J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package com.sun.media.sound; |
| 27 | |
| 28 | import java.util.EventObject; |
| 29 | import java.util.ArrayList; |
| 30 | import java.util.List; |
| 31 | |
| 32 | import javax.sound.sampled.Clip; |
| 33 | import javax.sound.sampled.Line; |
| 34 | import javax.sound.sampled.LineEvent; |
| 35 | import javax.sound.sampled.LineListener; |
| 36 | |
| 37 | import javax.sound.midi.MetaMessage; |
| 38 | import javax.sound.midi.ShortMessage; |
| 39 | import javax.sound.midi.MetaEventListener; |
| 40 | import javax.sound.midi.ControllerEventListener; |
| 41 | |
| 42 | |
| 43 | |
| 44 | /** |
| 45 | * EventDispatcher. Used by various classes in the Java Sound implementation |
| 46 | * to send events. |
| 47 | * |
| 48 | * @author David Rivas |
| 49 | * @author Kara Kytle |
| 50 | * @author Florian Bomers |
| 51 | */ |
| 52 | class EventDispatcher implements Runnable { |
| 53 | |
| 54 | /** |
| 55 | * time of inactivity until the auto closing clips |
| 56 | * are closed |
| 57 | */ |
| 58 | private static final int AUTO_CLOSE_TIME = 5000; |
| 59 | |
| 60 | |
| 61 | /** |
| 62 | * List of events |
| 63 | */ |
| 64 | private ArrayList eventQueue = new ArrayList(); |
| 65 | |
| 66 | |
| 67 | /** |
| 68 | * Thread object for this EventDispatcher instance |
| 69 | */ |
| 70 | private Thread thread = null; |
| 71 | |
| 72 | |
| 73 | /* |
| 74 | * support for auto-closing Clips |
| 75 | */ |
| 76 | private ArrayList<ClipInfo> autoClosingClips = new ArrayList<ClipInfo>(); |
| 77 | |
| 78 | /* |
| 79 | * support for monitoring data lines |
| 80 | */ |
| 81 | private ArrayList<LineMonitor> lineMonitors = new ArrayList<LineMonitor>(); |
| 82 | |
| 83 | /** |
| 84 | * Approximate interval between calls to LineMonitor.checkLine |
| 85 | */ |
| 86 | static final int LINE_MONITOR_TIME = 400; |
| 87 | |
| 88 | |
| 89 | /** |
| 90 | * This start() method starts an event thread if one is not already active. |
| 91 | */ |
| 92 | synchronized void start() { |
| 93 | |
| 94 | if(thread == null) { |
| 95 | thread = JSSecurityManager.createThread(this, |
| 96 | "Java Sound Event Dispatcher", // name |
| 97 | true, // daemon |
| 98 | -1, // priority |
| 99 | true); // doStart |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | |
| 104 | /** |
| 105 | * Invoked when there is at least one event in the queue. |
| 106 | * Implement this as a callback to process one event. |
| 107 | */ |
| 108 | protected void processEvent(EventInfo eventInfo) { |
| 109 | int count = eventInfo.getListenerCount(); |
| 110 | |
| 111 | // process an LineEvent |
| 112 | if (eventInfo.getEvent() instanceof LineEvent) { |
| 113 | LineEvent event = (LineEvent) eventInfo.getEvent(); |
| 114 | if (Printer.debug) Printer.debug("Sending "+event+" to "+count+" listeners"); |
| 115 | for (int i = 0; i < count; i++) { |
| 116 | try { |
| 117 | ((LineListener) eventInfo.getListener(i)).update(event); |
| 118 | } catch (Throwable t) { |
| 119 | if (Printer.err) t.printStackTrace(); |
| 120 | } |
| 121 | } |
| 122 | return; |
| 123 | } |
| 124 | |
| 125 | // process a MetaMessage |
| 126 | if (eventInfo.getEvent() instanceof MetaMessage) { |
| 127 | MetaMessage event = (MetaMessage)eventInfo.getEvent(); |
| 128 | for (int i = 0; i < count; i++) { |
| 129 | try { |
| 130 | ((MetaEventListener) eventInfo.getListener(i)).meta(event); |
| 131 | } catch (Throwable t) { |
| 132 | if (Printer.err) t.printStackTrace(); |
| 133 | } |
| 134 | } |
| 135 | return; |
| 136 | } |
| 137 | |
| 138 | // process a Controller or Mode Event |
| 139 | if (eventInfo.getEvent() instanceof ShortMessage) { |
| 140 | ShortMessage event = (ShortMessage)eventInfo.getEvent(); |
