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1b9d3765 | 1 | /******************************************************************************* |
e13bd4cd | 2 | * Copyright (c) 2013, 2015 Ericsson |
1b9d3765 AM |
3 | * All rights reserved. This program and the accompanying materials are |
4 | * made available under the terms of the Eclipse Public License v1.0 which | |
5 | * accompanies this distribution, and is available at | |
6 | * http://www.eclipse.org/legal/epl-v10.html | |
7 | * | |
8 | * Contributors: | |
9 | * Alexandre Montplaisir - Initial API and implementation | |
e13bd4cd | 10 | * Patrick Tasse - Add message to exceptions |
1b9d3765 AM |
11 | *******************************************************************************/ |
12 | ||
2bdf0193 | 13 | package org.eclipse.tracecompass.internal.tmf.core.statesystem.backends.partial; |
1b9d3765 AM |
14 | |
15 | import java.io.File; | |
16 | import java.io.FileInputStream; | |
17 | import java.io.PrintWriter; | |
18 | import java.util.List; | |
19 | import java.util.Map; | |
20 | import java.util.TreeMap; | |
21 | import java.util.concurrent.CountDownLatch; | |
22 | ||
3a755f44 | 23 | import org.eclipse.jdt.annotation.NonNull; |
e894a508 AM |
24 | import org.eclipse.tracecompass.statesystem.core.ITmfStateSystem; |
25 | import org.eclipse.tracecompass.statesystem.core.backend.IStateHistoryBackend; | |
26 | import org.eclipse.tracecompass.statesystem.core.exceptions.AttributeNotFoundException; | |
27 | import org.eclipse.tracecompass.statesystem.core.exceptions.StateSystemDisposedException; | |
28 | import org.eclipse.tracecompass.statesystem.core.exceptions.TimeRangeException; | |
29 | import org.eclipse.tracecompass.statesystem.core.interval.ITmfStateInterval; | |
30 | import org.eclipse.tracecompass.statesystem.core.interval.TmfStateInterval; | |
31 | import org.eclipse.tracecompass.statesystem.core.statevalue.ITmfStateValue; | |
2bdf0193 AM |
32 | import org.eclipse.tracecompass.tmf.core.event.ITmfEvent; |
33 | import org.eclipse.tracecompass.tmf.core.request.ITmfEventRequest; | |
34 | import org.eclipse.tracecompass.tmf.core.request.TmfEventRequest; | |
35 | import org.eclipse.tracecompass.tmf.core.statesystem.AbstractTmfStateProvider; | |
36 | import org.eclipse.tracecompass.tmf.core.statesystem.ITmfStateProvider; | |
37 | import org.eclipse.tracecompass.tmf.core.timestamp.ITmfTimestamp; | |
38 | import org.eclipse.tracecompass.tmf.core.timestamp.TmfTimeRange; | |
39 | import org.eclipse.tracecompass.tmf.core.timestamp.TmfTimestamp; | |
40 | import org.eclipse.tracecompass.tmf.core.trace.ITmfTrace; | |
1b9d3765 AM |
41 | |
42 | /** | |
43 | * Partial state history back-end. | |
44 | * | |
45 | * This is a shim inserted between the real state system and a "real" history | |
46 | * back-end. It will keep checkpoints, every n trace events (where n is called | |
47 | * the granularity) and will only forward to the real state history the state | |
48 | * intervals that crosses at least one checkpoint. Every other interval will | |
49 | * be discarded. | |
50 | * | |
51 | * This would mean that it can only answer queries exactly at the checkpoints. | |
52 | * For any other timestamps (ie, most of the time), it will load the closest | |
