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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; |
8c8bf09f ASL |
24 | |
25 | /** | |
146a887c | 26 | * <b><u>ITmfTrace</u></b> |
8c8bf09f | 27 | * <p> |
f17b2f70 FC |
28 | * The event stream structure in TMF. In its basic form, a trace has: |
29 | * <ul> | |
30 | * <li> the associated Eclipse resource | |
31 | * <li> the path to its location on the file system | |
32 | * <li> the type of the events it contains | |
33 | * <li> the number of events it contains | |
34 | * <li> the time range (span) of the events it contains | |
35 | * </ul> | |
36 | * Concrete ITmfTrace classes have to provide a parameter-less constructor and | |
37 | * an initialization method (initTace())if they are to be opened from the | |
38 | * Project View. Also, a validation (validate()) method has to be provided to | |
39 | * ensure that the trace is of the correct type. | |
40 | * <p> | |
41 | * A trace can be accessed simultaneously from multiple threads by various | |
42 | * application components. To avoid obvious multi-threading issues, the trace | |
43 | * uses an ITmfContext as a synchronization aid for its read operations. | |
44 | * <p> | |
45 | * A proper ITmfContext can be obtained by performing a seek operation on the | |
46 | * trace. Seek operations can be performed for a particular event (by rank or | |
47 | * timestamp) or for a plain trace location. | |
48 | * <p> | |
49 | * <b>Example 1</b>: Read a whole trace | |
50 | * <pre> | |
51 | * ITmfContext context = trace.seekLocationt(null); | |
52 | * ITmfEvent event = trace.getEvent(context); | |
53 | * while (event != null) { | |
54 | * // Do something ... | |
55 | * event = trace.getEvent(context); | |
56 | * } | |
57 | * </pre> | |
58 | * <b>Example 2</b>: Process 50 events starting from the 1000th event | |
59 | * <pre> | |
60 | * int nbEventsRead = 0; | |
61 | * ITmfContext context = trace.seekEvent(1000); | |
62 | * ITmfEvent event = trace.getEvent(context); | |
63 | * while (event != null && nbEventsRead < 50) { | |
64 | * nbEventsRead++; | |
65 | * // Do something ... | |
66 | * event = trace.getEvent(context); | |
67 | * } | |
68 | * </pre> | |
69 | * <b>Example 3</b>: Process the events between 2 timestamps (inclusive) | |
70 | * <pre> | |
71 | * ITmfTimestamp startTime = ...; | |
72 | * ITmfTimestamp endTime = ...; | |
73 | * ITmfContext context = trace.seekEvent(startTime); | |
74 | * ITmfEvent event = trace.getEvent(context); | |
75 | * while (event != null && event.getTimestamp().compareTo(endTime) <= 0) { | |
76 | * // Do something ... | |
77 | * event = trace.getEvent(context); | |
78 | * } | |
79 | * </pre> | |
8c8bf09f | 80 | */ |
f17b2f70 | 81 | public interface ITmfTrace<T extends ITmfEvent> extends ITmfDataProvider<T> { |
12c155f5 | 82 | |
8636b448 FC |
83 | // ------------------------------------------------------------------------ |
84 | // Initializers | |
85 | // ------------------------------------------------------------------------ | |
085d898f | 86 | |
3118edf1 FC |
87 | /** |
88 | * Initialize a newly instantiated "empty" trace object. This is used to | |
25e48683 FC |
89 | * properly parameterize an ITmfTrace instantiated with its parameterless |
90 | * constructor. | |
3118edf1 | 91 | * |
25e48683 FC |
92 | * Typically, the parameterless constructor will provide the block size |
93 | * and its associated parser and indexer. | |
94 | * | |
95 | * @param resource the trace resource | |
3118edf1 | 96 | * @param path the trace path |
3791b5df | 97 | * @param type the trace event type |
3118edf1 FC |
98 | * @throws FileNotFoundException |
99 | */ | |
25e48683 | 100 | public void initTrace(IResource resource, String path, Class<T> type) throws FileNotFoundException; |
