Introduce UX scheduler

[lgpl/argeo-commons.git] / swt / org.argeo.cms.swt / src / org / argeo / cms / swt / AbstractSwtCmsView.java

diff --git a/swt/org.argeo.cms.swt/src/org/argeo/cms/swt/AbstractSwtCmsView.java b/swt/org.argeo.cms.swt/src/org/argeo/cms/swt/AbstractSwtCmsView.java
index 06bb9be3727c1a81f9ad2dd8f598da15611a38d6..127be0856195fecf7b0d484a16e654030f6849c4 100644 (file)
--- a/swt/org.argeo.cms.swt/src/org/argeo/cms/swt/AbstractSwtCmsView.java
+++ b/swt/org.argeo.cms.swt/src/org/argeo/cms/swt/AbstractSwtCmsView.java
@@ -2,6 +2,8 @@ package org.argeo.cms.swt;
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Timer;
+import java.util.TimerTask;
 import java.util.concurrent.Callable;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
@@ -24,6 +26,20 @@ import org.eclipse.swt.widgets.Display;
 public abstract class AbstractSwtCmsView implements CmsView {
        private final static CmsLog log = CmsLog.getLog(AbstractSwtCmsView.class);
 
+       /** A timer to be used to perform background UX tasks. */
+       private final static Timer uxTimer = new Timer(true);
+
+       static {
+               // purge every day
+               uxTimer.schedule(new TimerTask() {
+
+                       @Override
+                       public void run() {
+                               uxTimer.purge();
+                       }
+               }, 0, 24 * 60 * 60 * 1000);
+       }
+
        protected final String uiName;
 
        protected LoginContext loginContext;
@@ -138,4 +154,37 @@ public abstract class AbstractSwtCmsView implements CmsView {
                }
        }
 
+       @Override
+       public TimerTask schedule(Runnable task, long delay) {
+               TimerTask timerTask = newSwtUxTimerTask(task);
+               uxTimer.schedule(timerTask, delay);
+               return timerTask;
+       }
+
+       @Override
+       public TimerTask schedule(Runnable task, long delay, long period) {
+               TimerTask timerTask = newSwtUxTimerTask(task);
+               uxTimer.schedule(timerTask, delay, period);
+               return timerTask;
+       }
+
+       protected TimerTask newSwtUxTimerTask(Runnable todo) {
+               return new TimerTask() {
+
+                       @Override
+                       public void run() {
+                               synchronized (display) {
+                                       try {
+                                               if (!display.isDisposed()) {
+                                                       display.syncExec(() -> {
+                                                               todo.run();
+                                                       });
+                                               }
+                                       } catch (Exception e) {
+                                               log.error("Cannot run UX timer task", e);
+                                       }
+                               }
+                       }
+               };
+       }
 }