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8c8bf09f | 1 | /******************************************************************************* |
e31e01e8 | 2 | * Copyright (c) 2009, 2010 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 | |
11 | *******************************************************************************/ | |
12 | ||
13 | package org.eclipse.linuxtools.tmf.request; | |
14 | ||
ce785d7d | 15 | import org.eclipse.linuxtools.tmf.Tracer; |
e31e01e8 | 16 | import org.eclipse.linuxtools.tmf.event.TmfData; |
8c8bf09f ASL |
17 | |
18 | /** | |
19 | * <b><u>TmfDataRequest</u></b> | |
20 | * <p> | |
21 | * TmfDataRequests are used to obtain blocks of contiguous data from a data | |
e31e01e8 | 22 | * provider. Open ranges can be used, especially for continuous streaming. |
8c8bf09f | 23 | * <p> |
e31e01e8 FC |
24 | * The request is processed asynchronously by a TmfProvider and, as blocks |
25 | * of data become available, handleData() is invoked synchronously for each | |
26 | * block. Upon return, the data instances go out of scope and become eligible | |
27 | * for gc. It is is thus the responsibility of the requester to either clone | |
28 | * or keep a reference to the data it wishes to track specifically. | |
8c8bf09f | 29 | * <p> |
e31e01e8 FC |
30 | * This data block approach is used to avoid busting the heap for very |
31 | * large trace files. The block size is configurable. | |
8c8bf09f | 32 | * <p> |
e31e01e8 FC |
33 | * The TmfProvider indicates that the request is completed by calling done(). |
34 | * The request can be canceled at any time with cancel(). | |
8c8bf09f ASL |
35 | * <p> |
36 | * Typical usage: | |
37 | *<pre><code><i>TmfTimeWindow range = new TmfTimewindow(...); | |
e31e01e8 | 38 | *TmfDataRequest<DataType[]> request = new TmfDataRequest<DataType[]>(DataType.class, 0, NB_EVENTS, BLOCK_SIZE) { |
0ab46cd3 | 39 | * public void handleData() { |
8c8bf09f ASL |
40 | * DataType[] data = request.getData(); |
41 | * for (DataType e : data) { | |
42 | * // do something | |
43 | * } | |
44 | * } | |
0ab46cd3 FC |
45 | * public void handleSuccess() { |
46 | * // do something | |
47 | * } | |
48 | * } | |
49 | * public void handleFailure() { | |
50 | * // do something | |
51 | * } | |
52 | * } | |
53 | * public void handleCancel() { | |
54 | * // do something | |
55 | * } | |
56 | * } | |
8c8bf09f ASL |
57 | *}; |
58 | *fProcessor.process(request, true); | |
59 | *</i></code></pre> | |
60 | * | |
e31e01e8 FC |
61 | * TODO: Consider decoupling from "time range", "rank", etc and for the more |
62 | * generic notion of "criteria". This would allow to extend for "time range", etc | |
63 | * instead of providing specialized constructors. This also means removing the | |
64 | * criteria info from the data structure (with the possible exception of fNbRequested). | |
65 | * The nice thing about it is that it would prepare us well for the coming generation | |
66 | * of analysis tools. | |
0ab46cd3 FC |
67 | * |
68 | * TODO: Implement request failures (codes, etc...) | |
8c8bf09f | 69 | */ |
951d134a | 70 | public abstract class TmfDataRequest<T extends TmfData> implements ITmfDataRequest<T> { |
8c8bf09f | 71 | |
e31e01e8 | 72 | // ------------------------------------------------------------------------ |
8c8bf09f | 73 | // Constants |
e31e01e8 | 74 | // ------------------------------------------------------------------------ |
8c8bf09f ASL |
75 | |
76 | // The default maximum number of events per chunk | |
77 | public static final int DEFAULT_BLOCK_SIZE = 1000; | |
78 | ||
79 | // The request count for all the events | |
e31e01e8 | 80 | public static final int ALL_DATA = Integer.MAX_VALUE; |
8c8bf09f | 81 | |
fc6ccf6f FC |
82 | private static int fRequestNumber = 0; |
83 | ||
e31e01e8 | 84 | // ------------------------------------------------------------------------ |
8c8bf09f | 85 | // Attributes |
e31e01e8 | 86 | // ------------------------------------------------------------------------ |
8c8bf09f | 87 | |
550d787e FC |
88 | private final Class<T> fDataType; |
