Mercurial > projects > dwt-addons
annotate dwtx/jface/operation/ModalContext.d @ 167:862b05e0334a
Add a wrapper for Thread
| author | Frank Benoit <benoit@tionex.de> |
|---|---|
| date | Tue, 09 Sep 2008 15:59:16 +0200 |
| parents | 7ffeace6c47f |
| children |
| rev | line source |
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| 6 | 1 /******************************************************************************* |
| 90 | 2 * Copyright (c) 2000, 2008 IBM Corporation and others. |
| 6 | 3 * All rights reserved. This program and the accompanying materials |
| 4 * are made available under the terms of the Eclipse Public License v1.0 | |
| 5 * which accompanies this distribution, and is available at | |
| 6 * http://www.eclipse.org/legal/epl-v10.html | |
| 7 * | |
| 8 * Contributors: | |
| 9 * IBM Corporation - initial API and implementation | |
| 10 * Port to the D programming language: | |
| 11 * Frank Benoit <benoit@tionex.de> | |
| 12 *******************************************************************************/ | |
| 13 module dwtx.jface.operation.ModalContext; | |
| 14 | |
| 15 import dwt.widgets.Display; | |
| 16 import dwtx.core.runtime.Assert; | |
| 17 import dwtx.core.runtime.IProgressMonitor; | |
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18 import dwtx.core.runtime.IStatus; |
| 6 | 19 import dwtx.core.runtime.OperationCanceledException; |
| 20 import dwtx.core.runtime.ProgressMonitorWrapper; | |
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21 import dwtx.core.runtime.Status; |
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22 import dwtx.jface.util.Policy; |
| 6 | 23 |
| 24 import dwtx.jface.operation.IThreadListener; | |
| 25 import dwtx.jface.operation.IRunnableWithProgress; | |
| 26 import dwtx.jface.operation.AccumulatingProgressMonitor; | |
| 27 | |
| 28 import dwt.dwthelper.utils; | |
| 29 import dwt.dwthelper.Runnable; | |
| 167 | 30 import dwtx.dwtxhelper.JThread; |
| 6 | 31 import tango.io.Stdout; |
| 32 | |
| 33 /** | |
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34 * Utility class for supporting modal operations. The runnable passed to the |
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35 * <code>run</code> method is executed in a separate thread, depending on the |
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36 * value of the passed fork argument. If the runnable is executed in a separate |
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37 * thread then the current thread either waits until the new thread ends or, if |
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38 * the current thread is the UI thread, it polls the DWT event queue and |
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39 * dispatches each event. |
| 6 | 40 * <p> |
| 41 * This class is not intended to be subclassed. | |
| 42 * </p> | |
| 90 | 43 * @noinstantiate This class is not intended to be instantiated by clients. |
| 44 * @noextend This class is not intended to be subclassed by clients. | |
| 6 | 45 */ |
| 46 public class ModalContext { | |
| 47 | |
| 48 /** | |
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49 * Indicated whether ModalContext is in debug mode; <code>false</code> by |
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50 * default. |
| 6 | 51 */ |
| 65 | 52 private static bool debug_ = true; |
| 6 | 53 |
| 54 /** | |
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55 * The number of nested modal runs, or 0 if not inside a modal run. This is |
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56 * global state. |
| 6 | 57 */ |
| 58 private static int modalLevel = 0; | |
| 59 | |
| 60 /** | |
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61 * Indicates whether operations should be run in a separate thread. Defaults |
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62 * to true. For internal debugging use, set to false to run operations in |
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63 * the calling thread. |
| 6 | 64 */ |
| 65 private static bool runInSeparateThread = true; | |
| 66 | |
| 67 /** | |
| 68 * Thread which runs the modal context. | |
| 69 */ | |
| 167 | 70 private static class ModalContextThread : JThread { |
| 6 | 71 /** |
| 72 * The operation to be run. | |
| 73 */ | |
| 74 private IRunnableWithProgress runnable; | |
| 75 | |
| 76 /** | |
| 77 * The exception thrown by the operation starter. | |
| 78 */ | |
| 79 private Exception throwable; | |
| 80 | |
| 81 /** | |
| 82 * The progress monitor used for progress and cancelation. | |
| 83 */ | |
| 84 private IProgressMonitor progressMonitor; | |
| 85 | |
| 86 /** | |
| 87 * The display used for event dispatching. | |
| 88 */ | |
| 89 private Display display; | |
| 90 | |
| 91 /** | |
| 92 * Indicates whether to continue event queue dispatching. | |
| 93 */ | |
| 94 private /+volatile+/ bool continueEventDispatching = true; | |
| 95 | |
| 96 /** | |
| 97 * The thread that forked this modal context thread. | |
| 98 * | |
| 99 * @since 3.1 | |
| 100 */ | |
| 167 | 101 private JThread callingThread; |
| 6 | 102 |
| 103 /** | |
| 104 * Creates a new modal context. | |
| 105 * | |
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106 * @param operation |
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107 * the runnable to run |