| 141 | int status = event.getStatus(); |
| 142 | |
| 143 | // Controller and Mode events have status byte 0xBc, where |
| 144 | // c is the channel they are sent on. |
| 145 | if ((status & 0xF0) == 0xB0) { |
| 146 | for (int i = 0; i < count; i++) { |
| 147 | try { |
| 148 | ((ControllerEventListener) eventInfo.getListener(i)).controlChange(event); |
| 149 | } catch (Throwable t) { |
| 150 | if (Printer.err) t.printStackTrace(); |
| 151 | } |
| 152 | } |
| 153 | } |
| 154 | return; |
| 155 | } |
| 156 | |
| 157 | Printer.err("Unknown event type: " + eventInfo.getEvent()); |
| 158 | } |
| 159 | |
| 160 | |
| 161 | /** |
| 162 | * Wait until there is something in the event queue to process. Then |
| 163 | * dispatch the event to the listeners.The entire method does not |
| 164 | * need to be synchronized since this includes taking the event out |
| 165 | * from the queue and processing the event. We only need to provide |
| 166 | * exclusive access over the code where an event is removed from the |
| 167 | *queue. |
| 168 | */ |
| 169 | protected void dispatchEvents() { |
| 170 | |
| 171 | EventInfo eventInfo = null; |
| 172 | |
| 173 | synchronized (this) { |
| 174 | |
| 175 | // Wait till there is an event in the event queue. |
| 176 | try { |
| 177 | |
| 178 | if (eventQueue.size() == 0) { |
| 179 | if (autoClosingClips.size() > 0 || lineMonitors.size() > 0) { |
| 180 | int waitTime = AUTO_CLOSE_TIME; |
| 181 | if (lineMonitors.size() > 0) { |
| 182 | waitTime = LINE_MONITOR_TIME; |
| 183 | } |
| 184 | wait(waitTime); |
| 185 | } else { |
| 186 | wait(); |
| 187 | } |
| 188 | } |
| 189 | } catch (InterruptedException e) { |
| 190 | } |
| 191 | if (eventQueue.size() > 0) { |
| 192 | // Remove the event from the queue and dispatch it to the listeners. |
| 193 | eventInfo = (EventInfo) eventQueue.remove(0); |
| 194 | } |
| 195 | |
| 196 | } // end of synchronized |
| 197 | if (eventInfo != null) { |
| 198 | processEvent(eventInfo); |
| 199 | } else { |
| 200 | if (autoClosingClips.size() > 0) { |
| 201 | closeAutoClosingClips(); |
| 202 | } |
| 203 | if (lineMonitors.size() > 0) { |
| 204 | monitorLines(); |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | |
| 210 | /** |
| 211 | * Queue the given event in the event queue. |
| 212 | */ |
| 213 | private synchronized void postEvent(EventInfo eventInfo) { |
| 214 | eventQueue.add(eventInfo); |
| 215 | notifyAll(); |
| 216 | } |
| 217 | |
| 218 | |
| 219 | /** |
| 220 | * A loop to dispatch events. |
| 221 | */ |
| 222 | public void run() { |
| 223 | |
| 224 | while (true) { |
| 225 | try { |
| 226 | dispatchEvents(); |
| 227 | } catch (Throwable t) { |
| 228 | if (Printer.err) t.printStackTrace(); |
| 229 | } |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | |
| 234 | /** |
| 235 | * Send audio and MIDI events. |
| 236 | */ |
| 237 | void sendAudioEvents(Object event, List listeners) { |
| 238 | if ((listeners == null) |
| 239 | || (listeners.size() == 0)) { |
| 240 | // nothing to do |
| 241 | return; |
| 242 | } |
| 243 | |
| 244 | start(); |
| 245 | |
| 246 | EventInfo eventInfo = new EventInfo(event, listeners); |
| 247 | postEvent(eventInfo); |
| 248 | } |
| 249 | |
| 250 | |
| 251 | /* |
| 252 | * go through the list of registered auto-closing |
| 253 | * Clip instances and close them, if appropriate |
| 254 | * |
| 255 | * This method is called in regular intervals |
| 256 | */ |
| 257 | private void closeAutoClosingClips() { |
| 258 | synchronized(autoClosingClips) { |
| 259 | if (Printer.debug)Printer.debug("> EventDispatcher.closeAutoClosingClips ("+autoClosingClips.size()+" clips)"); |
| 260 | long currTime = System.currentTimeMillis(); |
