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  * <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<TraceSessionComponent>();
  54
  55     // ------------------------------------------------------------------------
  56     // Operations
  57     // ------------------------------------------------------------------------
  58     /*
  59      * (non-Javadoc)
  60      * @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
  61      */
  62     @Override
  63     public Object execute(ExecutionEvent event) throws ExecutionException {
  64
  65         IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  66
  67         if (window == null) {
  68             return false;
  69         }
  70         // Get user confirmation
  71         IConfirmDialog dialog = TraceControlDialogFactory.getInstance().getConfirmDialog();
  72         if (!dialog.openConfirm(window.getShell(),
  73                 Messages.TraceControl_DestroyConfirmationTitle,
  74                 Messages.TraceControl_DestroyConfirmationMessage)) {
  75
  76             return null;
  77         }
  78
  79         Job job = new Job(Messages.TraceControl_DestroySessionJob) {
  80             @Override
  81             protected IStatus run(IProgressMonitor monitor) {
  82                 try {
  83                     // Make a copy of the list of sessions to avoid ConcurrentModificationException when iterating
  84                     // over fSessions, since fSessions is modified in another thread triggered by the tree viewer refresh
  85                     // after removing a session.
  86                     TraceSessionComponent[] sessions = fSessions.toArray(new TraceSessionComponent[fSessions.size()]);
  87
  88                     for (int i = 0; i < sessions.length; i++) {
  89                         // Destroy all selected sessions
  90                         TraceSessionComponent session = sessions[i];
  91                         TraceSessionGroup sessionGroup = (TraceSessionGroup)session.getParent();
  92                         sessionGroup.destroySession(session, monitor);
  93                     }
  94                 } catch (ExecutionException e) {
  95                     return new Status(IStatus.ERROR, Activator.PLUGIN_ID, Messages.TraceControl_DestroySessionFailure, e);
  96                 }
  97                 return Status.OK_STATUS;
  98             }
  99         };
 100         job.setUser(true);
 101         job.schedule();
 102
 103         return null;
 104     }
 105
 106     /*
 107      * (non-Javadoc)
 108      * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
 109      */
 110     @Override
 111     public boolean isEnabled() {
 112         // Get workbench page for the Control View
 113         IWorkbenchPage page = getWorkbenchPage();
 114         if (page == null) {
 115             return false;
 116         }
 117         fSessions.clear();
 118
 119         // Check if one or more session are selected
 120         ISelection selection = page.getSelection(ControlView.ID);
 121         if (selection instanceof StructuredSelection) {
 122             StructuredSelection structered = ((StructuredSelection) selection);
 123             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
 124                 Object element = iterator.next();
 125                 if (element instanceof TraceSessionComponent) {
 126                     // Add only TraceSessionComponents that are inactive and not destroyed
 127                     TraceSessionComponent session = (TraceSessionComponent) element;
 128                     if ((session.getSessionState() == TraceSessionState.INACTIVE) && (!session.isDestroyed())) {
 129                         fSessions.add((TraceSessionComponent)element);
 130                     }
 131                 }
 132             }
 133         }
 134         return !fSessions.isEmpty();
 135     }
 136 }