| 1 | /* |
| 2 | * jDTAUS Core RI JDK 1.4 Executor |
| 3 | * Copyright (C) 2005 Christian Schulte |
| 4 | * <cs@schulte.it> |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | * |
| 20 | */ |
| 21 | package org.jdtaus.core.lang.ri.executor; |
| 22 | |
| 23 | import java.util.ArrayList; |
| 24 | import java.util.List; |
| 25 | import javax.swing.event.EventListenerList; |
| 26 | import org.jdtaus.core.container.ContainerFactory; |
| 27 | import org.jdtaus.core.lang.ExceptionEvent; |
| 28 | import org.jdtaus.core.lang.ExceptionListener; |
| 29 | import org.jdtaus.core.lang.spi.Executor; |
| 30 | |
| 31 | /** |
| 32 | * jDTAUS Core SPI JDK 1.4 {@code Executor} reference implementation. |
| 33 | * |
| 34 | * @author <a href="mailto:cs@schulte.it">Christian Schulte</a> |
| 35 | * @version $JDTAUS: Jdk14Executor.java 8641 2012-09-27 06:45:17Z schulte $ |
| 36 | * |
| 37 | * @see org.jdtaus.core.container.Container |
| 38 | */ |
| 39 | public class Jdk14Executor implements Executor |
| 40 | { |
| 41 | //--Constructors------------------------------------------------------------ |
| 42 | |
| 43 | // <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:jdtausConstructors |
| 44 | // This section is managed by jdtaus-container-mojo. |
| 45 | |
| 46 | /** Standard implementation constructor <code>org.jdtaus.core.lang.ri.executor.Jdk14Executor</code>. */ |
| 47 | public Jdk14Executor() |
| 48 | { |
| 49 | super(); |
| 50 | } |
| 51 | |
| 52 | // </editor-fold>//GEN-END:jdtausConstructors |
| 53 | |
| 54 | //------------------------------------------------------------Constructors-- |
| 55 | //--Properties-------------------------------------------------------------- |
| 56 | |
| 57 | // <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:jdtausProperties |
| 58 | // This section is managed by jdtaus-container-mojo. |
| 59 | |
| 60 | /** |
| 61 | * Gets the value of property <code>defaultThreadGroupName</code>. |
| 62 | * |
| 63 | * @return Default name of the thread group backing the implementation. |
| 64 | */ |
| 65 | private java.lang.String getDefaultThreadGroupName() |
| 66 | { |
| 67 | return (java.lang.String) ContainerFactory.getContainer(). |
| 68 | getProperty( this, "defaultThreadGroupName" ); |
| 69 | |
| 70 | } |
| 71 | |
| 72 | // </editor-fold>//GEN-END:jdtausProperties |
| 73 | |
| 74 | //--------------------------------------------------------------Properties-- |
| 75 | //--ExceptionEventSource---------------------------------------------------- |
| 76 | |
| 77 | /** Holds {@code ExceptionListener}s. */ |
| 78 | private final EventListenerList listeners = new EventListenerList(); |
| 79 | |
| 80 | public void addExceptionListener( final ExceptionListener listener ) |
| 81 | { |
| 82 | if ( listener == null ) |
| 83 | { |
| 84 | throw new NullPointerException( "listener" ); |
| 85 | } |
| 86 | |
| 87 | synchronized ( this.listeners ) |
| 88 | { |
| 89 | this.listeners.add( ExceptionListener.class, listener ); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | public void removeExceptionListener( final ExceptionListener listener ) |
| 94 | { |
| 95 | if ( listener == null ) |
| 96 | { |
| 97 | throw new NullPointerException( "listener" ); |
| 98 | } |
| 99 | |
| 100 | synchronized ( this.listeners ) |
| 101 | { |
| 102 | this.listeners.remove( ExceptionListener.class, listener ); |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | public ExceptionListener[] getExceptionListeners() |
| 107 | { |
| 108 | synchronized ( this.listeners ) |
| 109 | { |
