Commit | Line | Data |
---|---|---|
8c8bf09f | 1 | /******************************************************************************* |
61759503 | 2 | * Copyright (c) 2009, 2013 Ericsson |
0283f7ff | 3 | * |
8c8bf09f ASL |
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 | |
0283f7ff | 8 | * |
8c8bf09f ASL |
9 | * Contributors: |
10 | * Francois Chouinard - Initial API and implementation | |
fd3f1eff | 11 | * Alexandre Montplaisir - Consolidate constructors, merge with TmfDataRequest |
8c8bf09f ASL |
12 | *******************************************************************************/ |
13 | ||
6c13869b | 14 | package org.eclipse.linuxtools.tmf.core.request; |
8c8bf09f | 15 | |
fd3f1eff AM |
16 | import java.util.concurrent.CountDownLatch; |
17 | ||
5500a7f0 | 18 | import org.eclipse.linuxtools.internal.tmf.core.TmfCoreTracer; |
72f1e62a | 19 | import org.eclipse.linuxtools.tmf.core.event.ITmfEvent; |
3bd46eef | 20 | import org.eclipse.linuxtools.tmf.core.timestamp.TmfTimeRange; |
8c8bf09f ASL |
21 | |
22 | /** | |
fd3f1eff AM |
23 | * TmfEventRequest's are used to obtain series of events from an event provider. |
24 | * Open ranges can be used, especially for continuous streaming. | |
25 | * <p> | |
26 | * The request is processed asynchronously by a TmfEventProvider and, as events | |
27 | * become available, handleData() is invoked synchronously for each one. | |
28 | * <p> | |
29 | * The TmfEventProvider indicates that the request is completed by calling | |
30 | * done(). The request can be cancelled at any time with cancel(). | |
31 | * <p> | |
32 | * Typical usage: | |
33 | * | |
34 | * <pre><code> | |
35 | * TmfEventRequest request = new TmfEventRequest(DataType.class, range, startIndex, nbEvents, priority) { | |
36 | * | |
37 | * public void handleData(ITmfEvent event) { | |
38 | * // do something with the event | |
39 | * } | |
40 | * | |
41 | * public void handleSuccess() { | |
42 | * // callback for when the request completes successfully | |
43 | * } | |
44 | * | |
45 | * public void handleFailure() { | |
46 | * // callback for when the request fails due to an error | |
47 | * } | |
48 | * | |
49 | * public void handleCancel() { | |
50 | * // callback for when the request is cancelled via .cancel() | |
51 | * } | |
52 | * | |
53 | * }; | |
54 | * | |
55 | * eventProvider.sendRequest(request); | |
56 | * </code></pre> | |
57 | * | |
58 | * | |
59 | * TODO: Implement request failures (codes, etc...) | |
0283f7ff | 60 | * |
8fd82db5 | 61 | * @author Francois Chouinard |
fd3f1eff | 62 | * @since 3.0 |
8c8bf09f | 63 | */ |
fd3f1eff AM |
64 | public abstract class TmfEventRequest implements ITmfEventRequest { |
65 | ||
66 | // ------------------------------------------------------------------------ | |
67 | // Constants | |
68 | // ------------------------------------------------------------------------ | |
69 | ||
fd3f1eff | 70 | private static int fRequestNumber = 0; |
8c8bf09f ASL |
71 | |
72 | // ------------------------------------------------------------------------ | |
73 | // Attributes | |
74 | // ------------------------------------------------------------------------ | |
75 | ||
fd3f1eff AM |
76 | private final Class<? extends ITmfEvent> fDataType; |
77 | private final ExecutionType fExecType; | |
78 | ||
79 | /** A unique request ID */ | |
80 | private final int fRequestId; | |
81 | ||
82 | /** The requested events time range */ | |
83 | private final TmfTimeRange fRange; | |
84 | ||
c4767854 AM |
85 | /** The index (rank) of the requested event |
86 | * @since 3.0*/ | |
fd3f1eff AM |
87 | protected long fIndex; |
88 | ||
c4767854 AM |
89 | /** The number of requested events (ALL_DATA for all) |
90 | * @since 3.0*/ | |
fd3f1eff AM |
