1 /* 2 * aTunes 3 * Copyright (C) Alex Aranda, Sylvain Gaudard and contributors 4 * 5 * See http://www.atunes.org/wiki/index.php?title=Contributing for information about contributors 6 * 7 * http://www.atunes.org 8 * http://sourceforge.net/projects/atunes 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 2 13 * of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 */ 20 21 package net.sourceforge.atunes.kernel.modules.process; 22 23 import java.awt.event.ActionEvent; 24 import java.awt.event.ActionListener; 25 import java.util.List; 26 import java.util.concurrent.CopyOnWriteArrayList; 27 28 import javax.swing.SwingUtilities; 29 30 import net.sourceforge.atunes.model.IDialogFactory; 31 import net.sourceforge.atunes.model.IProcess; 32 import net.sourceforge.atunes.model.IProcessListener; 33 import net.sourceforge.atunes.model.IProgressDialog; 34 import net.sourceforge.atunes.utils.I18nUtils; 35 import net.sourceforge.atunes.utils.Logger; 36 37 /** 38 * A Process represents a task to be done in background. While task is being 39 * executed it updates a progress dialog. Also represents a common and easy way 40 * to implement new background processes extending this class 41 * 42 * @author alex 43 * 44 * @param <T> 45 */ 46 public abstract class AbstractProcess<T> implements Runnable, IProcess<T> { 47 48 /** 49 * List of listeners notified when Process ends or is canceled 50 */ 51 private volatile List<IProcessListener<T>> listeners; 52 53 /** 54 * Flag indicating if process has been canceled 55 */ 56 private volatile boolean canceled = false; 57 58 /** 59 * Size of this process. This can be for example the total number of files 60 * to copy, to delete, ... 61 */ 62 private volatile long processSize; 63 64 /** 65 * The dialog used to show the progress of this process 66 */ 67 private IProgressDialog progressDialog; 68 69 private IDialogFactory dialogFactory; 70 71 /** 72 * @param dialogFactory 73 */ setDialogFactory(IDialogFactory dialogFactory)74 public void setDialogFactory(IDialogFactory dialogFactory) { 75 this.dialogFactory = dialogFactory; 76 } 77 78 /** 79 * Adds a listener to this process 80 * 81 * @param listener 82 */ 83 @Override addProcessListener(IProcessListener<T> listener)84 public final void addProcessListener(IProcessListener<T> listener) { 85 if (listeners == null) { 86 listeners = new CopyOnWriteArrayList<IProcessListener<T>>(); 87 } 88 listeners.add(listener); 89 } 90 91 /** 92 * Removes a listener of this process 93 * 94 * @param listener 95 */ 96 @Override removeProcessListener(IProcessListener<T> listener)97 public final void removeProcessListener(IProcessListener<T> listener) { 98 if (listeners != null) { 99 listeners.remove(listener); 100 } 101 } 102 103 /** 104 * Returns a message to be shown in progress dialog. Processes can override 105 * this method to show custom information 106 * 107 * @return 108 */ getProgressDialogInformation()109 protected String getProgressDialogInformation() { 110 return I18nUtils.getString("PLEASE_WAIT"); 111 } 112 113 /** 114 * Used to cancel this process 115 */ cancelProcess()116 protected final void cancelProcess() { 117 canceled = true; 118 } 119 120 /** 121 * Executes this process 122 */ 123 @Override execute()124 public final void execute() { 125 // Add a debug log entry 126 Logger.debug(this.getClass().getName()); 127 128 // Get size of this process 129 this.processSize = getProcessSize(); 130 131 // Create new thread to run process 132 Thread t = new Thread(this); 133 134 // Run... 135 t.start(); 136 } 137 138 /** 139 * Returns progress dialog used in this process 140 * 141 * @return 142 */ getProgressDialog()143 protected IProgressDialog