = other.fLastBucket; | |
fbd124dd | 154 | fFirstBucketTime = other.fFirstBucketTime; |
c392540b FC |
155 | fFirstEventTime = other.fFirstEventTime; |
156 | fLastEventTime = other.fLastEventTime; | |
157 | fCurrentEventTime = other.fCurrentEventTime; | |
158 | fTimeLimit = other.fTimeLimit; | |
fbd124dd BH |
159 | fModelListeners = new ListenerList(); |
160 | Object[] listeners = other.fModelListeners.getListeners(); | |
161 | for (Object listener : listeners) { | |
162 | fModelListeners.add(listener); | |
163 | } | |
c392540b FC |
164 | } |
165 | ||
166 | // ------------------------------------------------------------------------ | |
167 | // Accessors | |
168 | // ------------------------------------------------------------------------ | |
169 | ||
b544077e BH |
170 | /** |
171 | * Returns the number of events in the data model. | |
172 | * @return number of events. | |
173 | */ | |
c392540b FC |
174 | public long getNbEvents() { |
175 | return fNbEvents; | |
176 | } | |
177 | ||
b544077e BH |
178 | /** |
179 | * Returns the number of buckets in the model. | |
180 | * @return number of buckets. | |
181 | */ | |
c392540b FC |
182 | public int getNbBuckets() { |
183 | return fNbBuckets; | |
184 | } | |
185 | ||
b544077e BH |
186 | /** |
187 | * Returns the current bucket duration. | |
188 | * @return bucket duration | |
189 | */ | |
c392540b FC |
190 | public long getBucketDuration() { |
191 | return fBucketDuration; | |
192 | } | |
bfe038ff | 193 | |
b544077e BH |
194 | /** |
195 | * Returns the time value of the first bucket in the model. | |
196 | * @return time of first bucket. | |
197 | */ | |
fbd124dd BH |
198 | public long getFirstBucketTime() { |
199 | return fFirstBucketTime; | |
200 | } | |
c392540b | 201 | |
b544077e BH |
202 | /** |
203 | * Returns the time of the first event in the model. | |
204 | * @return time of first event. | |
205 | */ | |
c392540b FC |
206 | public long getStartTime() { |
207 | return fFirstEventTime; | |
208 | } | |
bfe038ff | 209 | |
00419b1f FC |
210 | /** |
211 | * Sets the model start time | |
212 | * @param startTime the histogram range start time | |
213 | * @param endTime the histogram range end time | |
214 | * @since 2.0 | |
215 | */ | |
216 | public void setTimeRange(long startTime, long endTime) { | |
217 | fFirstBucketTime = fFirstEventTime = fLastEventTime = startTime; | |
218 | fBucketDuration = 1; | |
219 | updateEndTime(); | |
220 | while (endTime >= fTimeLimit) { | |
221 | mergeBuckets(); | |
222 | } | |
223 | } | |
224 | ||
b544077e BH |
225 | /** |
226 | * Returns the time of the last event in the model. | |
227 | * @return the time of last event. | |
228 | */ | |
c392540b FC |
229 | public long getEndTime() { |
230 | return fLastEventTime; | |
231 | } | |
232 | ||
b544077e | 233 | /** |
f8177ba2 | 234 | * Returns the time of the current event in the model. |
b544077e BH |
235 | * @return the time of the current event. |
236 | */ | |
c392540b FC |
237 | public long getCurrentEventTime() { |
238 | return fCurrentEventTime; | |
239 | } | |
240 | ||
b544077e BH |
241 | /** |
242 | * Returns the time limit with is: start time + nbBuckets * bucketDuration | |
243 | * @return the time limit. | |
244 | */ | |
c392540b FC |
245 | public long getTimeLimit() { |
246 | return fTimeLimit; | |
247 | } | |
bfe038ff | 248 | |
