ui/rcp/CmsRcpDisplayFactory.java

   1 package org.argeo.cms.ui.rcp;
   2
   3 import java.lang.System.Logger;
   4 import java.lang.System.Logger.Level;
   5 import java.nio.file.Path;
   6
   7 import org.argeo.api.cms.CmsApp;
   8 import org.argeo.cms.util.OS;
   9 import org.eclipse.swt.events.DisposeListener;
  10 import org.eclipse.swt.widgets.Display;
  11
  12 /** Creates the SWT {@link Display} in a dedicated thread. */
  13 public class CmsRcpDisplayFactory {
  14         private final static Logger logger = System.getLogger(CmsRcpDisplayFactory.class.getName());
  15
  16         /** File name in a run directory */
  17         private final static String ARGEO_RCP_URL = "argeo.rcp.url";
  18
  19         /** There is only one display in RCP mode */
  20         private static Display display;
  21
  22         private CmsUiThread uiThread;
  23
  24         private boolean shutdown = false;
  25
  26         public void init() {
  27                 uiThread = new CmsUiThread();
  28                 uiThread.start();
  29                 while (display == null)
  30                         try {
  31                                 Thread.sleep(100);
  32                         } catch (InterruptedException e) {
  33                                 // silent
  34                         }
  35         }
  36
  37         public void destroy() {
  38                 shutdown = true;
  39                 display.wake();
  40                 try {
  41                         uiThread.join();
  42                 } catch (InterruptedException e) {
  43                         // silent
  44                 } finally {
  45                         uiThread = null;
  46                 }
  47         }
  48
  49         class CmsUiThread extends Thread {
  50
  51                 public CmsUiThread() {
  52                         super("CMS UI");
  53                 }
  54
  55                 @Override
  56                 public void run() {
  57                         try {
  58                                 display = Display.getDefault();
  59                                 display.setRuntimeExceptionHandler((e) -> e.printStackTrace());
  60                                 display.setErrorHandler((e) -> e.printStackTrace());
  61
  62                                 while (!shutdown) {
  63                                         if (!display.readAndDispatch())
  64                                                 display.sleep();
  65                                 }
  66                                 display.dispose();
  67                                 display = null;
  68                         } catch (UnsatisfiedLinkError e) {
  69                                 logger.log(Level.ERROR,
  70                                                 "Cannot load SWT, probably because the OSGi framework has been refresh. Restart the application.",
  71                                                 e);
  72                         }
  73                 }
  74         }
  75
  76         public static Display getDisplay() {
  77                 return display;
  78         }
  79
  80         public static void openCmsApp(CmsApp cmsApp, String uiName, DisposeListener disposeListener) {
  81                 CmsRcpDisplayFactory.getDisplay().syncExec(() -> {
  82                         CmsRcpApp cmsRcpApp = new CmsRcpApp(uiName);
  83                         cmsRcpApp.setCmsApp(cmsApp, null);
  84                         cmsRcpApp.initRcpApp();
  85                         if (disposeListener != null)
  86                                 cmsRcpApp.getShell().addDisposeListener(disposeListener);
  87                 });
  88         }
  89
  90         public static Path getUrlRunFile() {
  91                 return OS.getRunDir().resolve(CmsRcpDisplayFactory.ARGEO_RCP_URL);
  92         }
  93 }