| 261 | for (int i = autoClosingClips.size()-1; i >= 0 ; i--) { |
| 262 | ClipInfo info = autoClosingClips.get(i); |
| 263 | if (info.isExpired(currTime)) { |
| 264 | AutoClosingClip clip = info.getClip(); |
| 265 | // sanity check |
| 266 | if (!clip.isOpen() || !clip.isAutoClosing()) { |
| 267 | if (Printer.debug)Printer.debug("EventDispatcher: removing clip "+clip+" isOpen:"+clip.isOpen()); |
| 268 | autoClosingClips.remove(i); |
| 269 | } |
| 270 | else if (!clip.isRunning() && !clip.isActive() && clip.isAutoClosing()) { |
| 271 | if (Printer.debug)Printer.debug("EventDispatcher: closing clip "+clip); |
| 272 | clip.close(); |
| 273 | } else { |
| 274 | if (Printer.debug)Printer.debug("Doing nothing with clip "+clip+":"); |
| 275 | if (Printer.debug)Printer.debug(" open="+clip.isOpen()+", autoclosing="+clip.isAutoClosing()); |
| 276 | if (Printer.debug)Printer.debug(" isRunning="+clip.isRunning()+", isActive="+clip.isActive()); |
| 277 | } |
| 278 | } else { |
| 279 | if (Printer.debug)Printer.debug("EventDispatcher: clip "+info.getClip()+" not yet expired"); |
| 280 | } |
| 281 | } |
| 282 | } |
| 283 | if (Printer.debug)Printer.debug("< EventDispatcher.closeAutoClosingClips ("+autoClosingClips.size()+" clips)"); |
| 284 | } |
| 285 | |
| 286 | private int getAutoClosingClipIndex(AutoClosingClip clip) { |
| 287 | synchronized(autoClosingClips) { |
| 288 | for (int i = autoClosingClips.size()-1; i >= 0; i--) { |
| 289 | if (clip.equals(autoClosingClips.get(i).getClip())) { |
| 290 | return i; |
| 291 | } |
| 292 | } |
| 293 | } |
| 294 | return -1; |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * called from auto-closing clips when one of their open() method is called |
| 299 | */ |
| 300 | void autoClosingClipOpened(AutoClosingClip clip) { |
| 301 | if (Printer.debug)Printer.debug("> EventDispatcher.autoClosingClipOpened "); |
| 302 | int index = 0; |
| 303 | synchronized(autoClosingClips) { |
| 304 | index = getAutoClosingClipIndex(clip); |
| 305 | if (index == -1) { |
| 306 | if (Printer.debug)Printer.debug("EventDispatcher: adding auto-closing clip "+clip); |
| 307 | autoClosingClips.add(new ClipInfo(clip)); |
| 308 | } |
| 309 | } |
| 310 | if (index == -1) { |
| 311 | synchronized (this) { |
| 312 | // this is only for the case that the first clip is set to autoclosing, |
| 313 | // and it is already open, and nothing is done with it. |
| 314 | // EventDispatcher.process() method would block in wait() and |
| 315 | // never close this first clip, keeping the device open. |
| 316 | notifyAll(); |
| 317 | } |
| 318 | } |
| 319 | if (Printer.debug)Printer.debug("< EventDispatcher.autoClosingClipOpened finished("+autoClosingClips.size()+" clips)"); |
| 320 | } |
| 321 | |
| 322 | /** |
| 323 | * called from auto-closing clips when their closed() method is called |
| 324 | */ |
| 325 | void autoClosingClipClosed(AutoClosingClip clip) { |
| 326 | // nothing to do -- is removed from arraylist above |
| 327 | } |
| 328 | |
| 329 | |
| 330 | // ////////////////////////// Line Monitoring Support /////////////////// // |
| 331 | /* |
| 332 | * go through the list of registered line monitors |
| 333 | * and call their checkLine method |
| 334 | * |
| 335 | * This method is called in regular intervals |
| 336 | */ |
| 337 | private void monitorLines() { |
| 338 | synchronized(lineMonitors) { |
| 339 | if (Printer.debug)Printer.debug("> EventDispatcher.monitorLines ("+lineMonitors.size()+" monitors)"); |
| 340 | for (int i = 0; i < lineMonitors.size(); i++) { |
| 341 | lineMonitors.get(i).checkLine(); |
| 342 | } |
| 343 | } |
| 344 | if (Printer.debug)Printer.debug("< EventDispatcher.monitorLines("+lineMonitors.size()+" monitors)"); |
| 345 | } |
| 346 | |