89 | private final ExecutionType fExecType; | |
90 | private final int fRequestId; // A unique request ID | |
91 | private final int fIndex; // The index (rank) of the requested event | |
92 | private final int fNbRequested; // The number of requested events (ALL_DATA for all) | |
f9673903 | 93 | private int fNbRead; // The number of reads so far |
8c8bf09f | 94 | |
9b635e61 | 95 | private final Object lock; |
550d787e FC |
96 | private boolean fRequestRunning = false; |
97 | private boolean fRequestCompleted = false; | |
98 | private boolean fRequestFailed = false; | |
99 | private boolean fRequestCanceled = false; | |
8c8bf09f | 100 | |
e31e01e8 | 101 | // ------------------------------------------------------------------------ |
8c8bf09f | 102 | // Constructors |
e31e01e8 | 103 | // ------------------------------------------------------------------------ |
8c8bf09f | 104 | |
2fb2eb37 FC |
105 | /** |
106 | * Resets the request counter (used for testing) | |
107 | */ | |
108 | public static void reset() { | |
109 | fRequestNumber = 0; | |
110 | } | |
111 | ||
8c8bf09f | 112 | /** |
e31e01e8 | 113 | * Default constructor |
2fb2eb37 FC |
114 | * |
115 | * @param dataType the requested data type | |
8c8bf09f | 116 | */ |
951d134a | 117 | public TmfDataRequest(Class<T> dataType) { |
f6b14ce2 | 118 | this(dataType, 0, ALL_DATA, DEFAULT_BLOCK_SIZE, ExecutionType.FOREGROUND); |
550d787e FC |
119 | } |
120 | ||
121 | public TmfDataRequest(Class<T> dataType, ExecutionType execType) { | |
122 | this(dataType, 0, ALL_DATA, DEFAULT_BLOCK_SIZE, execType); | |
8c8bf09f ASL |
123 | } |
124 | ||
125 | /** | |
2fb2eb37 FC |
126 | * @param dataType the requested data type |
127 | * @param nbRequested the number of data items requested | |
8c8bf09f | 128 | */ |
951d134a | 129 | public TmfDataRequest(Class<T> dataType, int index) { |
f6b14ce2 | 130 | this(dataType, index, ALL_DATA, DEFAULT_BLOCK_SIZE, ExecutionType.FOREGROUND); |
550d787e FC |
131 | } |
132 | ||
133 | public TmfDataRequest(Class<T> dataType, int index, ExecutionType execType) { | |
134 | this(dataType, index, ALL_DATA, DEFAULT_BLOCK_SIZE, execType); | |
8c8bf09f ASL |
135 | } |
136 | ||
137 | /** | |
2fb2eb37 FC |
138 | * @param dataType the requested data type |
139 | * @param index the index (rank) of the first event requested | |
140 | * @param blockSize the number of data items per block | |
8c8bf09f | 141 | */ |
951d134a | 142 | public TmfDataRequest(Class<T> dataType, int index, int nbRequested) { |
f6b14ce2 | 143 | this(dataType, index, nbRequested, DEFAULT_BLOCK_SIZE, ExecutionType.FOREGROUND); |
550d787e FC |
144 | } |
145 | ||
146 | public TmfDataRequest(Class<T> dataType, int index, int nbRequested, ExecutionType execType) { | |
147 | this(dataType, index, nbRequested, DEFAULT_BLOCK_SIZE, execType); | |
8c8bf09f ASL |
148 | } |
149 | ||
150 | /** | |
2fb2eb37 FC |
151 | * @param dataType the requested data type |
152 | * @param index the index (rank) of the first event requested | |
153 | * @param nbRequested the number of data items requested | |
154 | * @param blockSize the number of data items per block | |
8c8bf09f | 155 | */ |
951d134a | 156 | public TmfDataRequest(Class<T> dataType, int index, int nbRequested, int blockSize) { |
f6b14ce2 | 157 | this(dataType, index, nbRequested, blockSize, ExecutionType.FOREGROUND); |
550d787e FC |
158 | } |
159 | ||
160 | public TmfDataRequest(Class<T> dataType, int index, int nbRequested, int blockSize, ExecutionType execType) { | |
fc6ccf6f | 161 | fRequestId = fRequestNumber++; |
e31e01e8 FC |
162 | fDataType = dataType; |
163 | fIndex = index; | |
164 | fNbRequested = nbRequested; | |
550d787e | 165 | fExecType = execType; |
e31e01e8 | 166 | fNbRead = 0; |
2fb2eb37 | 167 | lock = new Object(); |
550d787e | 168 | if (Tracer.isRequestTraced()) Tracer.traceRequest(this, "created"); |
2fb2eb37 FC |
169 | } |
170 | ||
171 | /** | |
172 | * Copy constructor | |
173 | */ | |
174 | @SuppressWarnings("unused") | |
175 | private TmfDataRequest(TmfDataRequest<T> other) { | |
550d787e | 176 | this(null, 0, ALL_DATA, DEFAULT_BLOCK_SIZE); |