53 | * earlier checkpoint, and will re-feed the state-change-input with events from | |
54 | * the trace, to restore the real state at the time that was requested. | |
55 | * | |
56 | * @author Alexandre Montplaisir | |
57 | */ | |
58 | public class PartialHistoryBackend implements IStateHistoryBackend { | |
59 | ||
b2f62cb5 AM |
60 | private final @NonNull String fSSID; |
61 | ||
1b9d3765 AM |
62 | /** |
63 | * A partial history needs the state input plugin to re-generate state | |
64 | * between checkpoints. | |
65 | */ | |
086cd39c | 66 | private final @NonNull ITmfStateProvider fPartialInput; |
1b9d3765 AM |
67 | |
68 | /** | |
69 | * Fake state system that is used for partially rebuilding the states (when | |
70 | * going from a checkpoint to a target query timestamp). | |
71 | */ | |
086cd39c | 72 | private final @NonNull PartialStateSystem fPartialSS; |
1b9d3765 AM |
73 | |
74 | /** Reference to the "real" state history that is used for storage */ | |
086cd39c | 75 | private final @NonNull IStateHistoryBackend fInnerHistory; |
1b9d3765 AM |
76 | |
77 | /** Checkpoints map, <Timestamp, Rank in the trace> */ | |
086cd39c | 78 | private final @NonNull TreeMap<Long, Long> fCheckpoints = new TreeMap<>(); |
1b9d3765 AM |
79 | |
80 | /** Latch tracking if the initial checkpoint registration is done */ | |
086cd39c | 81 | private final @NonNull CountDownLatch fCheckpointsReady = new CountDownLatch(1); |
1b9d3765 | 82 | |
086cd39c | 83 | private final long fGranularity; |
1b9d3765 | 84 | |
086cd39c | 85 | private long fLatestTime; |
1b9d3765 AM |
86 | |
87 | /** | |
88 | * Constructor | |
89 | * | |
b2f62cb5 AM |
90 | * @param ssid |
91 | * The state system's ID | |
1b9d3765 AM |
92 | * @param partialInput |
93 | * The state change input object that was used to build the | |
94 | * upstream state system. This partial history will make its own | |
95 | * copy (since they have different targets). | |
96 | * @param pss | |
97 | * The partial history's inner state system. It should already be | |
98 | * assigned to partialInput. | |
99 | * @param realBackend | |
100 | * The real state history back-end to use. It's supposed to be | |
101 | * modular, so it should be able to be of any type. | |
102 | * @param granularity | |
103 | * Configuration parameter indicating how many trace events there | |
104 | * should be between each checkpoint | |
105 | */ | |
b2f62cb5 AM |
106 | public PartialHistoryBackend(@NonNull String ssid, |
107 | ITmfStateProvider partialInput, | |
108 | PartialStateSystem pss, | |
109 | IStateHistoryBackend realBackend, | |
110 | long granularity) { | |
cb42195c AM |
111 | if (granularity <= 0 || partialInput == null || pss == null || |
112 | partialInput.getAssignedStateSystem() != pss) { | |
1b9d3765 AM |
113 | throw new IllegalArgumentException(); |
114 | } | |
1b9d3765 AM |
115 | |
116 | final long startTime = realBackend.getStartTime(); | |
117 | ||
b2f62cb5 | 118 | fSSID = ssid; |
086cd39c MK |
119 | fPartialInput = partialInput; |
120 | fPartialSS = pss; | |
1b9d3765 | 121 | |
086cd39c MK |
122 | fInnerHistory = realBackend; |
123 | fGranularity = granularity; | |
1b9d3765 | 124 | |
086cd39c | 125 | fLatestTime = startTime; |
1b9d3765 AM |
126 | |
127 | registerCheckpoints(); | |
128 | } | |
