org.eclipse.linuxtools.lttng.ui/src/org/eclipse/linuxtools/lttng/ui/views/control/handlers/DestroySessionHandler.java

   1 /**********************************************************************
   2  * Copyright (c) 2012 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Bernd Hufmann - Initial API and implementation
  11  **********************************************************************/
  12 package org.eclipse.linuxtools.lttng.ui.views.control.handlers;
  13
  14 import java.util.ArrayList;
  15 import java.util.Iterator;
  16 import java.util.List;
  17
  18 import org.eclipse.core.commands.ExecutionEvent;
  19 import org.eclipse.core.commands.ExecutionException;
  20 import org.eclipse.core.runtime.IProgressMonitor;
  21 import org.eclipse.core.runtime.IStatus;
  22 import org.eclipse.core.runtime.Status;
  23 import org.eclipse.core.runtime.jobs.Job;
  24 import org.eclipse.jface.dialogs.MessageDialog;
  25 import org.eclipse.jface.viewers.ISelection;
  26 import org.eclipse.jface.viewers.StructuredSelection;
  27 import org.eclipse.linuxtools.lttng.ui.LTTngUiPlugin;
  28 import org.eclipse.linuxtools.lttng.ui.views.control.ControlView;
  29 import org.eclipse.linuxtools.lttng.ui.views.control.Messages;
  30 import org.eclipse.linuxtools.lttng.ui.views.control.model.TraceSessionState;
  31 import org.eclipse.linuxtools.lttng.ui.views.control.model.impl.TraceSessionComponent;
  32 import org.eclipse.linuxtools.lttng.ui.views.control.model.impl.TraceSessionGroup;
  33 import org.eclipse.ui.IWorkbenchPage;
  34 import org.eclipse.ui.IWorkbenchWindow;
  35 import org.eclipse.ui.PlatformUI;
  36
  37 /**
  38  * <b><u>DestroySessionHandler</u></b>
  39  * <p>
  40  * Command handler implementation to destroy one or more trace sessions.
  41  * </p>
  42  */
  43 public class DestroySessionHandler extends BaseControlViewHandler {
  44
  45     // ------------------------------------------------------------------------
  46     // Attributes
  47     // ------------------------------------------------------------------------
  48     /**
  49      * The list of session components the command is to be executed on.
  50      */
  51     private List<TraceSessionComponent> fSessions = new ArrayList<TraceSessionComponent>();
  52
  53     // ------------------------------------------------------------------------
  54     // Operations
  55     // ------------------------------------------------------------------------
  56     /*
  57      * (non-Javadoc)
  58      * @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
  59      */
  60     @Override
  61     public Object execute(ExecutionEvent event) throws ExecutionException {
  62
  63         IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  64
  65         if (window == null) {
  66             return false;
  67         }
  68         // Get user confirmation
  69         if (!MessageDialog.openConfirm(window.getShell(),
  70                 Messages.TraceControl_DestroyConfirmationTitle,
  71                 Messages.TraceControl_DestroyConfirmationMessage)) {
  72
  73             return null;
  74
  75         }
  76
  77         Job job = new Job(Messages.TraceControl_DestroySessionJob) {
  78             @Override
  79             protected IStatus run(IProgressMonitor monitor) {
  80                 try {
  81                     // Make a copy of the list of sessions to avoid ConcurrentModificationException when iterating
  82                     // over fSessions, since fSessions is modified in another thread triggered by the tree viewer refresh
  83                     // after removing a session.
  84                     TraceSessionComponent[] sessions = (TraceSessionComponent[])fSessions.toArray(new TraceSessionComponent[fSessions.size()]);
  85
  86                     for (int i = 0; i < sessions.length; i++) {
  87                         // Destroy all selected sessions
  88                         TraceSessionComponent session = sessions[i];
  89                         TraceSessionGroup sessionGroup = (TraceSessionGroup)session.getParent();
  90                         sessionGroup.destroySession(session, monitor);
  91                     }
  92                 } catch (ExecutionException e) {
  93                     return new Status(Status.ERROR, LTTngUiPlugin.PLUGIN_ID, e.toString());
  94                 }
  95                 return Status.OK_STATUS;
  96             }
  97         };
  98         job.setUser(true);
  99         job.schedule();
 100
 101         return null;
 102     }
 103
 104     /*
 105      * (non-Javadoc)
 106      * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
 107      */
 108     @Override
 109     public boolean isEnabled() {
 110         // Get workbench page for the Control View
 111         IWorkbenchPage page = getWorkbenchPage();
 112         if (page == null) {
 113             return false;
 114         }
 115         fSessions.clear();
 116
 117         // Check if one or more session are selected
 118         ISelection selection = page.getSelection(ControlView.ID);
 119         if (selection instanceof StructuredSelection) {
 120             StructuredSelection structered = ((StructuredSelection) selection);
 121             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
 122                 Object element = (Object) iterator.next();
 123                 if (element instanceof TraceSessionComponent) {
 124                     // Add only TraceSessionComponents that are inactive and not destroyed
 125                     TraceSessionComponent session = (TraceSessionComponent) element;
 126                     if ((session.getSessionState() == TraceSessionState.INACTIVE) && (!session.isDestroyed())) {
 127                         fSessions.add((TraceSessionComponent)element);
 128                     }
 129                 }
 130             }
 131         }
 132         return fSessions.size() > 0;
 133     }
 134 }