added worker thread

diy-layout-creator --username bancika@gmail.com/DIYLC/DIYLCStarter.launch

@@ -11,5 +11,5 @@
 <stringAttribute key="org.eclipse.debug.core.source_locator_memento" value="&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; standalone=&quot;no&quot;?&gt;&#13;&#10;&lt;sourceLookupDirector&gt;&#13;&#10;&lt;sourceContainers duplicates=&quot;false&quot;&gt;&#13;&#10;&lt;container memento=&quot;&amp;lt;?xml version=&amp;quot;1.0&amp;quot; encoding=&amp;quot;UTF-8&amp;quot; standalone=&amp;quot;no&amp;quot;?&amp;gt;&amp;#13;&amp;#10;&amp;lt;javaProject name=&amp;quot;Library&amp;quot;/&amp;gt;&amp;#13;&amp;#10;&quot; typeId=&quot;org.eclipse.jdt.launching.sourceContainer.javaProject&quot;/&gt;&#13;&#10;&lt;container memento=&quot;&amp;lt;?xml version=&amp;quot;1.0&amp;quot; encoding=&amp;quot;UTF-8&amp;quot; standalone=&amp;quot;no&amp;quot;?&amp;gt;&amp;#13;&amp;#10;&amp;lt;javaProject name=&amp;quot;DIYLC&amp;quot;/&amp;gt;&amp;#13;&amp;#10;&quot; typeId=&quot;org.eclipse.jdt.launching.sourceContainer.javaProject&quot;/&gt;&#13;&#10;&lt;container memento=&quot;&amp;lt;?xml version=&amp;quot;1.0&amp;quot; encoding=&amp;quot;UTF-8&amp;quot; standalone=&amp;quot;no&amp;quot;?&amp;gt;&amp;#13;&amp;#10;&amp;lt;default/&amp;gt;&amp;#13;&amp;#10;&quot; typeId=&quot;org.eclipse.debug.core.containerType.default&quot;/&gt;&#13;&#10;&lt;/sourceContainers&gt;&#13;&#10;&lt;/sourceLookupDirector&gt;&#13;&#10;"/>
 <stringAttribute key="org.eclipse.jdt.launching.MAIN_TYPE" value="org.diylc.DIYLCStarter"/>
 <stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="DIYLC"/>
-<stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="-Xms64m -Xmx256m"/>
+<stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="-Xms256m -Xmx512m"/>
 </launchConfiguration>

diy-layout-creator --username bancika@gmail.com/DIYLC/src/org/diylc/common/ITask.java

@@ -0,0 +1,34 @@
+package org.diylc.common;
+
+/**
+ * Abstract layer between the app and platform worker thread implementation.
+ * 
+ * @author Branislav Stojkovic
+ * 
+ * @param <T>
+ */
+public interface ITask<T> {
+
+	/**
+	 * Runs in background thread.
+	 * 
+	 * @return
+	 * @throws Exception
+	 */
+	T doInBackground() throws Exception;
+
+	/**
+	 * Called if background thread fails.
+	 * 
+	 * @param e
+	 */
+	void failed(Exception e);
+
+	/**
+	 * Called if background thread is executed correctly, the result is passed
+	 * as a parameter.
+	 * 
+	 * @param result
+	 */
+	void complete(T result);
+}

diy-layout-creator --username bancika@gmail.com/DIYLC/src/org/diylc/swing/ISwingUI.java

@@ -7,13 +7,15 @@ import javax.swing.SwingConstants;
 import javax.swing.JPopupMenu.Separator;
 
 import org.diylc.common.BadPositionException;
+import org.diylc.common.ITask;
+import org.diylc.core.IView;
 
 /**
  * Interface for plugin access to the swing front end.
  * 
  * @author Branislav Stojkovic
  */
-public interface ISwingUI {
+public interface ISwingUI extends IView {
 
 	/**
 	 * Injects a custom GUI panels provided by the plug-in and desired position
@@ -57,4 +59,6 @@ public interface ISwingUI {
 	 * @param parentMenuName
 	 */
 	void injectSubmenu(String name, Icon icon, String parentMenuName);
+	
+	<T extends Object> void executeBackgroundTask(ITask<T> task);
 }

diy-layout-creator --username bancika@gmail.com/DIYLC/src/org/diylc/swing/gui/MainFrame.java