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108 * @param monitor |
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109 * the progress monitor to use to display progress and |
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110 * receive requests for cancelation |
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111 * @param display |
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112 * the display to be used to read and dispatch events |
| 6 | 113 */ |
| 114 private this(IRunnableWithProgress operation, | |
| 115 IProgressMonitor monitor, Display display) { | |
| 167 | 116 super(); //$NON-NLS-1$ |
| 6 | 117 Assert.isTrue(monitor !is null && display !is null); |
| 118 runnable = operation; | |
| 119 progressMonitor = new AccumulatingProgressMonitor(monitor, display); | |
| 120 this.display = display; | |
| 167 | 121 this.callingThread = JThread.currentThread(); |
| 6 | 122 } |
| 123 | |
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124 /* |
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125 * (non-Javadoc) Method declared on Thread. |
| 6 | 126 */ |
| 167 | 127 public override void run() { |
| 6 | 128 try { |
| 129 if (runnable !is null) { | |
| 130 runnable.run(progressMonitor); | |
| 131 } | |
| 132 /+ | |
| 133 } catch (InvocationTargetException e) { | |
| 134 throwable = e; | |
| 135 } catch (InterruptedException e) { | |
| 136 throwable = e; | |
| 137 } catch (RuntimeException e) { | |
| 138 throwable = e; | |
| 139 } catch (ThreadDeath e) { | |
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140 // Make sure to propagate ThreadDeath, or threads will never |
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141 // fully terminate |
| 6 | 142 throw e; |
| 143 +/ | |
| 144 } catch (/+Error+/Exception e) { | |
| 145 throwable = e; | |
| 146 } finally { | |
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147 // notify the operation of change of thread of control |
| 6 | 148 if ( auto tl = cast(IThreadListener)runnable ) { |
| 71 | 149 auto exception = |
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150 invokeThreadListener(tl, callingThread); |
| 71 | 151 |
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152 //Forward it if we don't already have one |
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153 if(exception !is null && throwable is null) |
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154 throwable = exception; |
| 6 | 155 } |
| 156 | |
| 157 // Make sure that all events in the asynchronous event queue | |
| 158 // are dispatched. | |
| 167 | 159 display.syncExec(dgRunnable( { |
| 160 // do nothing | |
| 161 } )); | |
| 6 | 162 |
| 163 // Stop event dispatching | |
| 164 continueEventDispatching = false; | |
| 165 | |
| 166 // Force the event loop to return from sleep () so that | |
| 167 // it stops event dispatching. | |
| 168 display.asyncExec(null); | |
| 169 } | |
| 170 } | |
| 171 | |
| 172 /** | |
| 173 * Processes events or waits until this modal context thread terminates. | |
| 174 */ | |
| 175 public void block() { | |
| 176 if (display is Display.getCurrent()) { | |
| 177 while (continueEventDispatching) { | |
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178 // Run the event loop. Handle any uncaught exceptions caused |
| 6 | 179 // by UI events. |
| 180 try { | |
| 181 if (!display.readAndDispatch()) { | |
| 182 display.sleep(); | |
| 183 } | |
| 184 } | |
| 185 /+ | |
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186 // ThreadDeath is a normal error when the thread is dying. |
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187 // We must |
| 6 | 188 // propagate it in order for it to properly terminate. |
| 189 catch (ThreadDeath e) { | |
| 190 throw (e); | |
| 191 } | |
| 192 +/ | |
| 193 // For all other exceptions, log the problem. | |
| 194 catch (Exception e) { | |
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195 Policy |
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196 .getLog() |
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197 .log( |
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198 new Status( |
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199 IStatus.ERROR, |
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200 Policy.JFACE, |
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201 "Unhandled event loop exception during blocked modal context.",//$NON-NLS-1$ |
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202 e)); |
| 6 | 203 } |
| 204 } | |
| 205 } else { | |
| 206 try { | |
| 207 join(); | |
| 208 } catch (Exception e) { | |
| 209 throwable = e; | |
| 210 } | |
| 211 } | |
| 212 } | |
| 213 } | |
| 214 | |
| 215 /** | |
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216 * Returns whether the first progress monitor is the same as, or a wrapper |
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217 * around, the second progress monitor. |
| 71 | 218 * |
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219 * @param monitor1 |
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220 * the first progress monitor |
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221 * @param monitor2 |
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222 * the second progress monitor |
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223 * @return <code>true</code> if the first is the same as, or a wrapper |