91 | protected int fNbRequested; |
92 | ||
93 | /** The number of reads so far */ | |
94 | private int fNbRead; | |
95 | ||
96 | private final CountDownLatch startedLatch = new CountDownLatch(1); | |
97 | private final CountDownLatch completedLatch = new CountDownLatch(1); | |
98 | ||
99 | private boolean fRequestRunning; | |
100 | private boolean fRequestCompleted; | |
101 | private boolean fRequestFailed; | |
102 | private boolean fRequestCanceled; | |
8c8bf09f ASL |
103 | |
104 | // ------------------------------------------------------------------------ | |
fd3f1eff | 105 | // Constructors |
8c8bf09f ASL |
106 | // ------------------------------------------------------------------------ |
107 | ||
108 | /** | |
fd3f1eff AM |
109 | * Request 'n' events of a given type, for the *whole* trace, at the given |
110 | * priority. | |
111 | * | |
112 | * @param dataType | |
113 | * The requested data type. | |
114 | * @param index | |
115 | * The index of the first event to retrieve. You can use '0' to | |
116 | * start at the beginning of the trace. | |
117 | * @param nbRequested | |
118 | * The number of events requested. You can use | |
119 | * {@link TmfEventRequest#ALL_DATA} to indicate you want all | |
120 | * events in the trace. | |
121 | * @param priority | |
122 | * The requested execution priority. | |
123 | */ | |
124 | public TmfEventRequest(Class<? extends ITmfEvent> dataType, | |
125 | long index, | |
126 | int nbRequested, | |
127 | ExecutionType priority) { | |
128 | this(dataType, TmfTimeRange.ETERNITY, index, nbRequested, priority); | |
129 | } | |
130 | ||
131 | /** | |
132 | * Request 'n' events of a given type, for the given time range, at the | |
133 | * given priority. | |
0283f7ff | 134 | * |
7184fc40 AM |
135 | * @param dataType |
136 | * The requested data type. | |
137 | * @param range | |
138 | * The time range of the requested events. You can use | |
139 | * {@link TmfTimeRange#ETERNITY} to indicate you want to cover | |
140 | * the whole trace. | |
141 | * @param index | |
142 | * The index of the first event to retrieve. You can use '0' to | |
143 | * start at the beginning of the trace. | |
144 | * @param nbRequested | |
145 | * The number of events requested. You can use | |
146 | * {@link TmfEventRequest#ALL_DATA} to indicate you want all | |
147 | * events in the time range. | |
7184fc40 AM |
148 | * @param priority |
149 | * The requested execution priority. | |
0d9a6d76 | 150 | */ |
7184fc40 AM |
151 | public TmfEventRequest(Class<? extends ITmfEvent> dataType, |
152 | TmfTimeRange range, | |
153 | long index, | |
154 | int nbRequested, | |
7184fc40 | 155 | ExecutionType priority) { |
fd3f1eff AM |
156 | |
157 | fRequestId = fRequestNumber++; | |
158 | fDataType = dataType; | |
159 | fIndex = index; | |
160 | fNbRequested = nbRequested; | |
161 | fExecType = priority; | |
7184fc40 | 162 | fRange = range; |
fd3f1eff AM |
163 | fNbRead = 0; |
164 | ||
165 | fRequestRunning = false; | |
166 | fRequestCompleted = false; | |
167 | fRequestFailed = false; | |
168 | fRequestCanceled = false; | |
90891c08 | 169 | |
fd3f1eff | 170 | /* Setup the request tracing if it's enabled */ |
5500a7f0 | 171 | if (TmfCoreTracer.isRequestTraced()) { |
90891c08 FC |
172 | String type = getClass().getName(); |
173 | type = type.substring(type.lastIndexOf('.') + 1); | |
174 | @SuppressWarnings("nls") | |
0283f7ff | 175 | String message = "CREATED " |
fd3f1eff | 176 | + (getExecType() == ExecutionType.BACKGROUND ? "(BG)" : "(FG)") |
0283f7ff | 177 | + " Type=" + type + " Index=" + getIndex() + " NbReq=" + getNbRequested() |
4cf201de | 178 | + " Range=" + getRange() |
90891c08 | 179 | + " DataType=" + getDataType().getSimpleName(); |