129 | ||
130 | private void registerCheckpoints() { | |
086cd39c MK |
131 | ITmfEventRequest request = new CheckpointsRequest(fPartialInput, fCheckpoints); |
132 | fPartialInput.getTrace().sendRequest(request); | |
1b9d3765 AM |
133 | /* The request will countDown the checkpoints latch once it's finished */ |
134 | } | |
135 | ||
b2f62cb5 AM |
136 | @Override |
137 | public String getSSID() { | |
138 | return fSSID; | |
139 | } | |
140 | ||
1b9d3765 AM |
141 | @Override |
142 | public long getStartTime() { | |
086cd39c | 143 | return fInnerHistory.getStartTime(); |
1b9d3765 AM |
144 | } |
145 | ||
146 | @Override | |
147 | public long getEndTime() { | |
086cd39c | 148 | return fLatestTime; |
1b9d3765 AM |
149 | } |
150 | ||
151 | @Override | |
152 | public void insertPastState(long stateStartTime, long stateEndTime, | |
153 | int quark, ITmfStateValue value) throws TimeRangeException { | |
154 | waitForCheckpoints(); | |
155 | ||
156 | /* Update the latest time */ | |
086cd39c MK |
157 | if (stateEndTime > fLatestTime) { |
158 | fLatestTime = stateEndTime; | |
1b9d3765 AM |
159 | } |
160 | ||
161 | /* | |
162 | * Check if the interval intersects the previous checkpoint. If so, | |
163 | * insert it in the real history back-end. | |
164 | * | |
165 | * FIXME since intervals are inserted in order of rank, we could avoid | |
166 | * doing a map lookup every time here (just compare with the known | |
167 | * previous one). | |
168 | */ | |
086cd39c MK |
169 | if (stateStartTime <= fCheckpoints.floorKey(stateEndTime)) { |
170 | fInnerHistory.insertPastState(stateStartTime, stateEndTime, quark, value); | |
1b9d3765 AM |
171 | } |
172 | } | |
173 | ||
174 | @Override | |
175 | public void finishedBuilding(long endTime) throws TimeRangeException { | |
086cd39c | 176 | fInnerHistory.finishedBuilding(endTime); |
1b9d3765 AM |
177 | } |
178 | ||
179 | @Override | |
180 | public FileInputStream supplyAttributeTreeReader() { | |
086cd39c | 181 | return fInnerHistory.supplyAttributeTreeReader(); |
1b9d3765 AM |
182 | } |
183 | ||
184 | @Override | |
185 | public File supplyAttributeTreeWriterFile() { | |
086cd39c | 186 | return fInnerHistory.supplyAttributeTreeWriterFile(); |
1b9d3765 AM |
187 | } |
188 | ||
189 | @Override | |
190 | public long supplyAttributeTreeWriterFilePosition() { | |
086cd39c | 191 | return fInnerHistory.supplyAttributeTreeWriterFilePosition(); |
1b9d3765 AM |
192 | } |
193 | ||
194 | @Override | |
195 | public void removeFiles() { | |
086cd39c | 196 | fInnerHistory.removeFiles(); |
1b9d3765 AM |
197 | } |
198 | ||
199 | @Override | |
200 | public void dispose() { | |
086cd39c MK |
201 | fPartialInput.dispose(); |
202 | fPartialSS.dispose(); | |
203 | fInnerHistory.dispose(); | |
1b9d3765 AM |
204 | } |
205 | ||
206 | @Override | |
207 | public void doQuery(List<ITmfStateInterval> currentStateInfo, long t) | |
208 | throws TimeRangeException, StateSystemDisposedException { | |
209 | /* Wait for required steps to be done */ | |
210 | waitForCheckpoints(); | |
086cd39c | 211 | fPartialSS.getUpstreamSS().waitUntilBuilt(); |
1b9d3765 AM |
212 | |
213 | if (!checkValidTime(t)) { | |
e13bd4cd | 214 | throw new TimeRangeException(fSSID + " Time:" + t + ", Start:" + getStartTime() + ", End:" + getEndTime()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ |
1b9d3765 AM |
215 | } |
216 | ||
217 | /* Reload the previous checkpoint */ | |
086cd39c MK |
218 | long checkpointTime = fCheckpoints.floorKey(t); |
219 | fInnerHistory.doQuery(currentStateInfo, checkpointTime); | |
1b9d3765 AM |
220 | |
221 | /* | |
222 | * Set the initial contents of the partial state system (which is the | |
223 | * contents of the query at the checkpoint). | |
224 | */ | |
086cd39c MK |
225 | fPartialSS.takeQueryLock(); |
226 | fPartialSS.replaceOngoingState(currentStateInfo); | |
1b9d3765 AM |
227 | |
228 | /* Send an event request to update the state system to the target time. */ | |
229 | TmfTimeRange range = new TmfTimeRange( | |
d5ba77db AM |
230 | /* |
231 | * The state at the checkpoint already includes any state change | |
232 | * caused by the event(s) happening exactly at 'checkpointTime', | |
233 | * if any. We must not include those events in the query. | |
234 | */ | |
cb42195c AM |
235 | new TmfTimestamp(checkpointTime + 1, ITmfTimestamp.NANOSECOND_SCALE), |
236 | new TmfTimestamp(t, ITmfTimestamp.NANOSECOND_SCALE)); | |
086cd39c MK |
237 | ITmfEventRequest request = new PartialStateSystemRequest(fPartialInput, range); |
238 | fPartialInput.getTrace().sendRequest(request); | |
1b9d3765 AM |
239 | |
240 | try { | |
241 | request.waitForCompletion(); | |
242 | } catch (InterruptedException e) { | |
243 | e.printStackTrace(); | |
244 | } | |
245 | ||
246 | /* | |
247 | * Now the partial state system should have the ongoing time we are | |
248 | * looking for. However, the method expects a List of *state intervals*, | |
249 | * not state values, so we'll create intervals with a dummy end time. | |
250 | */ | |
251 | try { | |
252 | for (int i = 0; i < currentStateInfo.size(); i++) { | |
253 | long start = 0; | |
254 | ITmfStateValue val = null; | |
086cd39c MK |
255 | start = ((ITmfStateSystem) fPartialSS).getOngoingStartTime(i); |
256 | val = ((ITmfStateSystem) fPartialSS).queryOngoingState(i); | |
1b9d3765 AM |
257 | |
258 | ITmfStateInterval interval = new TmfStateInterval(start, t, i, val); | |
259 | currentStateInfo.set(i, interval); | |
260 | } | |
261 | } catch (AttributeNotFoundException e) { | |
262 | /* Should not happen, we iterate over existing values. */ | |
263 | e.printStackTrace(); | |
264 | } | |
265 | ||
086cd39c | 266 | fPartialSS.releaseQueryLock(); |
1b9d3765 AM |
267 | } |
268 | ||
269 | /** | |
270 | * Single queries are not supported in partial histories. To get the same | |
271 | * result you can do a full query, then call fullState.get(attribute). | |
272 | */ | |
273 | @Override | |
274 | public ITmfStateInterval doSingularQuery(long t, int attributeQuark) { | |
275 | throw new UnsupportedOperationException(); | |
276 | } | |
277 | ||
0d26a9d0 | 278 | private boolean checkValidTime(long t) { |
1b9d3765 AM |
279 | return (t >= getStartTime() && t <= getEndTime()); |
280 | } | |
281 | ||
282 | @Override | |
283 | public void debugPrint(PrintWriter writer) { | |
284 | // TODO Auto-generated method stub | |
285 | } | |
286 | ||
287 | private void waitForCheckpoints() { | |
288 | try { | |
086cd39c | 289 | fCheckpointsReady.await(); |
1b9d3765 AM |
290 | } catch (InterruptedException e) { |
