undefect. CWE-407 — 63 sites patched across 27 ecosystems

Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.

test/jdk/javax/management/timer/MissingNotificationTest.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2008, 2015, 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.
+ */
+
+/*
+ * @test
+ * @bug 6809322
+ * @key randomness
+ * @summary Test for missing notifications in a high concurrency environment
+ * @author Jaroslav Bachorik
+ *
+ * @run clean MissingNotificationTest
+ * @run build MissingNotificationTest
+ * @run main MissingNotificationTest
+ */
+
+import java.util.Date;
+import java.util.Random;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import javax.management.timer.Timer;
+import javax.management.Notification;
+import javax.management.NotificationListener;
+
+public class MissingNotificationTest {
+    private static int TASK_COUNT = 10000;
+    private static long fixedDelay = 0;// anything bigger than 100 and no alarms remain unfired
+
+    private static class NotifListener implements NotificationListener {
+
+        int count;
+
+        public synchronized void handleNotification(Notification notification, Object handback) {
+            count++;
+        }
+
+        synchronized int getCount() {
+            return count;
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        System.out.println(
+            ">>> Test for missing notifications.");
+
+        System.out.println(">>> Create a Timer object.");
+        final Timer timer = new Timer();
+
+        timer.start();
+
+        NotifListener listener = new NotifListener();
+        timer.addNotificationListener(listener, null, null);
+
+        ExecutorService executor = Executors.newFixedThreadPool(100);
+        final Random rand = new Random();
+
+
+        for (int i = 0; i < TASK_COUNT; i++) {
+            executor.execute(new Runnable() {
+                public void run() {
+                    long dateMillis = System.currentTimeMillis() + fixedDelay + rand.nextInt(2000);
+                    Date date = new Date(dateMillis);
+                    timer.addNotification("type", "msg", "userData", date);
+                }
+            });
+
+        }
+
+        executor.shutdown();
+        executor.awaitTermination(20, TimeUnit.SECONDS);
+
+        waitForNotificationsToEnd(listener);
+
+        timer.stop();
+
+        if (listener.count < TASK_COUNT) {
+            throw new RuntimeException("Not fired: " + (TASK_COUNT - listener.count));
+        } else {
+            System.out.println(">>> All notifications handled OK");
+        }
+
+        System.out.println(">>> Bye bye!");
+    }
+
+    /**
+     * Will return when all notifications are handled or after 10sec. of no new
+     * notifications
+     *
+     * @param listener
+     * @throws InterruptedException
+     */
+    private static void waitForNotificationsToEnd(NotifListener listener)
+            throws InterruptedException {
+        int oldCout = listener.getCount();
+        int noChangeCounter = 1;
+        while (listener.getCount() < TASK_COUNT) {
+            Thread.sleep(1000);
+            System.out.print('.');
+            if (oldCout == listener.getCount())//no change
+            {
+                if (++noChangeCounter > 10) {
+                    break;
+                }
+            } else {
+                noChangeCounter = 1;
+            }
+
+            oldCout = listener.getCount();
+        }
+        System.out.println();
+    }
+}