12c155f5 | 101 | |
3118edf1 FC |
102 | /** |
103 | * Validate that the trace is of the correct type. | |
104 | * | |
105 | * @param project the eclipse project | |
106 | * @param path the trace path | |
107 | * | |
108 | * @return true if trace is valid | |
109 | */ | |
110 | public boolean validate(IProject project, String path); | |
12c155f5 | 111 | |
8636b448 | 112 | // ------------------------------------------------------------------------ |
3118edf1 | 113 | // Basic getters |
8636b448 | 114 | // ------------------------------------------------------------------------ |
b0a282fb | 115 | |
abfad0aa | 116 | /** |
25e48683 | 117 | * @return the trace event type |
12c155f5 | 118 | */ |
25e48683 | 119 | public Class<T> getType(); |
12c155f5 FC |
120 | |
121 | /** | |
25e48683 | 122 | * @return the associated trace resource |
12c155f5 | 123 | */ |
3791b5df | 124 | public IResource getResource(); |
12c155f5 | 125 | |
25e48683 FC |
126 | /** |
127 | * @return the trace path | |
128 | */ | |
129 | public String getPath(); | |
130 | ||
20658947 FC |
131 | /** |
132 | * @return the trace cache size | |
133 | */ | |
134 | public int getCacheSize(); | |
135 | ||
25e48683 FC |
136 | // ------------------------------------------------------------------------ |
137 | // Trace characteristics getters | |
138 | // ------------------------------------------------------------------------ | |
139 | ||
12c155f5 FC |
140 | /** |
141 | * @return the number of events in the trace | |
142 | */ | |
143 | public long getNbEvents(); | |
144 | ||
145 | /** | |
3118edf1 | 146 | * @return the trace time range |
12c155f5 FC |
147 | */ |
148 | public TmfTimeRange getTimeRange(); | |
149 | ||
3118edf1 FC |
150 | /** |
151 | * @return the timestamp of the first trace event | |
152 | */ | |
4df4581d | 153 | public ITmfTimestamp getStartTime(); |
12c155f5 | 154 | |
3118edf1 FC |
155 | /** |
156 | * @return the timestamp of the last trace event | |
157 | */ | |
4df4581d | 158 | public ITmfTimestamp getEndTime(); |
62d1696a | 159 | |
25e48683 FC |
160 | // ------------------------------------------------------------------------ |
161 | // Trace positioning getters | |
162 | // ------------------------------------------------------------------------ | |
1b70b6dc | 163 | |
3118edf1 | 164 | /** |
25e48683 | 165 | * @return the current trace location |
3118edf1 | 166 | */ |
25e48683 | 167 | public ITmfLocation<?> getCurrentLocation(); |
3791b5df FC |
168 | |
169 | /** | |
25e48683 | 170 | * Returns the ratio (proportion) corresponding to the specified location. |
3791b5df | 171 | * |
25e48683 FC |
172 | * @param location a trace specific location |
173 | * @return a floating-point number between 0.0 (beginning) and 1.0 (end) | |
3791b5df | 174 | */ |
25e48683 | 175 | public double getLocationRatio(ITmfLocation<?> location); |
3791b5df | 176 | |
8636b448 | 177 | // ------------------------------------------------------------------------ |
25e48683 | 178 | // Seek operations (returning a reading context) |
8636b448 FC |
179 | // ------------------------------------------------------------------------ |
180 | ||
12c155f5 | 181 | /** |
3118edf1 | 182 | * Position the trace at the specified location. The null location |
25e48683 FC |
183 | * is used to indicate that the first trace event is requested. |
184 | * <p> | |
185 | * <ul> | |
186 | * <li> a <b>null</b> location returns the context of the first event | |
187 | * <li> an invalid location, including beyond the last event, returns a null context | |
188 | * </ul> | |
189 | * <p> | |
3118edf1 FC |
190 | * @param location the trace specific location (null for 1st event) |