291 | e.printStackTrace(); | |
292 | } | |
293 | } | |
294 | ||
295 | // ------------------------------------------------------------------------ | |
296 | // Event requests types | |
297 | // ------------------------------------------------------------------------ | |
298 | ||
299 | private class CheckpointsRequest extends TmfEventRequest { | |
1b9d3765 AM |
300 | private final ITmfTrace trace; |
301 | private final Map<Long, Long> checkpts; | |
302 | private long eventCount; | |
303 | private long lastCheckpointAt; | |
304 | ||
0fe46f2a | 305 | public CheckpointsRequest(ITmfStateProvider input, Map<Long, Long> checkpoints) { |
e2bcc8a5 | 306 | super(ITmfEvent.class, |
1b9d3765 | 307 | TmfTimeRange.ETERNITY, |
7184fc40 | 308 | 0, |
2740e05c | 309 | ITmfEventRequest.ALL_DATA, |
851d356b | 310 | ITmfEventRequest.ExecutionType.FOREGROUND); |
1b9d3765 AM |
311 | checkpoints.clear(); |
312 | this.trace = input.getTrace(); | |
313 | this.checkpts = checkpoints; | |
cb42195c AM |
314 | eventCount = 0; |
315 | lastCheckpointAt = 0; | |
1b9d3765 AM |
316 | |
317 | /* Insert a checkpoint at the start of the trace */ | |
318 | checkpoints.put(input.getStartTime(), 0L); | |
319 | } | |
320 | ||
321 | @Override | |
322 | public void handleData(final ITmfEvent event) { | |
323 | super.handleData(event); | |
41f3b36b | 324 | if (event.getTrace() == trace) { |
1b9d3765 AM |
325 | eventCount++; |
326 | ||
327 | /* Check if we need to register a new checkpoint */ | |
086cd39c | 328 | if (eventCount >= lastCheckpointAt + fGranularity) { |
1b9d3765 AM |
329 | checkpts.put(event.getTimestamp().getValue(), eventCount); |
330 | lastCheckpointAt = eventCount; | |
331 | } | |
332 | } | |
333 | } | |
334 | ||
335 | @Override | |
336 | public void handleCompleted() { | |
337 | super.handleCompleted(); | |
086cd39c | 338 | fCheckpointsReady.countDown(); |
1b9d3765 AM |
339 | } |
340 | } | |
341 | ||
342 | private class PartialStateSystemRequest extends TmfEventRequest { | |
0fe46f2a | 343 | private final ITmfStateProvider sci; |
1b9d3765 AM |
344 | private final ITmfTrace trace; |
345 | ||
0fe46f2a | 346 | PartialStateSystemRequest(ITmfStateProvider sci, TmfTimeRange range) { |
e2bcc8a5 | 347 | super(ITmfEvent.class, |
1b9d3765 | 348 | range, |
7184fc40 | 349 | 0, |
2740e05c | 350 | ITmfEventRequest.ALL_DATA, |
fd3f1eff | 351 | ITmfEventRequest.ExecutionType.BACKGROUND); |
1b9d3765 AM |
352 | this.sci = sci; |
353 | this.trace = sci.getTrace(); | |
354 | } | |
355 | ||
356 | @Override | |
357 | public void handleData(final ITmfEvent event) { | |
358 | super.handleData(event); | |
41f3b36b | 359 | if (event.getTrace() == trace) { |
1b9d3765 AM |
360 | sci.processEvent(event); |
361 | } | |
362 | } | |
363 | ||
364 | @Override | |
365 | public void handleCompleted() { | |
366 | /* | |
367 | * If we're using a threaded state provider, we need to make sure | |
368 | * all events have been handled by the state system before doing | |
369 | * queries on it. | |
370 | */ | |
086cd39c MK |
371 | if (fPartialInput instanceof AbstractTmfStateProvider) { |
372 | ((AbstractTmfStateProvider) fPartialInput).waitForEmptyQueue(); | |
1b9d3765 AM |
373 | } |
374 | super.handleCompleted(); | |
375 | } | |
376 | ||
1b9d3765 AM |
377 | } |
378 | } |