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224 * around, the second |
| 6 | 225 * @see ProgressMonitorWrapper |
| 226 */ | |
| 227 public static bool canProgressMonitorBeUsed(IProgressMonitor monitor1, | |
| 228 IProgressMonitor monitor2) { | |
| 229 if (monitor1 is monitor2) { | |
| 230 return true; | |
| 231 } | |
| 232 | |
| 233 while ( cast(ProgressMonitorWrapper)monitor1 ) { | |
| 234 monitor1 = (cast(ProgressMonitorWrapper)monitor1) | |
| 235 .getWrappedProgressMonitor(); | |
| 236 if (monitor1 is monitor2) { | |
| 237 return true; | |
| 238 } | |
| 239 } | |
| 240 return false; | |
| 241 } | |
| 242 | |
| 243 /** | |
| 244 * Checks with the given progress monitor and throws | |
| 245 * <code>InterruptedException</code> if it has been canceled. | |
| 246 * <p> | |
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247 * Code in a long-running operation should call this method regularly so |
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248 * that a request to cancel will be honored. |
| 6 | 249 * </p> |
| 250 * <p> | |
| 251 * Convenience for: | |
| 71 | 252 * |
| 6 | 253 * <pre> |
| 254 * if (monitor.isCanceled()) | |
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255 * throw new InterruptedException(); |
| 6 | 256 * </pre> |
| 71 | 257 * |
| 6 | 258 * </p> |
| 71 | 259 * |
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260 * @param monitor |
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261 * the progress monitor |
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262 * @exception InterruptedException |
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263 * if cancelling the operation has been requested |
| 6 | 264 * @see IProgressMonitor#isCanceled() |
| 265 */ | |
| 266 public static void checkCanceled(IProgressMonitor monitor) { | |
| 267 if (monitor.isCanceled()) { | |
| 268 throw new InterruptedException(); | |
| 269 } | |
| 270 } | |
| 271 | |
| 272 /** | |
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273 * Returns the currently active modal context thread, or null if no modal |
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274 * context is active. |
| 6 | 275 */ |
| 276 private static ModalContextThread getCurrentModalContextThread() { | |
| 167 | 277 JThread t = JThread.currentThread(); |
| 6 | 278 if ( auto r = cast(ModalContextThread)t ) { |
| 279 return r; | |
| 280 } | |
| 281 return null; | |
| 282 } | |
| 283 | |
| 284 /** | |
| 285 * Returns the modal nesting level. | |
| 286 * <p> | |
| 287 * The modal nesting level increases by one each time the | |
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288 * <code>ModalContext.run</code> method is called within the dynamic scope |
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289 * of another call to <code>ModalContext.run</code>. |
| 6 | 290 * </p> |
| 71 | 291 * |
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292 * @return the modal nesting level, or <code>0</code> if this method is |
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293 * called outside the dynamic scope of any invocation of |
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294 * <code>ModalContext.run</code> |
| 6 | 295 */ |
| 296 public static int getModalLevel() { | |
| 297 return modalLevel; | |
| 298 } | |
| 299 | |
| 300 /** | |
| 301 * Returns whether the given thread is running a modal context. | |
| 302 * | |
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303 * @param thread |
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304 * The thread to be checked |
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305 * @return <code>true</code> if the given thread is running a modal |
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306 * context, <code>false</code> if not |
| 6 | 307 */ |
| 167 | 308 public static bool isModalContextThread(JThread thread) { |
| 6 | 309 return (cast(ModalContextThread)thread) !is null; |
| 310 } | |
| 311 | |
| 312 /** | |
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313 * Runs the given runnable in a modal context, passing it a progress |
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314 * monitor. |
| 6 | 315 * <p> |
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316 * The modal nesting level is increased by one from the perspective of the |
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317 * given runnable. |
| 6 | 318 * </p> |
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319 * <p> |
| 6 | 320 * If the supplied operation implements <code>IThreadListener</code>, it |
| 321 * will be notified of any thread changes required to execute the operation. | |
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322 * Specifically, the operation will be notified of the thread that will call |
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323 * its <code>run</code> method before it is called, and will be notified |
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324 * of the change of control back to the thread calling this method when the |
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325 * operation completes. These thread change notifications give the operation |
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326 * an opportunity to transfer any thread-local state to the execution thread |
