org.eclipse.linuxtools.lttng.ui/src/org/eclipse/linuxtools/internal/lttng/ui/views/control/handlers/ChangeSessionStateHandler.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.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.viewers.ISelection;
  25 import org.eclipse.jface.viewers.StructuredSelection;
  26 import org.eclipse.linuxtools.internal.lttng.ui.Activator;
  27 import org.eclipse.linuxtools.internal.lttng.ui.views.control.ControlView;
  28 import org.eclipse.linuxtools.internal.lttng.ui.views.control.Messages;
  29 import org.eclipse.linuxtools.internal.lttng.ui.views.control.model.TraceSessionState;
  30 import org.eclipse.linuxtools.internal.lttng.ui.views.control.model.impl.TraceSessionComponent;
  31 import org.eclipse.ui.IWorkbenchPage;
  32 import org.eclipse.ui.IWorkbenchWindow;
  33 import org.eclipse.ui.PlatformUI;
  34
  35 /**
  36  * <b><u>ChangeSessionStateHandler</u></b>
  37  * <p>
  38  * Abstract command handler implementation to start or stop one or more trace sessions.
  39  * </p>
  40  */
  41 abstract public class ChangeSessionStateHandler 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<TraceSessionComponent>();
  50
  51     // ------------------------------------------------------------------------
  52     // Accessors
  53     // ------------------------------------------------------------------------
  54
  55     /**
  56      * @return new required state.
  57      */
  58     abstract TraceSessionState getNewState();
  59
  60     // ------------------------------------------------------------------------
  61     // Operations
  62     // ------------------------------------------------------------------------
  63
  64     /**
  65      * Performs the state change on given session.
  66      * @param session - a session which state is to be changed
  67      * @param monitor - a progress monitor
  68      */
  69     abstract public void changeState(TraceSessionComponent session, IProgressMonitor monitor) throws ExecutionException;
  70
  71     /*
  72      * (non-Javadoc)
  73      * @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
  74      */
  75     @Override
  76     public Object execute(ExecutionEvent event) throws ExecutionException {
  77
  78         IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
  79
  80         if (window == null) {
  81             return false;
  82         }
  83
  84         Job job = new Job(Messages.TraceControl_StartSessionJob) {
  85             @Override
  86             protected IStatus run(IProgressMonitor monitor) {
  87                 try {
  88                     for (Iterator<TraceSessionComponent> iterator = fSessions.iterator(); iterator.hasNext();) {
  89
  90                         // Start all selected sessions
  91                         TraceSessionComponent session = (TraceSessionComponent) iterator.next();
  92                         changeState(session, monitor);
  93
  94                         // Set Session state
  95                         session.setSessionState(getNewState());
  96                         session.fireComponentChanged(session);
  97                     }
  98                 } catch (ExecutionException e) {
  99                     return new Status(Status.ERROR, Activator.PLUGIN_ID, e.toString());
 100                 }
 101                 return Status.OK_STATUS;
 102             }
 103         };
 104         job.setUser(true);
 105         job.schedule();
 106         return null;
 107     }
 108
 109     /*
 110      * (non-Javadoc)
 111      * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
 112      */
 113     @Override
 114     public boolean isEnabled() {
 115         // Get workbench page for the Control View
 116         IWorkbenchPage page = getWorkbenchPage();
 117         if (page == null) {
 118             return false;
 119         }
 120
 121         fSessions.clear();
 122
 123         // Check if one or more session are selected
 124         ISelection selection = page.getSelection(ControlView.ID);
 125         if (selection instanceof StructuredSelection) {
 126             StructuredSelection structered = ((StructuredSelection) selection);
 127             for (Iterator<?> iterator = structered.iterator(); iterator.hasNext();) {
 128                 Object element = (Object) iterator.next();
 129                 if (element instanceof TraceSessionComponent) {
 130                     // Add only TraceSessionComponents that are inactive and not destroyed
 131                     TraceSessionComponent session = (TraceSessionComponent) element;
 132                     if ((session.getSessionState() != getNewState()) && (!session.isDestroyed())) {
 133                         fSessions.add((TraceSessionComponent)element);
 134                     }
 135                 }
 136             }
 137         }
 138         return fSessions.size() > 0;
 139     }
 140 }