8223108: Test java/awt/EventQueue/NonComponentSourcePost.java is unstable

Reviewed-by: prr

test/jdk/java/awt/EventQueue/NonComponentSourcePost.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 1999, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.awt.AWTEvent;
+import java.awt.ActiveEvent;
+import java.awt.EventQueue;
+import java.awt.Toolkit;
+import java.awt.event.ActionEvent;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * @test
+ * @bug 4137796
+ * @summary Checks that the posting of events whose sources are not Components
+ *          does not corrupt the EventQueue.
+ */
+public class NonComponentSourcePost {
+
+    public static final int COUNT = 100;
+    public static CountDownLatch go = new CountDownLatch(COUNT);
+
+    public static void main(String[] args) throws Throwable {
+        EventQueue q = new EventQueue();
+        for (int i = 0; i < COUNT; i++) {
+            q.postEvent(new NewActionEvent());
+        }
+        if (!go.await(30, TimeUnit.SECONDS)) {
+            throw new RuntimeException("Timeout");
+        }
+        AWTEvent event = q.peekEvent();
+        if (event != null) {
+            throw new Exception("Non null event: " + event);
+        }
+
+        if (NewActionEvent.result != NewActionEvent.sum) {
+            throw new Exception("result: " + NewActionEvent.result +
+                                "  sum: " + NewActionEvent.sum);
+        }
+        // Simple way to shutdown the AWT machinery
+        Toolkit.getDefaultToolkit().getSystemEventQueue().push(q);
+    }
+
+    static class NewActionEvent extends ActionEvent implements ActiveEvent {
+        static int counter = 1;
+        static int sum = 0;
+        static int result = 0;
+
+        int myval;
+
+        public NewActionEvent() {
+            super("", ACTION_PERFORMED, "" + counter);
+            myval = counter++;
+            sum += myval;
+        }
+
+        public synchronized void dispatch() {
+            result += myval;
+            try {
+                wait(100);
+            } catch (InterruptedException e) {
+            }
+            go.countDown();
+        }
+    }
+}