| 110 | return (ExceptionListener[]) this.listeners.getListeners( |
| 111 | ExceptionListener.class ); |
| 112 | |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | //----------------------------------------------------ExceptionEventSource-- |
| 117 | //--ExceptionHandler-------------------------------------------------------- |
| 118 | |
| 119 | /** List of exception handled by the instance. */ |
| 120 | private final List handledExceptions = new ArrayList( 255 ); |
| 121 | |
| 122 | public ExceptionEvent[] getExceptionEvents() |
| 123 | { |
| 124 | synchronized ( this.handledExceptions ) |
| 125 | { |
| 126 | return (ExceptionEvent[]) this.handledExceptions.toArray( |
| 127 | new ExceptionEvent[ this.handledExceptions.size() ] ); |
| 128 | |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | public void handle( final Throwable t ) |
| 133 | { |
| 134 | if ( t == null ) |
| 135 | { |
| 136 | throw new NullPointerException( "t" ); |
| 137 | } |
| 138 | |
| 139 | final ExceptionEvent evt = |
| 140 | new ExceptionEvent( this, Thread.currentThread(), t ); |
| 141 | |
| 142 | this.fireOnException( evt ); |
| 143 | } |
| 144 | |
| 145 | //--------------------------------------------------------ExceptionHandler-- |
| 146 | //--Executor---------------------------------------------------------------- |
| 147 | |
| 148 | public void executeAsynchronously( final Runnable runnable ) |
| 149 | { |
| 150 | if ( runnable == null ) |
| 151 | { |
| 152 | throw new NullPointerException( "runnable" ); |
| 153 | } |
| 154 | |
| 155 | new Thread( this.getThreadGroup(), runnable ).start(); |
| 156 | } |
| 157 | |
| 158 | //----------------------------------------------------------------Executor-- |
| 159 | //--Jdk14Executor----------------------------------------------------------- |
| 160 | |
| 161 | /** The name of the thread group backing the instance. */ |
| 162 | private String threadGroupName; |
| 163 | |
| 164 | /** |
| 165 | * {@code ThreadGroup} of threads executing the given {@code Runnable}s |
| 166 | * asynchronously. |
| 167 | */ |
| 168 | private ThreadGroup threadGroup; |
| 169 | |
| 170 | /** |
| 171 | * Creates a new {@code Jdk14Executor} instance taking the name of the |
| 172 | * thread group backing the instance. |
| 173 | * |
| 174 | * @param threadGroupName the name of the thread group backing the instance. |
| 175 | */ |
| 176 | public Jdk14Executor( final String threadGroupName ) |
| 177 | { |
| 178 | if ( threadGroupName != null ) |
| 179 | { |
| 180 | this.threadGroupName = threadGroupName; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Group of threads executing the given {@code Runnable}s asynchronously. |
| 186 | */ |
| 187 | private final class ThreadGroup extends java.lang.ThreadGroup |
| 188 | { |
| 189 | |
| 190 | /** |
| 191 | * Creates a new {@code ExecutorThreadGroup} instance taking its name. |
| 192 | * |
| 193 | * @param name the name of the new thread group. |
| 194 | */ |
| 195 | ThreadGroup( final String name ) |
| 196 | { |
| 197 | super( name ); |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * {@inheritdDoc} |
| 202 | * <p>This method notifies any registered {@code ExceptionListener}s |
| 203 | * about the given exception if it is not an instance of |
| 204 | * {@code ThreadDeath}. For instances of {@code ThreadDeath} the super |
| 205 | * classe's {@code uncaughtException(Thread, Throwable)} method is |
| 206 | * called.</p> |
| 207 | * |
| 208 | * @param t the thread that is about to exit. |
| 209 | * @param e the uncaught exception. |
| 210 | */ |