fbd124dd BH |
249 | // ------------------------------------------------------------------------ |
250 | // Listener handling | |
251 | // ------------------------------------------------------------------------ | |
bfe038ff | 252 | |
b544077e BH |
253 | /** |
254 | * Add a listener to the model to be informed about model changes. | |
255 | * @param listener A listener to add. | |
256 | */ | |
fbd124dd | 257 | public void addHistogramListener(IHistogramModelListener listener) { |
bfe038ff | 258 | fModelListeners.add(listener); |
fbd124dd | 259 | } |
bfe038ff | 260 | |
b544077e BH |
261 | /** |
262 | * Remove a given model listener. | |
263 | * @param listener A listener to remove. | |
264 | */ | |
fbd124dd BH |
265 | public void removeHistogramListener(IHistogramModelListener listener) { |
266 | fModelListeners.remove(listener); | |
267 | } | |
c392540b | 268 | |
f8177ba2 | 269 | // Notify listeners (always) |
fbd124dd BH |
270 | private void fireModelUpdateNotification() { |
271 | fireModelUpdateNotification(0); | |
272 | } | |
bfe038ff | 273 | |
b544077e | 274 | // Notify listener on boundary |
fbd124dd | 275 | private void fireModelUpdateNotification(long count) { |
bfe038ff | 276 | if ((count % REFRESH_FREQUENCY) == 0) { |
fbd124dd | 277 | Object[] listeners = fModelListeners.getListeners(); |
bfe038ff MK |
278 | for (Object listener2 : listeners) { |
279 | IHistogramModelListener listener = (IHistogramModelListener) listener2; | |
fbd124dd BH |
280 | listener.modelUpdated(); |
281 | } | |
282 | } | |
283 | } | |
bfe038ff | 284 | |
c392540b FC |
285 | // ------------------------------------------------------------------------ |
286 | // Operations | |
287 | // ------------------------------------------------------------------------ | |
e0752744 | 288 | |
fbd124dd BH |
289 | @Override |
290 | public void complete() { | |
291 | fireModelUpdateNotification(); | |
292 | } | |
c392540b FC |
293 | |
294 | /** | |
295 | * Clear the histogram model. | |
b544077e | 296 | * @see org.eclipse.linuxtools.tmf.ui.views.distribution.model.IBaseDistributionModel#clear() |
c392540b | 297 | */ |
fbd124dd | 298 | @Override |
c392540b FC |
299 | public void clear() { |
300 | Arrays.fill(fBuckets, 0); | |
301 | fNbEvents = 0; | |
fbd124dd | 302 | fFirstBucketTime = 0; |
c392540b FC |
303 | fLastEventTime = 0; |
304 | fCurrentEventTime = 0; | |
305 | fLastBucket = 0; | |
f8177ba2 | 306 | fBucketDuration = 1; |
c392540b | 307 | updateEndTime(); |
fbd124dd | 308 | fireModelUpdateNotification(); |
c392540b FC |
309 | } |
310 | ||
311 | /** | |
f8177ba2 | 312 | * Sets the current event time (no notification of listeners) |
bfe038ff | 313 | * |
b544077e | 314 | * @param timestamp A time stamp to set. |
c392540b FC |
315 | */ |
316 | public void setCurrentEvent(long timestamp) { | |
317 | fCurrentEventTime = timestamp; | |
318 | } | |
319 | ||
fbd124dd | 320 | /** |
f8177ba2 | 321 | * Sets the current event time with notification of listeners |
bfe038ff | 322 | * |
b544077e | 323 | * @param timestamp A time stamp to set. |
fbd124dd BH |
324 | */ |
325 | public void setCurrentEventNotifyListeners(long timestamp) { | |
326 | fCurrentEventTime = timestamp; | |
327 | fireModelUpdateNotification(); | |
328 | } | |
bfe038ff | 329 | |
c392540b FC |
330 | /** |
331 | * Add event to the correct bucket, compacting the if needed. | |
