org.eclipse.linuxtools.lttng2.ui/src/org/eclipse/linuxtools/internal/lttng2/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.internal.lttng2.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.viewers.ISelection;
  25 import org.eclipse.jface.viewers.StructuredSelection;
  26 import org.eclipse.linuxtools.internal.lttng2.core.control.model.TraceSessionState;
  27 import org.eclipse.linuxtools.internal.lttng2.ui.Activator;
  28 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.ControlView;
  29 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.dialogs.IConfirmDialog;
  30 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.dialogs.TraceControlDialogFactory;
  31 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.messages.Messages;
  32 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.model.impl.TraceSessionComponent;
  33 import org.eclipse.linuxtools.internal.lttng2.ui.views.control.model.impl.TraceSessionGroup;
  34 import org.eclipse.ui.IWorkbenchPage;
  35 import org.eclipse.ui.IWorkbenchWindow;
  36 import org.eclipse.ui.PlatformUI;
  37
  38 /**
  39  * <b><u>DestroySessionHandler</u></b>
  40  * <p>
  41  * Command handler implementation to destroy one or more trace sessions.
  42  * </p>
  43  */
  44 public class DestroySessionHandler extends BaseControlViewHandler {
  45
  46     // ------------------------------------------------------------------------
  47     // Attributes
  48     // ------------------------------------------------------------------------
  49     /**
  50      * The list of session components the command is to be executed on.
  51      */
  52     private List<TraceSessionComponent> fSessions = new ArrayList<TraceSessionComponent>();
  53
  54     // ------------------------------------------------------------------------
  55     // Operations
  56     // ------------------------------------------------------------------------
  57     /*
  58      * (non-Javadoc)
  59      * @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
  60      */
  61     @Override
  62     public Object execute(ExecutionEvent event) throws ExecutionException {
  63
  64         IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  65
  66         if (window == null) {
  67             return false;
  68         }
  69         // Get user confirmation
  70         IConfirmDialog dialog = TraceControlDialogFactory.getInstance().getConfirmDialog();
  71         if (!dialog.openConfirm(window.getShell(),
  72                 Messages.TraceControl_DestroyConfirmationTitle,
  73                 Messages.TraceControl_DestroyConfirmationMessage)) {
  74
  75             return null;
  76         }
  77
  78         Job job = new Job(Messages.TraceControl_DestroySessionJob) {
  79             @Override
  80             protected IStatus run(IProgressMonitor monitor) {
  81                 try {
  82                     // Make a copy of the list of sessions to avoid ConcurrentModificationException when iterating
  83                     // over fSessions, since fSessions is modified in another thread triggered by the tree viewer refresh
  84                     // after removing a session.
  85                     TraceSessionComponent[] sessions = (TraceSessionComponent[])fSessions.toArray(new TraceSessionComponent[fSessions.size()]);
  86
  87                     for (int i = 0; i < sessions.length; i++) {
  88                         // Destroy all selected sessions
  89                         TraceSessionComponent session = sessions[i];
  90                         TraceSessionGroup sessionGroup = (TraceSessionGroup)session.getParent();
  91                         sessionGroup.destroySession(session, monitor);
  92                     }
  93                 } catch (ExecutionException e) {
  94                     return new Status(Status.ERROR, Activator.PLUGIN_ID, Messages.TraceControl_DestroySessionFailure, e);
  95                 }
  96                 return Status.OK_STATUS;
  97             }
  98         };
  99         job.setUser(true);
 100         job.schedule();
 101
 102         return null;
 103     }
 104
 105     /*
 106      * (non-Javadoc)
 107      * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
 108      */
 109     @Override
 110     public boolean isEnabled() {
 111         // Get workbench page for the Control View
 112         IWorkbenchPage page = getWorkbenchPage();
 113         if (page == null) {
 114             return false;
 115         }
 116         fSessions.clear();
 117
 118         // Check if one or more session are selected
 119         ISelection selection = page.getSelection(ControlView.ID);
 120         if (selection instanceof StructuredSelection) {
 121             StructuredSelection structered = ((StructuredSelection) selection);
 122             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
 123                 Object element = (Object) iterator.next();
 124                 if (element instanceof TraceSessionComponent) {
 125                     // Add only TraceSessionComponents that are inactive and not destroyed
 126                     TraceSessionComponent session = (TraceSessionComponent) element;
 127                     if ((session.getSessionState() == TraceSessionState.INACTIVE) && (!session.isDestroyed())) {
 128                         fSessions.add((TraceSessionComponent)element);
 129                     }
 130                 }
 131             }
 132         }
 133         return !fSessions.isEmpty();
 134     }
 135 }