5500a7f0 | 180 | TmfCoreTracer.traceRequest(this, message); |
90891c08 | 181 | } |
8c8bf09f ASL |
182 | } |
183 | ||
fd3f1eff AM |
184 | /** |
185 | * Resets the request counter (used for testing) | |
186 | */ | |
187 | public static void reset() { | |
188 | fRequestNumber = 0; | |
189 | } | |
190 | ||
8c8bf09f ASL |
191 | // ------------------------------------------------------------------------ |
192 | // Accessors | |
193 | // ------------------------------------------------------------------------ | |
194 | ||
fd3f1eff AM |
195 | @Override |
196 | public int getRequestId() { | |
197 | return fRequestId; | |
198 | } | |
199 | ||
200 | @Override | |
201 | public long getIndex() { | |
202 | return fIndex; | |
203 | } | |
204 | ||
c4767854 AM |
205 | /** |
206 | * @since 3.0 | |
207 | */ | |
fd3f1eff AM |
208 | @Override |
209 | public ExecutionType getExecType() { | |
210 | return fExecType; | |
211 | } | |
212 | ||
213 | @Override | |
214 | public int getNbRequested() { | |
215 | return fNbRequested; | |
216 | } | |
217 | ||
218 | @Override | |
219 | public synchronized int getNbRead() { | |
220 | return fNbRead; | |
221 | } | |
222 | ||
223 | @Override | |
224 | public synchronized boolean isRunning() { | |
225 | return fRequestRunning; | |
226 | } | |
227 | ||
228 | @Override | |
229 | public synchronized boolean isCompleted() { | |
230 | return fRequestCompleted; | |
231 | } | |
232 | ||
233 | @Override | |
234 | public synchronized boolean isFailed() { | |
235 | return fRequestFailed; | |
236 | } | |
237 | ||
238 | @Override | |
239 | public synchronized boolean isCancelled() { | |
240 | return fRequestCanceled; | |
241 | } | |
242 | ||
243 | @Override | |
244 | public Class<? extends ITmfEvent> getDataType() { | |
245 | return fDataType; | |
246 | } | |
247 | ||
d4011df2 | 248 | @Override |
7184fc40 | 249 | public TmfTimeRange getRange() { |
5419a136 | 250 | return fRange; |
8c8bf09f ASL |
251 | } |
252 | ||
a79913eb FC |
253 | // ------------------------------------------------------------------------ |
254 | // Setters | |
255 | // ------------------------------------------------------------------------ | |
256 | ||
257 | /** | |
fd3f1eff AM |
258 | * This method is called by the event provider to set the index |
259 | * corresponding to the time range start time | |
0283f7ff | 260 | * |
7184fc40 | 261 | * @param index |
fd3f1eff | 262 | * The start time index |
a79913eb | 263 | */ |
fd3f1eff AM |
264 | protected void setIndex(int index) { |
265 | fIndex = index; | |
266 | } | |
267 | ||
a79913eb | 268 | @Override |
7184fc40 AM |
269 | public void setStartIndex(int index) { |
270 | setIndex(index); | |
a79913eb FC |
271 | } |
272 | ||
fd3f1eff AM |
273 | // ------------------------------------------------------------------------ |
274 | // Operators | |
275 | // ------------------------------------------------------------------------ | |
276 | ||
277 | @Override | |
278 | public void handleData(ITmfEvent event) { | |
41f3b36b | 279 | fNbRead++; |
fd3f1eff AM |
280 | } |
281 | ||
282 | @Override | |
283 | public void handleStarted() { | |
284 | if (TmfCoreTracer.isRequestTraced()) { | |
285 | TmfCoreTracer.traceRequest(this, "STARTED"); //$NON-NLS-1$ | |
286 | } | |
287 | } | |
288 | ||
289 | @Override | |
290 | public void handleCompleted() { | |
291 | boolean requestFailed = false; | |
292 | boolean requestCanceled = false; | |
293 | synchronized (this) { | |
294 | requestFailed = fRequestFailed; | |
295 | requestCanceled = fRequestCanceled; | |
296 | } | |
297 | ||
298 | if (requestFailed) { | |
299 | handleFailure(); | |
300 | } else if (requestCanceled) { | |
301 | handleCancel(); | |
302 | } else { | |
303 | handleSuccess(); | |
304 | } | |
