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8c8bf09f | 1 | /******************************************************************************* |
8636b448 | 2 | * Copyright (c) 2009, 2011, 2012 Ericsson |
8c8bf09f ASL |
3 | * |
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 | |
8 | * | |
9 | * Contributors: | |
10 | * Francois Chouinard - Initial API and implementation | |
8636b448 | 11 | * Francois Chouinard - Updated as per TMF Trace Model 1.0 |
8c8bf09f ASL |
12 | *******************************************************************************/ |
13 | ||
6c13869b | 14 | package org.eclipse.linuxtools.tmf.core.trace; |
8c8bf09f | 15 | |
12c155f5 FC |
16 | import java.io.FileNotFoundException; |
17 | ||
18 | import org.eclipse.core.resources.IProject; | |
a1091415 | 19 | import org.eclipse.core.resources.IResource; |
f17b2f70 | 20 | import org.eclipse.linuxtools.tmf.core.component.ITmfDataProvider; |
72f1e62a | 21 | import org.eclipse.linuxtools.tmf.core.event.ITmfEvent; |
4df4581d | 22 | import org.eclipse.linuxtools.tmf.core.event.ITmfTimestamp; |
6c13869b | 23 | import org.eclipse.linuxtools.tmf.core.event.TmfTimeRange; |
7e6347b0 | 24 | import org.eclipse.linuxtools.tmf.core.request.ITmfEventRequest; |
8c8bf09f ASL |
25 | |
26 | /** | |
146a887c | 27 | * <b><u>ITmfTrace</u></b> |
8c8bf09f | 28 | * <p> |
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29 | * The event stream structure in TMF. In its basic form, a trace has: |
30 | * <ul> | |
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31 | * <li> an associated Eclipse resource |
32 | * <li> a path to its location on the file system | |
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33 | * <li> the type of the events it contains |
34 | * <li> the number of events it contains | |
35 | * <li> the time range (span) of the events it contains | |
36 | * </ul> | |
37 | * Concrete ITmfTrace classes have to provide a parameter-less constructor and | |
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38 | * an initialization method (<i>initTrace</i>) if they are to be opened from |
39 | * the Project View. Also, a validation method (<i>validate</i>) has to be | |
40 | * provided to ensure that the trace is of the correct type. | |
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41 | * <p> |
42 | * A trace can be accessed simultaneously from multiple threads by various | |
43 | * application components. To avoid obvious multi-threading issues, the trace | |
44 | * uses an ITmfContext as a synchronization aid for its read operations. | |
45 | * <p> | |
46 | * A proper ITmfContext can be obtained by performing a seek operation on the | |
47 | * trace. Seek operations can be performed for a particular event (by rank or | |
48 | * timestamp) or for a plain trace location. | |
49 | * <p> | |
d337369a | 50 | * <b>Example 1</b>: Process a whole trace |
f17b2f70 | 51 | * <pre> |
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52 | * ITmfContext context = trace.seekEvent(0); |
53 | * ITmfEvent event = trace.getEvent(context); | |
f17b2f70 | 54 | * while (event != null) { |
d337369a | 55 | * processEvent(event); |
7e6347b0 | 56 | * event = trace.getEvent(context); |
f17b2f70 FC |
57 | * } |
58 | * </pre> | |
59 | * <b>Example 2</b>: Process 50 events starting from the 1000th event | |
60 | * <pre> | |
61 | * int nbEventsRead = 0; | |
62 | * ITmfContext context = trace.seekEvent(1000); | |
7e6347b0 | 63 | * ITmfEvent event = trace.getEvent(context); |
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64 | * while (event != null && nbEventsRead < 50) { |
65 | * nbEventsRead++; | |
d337369a | 66 | * processEvent(event); |
7e6347b0 | 67 | * event = trace.getEvent(context); |
f17b2f70 FC |
68 | * } |
69 | * </pre> | |
70 | * <b>Example 3</b>: Process the events between 2 timestamps (inclusive) | |
71 | * <pre> | |
72 | * ITmfTimestamp startTime = ...; | |
73 | * ITmfTimestamp endTime = ...; | |
74 | * ITmfContext context = trace.seekEvent(startTime); | |
7e6347b0 | 75 | * ITmfEvent event = trace.getEvent(context); |
f17b2f70 | 76 | * while (event != null && event.getTimestamp().compareTo(endTime) <= 0) { |
d337369a | 77 | * processEvent(event); |
7e6347b0 | 78 | * event = trace.getEvent(context); |
f17b2f70 FC |
79 | * } |
80 | * </pre> | |
d337369a | 81 | * A trace is also an event provider so it can process event requests |
7e6347b0 | 82 | * asynchronously (and coalesce compatible, concurrent requests). |
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83 | * <p> |
84 | * </pre> | |
7e6347b0 | 85 | * <b>Example 4</b>: Process a whole trace (see ITmfEventRequest for variants) |
d337369a FC |
86 | * <pre> |