@@ -2,6 +2,7 @@ package org.diylc.swing.gui;
 
 import java.awt.BorderLayout;
 import java.awt.Container;
+import java.awt.Cursor;
 import java.awt.Dimension;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
@@ -11,6 +12,7 @@ import java.util.Arrays;
 import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.ExecutionException;
 
 import javax.swing.Action;
 import javax.swing.BoxLayout;
@@ -23,6 +25,7 @@ import javax.swing.JMenuBar;
 import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 import javax.swing.SwingConstants;
+import javax.swing.SwingWorker;
 import javax.swing.Timer;
 
 import org.apache.log4j.Logger;
@@ -30,6 +33,7 @@ import org.diylc.common.BadPositionException;
 import org.diylc.common.EventType;
 import org.diylc.common.IPlugIn;
 import org.diylc.common.IPlugInPort;
+import org.diylc.common.ITask;
 import org.diylc.core.IView;
 import org.diylc.images.IconLoader;
 import org.diylc.presenter.Presenter;
@@ -42,7 +46,7 @@ import org.diylc.swing.plugins.layers.LayersMenuPlugin;
 import org.diylc.swing.plugins.statusbar.StatusBar;
 import org.diylc.swing.plugins.toolbox.ToolBox;
 
-public class MainFrame extends JFrame implements IView, ISwingUI {
+public class MainFrame extends JFrame implements ISwingUI {
 
 	private static final Logger LOG = Logger.getLogger(MainFrame.class);
 
@@ -248,6 +252,31 @@ public class MainFrame extends JFrame implements IView, ISwingUI {
 		menuMap.put(name, submenu);
 	}
 
+	@Override
+	public <T extends Object> void executeBackgroundTask(final ITask<T> task) {
+		setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
+		SwingWorker<T, Void> worker = new SwingWorker<T, Void>() {
+
+			@Override
+			protected T doInBackground() throws Exception {
+				return task.doInBackground();
+			}
+
+			@Override
+			protected void done() {
+				try {
+					T result = get();
+					task.complete(result);
+				} catch (Exception e) {
+					LOG.error("Task failed", e);
+					task.failed(e);
+				}
+				setCursor(Cursor.getDefaultCursor());
+			}
+		};
+		worker.execute();
+	}
+
 	class FramePlugin implements IPlugIn {
 
 		private IPlugInPort plugInPort;

diy-layout-creator --username bancika@gmail.com/DIYLC/src/org/diylc/swing/plugins/file/FileMenuPlugin.java

@@ -3,7 +3,6 @@ package org.diylc.swing.plugins.file;
 import java.awt.event.ActionEvent;
 import java.awt.print.PrinterException;
 import java.io.File;
-import java.io.FileNotFoundException;
 import java.util.EnumSet;
 import java.util.List;
 
@@ -13,9 +12,9 @@ import org.apache.log4j.Logger;
 import org.diylc.common.EventType;
 import org.diylc.common.IPlugIn;
 import org.diylc.common.IPlugInPort;
+import org.diylc.common.ITask;
 import org.diylc.common.PropertyWrapper;
 import org.diylc.images.IconLoader;
-import org.diylc.presenter.Presenter;
 import org.diylc.swing.ISwingUI;
 import org.diylc.swing.gui.DialogFactory;
 import org.diylc.swing.gui.editor.PropertyEditorDialog;
@@ -23,7 +22,6 @@ import org.diylc.swing.gui.editor.PropertyEditorDialog;
 import com.diyfever.gui.ButtonDialog;
 import com.diyfever.gui.IDrawingProvider;
 import com.diyfever.gui.export.DrawingExporter;
-import com.lowagie.text.DocumentException;
 
