diff -r 000000000000 -r 35da2d439e3d samples/openfixed/src/org/apidesign/openfixed/PendingEventSupport.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/openfixed/src/org/apidesign/openfixed/PendingEventSupport.java	Sun Mar 20 18:52:47 2011 +0100
@@ -0,0 +1,67 @@
+package org.apidesign.openfixed;
+
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+final class PendingEventSupport implements EventSupport, Runnable {
+    private final List<ModificationListener> listeners = new CopyOnWriteArrayList<ModificationListener>();
+    private final List<Deliverable> deliverables = new CopyOnWriteArrayList<Deliverable>();
+    private static final Executor EXEC = Executors.newSingleThreadExecutor();
+    
+    PendingEventSupport() {
+    }
+
+    @Override
+    public void fireModificationEvent(ModificationEvent ev) {
+        synchronized (deliverables) {
+            final Deliverable d = new Deliverable(ev, listeners.toArray(new ModificationListener[0]));
+            deliverables.add(d);
+            EXEC.execute(this);
+        }
+    }
+
+    @Override
+    public void add(ModificationListener l) {
+        listeners.add(l);
+    }
+
+    @Override
+    public void remove(ModificationListener l) {
+        listeners.remove(l);
+    }
+
+    @Override
+    public void run() {
+        Deliverable[] pending;
+        synchronized (deliverables) {
+            if (deliverables.isEmpty()) {
+                return;
+            }
+            pending = deliverables.toArray(new Deliverable[0]);
+            deliverables.clear();
+        }
+        int pendingCount = pending.length;
+        for (Deliverable d : pending) {
+            d.ev.pending = --pendingCount;
+            for (ModificationListener l : d.listeners) {
+                l.modification(d.ev);
+            }
+        }
+    }
+    
+    private static class Deliverable {
+        final ModificationEvent ev;
+        final ModificationListener[] listeners;
+
+        public Deliverable(ModificationEvent ev, ModificationListener[] listeners) {
+            this.ev = ev;
+            this.listeners = listeners;
+        }
+    }
+}