87 | * ITmfRequest request = new TmfEventRequest<MyEventType>(MyEventType.class) { | |
88 | * @Override | |
89 | * public void handleData(MyEventType event) { | |
90 | * super.handleData(event); | |
91 | * processEvent(event); | |
92 | * } | |
93 | * @Override | |
94 | * public void handleCompleted() { | |
95 | * finish(); | |
96 | * super.handleCompleted(); | |
97 | * } | |
98 | * }; | |
7e6347b0 | 99 | * |
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100 | * fTrace.handleRequest(request); |
101 | * if (youWant) { | |
102 | * request.waitForCompletion(); | |
103 | * } | |
104 | * </pre> | |
105 | * @see ITmfEvent | |
106 | * @see ITmfEventProvider | |
7e6347b0 | 107 | * @see ITmfEventRequest |
8c8bf09f | 108 | */ |
f17b2f70 | 109 | public interface ITmfTrace<T extends ITmfEvent> extends ITmfDataProvider<T> { |
12c155f5 | 110 | |
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111 | // ------------------------------------------------------------------------ |
112 | // Initializers | |
113 | // ------------------------------------------------------------------------ | |
085d898f | 114 | |
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115 | /** |
116 | * Initialize a newly instantiated "empty" trace object. This is used to | |
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117 | * properly parameterize an ITmfTrace instantiated with its parameterless |
118 | * constructor. | |
d337369a | 119 | * <p> |
25e48683 FC |
120 | * Typically, the parameterless constructor will provide the block size |
121 | * and its associated parser and indexer. | |
122 | * | |
123 | * @param resource the trace resource | |
3118edf1 | 124 | * @param path the trace path |
3791b5df | 125 | * @param type the trace event type |
3118edf1 FC |
126 | * @throws FileNotFoundException |
127 | */ | |
25e48683 | 128 | public void initTrace(IResource resource, String path, Class<T> type) throws FileNotFoundException; |
12c155f5 | 129 | |
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130 | /** |
131 | * Validate that the trace is of the correct type. | |
132 | * | |
133 | * @param project the eclipse project | |
134 | * @param path the trace path | |
135 | * | |
136 | * @return true if trace is valid | |
137 | */ | |
138 | public boolean validate(IProject project, String path); | |
12c155f5 | 139 | |
8636b448 | 140 | // ------------------------------------------------------------------------ |
3118edf1 | 141 | // Basic getters |
8636b448 | 142 | // ------------------------------------------------------------------------ |
b0a282fb | 143 | |
abfad0aa | 144 | /** |
25e48683 | 145 | * @return the trace event type |
12c155f5 | 146 | */ |
25e48683 | 147 | public Class<T> getType(); |
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148 | |
149 | /** | |
25e48683 | 150 | * @return the associated trace resource |
12c155f5 | 151 | */ |
3791b5df | 152 | public IResource getResource(); |
12c155f5 | 153 | |
25e48683 FC |
154 | /** |
155 | * @return the trace path | |
156 | */ | |
157 | public String getPath(); | |
158 | ||
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159 | /** |
160 | * @return the trace cache size | |
161 | */ | |
162 | public int getCacheSize(); | |
163 | ||
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164 | // ------------------------------------------------------------------------ |
165 | // Trace characteristics getters | |
166 | // ------------------------------------------------------------------------ | |
167 | ||
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168 | /** |
169 | * @return the number of events in the trace | |
170 | */ | |
171 | public long getNbEvents(); | |
172 | ||
173 | /** | |
3118edf1 | 174 | * @return the trace time range |
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175 | */ |
176 | public TmfTimeRange getTimeRange(); | |
177 | ||
3118edf1 FC |
178 | /** |
179 | * @return the timestamp of the first trace event | |
180 | */ | |
4df4581d | 181 | public ITmfTimestamp getStartTime(); |
12c155f5 | 182 | |
3118edf1 FC |
183 | /** |
184 | * @return the timestamp of the last trace event | |
185 | */ | |
4df4581d | 186 | public ITmfTimestamp getEndTime(); |
62d1696a | 187 | |
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188 | // ------------------------------------------------------------------------ |
189 | // Trace positioning getters | |
190 | // ------------------------------------------------------------------------ | |
1b70b6dc | 191 | |
3118edf1 | 192 | /** |
25e48683 | 193 | * @return the current trace location |
3118edf1 | 194 | */ |
25e48683 | 195 | public ITmfLocation<?> getCurrentLocation(); |
3791b5df FC |
196 | |
197 | /** | |