 /**
  * Entry point class for File management utilities.
@@ -87,7 +85,7 @@ public class FileMenuPlugin implements IPlugIn {
 			if (!plugInPort.allowFileAction()) {
 				return;
 			}
-						plugInPort.createNewProject();
+			plugInPort.createNewProject();
 			List<PropertyWrapper> properties = plugInPort.getProjectProperties();
 			PropertyEditorDialog editor = DialogFactory.getInstance().createPropertyEditorDialog(
 					properties, "Edit Project");
@@ -121,11 +119,29 @@ public class FileMenuPlugin implements IPlugIn {
 			if (!plugInPort.allowFileAction()) {
 				return;
 			}
-			File file = DialogFactory.getInstance().showOpenDialog(FileFilterEnum.DIY.getFilter(),
+			final File file = DialogFactory.getInstance().showOpenDialog(
-					null, FileFilterEnum.DIY.getExtensions()[0], null);
+					FileFilterEnum.DIY.getFilter(), null, FileFilterEnum.DIY.getExtensions()[0],
+					null);
 			if (file != null) {
-				LOG.debug("Opening from " + file.getAbsolutePath());
+				swingUI.executeBackgroundTask(new ITask<Void>() {
-				plugInPort.loadProjectFromFile(file.getAbsolutePath());
+
+					@Override
+					public Void doInBackground() throws Exception {
+						LOG.debug("Opening from " + file.getAbsolutePath());
+						plugInPort.loadProjectFromFile(file.getAbsolutePath());
+						return null;
+					}
+
+					@Override
+					public void complete(Void result) {
+					}
+
+					@Override
+					public void failed(Exception e) {
+						swingUI.showMessage("Could not open file. " + e.getMessage(), "Error",
+								ISwingUI.ERROR_MESSAGE);
+					}
+				});
 			}
 		}
 	}
@@ -144,16 +160,50 @@ public class FileMenuPlugin implements IPlugIn {
 		public void actionPerformed(ActionEvent e) {
 			LOG.info("SaveAction triggered");
 			if (plugInPort.getCurrentFileName() == null) {
-				File file = DialogFactory.getInstance().showSaveDialog(
+				final File file = DialogFactory.getInstance().showSaveDialog(
 						FileFilterEnum.DIY.getFilter(), null,
 						FileFilterEnum.DIY.getExtensions()[0], null);
 				if (file != null) {
-					LOG.debug("Saving to " + file.getAbsolutePath());
+					swingUI.executeBackgroundTask(new ITask<Void>() {
-					plugInPort.saveProjectToFile(file.getAbsolutePath());
+
+						@Override
+						public Void doInBackground() throws Exception {
+							LOG.debug("Saving to " + file.getAbsolutePath());
+							plugInPort.saveProjectToFile(file.getAbsolutePath());
+							return null;
+						}
+
+						@Override
+						public void complete(Void result) {
+						}
+
+						@Override
+						public void failed(Exception e) {
+							swingUI.showMessage("Could not save to file. " + e.getMessage(),
+									"Error", ISwingUI.ERROR_MESSAGE);
+						}
+					});
 				}
 			} else {
-				LOG.debug("Exporting to " + plugInPort.getCurrentFileName());
+				swingUI.executeBackgroundTask(new ITask<Void>() {
-				plugInPort.saveProjectToFile(plugInPort.getCurrentFileName());
+
+					@Override
+					public Void doInBackground() throws Exception {
+						LOG.debug("Saving to " + plugInPort.getCurrentFileName());
+						plugInPort.saveProjectToFile(plugInPort.getCurrentFileName());
+						return null;
+					}
+
+					@Override
+					public void complete(Void result) {
+					}
+
+					@Override
+					public void failed(Exception e) {
+						swingUI.showMessage("Could not save to file. " + e.getMessage(), "Error",
+								ISwingUI.ERROR_MESSAGE);
+					}
+				});
 			}
 		}
 	}
@@ -171,11 +221,29 @@ public class FileMenuPlugin implements IPlugIn {
 		@Override
 		public void actionPerformed(ActionEvent e) {
 			LOG.info("SaveAsAction triggered");
-			File file = DialogFactory.getInstance().showSaveDialog(FileFilterEnum.DIY.getFilter(),