8c8bf09f | 177 | } |
951d134a | 178 | |
e31e01e8 | 179 | // ------------------------------------------------------------------------ |
165c977c | 180 | // Accessors |
e31e01e8 | 181 | // ------------------------------------------------------------------------ |
8c8bf09f | 182 | |
fc6ccf6f FC |
183 | /** |
184 | * @return the request ID | |
185 | */ | |
2fb2eb37 | 186 | public int getRequestId() { |
fc6ccf6f FC |
187 | return fRequestId; |
188 | } | |
189 | ||
28b94d61 | 190 | /** |
951d134a | 191 | * @return the index of the first event requested |
28b94d61 | 192 | */ |
951d134a | 193 | public int getIndex() { |
28b94d61 FC |
194 | return fIndex; |
195 | } | |
196 | ||
550d787e FC |
197 | /** |
198 | * @return the index of the first event requested | |
199 | */ | |
200 | public ExecutionType getExecType() { | |
201 | return fExecType; | |
202 | } | |
203 | ||
8c8bf09f | 204 | /** |
e31e01e8 | 205 | * @return the number of requested events (ALL_DATA = all) |
8c8bf09f | 206 | */ |
e31e01e8 FC |
207 | public int getNbRequested() { |
208 | return fNbRequested; | |
8c8bf09f ASL |
209 | } |
210 | ||
660c9e60 FC |
211 | /** |
212 | * @return the number of events read so far | |
213 | */ | |
2fb2eb37 | 214 | public synchronized int getNbRead() { |
e31e01e8 | 215 | return fNbRead; |
660c9e60 FC |
216 | } |
217 | ||
550d787e FC |
218 | /** |
219 | * @return indicates if the request is completed | |
220 | */ | |
221 | public boolean isRunning() { | |
222 | return fRequestRunning; | |
223 | } | |
224 | ||
8c8bf09f ASL |
225 | /** |
226 | * @return indicates if the request is completed | |
227 | */ | |
228 | public boolean isCompleted() { | |
229 | return fRequestCompleted; | |
230 | } | |
231 | ||
0ab46cd3 FC |
232 | /** |
233 | * @return indicates if the request is canceled | |
234 | */ | |
235 | public boolean isFailed() { | |
236 | return fRequestFailed; | |
237 | } | |
238 | ||
8c8bf09f ASL |
239 | /** |
240 | * @return indicates if the request is canceled | |
241 | */ | |
242 | public boolean isCancelled() { | |
243 | return fRequestCanceled; | |
244 | } | |
245 | ||
e31e01e8 FC |
246 | /** |
247 | * @return the requested data type | |
248 | */ | |
951d134a | 249 | public Class<T> getDataType() { |
e31e01e8 FC |
250 | return fDataType; |
251 | } | |
252 | ||
253 | // ------------------------------------------------------------------------ | |
8c8bf09f | 254 | // Operators |
e31e01e8 | 255 | // ------------------------------------------------------------------------ |
8c8bf09f ASL |
256 | |
257 | /** | |
660c9e60 | 258 | * Sets the data object to specified value. To be called by the |
8c8bf09f | 259 | * asynchronous method implementor. |
f9673903 | 260 | * |
8c8bf09f ASL |
261 | * @param data Data value to set. |
262 | */ | |
8c8bf09f | 263 | /** |
0ab46cd3 FC |
264 | * Handle a block of incoming data. This method is called every time |
265 | * a block of data becomes available. | |
8c8bf09f ASL |
266 | * |
267 | * - Data items are received in the order they appear in the stream. | |
268 | * - Called by the request processor, in its execution thread, every time a | |
269 | * block of data becomes available. | |
270 | * - Request processor performs a synchronous call to handlePartialResult() | |
271 | * i.e. its execution threads holds until handlePartialData() returns. | |
272 | * - Original data items are disposed of on return i.e. keep a reference | |
273 | * (or a copy) if some persistence is needed between invocations. | |
274 | * - When there is no more data, done() is called. | |
275 | * | |
f9673903 | 276 | * @param events - an events |
8c8bf09f | 277 | */ |
f9673903 FC |
278 | public void handleData(T data) { |
279 | if (data != null) { | |
280 | fNbRead++; | |
281 | } | |
282 | } | |
9aae0442 | 283 | |
550d787e FC |
284 | public void handleStarted() { |
285 | } | |
286 | ||
0ab46cd3 FC |
287 | /** |
288 | * Handle the completion of the request. It is called when there is no more | |
289 | * data available either because: | |
290 | * - the request completed normally | |
291 | * - the request failed | |