305 | if (TmfCoreTracer.isRequestTraced()) { | |
306 | TmfCoreTracer.traceRequest(this, "COMPLETED (" + fNbRead + " events read)"); //$NON-NLS-1$ //$NON-NLS-2$ | |
307 | } | |
308 | } | |
309 | ||
310 | @Override | |
311 | public void handleSuccess() { | |
312 | if (TmfCoreTracer.isRequestTraced()) { | |
313 | TmfCoreTracer.traceRequest(this, "SUCCEEDED"); //$NON-NLS-1$ | |
314 | } | |
315 | } | |
316 | ||
317 | @Override | |
318 | public void handleFailure() { | |
319 | if (TmfCoreTracer.isRequestTraced()) { | |
320 | TmfCoreTracer.traceRequest(this, "FAILED"); //$NON-NLS-1$ | |
321 | } | |
322 | } | |
323 | ||
324 | @Override | |
325 | public void handleCancel() { | |
326 | if (TmfCoreTracer.isRequestTraced()) { | |
327 | TmfCoreTracer.traceRequest(this, "CANCELLED"); //$NON-NLS-1$ | |
328 | } | |
329 | } | |
330 | ||
331 | /** | |
332 | * To suspend the client thread until the request starts (or is canceled). | |
333 | * | |
334 | * @throws InterruptedException | |
335 | * If the thread was interrupted while waiting | |
336 | */ | |
337 | public void waitForStart() throws InterruptedException { | |
338 | while (!fRequestRunning) { | |
339 | startedLatch.await(); | |
340 | } | |
341 | } | |
342 | ||
343 | @Override | |
344 | public void waitForCompletion() throws InterruptedException { | |
345 | while (!fRequestCompleted) { | |
346 | completedLatch.await(); | |
347 | } | |
348 | } | |
349 | ||
350 | @Override | |
351 | public void start() { | |
352 | synchronized (this) { | |
353 | fRequestRunning = true; | |
354 | } | |
355 | handleStarted(); | |
356 | startedLatch.countDown(); | |
357 | } | |
358 | ||
359 | @Override | |
360 | public void done() { | |
361 | synchronized (this) { | |
362 | if (!fRequestCompleted) { | |
363 | fRequestRunning = false; | |
364 | fRequestCompleted = true; | |
365 | } else { | |
366 | return; | |
367 | } | |
368 | } | |
369 | try { | |
370 | handleCompleted(); | |
371 | } finally { | |
372 | completedLatch.countDown(); | |
373 | } | |
374 | } | |
375 | ||
376 | @Override | |
377 | public void fail() { | |
378 | synchronized (this) { | |
379 | fRequestFailed = true; | |
380 | } | |
381 | done(); | |
382 | } | |
383 | ||
384 | @Override | |
385 | public void cancel() { | |
386 | synchronized (this) { | |
387 | fRequestCanceled = true; | |
388 | } | |
389 | done(); | |
390 | } | |
391 | ||
2fb2eb37 FC |
392 | // ------------------------------------------------------------------------ |
393 | // Object | |
394 | // ------------------------------------------------------------------------ | |
395 | ||
396 | @Override | |
397 | // All requests have a unique id | |
398 | public int hashCode() { | |
7184fc40 | 399 | return getRequestId(); |
2fb2eb37 FC |
400 | } |
401 | ||
402 | @Override | |
403 | public boolean equals(Object other) { | |
7184fc40 AM |
404 | if (other instanceof TmfEventRequest) { |
405 | TmfEventRequest request = (TmfEventRequest) other; | |
fd3f1eff AM |
406 | return request.fDataType == fDataType |
407 | && request.fIndex == fIndex | |
408 | && request.fNbRequested == fNbRequested | |
409 | && request.fRange.equals(fRange); | |
7184fc40 AM |
410 | } |
411 | return false; | |
2fb2eb37 FC |
412 | } |
413 | ||
414 | @Override | |
415 | public String toString() { | |
b1b156f3 PT |
416 | String name = getClass().getName(); |
417 | int dot = name.lastIndexOf('.'); | |
418 | if (dot >= 0) { | |
419 | name = name.substring(dot + 1); | |
420 | } | |
fd3f1eff AM |
421 | return '[' + name + '(' + getRequestId() + ',' + getDataType().getSimpleName() + |
422 | ',' + getExecType() + ',' + getRange() + ',' + getIndex() + | |
423 | ',' + getNbRequested() + ")]"; //$NON-NLS-1$ | |
2fb2eb37 FC |
424 | } |
425 | ||
8c8bf09f | 426 | } |