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

   1 /**********************************************************************
   2  * Copyright (c) 2013, 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.MultiStatus;
  23 import org.eclipse.core.runtime.Status;
  24 import org.eclipse.core.runtime.jobs.Job;
  25 import org.eclipse.jface.viewers.ISelection;
  26 import org.eclipse.jface.viewers.StructuredSelection;
  27 import org.eclipse.linuxtools.internal.lttng2.control.core.model.TraceSessionState;
  28 import org.eclipse.linuxtools.internal.lttng2.control.ui.Activator;
  29 import org.eclipse.linuxtools.internal.lttng2.control.ui.views.ControlView;
  30 import org.eclipse.linuxtools.internal.lttng2.control.ui.views.messages.Messages;
  31 import org.eclipse.linuxtools.internal.lttng2.control.ui.views.model.impl.TraceSessionComponent;
  32 import org.eclipse.ui.IWorkbenchPage;
  33
  34 /**
  35  * <p>
  36  * Command handler implementation to record a snapshot.
  37  * </p>
  38  *
  39  * @author Bernd Hufmann
  40  */
  41 public class SnaphshotHandler extends BaseControlViewHandler {
  42
  43     // ------------------------------------------------------------------------
  44     // Attributes
  45     // ------------------------------------------------------------------------
  46     /**
  47      * The list of session components the command is to be executed on.
  48      */
  49     protected List<TraceSessionComponent> fSessions = new ArrayList<>();
  50
  51     // ------------------------------------------------------------------------
  52     // Operations
  53     // ------------------------------------------------------------------------
  54
  55     @Override
  56     public Object execute(ExecutionEvent event) throws ExecutionException {
  57         fLock.lock();
  58         try {
  59             // Make a copy for thread safety
  60             final List<TraceSessionComponent> sessions = new ArrayList<>();
  61             sessions.addAll(fSessions);
  62
  63             Job job = new Job(Messages.TraceControl_RecordSnapshotJob) {
  64                 @Override
  65                 protected IStatus run(IProgressMonitor monitor) {
  66                     MultiStatus status = new MultiStatus(Activator.PLUGIN_ID, IStatus.OK, null, null);
  67                     for (Iterator<TraceSessionComponent> iterator = sessions.iterator(); iterator.hasNext();) {
  68                         try {
  69                             // record snapshot for all selected sessions sequentially
  70                             TraceSessionComponent session = iterator.next();
  71                             session.recordSnapshot(monitor);
  72                             if (monitor.isCanceled()) {
  73                                 status.add(Status.CANCEL_STATUS);
  74                                 break;
  75                             }
  76                         } catch (ExecutionException e) {
  77                             status.add(new Status(IStatus.ERROR, Activator.PLUGIN_ID, Messages.TraceControl_RecordSnapshotFailure, e));
  78                         }
  79                     }
  80                     return status;
  81                 }
  82             };
  83             job.setUser(true);
  84             job.schedule();
  85         } finally {
  86             fLock.unlock();
  87         }
  88         return null;
  89     }
  90
  91     @Override
  92     public boolean isEnabled() {
  93         // Get workbench page for the Control View
  94         IWorkbenchPage page = getWorkbenchPage();
  95         if (page == null) {
  96             return false;
  97         }
  98
  99         List<TraceSessionComponent> sessions = new ArrayList<>(0);
 100
 101         // Check if one session is selected
 102         ISelection selection = page.getSelection(ControlView.ID);
 103         if (selection instanceof StructuredSelection) {
 104             StructuredSelection structered = ((StructuredSelection) selection);
 105             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
 106                 Object element = iterator.next();
 107                 if (element instanceof TraceSessionComponent) {
 108                     // Add only if corresponding TraceSessionComponent is an active snapshot session and not destroyed
 109                     TraceSessionComponent session = (TraceSessionComponent) element;
 110                     if(session.isSnapshotSession() &&
 111                             session.getSessionState() == TraceSessionState.ACTIVE &&
 112                             !session.isDestroyed()) {
 113                         sessions.add(session);
 114                     }
 115                 }
 116             }
 117         }
 118         boolean isEnabled = !sessions.isEmpty();
 119         fLock.lock();
 120         try {
 121             fSessions = null;
 122             if (isEnabled) {
 123                 fSessions = sessions;
 124             }
 125         } finally {
 126             fLock.unlock();
 127         }
 128         return isEnabled;
 129     }
 130 }