org.eclipse.linuxtools.lttng2.control.ui/src/org/eclipse/linuxtools/internal/lttng2/control/ui/views/handlers/DestroySessionHandler.java

   1 /**********************************************************************
   2  * Copyright (c) 2012, 2014 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.control.ui.views.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.control.core.model.TraceSessionState;
  27 import org.eclipse.linuxtools.internal.lttng2.control.ui.Activator;
  28 import org.eclipse.linuxtools.internal.lttng2.control.ui.views.ControlView;
  29 import org.eclipse.linuxtools.internal.lttng2.control.ui.views.dialogs.IConfirmDialog;
  30 import org.eclipse.linuxtools.internal.lttng2.control.ui.views.dialogs.TraceControlDialogFactory;
  31 import org.eclipse.linuxtools.internal.lttng2.control.ui.views.messages.Messages;
  32 import org.eclipse.linuxtools.internal.lttng2.control.ui.views.model.impl.TraceSessionComponent;
  33 import org.eclipse.linuxtools.internal.lttng2.control.ui.views.model.impl.TraceSessionGroup;
  34 import org.eclipse.ui.IWorkbenchPage;
  35 import org.eclipse.ui.IWorkbenchWindow;
  36 import org.eclipse.ui.PlatformUI;
  37
  38 /**
  39  * <p>
  40  * Command handler implementation to destroy one or more trace sessions.
  41  * </p>
  42  *
  43  * @author Bernd Hufmann
  44  */
  45 public class DestroySessionHandler extends BaseControlViewHandler {
  46
  47     // ------------------------------------------------------------------------
  48     // Attributes
  49     // ------------------------------------------------------------------------
  50     /**
  51      * The list of session components the command is to be executed on.
  52      */
  53     private final List<TraceSessionComponent> fSessions = new ArrayList<>();
  54
  55     // ------------------------------------------------------------------------
  56     // Operations
  57     // ------------------------------------------------------------------------
  58
  59     @Override
  60     public Object execute(ExecutionEvent event) throws ExecutionException {
  61
  62         IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  63
  64         if (window == null) {
  65             return false;
  66         }
  67         // Get user confirmation
  68         IConfirmDialog dialog = TraceControlDialogFactory.getInstance().getConfirmDialog();
  69         if (!dialog.openConfirm(window.getShell(),
  70                 Messages.TraceControl_DestroyConfirmationTitle,
  71                 Messages.TraceControl_DestroyConfirmationMessage)) {
  72
  73             return null;
  74         }
  75
  76         Job job = new Job(Messages.TraceControl_DestroySessionJob) {
  77             @Override
  78             protected IStatus run(IProgressMonitor monitor) {
  79                 try {
  80                     // Make a copy of the list of sessions to avoid ConcurrentModificationException when iterating
  81                     // over fSessions, since fSessions is modified in another thread triggered by the tree viewer refresh
  82                     // after removing a session.
  83                     TraceSessionComponent[] sessions = fSessions.toArray(new TraceSessionComponent[fSessions.size()]);
  84
  85                     for (int i = 0; i < sessions.length; i++) {
  86                         // Destroy all selected sessions
  87                         TraceSessionComponent session = sessions[i];
  88                         TraceSessionGroup sessionGroup = (TraceSessionGroup)session.getParent();
  89                         sessionGroup.destroySession(session, monitor);
  90                     }
  91                 } catch (ExecutionException e) {
  92                     return new Status(IStatus.ERROR, Activator.PLUGIN_ID, Messages.TraceControl_DestroySessionFailure, e);
  93                 }
  94                 return Status.OK_STATUS;
  95             }
  96         };
  97         job.setUser(true);
  98         job.schedule();
  99
 100         return null;
 101     }
 102
 103     @Override
 104     public boolean isEnabled() {
 105         // Get workbench page for the Control View
 106         IWorkbenchPage page = getWorkbenchPage();
 107         if (page == null) {
 108             return false;
 109         }
 110         fSessions.clear();
 111
 112         // Check if one or more session are selected
 113         ISelection selection = page.getSelection(ControlView.ID);
 114         if (selection instanceof StructuredSelection) {
 115             StructuredSelection structered = ((StructuredSelection) selection);
 116             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
 117                 Object element = iterator.next();
 118                 if (element instanceof TraceSessionComponent) {
 119                     // Add only TraceSessionComponents that are inactive and not destroyed
 120                     TraceSessionComponent session = (TraceSessionComponent) element;
 121                     if ((session.getSessionState() == TraceSessionState.INACTIVE) && (!session.isDestroyed())) {
 122                         fSessions.add((TraceSessionComponent)element);
 123                     }
 124                 }
 125             }
 126         }
 127         return !fSessions.isEmpty();
 128     }
 129 }