bfe038ff | 332 | * |
b544077e BH |
333 | * @param eventCount The current event Count (for notification purposes) |
334 | * @param timestamp The timestamp of the event to count | |
f8177ba2 | 335 | * |
c392540b | 336 | */ |
fbd124dd BH |
337 | @Override |
338 | public void countEvent(long eventCount, long timestamp) { | |
bfe038ff | 339 | |
fbd124dd BH |
340 | // Validate |
341 | if (timestamp < 0) { | |
fbd124dd BH |
342 | return; |
343 | } | |
bfe038ff | 344 | |
c392540b | 345 | // Set the start/end time if not already done |
00419b1f | 346 | if ((fFirstBucketTime == 0) && (fLastBucket == 0) && (fBuckets[0] == 0) && (timestamp > 0)) { |
fbd124dd | 347 | fFirstBucketTime = timestamp; |
c392540b FC |
348 | fFirstEventTime = timestamp; |
349 | updateEndTime(); | |
350 | } | |
bfe038ff | 351 | |
fbd124dd BH |
352 | if (timestamp < fFirstEventTime) { |
353 | fFirstEventTime = timestamp; | |
354 | } | |
bfe038ff | 355 | |
c392540b FC |
356 | if (fLastEventTime < timestamp) { |
357 | fLastEventTime = timestamp; | |
358 | } | |
bfe038ff | 359 | |
fbd124dd | 360 | if (timestamp >= fFirstBucketTime) { |
c392540b | 361 | |
fbd124dd BH |
362 | // Compact as needed |
363 | while (timestamp >= fTimeLimit) { | |
364 | mergeBuckets(); | |
365 | } | |
c392540b | 366 | |
fbd124dd | 367 | } else { |
bfe038ff | 368 | |
fbd124dd BH |
369 | // get offset for adjustment |
370 | int offset = getOffset(timestamp); | |
371 | ||
372 | // Compact as needed | |
bfe038ff | 373 | while((fLastBucket + offset) >= fNbBuckets) { |
fbd124dd BH |
374 | mergeBuckets(); |
375 | offset = getOffset(timestamp); | |
376 | } | |
bfe038ff | 377 | |
fbd124dd BH |
378 | moveBuckets(offset); |
379 | ||
380 | fLastBucket = fLastBucket + offset; | |
c392540b | 381 | |
bfe038ff | 382 | fFirstBucketTime = fFirstBucketTime - (offset*fBucketDuration); |
fbd124dd BH |
383 | updateEndTime(); |
384 | } | |
bfe038ff | 385 | |
c392540b | 386 | // Increment the right bucket |
fbd124dd | 387 | int index = (int) ((timestamp - fFirstBucketTime) / fBucketDuration); |
c392540b FC |
388 | fBuckets[index]++; |
389 | fNbEvents++; | |
bfe038ff | 390 | if (fLastBucket < index) { |
c392540b | 391 | fLastBucket = index; |
bfe038ff MK |
392 | } |
393 | ||
fbd124dd | 394 | fireModelUpdateNotification(eventCount); |
c392540b FC |
395 | } |
396 | ||
397 | /** | |
fbd124dd | 398 | * Scale the model data to the width, height and bar width requested. |
bfe038ff | 399 | * |
b544077e BH |
400 | * @param width A width of the histogram canvas |
401 | * @param height A height of the histogram canvas | |
402 | * @param barWidth A width (in pixel) of a histogram bar | |
403 | * @return the result array of size [width] and where the highest value doesn't exceed [height] | |
f8177ba2 | 404 | * |
b544077e | 405 | * @see org.eclipse.linuxtools.tmf.ui.views.histogram.IHistogramDataModel#scaleTo(int, int, int) |
c392540b | 406 | */ |
fbd124dd BH |
407 | @Override |
408 | public HistogramScaledData scaleTo(int width, int height, int barWidth) { | |
c392540b | 409 | // Basic validation |
bfe038ff MK |
410 | if ((width <= 0) || (height <= 0) || (barWidth <= 0)) |
411 | { | |
fbd124dd | 412 | throw new AssertionError("Invalid histogram dimensions (" + width + "x" + height + ", barWidth=" + barWidth + ")"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ |
bfe038ff | 413 | } |
c392540b FC |
414 | |
415 | // The result structure | |
fbd124dd | 416 | HistogramScaledData result = new HistogramScaledData(width, height, barWidth); |
c392540b FC |
417 | |
418 | // Scale horizontally | |
74237cc3 | 419 | result.fMaxValue = 0; |
bfe038ff | 420 | |
fbd124dd | 421 | int nbBars = width / barWidth; |
bfe038ff MK |
422 | int bucketsPerBar = (fLastBucket / nbBars) + 1; |
423 | result.fBucketDuration = Math.max(bucketsPerBar * fBucketDuration,1); | |
fbd124dd | 424 | for (int i = 0; i < nbBars; i++) { |
c392540b | 425 | int count = 0; |
bfe038ff MK |
426 | for (int j = i * bucketsPerBar; j < ((i + 1) * bucketsPerBar); j++) { |
427 | if (fNbBuckets <= j) { | |
c392540b | 428 | break; |
bfe038ff | 429 | } |
c392540b FC |
430 | count += fBuckets[j]; |
431 | } | |
432 | result.fData[i] = count; | |
433 | result.fLastBucket = i; | |
bfe038ff | 434 | if (result.fMaxValue < count) { |
c392540b | 435 | result.fMaxValue = count; |
bfe038ff | 436 | } |
c392540b FC |
437 | } |
438 | ||
439 | // Scale vertically | |
440 | if (result.fMaxValue > 0) { | |
441 | result.fScalingFactor = (double) height / result.fMaxValue; | |
442 | } | |
443 | ||
bfe038ff | 444 | fBucketDuration = Math.max(fBucketDuration, 1); |
c392540b | 445 | // Set the current event index in the scaled histogram |
bfe038ff | 446 | if ((fCurrentEventTime >= fFirstBucketTime) && (fCurrentEventTime <= fLastEventTime)) { |
fbd124dd | 447 | result.fCurrentBucket = (int) ((fCurrentEventTime - fFirstBucketTime) / fBucketDuration) / bucketsPerBar; |
bfe038ff | 448 | } else { |
c392540b | 449 | result.fCurrentBucket = HistogramScaledData.OUT_OF_RANGE_BUCKET; |
bfe038ff | 450 | } |
c392540b | 451 | |
fbd124dd BH |
452 | result.fFirstBucketTime = fFirstBucketTime; |
453 | result.fFirstEventTime = fFirstEventTime; | |
c392540b FC |
454 | return result; |
455 | } | |
456 | ||
457 | // ------------------------------------------------------------------------ | |
458 | // Helper functions | |
459 | // ------------------------------------------------------------------------ | |
460 | ||
461 | private void updateEndTime() { | |
bfe038ff | 462 | fTimeLimit = fFirstBucketTime + (fNbBuckets * fBucketDuration); |
c392540b FC |
463 | } |
464 | ||
465 | private void mergeBuckets() { | |
bfe038ff MK |
466 | for (int i = 0; i < (fNbBuckets / 2); i++) { |
467 | fBuckets[i] = fBuckets[2 * i] + fBuckets[(2 * i) + 1]; | |
c392540b FC |
468 | } |
469 | Arrays.fill(fBuckets, fNbBuckets / 2, fNbBuckets, 0); | |
470 | fBucketDuration *= 2; | |
471 | updateEndTime(); | |
bfe038ff | 472 | fLastBucket = (fNbBuckets / 2) - 1; |
c392540b | 473 | } |
bfe038ff | 474 | |
fbd124dd BH |
475 | private void moveBuckets(int offset) { |
476 | for(int i = fNbBuckets - 1; i >= offset; i--) { | |
bfe038ff | 477 | fBuckets[i] = fBuckets[i-offset]; |
fbd124dd BH |
478 | } |
479 | ||
480 | for (int i = 0; i < offset; i++) { | |
481 | fBuckets[i] = 0; | |
482 | } | |
483 | } | |
484 | ||
485 | private int getOffset(long timestamp) { | |
486 | int offset = (int) ((fFirstBucketTime - timestamp) / fBucketDuration); | |
bfe038ff | 487 | if (((fFirstBucketTime - timestamp) % fBucketDuration) != 0) { |
fbd124dd BH |
488 | offset++; |
489 | } | |
490 | return offset; | |
491 | } | |
c392540b FC |
492 | |
493 | } |