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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 | 16 | import org.eclipse.core.resources.IProject; |
a1091415 | 17 | import org.eclipse.core.resources.IResource; |
f17b2f70 | 18 | import org.eclipse.linuxtools.tmf.core.component.ITmfDataProvider; |
72f1e62a | 19 | import org.eclipse.linuxtools.tmf.core.event.ITmfEvent; |
4df4581d | 20 | import org.eclipse.linuxtools.tmf.core.event.ITmfTimestamp; |
6c13869b | 21 | import org.eclipse.linuxtools.tmf.core.event.TmfTimeRange; |
b4f71e4a | 22 | import org.eclipse.linuxtools.tmf.core.exceptions.TmfTraceException; |
7e6347b0 | 23 | import org.eclipse.linuxtools.tmf.core.request.ITmfEventRequest; |
8c8bf09f ASL |
24 | |
25 | /** | |
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26 | * The event stream structure in TMF. In its basic form, a trace has: |
27 | * <ul> | |
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28 | * <li> an associated Eclipse resource |
29 | * <li> a path to its location on the file system | |
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30 | * <li> the type of the events it contains |
31 | * <li> the number of events it contains | |
32 | * <li> the time range (span) of the events it contains | |
33 | * </ul> | |
34 | * Concrete ITmfTrace classes have to provide a parameter-less constructor and | |
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35 | * an initialization method (<i>initTrace</i>) if they are to be opened from |
36 | * the Project View. Also, a validation method (<i>validate</i>) has to be | |
37 | * provided to ensure that the trace is of the correct type. | |
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38 | * <p> |
39 | * A trace can be accessed simultaneously from multiple threads by various | |
40 | * application components. To avoid obvious multi-threading issues, the trace | |
41 | * uses an ITmfContext as a synchronization aid for its read operations. | |
42 | * <p> | |
43 | * A proper ITmfContext can be obtained by performing a seek operation on the | |
44 | * trace. Seek operations can be performed for a particular event (by rank or | |
45 | * timestamp) or for a plain trace location. | |
46 | * <p> | |
d337369a | 47 | * <b>Example 1</b>: Process a whole trace |
f17b2f70 | 48 | * <pre> |
7e6347b0 | 49 | * ITmfContext context = trace.seekEvent(0); |
b4f71e4a | 50 | * ITmfEvent event = trace.readEvent(context); |
f17b2f70 | 51 | * while (event != null) { |
d337369a | 52 | * processEvent(event); |
2848c377 | 53 | * event = trace.readNextEvent(context); |
f17b2f70 FC |
54 | * } |
55 | * </pre> | |
56 | * <b>Example 2</b>: Process 50 events starting from the 1000th event | |
57 | * <pre> | |
58 | * int nbEventsRead = 0; | |
59 | * ITmfContext context = trace.seekEvent(1000); | |
2848c377 | 60 | * ITmfEvent event = trace.readNextEvent(context); |
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61 | * while (event != null && nbEventsRead < 50) { |
62 | * nbEventsRead++; | |
d337369a | 63 | * processEvent(event); |
2848c377 | 64 | * event = trace.readNextEvent(context); |
f17b2f70 FC |
65 | * } |
66 | * </pre> | |
67 | * <b>Example 3</b>: Process the events between 2 timestamps (inclusive) | |
68 | * <pre> | |
69 | * ITmfTimestamp startTime = ...; | |
70 | * ITmfTimestamp endTime = ...; | |
71 | * ITmfContext context = trace.seekEvent(startTime); | |
2848c377 | 72 | * ITmfEvent event = trace.readNextEvent(context); |
f17b2f70 | 73 | * while (event != null && event.getTimestamp().compareTo(endTime) <= 0) { |
d337369a | 74 | * processEvent(event); |
2848c377 | 75 | * event = trace.readNextEvent(context); |
f17b2f70 FC |
76 | * } |
77 | * </pre> | |
d337369a | 78 | * A trace is also an event provider so it can process event requests |
7e6347b0 | 79 | * asynchronously (and coalesce compatible, concurrent requests). |
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80 | * <p> |
81 | * </pre> | |
7e6347b0 | 82 | * <b>Example 4</b>: Process a whole trace (see ITmfEventRequest for variants) |
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83 | * <pre> |
84 | * ITmfRequest request = new TmfEventRequest<MyEventType>(MyEventType.class) { | |
85 | * @Override | |
86 | * public void handleData(MyEventType event) { | |
87 | * super.handleData(event); | |
88 | * processEvent(event); | |
89 | * } | |
90 | * @Override | |
91 | * public void handleCompleted() { | |
92 | * finish(); | |
93 | * super.handleCompleted(); | |
94 | * } | |
95 | * }; | |
7e6347b0 | 96 | * |
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97 | * fTrace.handleRequest(request); |
98 | * if (youWant) { | |
99 | * request.waitForCompletion(); | |
100 | * } | |