+			final File file = DialogFactory.getInstance().showSaveDialog(
-					null, FileFilterEnum.DIY.getExtensions()[0], null);
+					FileFilterEnum.DIY.getFilter(), null, FileFilterEnum.DIY.getExtensions()[0],
+					null);
 			if (file != null) {
-				LOG.debug("Save to " + file.getAbsolutePath());
+				swingUI.executeBackgroundTask(new ITask<Void>() {
-				plugInPort.saveProjectToFile(file.getAbsolutePath());
+
+					@Override
+					public Void doInBackground() throws Exception {
+						LOG.debug("Saving to " + file.getAbsolutePath());
+						plugInPort.saveProjectToFile(file.getAbsolutePath());
+						return null;
+					}
+
+					@Override
+					public void complete(Void result) {
+					}
+
+					@Override
+					public void failed(Exception e) {
+						swingUI.showMessage("Could not save to file. " + e.getMessage(), "Error",
+								ISwingUI.ERROR_MESSAGE);
+					}
+				});
 			}
 		}
 	}
@@ -216,19 +284,30 @@ public class FileMenuPlugin implements IPlugIn {
 		@Override
 		public void actionPerformed(ActionEvent e) {
 			LOG.info("ExportPDFAction triggered");
-			File file = DialogFactory.getInstance().showSaveDialog(FileFilterEnum.PDF.getFilter(),
+			final File file = DialogFactory.getInstance().showSaveDialog(
-					null, FileFilterEnum.PDF.getExtensions()[0], null);
+					FileFilterEnum.PDF.getFilter(), null, FileFilterEnum.PDF.getExtensions()[0],
+					null);
 			if (file != null) {
-				try {
+				swingUI.executeBackgroundTask(new ITask<Void>() {
-					LOG.debug("Exporting to " + file.getAbsolutePath());
+
-					DrawingExporter.getInstance().exportPDF(this.drawingProvider, file);
+					@Override
-				} catch (FileNotFoundException e1) {
+					public Void doInBackground() throws Exception {
-					// TODO Auto-generated catch block
+						LOG.debug("Exporting to " + file.getAbsolutePath());
-					e1.printStackTrace();
+						DrawingExporter.getInstance().exportPDF(
-				} catch (DocumentException e1) {
+								ExportPDFAction.this.drawingProvider, file);
-					// TODO Auto-generated catch block
+						return null;
-					e1.printStackTrace();
+					}
-				}
+
+					@Override
+					public void complete(Void result) {
+					}
+
+					@Override
+					public void failed(Exception e) {
+						swingUI.showMessage("Could not export to PDF. " + e.getMessage(), "Error",
+								ISwingUI.ERROR_MESSAGE);
+					}
+				});
 			}
 		}
 	}
@@ -249,11 +328,30 @@ public class FileMenuPlugin implements IPlugIn {
 		@Override
 		public void actionPerformed(ActionEvent e) {
 			LOG.info("ExportPNGAction triggered");
-			File file = DialogFactory.getInstance().showSaveDialog(FileFilterEnum.PNG.getFilter(),
+			final File file = DialogFactory.getInstance().showSaveDialog(
-					null, FileFilterEnum.PNG.getExtensions()[0], null);
+					FileFilterEnum.PNG.getFilter(), null, FileFilterEnum.PNG.getExtensions()[0],
+					null);
 			if (file != null) {
-				LOG.debug("Exporting to " + file.getAbsolutePath());
+				swingUI.executeBackgroundTask(new ITask<Void>() {
-				DrawingExporter.getInstance().exportPNG(this.drawingProvider, file);
+
+					@Override
+					public Void doInBackground() throws Exception {
+						LOG.debug("Exporting to " + file.getAbsolutePath());
+						DrawingExporter.getInstance().exportPNG(
+								ExportPNGAction.this.drawingProvider, file);
+						return null;
+					}
+
+					@Override
+					public void complete(Void result) {
+					}
+
+					@Override
+					public void failed(Exception e) {
+						swingUI.showMessage("Could not export to PNG. " + e.getMessage(), "Error",
+								ISwingUI.ERROR_MESSAGE);
+					}
+				});
 			}
 		}
 	}