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327 * before control is transferred to the new thread. |
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328 * </p> |
| 71 | 329 * |
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330 * @param operation |
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331 * the runnable to run |
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332 * @param fork |
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333 * <code>true</code> if the runnable should run in a separate |
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334 * thread, and <code>false</code> if in the same thread |
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335 * @param monitor |
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336 * the progress monitor to use to display progress and receive |
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337 * requests for cancelation |
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338 * @param display |
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339 * the display to be used to read and dispatch events |
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340 * @exception InvocationTargetException |
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341 * if the run method must propagate a checked exception, it |
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342 * should wrap it inside an |
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343 * <code>InvocationTargetException</code>; runtime |
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344 * exceptions and errors are automatically wrapped in an |
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345 * <code>InvocationTargetException</code> by this method |
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346 * @exception InterruptedException |
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347 * if the operation detects a request to cancel, using |
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348 * <code>IProgressMonitor.isCanceled()</code>, it should |
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349 * exit by throwing <code>InterruptedException</code>; |
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350 * this method propagates the exception |
| 6 | 351 */ |
| 352 public static void run(IRunnableWithProgress operation, bool fork, | |
| 353 IProgressMonitor monitor, Display display) { | |
| 354 Assert.isTrue(operation !is null && monitor !is null); | |
| 355 | |
| 356 modalLevel++; | |
| 357 try { | |
| 358 if (monitor !is null) { | |
| 359 monitor.setCanceled(false); | |
| 360 } | |
| 361 // Is the runnable supposed to be execute in the same thread. | |
| 362 if (!fork || !runInSeparateThread) { | |
| 363 runInCurrentThread(operation, monitor); | |
| 364 } else { | |
| 365 ModalContextThread t = getCurrentModalContextThread(); | |
| 366 if (t !is null) { | |
| 367 Assert.isTrue(canProgressMonitorBeUsed(monitor, | |
| 368 t.progressMonitor)); | |
| 369 runInCurrentThread(operation, monitor); | |
| 370 } else { | |
| 371 t = new ModalContextThread(operation, monitor, display); | |
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372 Exception listenerException = null; |
| 6 | 373 if ( auto tl = cast(IThreadListener)operation ) { |
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374 listenerException = invokeThreadListener(tl, t); |
| 6 | 375 } |
| 71 | 376 |
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377 if(listenerException is null){ |
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378 t.start(); |
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379 t.block(); |
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380 } |
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381 else { |
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382 if(t.throwable is null) |
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383 t.throwable = listenerException; |
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384 } |
| 6 | 385 Exception throwable = t.throwable; |
| 386 if (throwable !is null) { | |
| 387 if (debug_ | |
| 388 && !(cast(InterruptedException)throwable ) | |
| 389 && !(cast(OperationCanceledException)throwable )) { | |
| 390 Stderr.formatln("Exception in modal context operation:"); //$NON-NLS-1$ | |
| 391 ExceptionPrintStackTrace(throwable); | |
| 392 Stderr.formatln("Called from:"); //$NON-NLS-1$ | |
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393 // Don't create the InvocationTargetException on the |
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394 // throwable, |
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395 // otherwise it will print its stack trace (from the |
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396 // other thread). |
| 6 | 397 ExceptionPrintStackTrace( new InvocationTargetException(null)); |
| 398 } | |
| 399 if (cast(InvocationTargetException)throwable ) { | |
| 400 throw cast(InvocationTargetException) throwable; | |
| 401 } else if (cast(InterruptedException)throwable ) { | |
| 402 throw cast(InterruptedException) throwable; | |
| 403 } else if (cast(OperationCanceledException)throwable ) { | |
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404 // See 1GAN3L5: ITPUI:WIN2000 - ModalContext |
