bundles/org.simantics.workbench/src/org/simantics/workbench/internal/contributions/FlushRequestsButtonTrim.java

   1 /*******************************************************************************
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
   3  * in Industry THTH ry.
   4  * All rights reserved. This program and the accompanying materials
   5  * are made available under the terms of the Eclipse Public License v1.0
   6  * which accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *     VTT Technical Research Centre of Finland - initial API and implementation
  11  *******************************************************************************/
  12 package org.simantics.workbench.internal.contributions;
  13
  14 import org.eclipse.jface.resource.JFaceResources;
  15 import org.eclipse.jface.resource.LocalResourceManager;
  16 import org.eclipse.swt.SWT;
  17 import org.eclipse.swt.events.DisposeEvent;
  18 import org.eclipse.swt.events.DisposeListener;
  19 import org.eclipse.swt.events.SelectionAdapter;
  20 import org.eclipse.swt.events.SelectionEvent;
  21 import org.eclipse.swt.layout.FillLayout;
  22 import org.eclipse.swt.widgets.Button;
  23 import org.eclipse.swt.widgets.Composite;
  24 import org.simantics.Simantics;
  25 import org.simantics.db.Session;
  26 import org.simantics.db.management.ISessionContext;
  27 import org.simantics.db.management.ISessionContextChangedListener;
  28 import org.simantics.db.management.ISessionContextProvider;
  29 import org.simantics.db.management.SessionContextChangedEvent;
  30 import org.simantics.ui.jobs.SessionGarbageCollectorJob;
  31 import org.simantics.workbench.internal.Activator;
  32
  33 /**
  34  * @author Tuukka Lehtonen
  35  */
  36 public class FlushRequestsButtonTrim extends Composite {
  37
  38     LocalResourceManager resourceManager;
  39
  40     class SessionContextListener implements ISessionContextChangedListener {
  41         @Override
  42         public void sessionContextChanged(final SessionContextChangedEvent event) {
  43             if (isDisposed())
  44                 return;
  45             getDisplay().asyncExec(new Runnable() {
  46                 @Override
  47                 public void run() {
  48                     if (isDisposed())
  49                         return;
  50                     sessionChanged(event.getNewValue());
  51                 }
  52             });
  53         }
  54     }
  55
  56     SessionContextListener listener = new SessionContextListener();
  57     private Button b;
  58
  59     public FlushRequestsButtonTrim(Composite parent) {
  60         super(parent, SWT.NONE);
  61
  62         setLayout(new FillLayout());
  63
  64         b = new Button(this, SWT.PUSH);
  65         this.resourceManager = new LocalResourceManager(JFaceResources.getResources(), b);
  66
  67         final ISessionContextProvider provider = Simantics.getSessionContextProvider();
  68         if (provider != null) {
  69             provider.addContextChangedListener(listener);
  70         }
  71
  72         b.setToolTipText("Flush database caches");
  73         b.setImage(resourceManager.createImage(Activator.getImageDescriptor("img/paintcan.png")));
  74         b.addSelectionListener(new SelectionAdapter() {
  75             @Override
  76             public void widgetSelected(SelectionEvent e) {
  77                 Session session = Simantics.peekSession();
  78                 if (session != null)
  79                     SessionGarbageCollectorJob.getInstance().rescheduleNow();
  80             }
  81         });
  82         b.addDisposeListener(new DisposeListener() {
  83             @Override
  84             public void widgetDisposed(DisposeEvent e) {
  85                 provider.removeContextChangedListener(listener);
  86             }
  87         });
  88
  89         sessionChanged(Simantics.getSessionContext());
  90     }
  91
  92     private void sessionChanged(ISessionContext sessionContext) {
  93         b.setEnabled(sessionContext != null);
  94     }
  95
  96 }