292 | * - the request was canceled | |
293 | * | |
294 | * As a convenience, handleXXXX methods are provided. They are meant to be | |
295 | * overridden by the application if it needs to handle these conditions. | |
296 | */ | |
8c8bf09f | 297 | public void handleCompleted() { |
0ab46cd3 | 298 | if (fRequestFailed) { |
550d787e | 299 | if (Tracer.isRequestTraced()) Tracer.traceRequest(this, "failed"); |
0ab46cd3 FC |
300 | handleFailure(); |
301 | } | |
302 | else if (fRequestCanceled) { | |
550d787e | 303 | if (Tracer.isRequestTraced()) Tracer.traceRequest(this, "cancelled"); |
0ab46cd3 FC |
304 | handleCancel(); |
305 | } | |
37c8b509 | 306 | else { |
550d787e | 307 | if (Tracer.isRequestTraced()) Tracer.traceRequest(this, "succeeded"); |
36548af3 | 308 | handleSuccess(); |
37c8b509 | 309 | } |
0ab46cd3 FC |
310 | } |
311 | ||
312 | public void handleSuccess() { | |
313 | } | |
314 | ||
315 | public void handleFailure() { | |
316 | } | |
317 | ||
318 | public void handleCancel() { | |
8c8bf09f ASL |
319 | } |
320 | ||
321 | /** | |
322 | * To suspend the client thread until the request completes (or is | |
323 | * canceled). | |
324 | * | |
325 | * @throws InterruptedException | |
326 | */ | |
2fb2eb37 | 327 | public void waitForCompletion() throws InterruptedException { |
8c8bf09f ASL |
328 | synchronized (lock) { |
329 | while (!fRequestCompleted) | |
2fb2eb37 | 330 | lock.wait(); |
9aae0442 | 331 | } |
9aae0442 ASL |
332 | } |
333 | ||
550d787e FC |
334 | /** |
335 | * Called by the request processor upon starting to service the request. | |
336 | */ | |
337 | public void start() { | |
338 | if (Tracer.isRequestTraced()) Tracer.traceRequest(this, "starting"); | |
339 | synchronized(lock) { | |
340 | fRequestRunning = true; | |
f9673903 | 341 | lock.notifyAll(); |
550d787e FC |
342 | } |
343 | handleStarted(); | |
9b635e61 | 344 | if (Tracer.isRequestTraced()) Tracer.traceRequest(this, "started"); |
550d787e FC |
345 | } |
346 | ||
8c8bf09f | 347 | /** |
0ab46cd3 | 348 | * Called by the request processor upon completion. |
8c8bf09f ASL |
349 | */ |
350 | public void done() { | |
550d787e | 351 | if (Tracer.isRequestTraced()) Tracer.traceRequest(this, "completing"); |
8c8bf09f | 352 | synchronized(lock) { |
9b635e61 FC |
353 | if (!fRequestCompleted) { |
354 | fRequestRunning = false; | |
355 | fRequestCompleted = true; | |
356 | } | |
357 | handleCompleted(); | |
f9673903 | 358 | lock.notifyAll(); |
8c8bf09f | 359 | } |
8c8bf09f ASL |
360 | } |
361 | ||
362 | /** | |
0ab46cd3 FC |
363 | * Called by the request processor upon failure. |
364 | */ | |
365 | public void fail() { | |
366 | synchronized(lock) { | |
367 | fRequestFailed = true; | |
368 | done(); | |
369 | } | |
370 | } | |
371 | ||
372 | /** | |
373 | * Called by the request processor upon cancellation. | |
8c8bf09f ASL |
374 | */ |
375 | public void cancel() { | |
376 | synchronized(lock) { | |
377 | fRequestCanceled = true; | |
0ab46cd3 | 378 | done(); |
8c8bf09f ASL |
379 | } |
380 | } | |
381 | ||
cbd4ad82 FC |
382 | // ------------------------------------------------------------------------ |
383 | // Object | |
384 | // ------------------------------------------------------------------------ | |
385 | ||
386 | @Override | |
2fb2eb37 | 387 | // All requests have a unique id |
cbd4ad82 | 388 | public int hashCode() { |
2fb2eb37 | 389 | return getRequestId(); |
cbd4ad82 FC |
390 | } |
391 | ||
392 | @Override | |
393 | public boolean equals(Object other) { | |
394 | if (other instanceof TmfDataRequest<?>) { | |
395 | TmfDataRequest<?> request = (TmfDataRequest<?>) other; | |
396 | return (request.fDataType == fDataType) && | |
397 | (request.fIndex == fIndex) && | |
398 | (request.fNbRequested == fNbRequested); | |
399 | } | |
400 | return false; | |
401 | } | |
402 | ||
2fb2eb37 FC |
403 | @Override |
404 | public String toString() { | |
405 | return "[TmfDataRequest(" + fRequestId + "," + fDataType.getSimpleName() | |
f9673903 | 406 | + "," + fIndex + "," + fNbRequested + ")]"; |
2fb2eb37 | 407 | } |
8c8bf09f | 408 | } |