101 | * </pre> | |
f7703ed6 FC |
102 | * |
103 | * @since 1.0 | |
104 | * @version 1.0 | |
105 | * @author Francois Chouinard | |
106 | * | |
d337369a | 107 | * @see ITmfEvent |
2848c377 | 108 | * @see ITmfDataProvider |
7e6347b0 | 109 | * @see ITmfEventRequest |
f7703ed6 | 110 | * @see TmfTrace |
8c8bf09f | 111 | */ |
f17b2f70 | 112 | public interface ITmfTrace<T extends ITmfEvent> extends ITmfDataProvider<T> { |
12c155f5 | 113 | |
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114 | // ------------------------------------------------------------------------ |
115 | // Initializers | |
116 | // ------------------------------------------------------------------------ | |
085d898f | 117 | |
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118 | /** |
119 | * Initialize a newly instantiated "empty" trace object. This is used to | |
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120 | * properly parameterize an ITmfTrace instantiated with its parameterless |
121 | * constructor. | |
d337369a | 122 | * <p> |
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123 | * Typically, the parameterless constructor will provide the block size |
124 | * and its associated parser and indexer. | |
125 | * | |
126 | * @param resource the trace resource | |
3118edf1 | 127 | * @param path the trace path |
3791b5df | 128 | * @param type the trace event type |
b4f71e4a | 129 | * @throws TmfTraceException |
3118edf1 | 130 | */ |
b4f71e4a | 131 | public void initTrace(IResource resource, String path, Class<T> type) throws TmfTraceException; |
12c155f5 | 132 | |
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133 | /** |
134 | * Validate that the trace is of the correct type. | |
135 | * | |
136 | * @param project the eclipse project | |
137 | * @param path the trace path | |
138 | * | |
139 | * @return true if trace is valid | |
140 | */ | |
141 | public boolean validate(IProject project, String path); | |
12c155f5 | 142 | |
8636b448 | 143 | // ------------------------------------------------------------------------ |
3118edf1 | 144 | // Basic getters |
8636b448 | 145 | // ------------------------------------------------------------------------ |
b0a282fb | 146 | |
abfad0aa | 147 | /** |
25e48683 | 148 | * @return the trace event type |
12c155f5 | 149 | */ |
13cb5f43 | 150 | public Class<T> getEventType(); |
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151 | |
152 | /** | |
25e48683 | 153 | * @return the associated trace resource |
12c155f5 | 154 | */ |
3791b5df | 155 | public IResource getResource(); |
12c155f5 | 156 | |
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157 | /** |
158 | * @return the trace path | |
159 | */ | |
160 | public String getPath(); | |
161 | ||
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162 | /** |
163 | * @return the trace cache size | |
164 | */ | |
165 | public int getCacheSize(); | |
166 | ||
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167 | // ------------------------------------------------------------------------ |
168 | // Trace characteristics getters | |
169 | // ------------------------------------------------------------------------ | |
170 | ||
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171 | /** |
172 | * @return the number of events in the trace | |
173 | */ | |
174 | public long getNbEvents(); | |
175 | ||
176 | /** | |
3118edf1 | 177 | * @return the trace time range |
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178 | */ |
179 | public TmfTimeRange getTimeRange(); | |
180 | ||
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181 | /** |
182 | * @return the timestamp of the first trace event | |
183 | */ | |
4df4581d | 184 | public ITmfTimestamp getStartTime(); |
12c155f5 | 185 | |
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186 | /** |
187 | * @return the timestamp of the last trace event | |
188 | */ | |
4df4581d | 189 | public ITmfTimestamp getEndTime(); |
62d1696a | 190 | |
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191 | /** |
192 | * @return the streaming interval in ms (0 if not a streaming trace) | |
193 | */ | |
194 | public long getStreamingInterval(); | |
195 | ||
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196 | // ------------------------------------------------------------------------ |
197 | // Trace positioning getters | |
198 | // ------------------------------------------------------------------------ | |
1b70b6dc | 199 | |
3118edf1 | 200 | /** |
25e48683 | 201 | * @return the current trace location |
3118edf1 | 202 | */ |
25e48683 | 203 | public ITmfLocation<?> getCurrentLocation(); |
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204 | |
205 | /** | |
