plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/util/SingleSWTRequest.java

   1 package net.mograsim.plugin.util;
   2
   3 import java.util.concurrent.atomic.AtomicBoolean;
   4
   5 import org.eclipse.swt.widgets.Display;
   6
   7 /**
   8  * A utility class that requests the asynchronous execution of a Runnable in the SWT Thread. Making a new request before the old one is
   9  * processed will override the old request.
  10  */
  11 public class SingleSWTRequest
  12 {
  13         private AtomicBoolean waiting = new AtomicBoolean();
  14         private Runnable request;
  15
  16         public void request(Runnable request)
  17         {
  18                 synchronized (waiting)
  19                 {
  20                         this.request = request;
  21                         if (!waiting.get())
  22                         {
  23                                 waiting.set(true);
  24                                 Display.getDefault().asyncExec(() ->
  25                                 {
  26                                         synchronized (waiting)
  27                                         {
  28                                                 waiting.set(false);
  29                                                 this.request.run();
  30                                         }
  31                                 });
  32                         }
  33                 }
  34         }
  35 }