| 211 | public void uncaughtException( final Thread t, final Throwable e ) |
| 212 | { |
| 213 | if ( e instanceof ThreadDeath ) |
| 214 | { |
| 215 | super.uncaughtException( t, e ); |
| 216 | } |
| 217 | else |
| 218 | { |
| 219 | fireOnException( |
| 220 | new ExceptionEvent( Jdk14Executor.this, t, e ) ); |
| 221 | |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Gets the value of property {@code threadGroupName}. |
| 229 | * |
| 230 | * @return the name of the thread group backing the instance. |
| 231 | */ |
| 232 | private String getThreadGroupName() |
| 233 | { |
| 234 | if ( this.threadGroupName == null ) |
| 235 | { |
| 236 | this.threadGroupName = this.getDefaultThreadGroupName(); |
| 237 | } |
| 238 | |
| 239 | return this.threadGroupName; |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * Gets the group of threads executing the given {@code Runnable}s |
| 244 | * asynchronously. |
| 245 | * |
| 246 | * @return the group of threads executing the given {@code Runnable}s |
| 247 | * asynchronously. |
| 248 | */ |
| 249 | private ThreadGroup getThreadGroup() |
| 250 | { |
| 251 | if ( this.threadGroup == null ) |
| 252 | { |
| 253 | this.threadGroup = |
| 254 | new Jdk14Executor.ThreadGroup( this.getThreadGroupName() ); |
| 255 | |
| 256 | } |
| 257 | |
| 258 | return this.threadGroup; |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * Notifies all registered {@code ExceptionListener}s about a given |
| 263 | * {@code ExceptionEvent}. |
| 264 | * |
| 265 | * @param e the event to provide to the listeners. |
| 266 | * |
| 267 | * @throws NullPointerException if {@code e} is {@code null}. |
| 268 | */ |
| 269 | private void fireOnException( final ExceptionEvent e ) |
| 270 | { |
| 271 | if ( e == null ) |
| 272 | { |
| 273 | throw new NullPointerException( "e" ); |
| 274 | } |
| 275 | |
| 276 | synchronized ( this.handledExceptions ) |
| 277 | { |
| 278 | this.handledExceptions.add( e ); |
| 279 | } |
| 280 | |
| 281 | synchronized ( this.listeners ) |
| 282 | { |
| 283 | final Object[] list = this.listeners.getListenerList(); |
| 284 | for ( int i = list.length - 2; i >= 0; i -= 2 ) |
| 285 | { |
| 286 | if ( list[i] == ExceptionListener.class ) |
| 287 | { |
| 288 | ( (ExceptionListener) list[i + 1] ).onException( e ); |
| 289 | } |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | final ExceptionListener[] exceptionListener = |
| 294 | this.getExceptionListener(); |
| 295 | |
| 296 | for ( int i = exceptionListener.length - 1; i >= 0; i-- ) |
| 297 | { |
| 298 | exceptionListener[i].onException( e ); |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | //-----------------------------------------------------------Jdk14Executor-- |
| 303 | //--Dependencies------------------------------------------------------------ |
| 304 | |
| 305 | // <editor-fold defaultstate="collapsed" desc=" Generated Code ">//GEN-BEGIN:jdtausDependencies |
| 306 | // This section is managed by jdtaus-container-mojo. |
| 307 | |
| 308 | /** |
| 309 | * Gets the configured <code>ExceptionListener</code> implementation. |
| 310 | * |
| 311 | * @return The configured <code>ExceptionListener</code> implementation. |
| 312 | */ |
| 313 | private ExceptionListener[] getExceptionListener() |
| 314 | { |
| 315 | return (ExceptionListener[]) ContainerFactory.getContainer(). |
| 316 | getDependency( this, "ExceptionListener" ); |
| 317 | |
| 318 | } |
| 319 | |
| 320 | // </editor-fold>//GEN-END:jdtausDependencies |
| 321 | |
| 322 | //------------------------------------------------------------Dependencies-- |
| 323 | } |