25e48683 | 198 | * Returns the ratio (proportion) corresponding to the specified location. |
3791b5df | 199 | * |
25e48683 FC |
200 | * @param location a trace specific location |
201 | * @return a floating-point number between 0.0 (beginning) and 1.0 (end) | |
3791b5df | 202 | */ |
25e48683 | 203 | public double getLocationRatio(ITmfLocation<?> location); |
3791b5df | 204 | |
8636b448 | 205 | // ------------------------------------------------------------------------ |
7e6347b0 | 206 | // SeekEvent operations (returning a trace context) |
8636b448 FC |
207 | // ------------------------------------------------------------------------ |
208 | ||
12c155f5 | 209 | /** |
7e6347b0 FC |
210 | * Position the trace at the specified (trace specific) location. |
211 | * <p> | |
212 | * A null location is interpreted as seeking for the first event of the | |
213 | * trace. | |
25e48683 | 214 | * <p> |
7e6347b0 FC |
215 | * If not null, the location requested must be valid otherwise the returned |
216 | * context is undefined (up to the implementation to recover if possible). | |
25e48683 | 217 | * <p> |
7e6347b0 | 218 | * @param location the trace specific location |
3118edf1 | 219 | * @return a context which can later be used to read the corresponding event |
8c8bf09f | 220 | */ |
7e6347b0 | 221 | public ITmfContext seekEvent(ITmfLocation<?> location); |
12c155f5 | 222 | |
c76c54bb | 223 | /** |
7e6347b0 | 224 | * Position the trace at the 'rank'th event in the trace. |
09e86496 | 225 | * <p> |
7e6347b0 FC |
226 | * A rank <= 0 is interpreted as seeking for the first event of the |
227 | * trace. | |
228 | * <p> | |
229 | * If the requested rank is beyond the last trace event, the context | |
230 | * returned will yield a null event if used in a subsequent read. | |
c76c54bb | 231 | * |
7e6347b0 | 232 | * @param rank the event rank |
3118edf1 | 233 | * @return a context which can later be used to read the corresponding event |
c76c54bb | 234 | */ |
7e6347b0 | 235 | public ITmfContext seekEvent(long rank); |
12c155f5 | 236 | |
3118edf1 FC |
237 | /** |
238 | * Position the trace at the first event with the specified timestamp. If | |
239 | * there is no event with the requested timestamp, a context pointing to | |
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240 | * the next chronological event is returned. |
241 | * <p> | |
242 | * A null timestamp is interpreted as seeking for the first event of the | |
243 | * trace. | |
244 | * <p> | |
245 | * If the requested timestamp is beyond the last trace event, the context | |
246 | * returned will yield a null event if used in a subsequent read. | |
3118edf1 FC |
247 | * |
248 | * @param timestamp the timestamp of desired event | |
249 | * @return a context which can later be used to read the corresponding event | |
250 | */ | |
251 | public ITmfContext seekEvent(ITmfTimestamp timestamp); | |
252 | ||
253 | /** | |
7e6347b0 FC |
254 | * Position the trace at the event located at the specified ratio in the |
255 | * trace file. | |
09e86496 | 256 | * <p> |
7e6347b0 FC |
257 | * The notion of ratio (0.0 <= r <= 1.0) is trace specific and left |
258 | * voluntarily vague. Typically, it would refer to the event proportional | |
259 | * rank (arguably more intuitive) or timestamp in the trace file. | |
3118edf1 | 260 | * |
7e6347b0 | 261 | * @param ratio the proportional 'rank' in the trace |
3118edf1 FC |
262 | * @return a context which can later be used to read the corresponding event |
263 | */ | |
7e6347b0 | 264 | public ITmfContext seekEvent(double ratio); |
3118edf1 | 265 | |
8636b448 | 266 | // ------------------------------------------------------------------------ |
25e48683 | 267 | // Read operations (returning an actual event) |
8636b448 FC |
268 | // ------------------------------------------------------------------------ |
269 | ||
270 | /** | |
3118edf1 FC |
271 | * Return the event pointed by the supplied context (or null if no event |
272 | * left) and updates the context to point the next event. | |
8636b448 | 273 | * |
25e48683 FC |
274 | * @param context the read context (will be updated) |
275 | * @return the event pointed to by the context | |
8636b448 | 276 | */ |
7e6347b0 | 277 | public ITmfEvent readEvent(ITmfContext context); |
8636b448 | 278 | |
25e48683 | 279 | // ------------------------------------------------------------------------ |
7e6347b0 | 280 | // |
25e48683 | 281 | // ------------------------------------------------------------------------ |
3791b5df | 282 | |
abfad0aa | 283 | /** |
25e48683 | 284 | * @return the streaming interval in ms (0 if not a streaming trace) |
abfad0aa | 285 | */ |
25e48683 | 286 | public long getStreamingInterval(); |
085d898f | 287 | |
8c8bf09f | 288 | } |