| 347 | |
| 348 | /** |
| 349 | * Add this LineMonitor instance to the list of monitors |
| 350 | */ |
| 351 | void addLineMonitor(LineMonitor lm) { |
| 352 | if (Printer.trace)Printer.trace("> EventDispatcher.addLineMonitor("+lm+")"); |
| 353 | synchronized(lineMonitors) { |
| 354 | if (lineMonitors.indexOf(lm) >= 0) { |
| 355 | if (Printer.trace)Printer.trace("< EventDispatcher.addLineMonitor finished -- this monitor already exists!"); |
| 356 | return; |
| 357 | } |
| 358 | if (Printer.debug)Printer.debug("EventDispatcher: adding line monitor "+lm); |
| 359 | lineMonitors.add(lm); |
| 360 | } |
| 361 | synchronized (this) { |
| 362 | // need to interrupt the infinite wait() |
| 363 | notifyAll(); |
| 364 | } |
| 365 | if (Printer.debug)Printer.debug("< EventDispatcher.addLineMonitor finished -- now ("+lineMonitors.size()+" monitors)"); |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * Remove this LineMonitor instance from the list of monitors |
| 370 | */ |
| 371 | void removeLineMonitor(LineMonitor lm) { |
| 372 | if (Printer.trace)Printer.trace("> EventDispatcher.removeLineMonitor("+lm+")"); |
| 373 | synchronized(lineMonitors) { |
| 374 | if (lineMonitors.indexOf(lm) < 0) { |
| 375 | if (Printer.trace)Printer.trace("< EventDispatcher.removeLineMonitor finished -- this monitor does not exist!"); |
| 376 | return; |
| 377 | } |
| 378 | if (Printer.debug)Printer.debug("EventDispatcher: removing line monitor "+lm); |
| 379 | lineMonitors.remove(lm); |
| 380 | } |
| 381 | if (Printer.debug)Printer.debug("< EventDispatcher.removeLineMonitor finished -- now ("+lineMonitors.size()+" monitors)"); |
| 382 | } |
| 383 | |
| 384 | // /////////////////////////////////// INNER CLASSES ////////////////////////////////////////// // |
| 385 | |
| 386 | /** |
| 387 | * Container for an event and a set of listeners to deliver it to. |
| 388 | */ |
| 389 | private class EventInfo { |
| 390 | |
| 391 | private Object event; |
| 392 | private Object[] listeners; |
| 393 | |
| 394 | /** |
| 395 | * Create a new instance of this event Info class |
| 396 | * @param event the event to be dispatched |
| 397 | * @param listeners listener list; will be copied |
| 398 | */ |
| 399 | EventInfo(Object event, List listeners) { |
| 400 | this.event = event; |
| 401 | this.listeners = listeners.toArray(); |
| 402 | } |
| 403 | |
| 404 | Object getEvent() { |
| 405 | return event; |
| 406 | } |
| 407 | |
| 408 | int getListenerCount() { |
| 409 | return listeners.length; |
| 410 | } |
| 411 | |
| 412 | Object getListener(int index) { |
| 413 | return listeners[index]; |
| 414 | } |
| 415 | |
| 416 | } // class EventInfo |
| 417 | |
| 418 | |
| 419 | /** |
| 420 | * Container for a clip with its expiration time |
| 421 | */ |
| 422 | private class ClipInfo { |
| 423 | |
| 424 | private AutoClosingClip clip; |
| 425 | private long expiration; |
| 426 | |
| 427 | /** |
| 428 | * Create a new instance of this clip Info class |
| 429 | */ |
| 430 | ClipInfo(AutoClosingClip clip) { |
| 431 | this.clip = clip; |
| 432 | this.expiration = System.currentTimeMillis() + AUTO_CLOSE_TIME; |
| 433 | } |
| 434 | |
| 435 | AutoClosingClip getClip() { |
| 436 | return clip; |
| 437 | } |
| 438 | |
| 439 | boolean isExpired(long currTime) { |
| 440 | return currTime > expiration; |
| 441 | } |
| 442 | } // class ClipInfo |
| 443 | |
| 444 | |
| 445 | /** |
| 446 | * Interface that a class that wants to get regular |
| 447 | * line monitor events implements |
| 448 | */ |
| 449 | interface LineMonitor { |
| 450 | /** |
| 451 | * Called by event dispatcher in regular intervals |
| 452 | */ |
| 453 | public void checkLine(); |
| 454 | } |
| 455 | |
| 456 | } // class EventDispatcher |