getProgressDialog() { 144 if (progressDialog == null) { 145 progressDialog = dialogFactory.newDialog("progressDialog", 146 IProgressDialog.class); 147 progressDialog.setTitle(getProgressDialogTitle()); 148 progressDialog.setInfoText(getProgressDialogInformation()); 149 progressDialog.setCurrentProgress(0); 150 progressDialog.setProgressBarValue(0); 151 progressDialog.addCancelButtonActionListener(new ActionListener() { 152 @Override 153 public void actionPerformed(ActionEvent e) { 154 // When cancel disable cancel button 155 cancelProcess(); 156 progressDialog.disableCancelButton(); 157 } 158 }); 159 } 160 return progressDialog; 161 } 162 163 /** 164 * Shows progress dialog 165 */ showProgressDialog()166 private final void showProgressDialog() { 167 try { 168 SwingUtilities.invokeAndWait(new Runnable() { 169 @Override 170 public void run() { 171 // Set process size in dialog 172 getProgressDialog().setTotalProgress(processSize); 173 174 // Show dialog 175 getProgressDialog().showDialog(); 176 } 177 }); 178 } catch (Exception e) { 179 Logger.error(e); 180 } 181 } 182 183 /** 184 * Hide progress dialog 185 */ hideProgressDialog()186 private final void hideProgressDialog() { 187 try { 188 SwingUtilities.invokeAndWait(new Runnable() { 189 public void run() { 190 getProgressDialog().hideDialog(); 191 } 192 }); 193 } catch (Exception e) { 194 Logger.error(e); 195 } 196 } 197 198 /** 199 * Sets the current progress of this process. This method should be called 200 * every time process wants to increase progress indicator 201 * 202 * @param currentProgress 203 */ setCurrentProgress(final long currentProgress)204 protected final void setCurrentProgress(final long currentProgress) { 205 try { 206 SwingUtilities.invokeAndWait(new Runnable() { 207 @Override 208 public void run() { 209 getProgressDialog().setCurrentProgress(currentProgress); 210 getProgressDialog().setProgressBarValue( 211 (int) ((currentProgress * 100.0) / processSize)); 212 } 213 }); 214 } catch (Exception e) { 215 Logger.error(e); 216 } 217 } 218 219 /** 220 * Returns a string for the title of progress dialog 221 * 222 * @return 223 */ getProgressDialogTitle()224 protected abstract String getProgressDialogTitle(); 225 226 /** 227 * Code of the process 228 * 229 * @return <code>true</code> if process is executed successfully, 230 * <code>false</code>otherwise 231 */ runProcess()232 protected abstract boolean runProcess(); 233 234 /** 235 * Code to be executed after process cancellation 236 */ runCancel()237 protected abstract void runCancel(); 238 239 /** 240 * @return process result 241 */ getProcessResult()242 protected abstract T getProcessResult(); 243 244 /** 245 * Returns process size 246 * 247 * @return 248 */ getProcessSize()249 protected abstract long getProcessSize(); 250 251 /** 252 * @return the canceled 253 */ isCanceled()254 protected boolean isCanceled() { 255 return canceled; 256 } 257 258 @Override run()259 public final void run() { 260 // Show progress dialog 261 showProgressDialog(); 262 263 // Run process code 264 boolean ok = runProcess(); 265 266 // Process finished: hide progress dialog 267 hideProgressDialog(); 268 269 // If process has been canceled then execute cancel code 270 if (canceled) { 271 runCancel(); 272 } 273 274 // Notify all listeners 275 if (listeners != null && !listeners.isEmpty()) { 276 for (IProcessListener<T> listener : listeners) { 277 if (canceled) { 278 listener.processCanceled(); 279 } else { 280 listener.processFinished(ok, getProcessResult()); 281 } 282 } 283 } 284 } 285 286 /** 287 * @return 288 */ getDialogFactory()289 protected IDialogFactory getDialogFactory() { 290 return dialogFactory; 291 } 292 } 293