25e48683 | 206 | * Returns the ratio (proportion) corresponding to the specified location. |
3791b5df | 207 | * |
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208 | * @param location a trace specific location |
209 | * @return a floating-point number between 0.0 (beginning) and 1.0 (end) | |
3791b5df | 210 | */ |
25e48683 | 211 | public double getLocationRatio(ITmfLocation<?> location); |
3791b5df | 212 | |
8636b448 | 213 | // ------------------------------------------------------------------------ |
7e6347b0 | 214 | // SeekEvent operations (returning a trace context) |
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215 | // ------------------------------------------------------------------------ |
216 | ||
12c155f5 | 217 | /** |
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218 | * Position the trace at the specified (trace specific) location. |
219 | * <p> | |
220 | * A null location is interpreted as seeking for the first event of the | |
221 | * trace. | |
25e48683 | 222 | * <p> |
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223 | * If not null, the location requested must be valid otherwise the returned |
224 | * context is undefined (up to the implementation to recover if possible). | |
25e48683 | 225 | * <p> |
7e6347b0 | 226 | * @param location the trace specific location |
3118edf1 | 227 | * @return a context which can later be used to read the corresponding event |
8c8bf09f | 228 | */ |
7e6347b0 | 229 | public ITmfContext seekEvent(ITmfLocation<?> location); |
12c155f5 | 230 | |
c76c54bb | 231 | /** |
7e6347b0 | 232 | * Position the trace at the 'rank'th event in the trace. |
09e86496 | 233 | * <p> |
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234 | * A rank <= 0 is interpreted as seeking for the first event of the |
235 | * trace. | |
236 | * <p> | |
237 | * If the requested rank is beyond the last trace event, the context | |
238 | * returned will yield a null event if used in a subsequent read. | |
c76c54bb | 239 | * |
7e6347b0 | 240 | * @param rank the event rank |
3118edf1 | 241 | * @return a context which can later be used to read the corresponding event |
c76c54bb | 242 | */ |
7e6347b0 | 243 | public ITmfContext seekEvent(long rank); |
12c155f5 | 244 | |
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245 | /** |
246 | * Position the trace at the first event with the specified timestamp. If | |
247 | * there is no event with the requested timestamp, a context pointing to | |
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248 | * the next chronological event is returned. |
249 | * <p> | |
250 | * A null timestamp is interpreted as seeking for the first event of the | |
251 | * trace. | |
252 | * <p> | |
253 | * If the requested timestamp is beyond the last trace event, the context | |
254 | * returned will yield a null event if used in a subsequent read. | |
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255 | * |
256 | * @param timestamp the timestamp of desired event | |
257 | * @return a context which can later be used to read the corresponding event | |
258 | */ | |
259 | public ITmfContext seekEvent(ITmfTimestamp timestamp); | |
260 | ||
261 | /** | |
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262 | * Position the trace at the event located at the specified ratio in the |
263 | * trace file. | |
09e86496 | 264 | * <p> |
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265 | * The notion of ratio (0.0 <= r <= 1.0) is trace specific and left |
266 | * voluntarily vague. Typically, it would refer to the event proportional | |
267 | * rank (arguably more intuitive) or timestamp in the trace file. | |
3118edf1 | 268 | * |
7e6347b0 | 269 | * @param ratio the proportional 'rank' in the trace |
3118edf1 FC |
270 | * @return a context which can later be used to read the corresponding event |
271 | */ | |
7e6347b0 | 272 | public ITmfContext seekEvent(double ratio); |
3118edf1 | 273 | |
8636b448 | 274 | // ------------------------------------------------------------------------ |
25e48683 | 275 | // Read operations (returning an actual event) |
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276 | // ------------------------------------------------------------------------ |
277 | ||
278 | /** | |
3118edf1 FC |
279 | * Return the event pointed by the supplied context (or null if no event |
280 | * left) and updates the context to point the next event. | |
8636b448 | 281 | * |
25e48683 FC |
282 | * @param context the read context (will be updated) |
283 | * @return the event pointed to by the context | |
8636b448 | 284 | */ |
b4f71e4a | 285 | public ITmfEvent readNextEvent(ITmfContext context); |
8636b448 | 286 | |
8c8bf09f | 287 | } |