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405 // converts OperationCancelException into |
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406 // InvocationTargetException |
| 6 | 407 throw new InterruptedException(throwable |
| 408 .msg); | |
| 409 } else { | |
| 410 throw new InvocationTargetException(throwable); | |
| 411 } | |
| 412 } | |
| 413 } | |
| 414 } | |
| 415 } finally { | |
| 416 modalLevel--; | |
| 417 } | |
| 418 } | |
| 419 | |
| 420 /** | |
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421 * Invoke the ThreadListener if there are any errors or RuntimeExceptions |
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422 * return them. |
| 71 | 423 * |
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424 * @param listener |
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425 * @param switchingThread |
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426 * the {@link Thread} being switched to |
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427 */ |
| 71 | 428 static Exception invokeThreadListener(IThreadListener listener, |
| 167 | 429 JThread switchingThread) { |
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430 try { |
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431 listener.threadChange(switchingThread); |
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432 // } catch (ThreadDeath e) { |
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433 // Make sure to propagate ThreadDeath, or threads will never |
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434 // fully terminate |
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435 // throw e; |
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436 // } catch (Error e) { |
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437 // return e; |
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438 }catch (RuntimeException e) { |
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439 return e; |
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440 } |
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441 return null; |
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442 } |
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443 |
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444 /** |
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445 * Run a runnable. Convert all thrown exceptions to either |
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446 * InterruptedException or InvocationTargetException |
| 6 | 447 */ |
| 448 private static void runInCurrentThread(IRunnableWithProgress runnable, | |
| 449 IProgressMonitor progressMonitor) { | |
| 450 try { | |
| 451 if (runnable !is null) { | |
| 452 runnable.run(progressMonitor); | |
| 453 } | |
| 454 } catch (InvocationTargetException e) { | |
| 455 throw e; | |
| 456 } catch (InterruptedException e) { | |
| 457 throw e; | |
| 458 } catch (OperationCanceledException e) { | |
| 459 throw new InterruptedException(); | |
| 460 /+ | |
| 461 } catch (ThreadDeath e) { | |
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462 // Make sure to propagate ThreadDeath, or threads will never fully |
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463 // terminate |
| 6 | 464 throw e; |
| 465 +/ | |
| 466 } catch (RuntimeException e) { | |
| 467 throw new InvocationTargetException(e); | |
| 468 } catch (/+Error+/Exception e) { | |
| 469 throw new InvocationTargetException(e); | |
| 470 } | |
| 471 } | |
| 472 | |
| 473 /** | |
| 474 * Sets whether ModalContext is running in debug mode. | |
| 71 | 475 * |
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476 * @param debugMode |
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477 * <code>true</code> for debug mode, and <code>false</code> |
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478 * for normal mode (the default) |
| 6 | 479 */ |
| 480 public static void setDebugMode(bool debugMode) { | |
| 481 debug_ = debugMode; | |
| 482 } | |
| 483 | |
| 484 /** | |
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485 * Sets whether ModalContext may process events (by calling |
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486 * <code>Display.readAndDispatch()</code>) while running operations. By |
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487 * default, ModalContext will process events while running operations. Use |
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488 * this method to disallow event processing temporarily. |
| 71 | 489 * |
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490 * @param allowReadAndDispatch |
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491 * <code>true</code> (the default) if events may be processed |
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492 * while running an operation, <code>false</code> if |
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493 * Display.readAndDispatch() should not be called from |
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494 * ModalContext. |
| 6 | 495 * @since 3.2 |
| 496 */ | |
| 497 public static void setAllowReadAndDispatch(bool allowReadAndDispatch) { | |
| 498 // use a separate thread if and only if it is OK to spin the event loop | |
| 499 runInSeparateThread = allowReadAndDispatch; | |
| 500 } | |
| 501 } |