191 | * @return a context which can later be used to read the corresponding event | |
8c8bf09f | 192 | */ |
34ccf9a9 | 193 | public ITmfContext seekLocation(ITmfLocation<?> location); |
12c155f5 | 194 | |
c76c54bb | 195 | /** |
3118edf1 FC |
196 | * Position the trace at the event located at the specified ratio in the |
197 | * trace file. | |
09e86496 | 198 | * <p> |
3118edf1 FC |
199 | * The notion of ratio (0.0 <= r <= 1.0) is trace specific and left |
200 | * voluntarily vague. Typically, it would refer to the event proportional | |
25e48683 | 201 | * rank (arguably more intuitive) or timestamp in the trace file. |
c76c54bb | 202 | * |
3118edf1 FC |
203 | * @param ratio the proportional 'rank' in the trace |
204 | * @return a context which can later be used to read the corresponding event | |
c76c54bb | 205 | */ |
34ccf9a9 | 206 | public ITmfContext seekLocation(double ratio); |
12c155f5 | 207 | |
3118edf1 FC |
208 | /** |
209 | * Position the trace at the first event with the specified timestamp. If | |
210 | * there is no event with the requested timestamp, a context pointing to | |
09e86496 FC |
211 | * the next chronological event is returned. |
212 | * <p> | |
213 | * A null timestamp is interpreted as seeking for the first event of the | |
214 | * trace. | |
215 | * <p> | |
216 | * If the requested timestamp is beyond the last trace event, the context | |
217 | * returned will yield a null event if used in a subsequent read. | |
3118edf1 FC |
218 | * |
219 | * @param timestamp the timestamp of desired event | |
220 | * @return a context which can later be used to read the corresponding event | |
221 | */ | |
222 | public ITmfContext seekEvent(ITmfTimestamp timestamp); | |
223 | ||
224 | /** | |
25e48683 | 225 | * Position the trace at the 'rank'th event in the trace. |
09e86496 FC |
226 | * <p> |
227 | * If the requested rank is beyond the last trace event, the context | |
228 | * returned will yield a null event if used in a subsequent read. | |
3118edf1 FC |
229 | * |
230 | * @param rank the event rank | |
231 | * @return a context which can later be used to read the corresponding event | |
232 | */ | |
233 | public ITmfContext seekEvent(long rank); | |
234 | ||
8636b448 | 235 | // ------------------------------------------------------------------------ |
25e48683 | 236 | // Read operations (returning an actual event) |
8636b448 FC |
237 | // ------------------------------------------------------------------------ |
238 | ||
239 | /** | |
3118edf1 FC |
240 | * Return the event pointed by the supplied context (or null if no event |
241 | * left) and updates the context to point the next event. | |
8636b448 | 242 | * |
25e48683 FC |
243 | * @param context the read context (will be updated) |
244 | * @return the event pointed to by the context | |
8636b448 FC |
245 | */ |
246 | public ITmfEvent getNextEvent(ITmfContext context); | |
247 | ||
248 | /** | |
3118edf1 FC |
249 | * Return the event pointed by the supplied context (or null if no event |
250 | * left) and *does not* update the context. | |
8636b448 | 251 | * |
3118edf1 | 252 | * @param context the read context |
8636b448 FC |
253 | * @return the next event in the stream |
254 | */ | |
255 | public ITmfEvent parseEvent(ITmfContext context); | |
256 | ||
25e48683 FC |
257 | // ------------------------------------------------------------------------ |
258 | // ------------------------------------------------------------------------ | |
3791b5df | 259 | |
abfad0aa | 260 | /** |
25e48683 | 261 | * @return the streaming interval in ms (0 if not a streaming trace) |
abfad0aa | 262 | */ |
25e48683 | 263 | public long getStreamingInterval(); |
085d898f | 264 | |
8c8bf09f | 265 | } |