1 files changed, 86 insertions, 0 deletions
diff --git a/awt/org/apache/harmony/awt/wtk/ShutdownWatchdog.java b/awt/org/apache/harmony/awt/wtk/ShutdownWatchdog.java
new file mode 100644
index 0000000..6efa519
--- /dev/null
+++ b/awt/org/apache/harmony/awt/wtk/ShutdownWatchdog.java
@@ -0,0 +1,86 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+/** 
+ * @author Pavel Dolgov
+ * @version $Revision$
+ */
+package org.apache.harmony.awt.wtk;
+
+/**
+ * Shutdown Watchdog
+ */
+public final class ShutdownWatchdog {
+    
+    private boolean nativeQueueEmpty = true;
+    private boolean awtQueueEmpty = true;
+    private boolean windowListEmpty = true;
+
+    private boolean forcedShutdown = false;
+    
+    private ShutdownThread thread;
+
+    public synchronized void setNativeQueueEmpty(boolean empty) {
+        nativeQueueEmpty = empty;
+        checkShutdown();
+    }
+
+    public synchronized void setAwtQueueEmpty(boolean empty) {
+        awtQueueEmpty = empty;
+        checkShutdown();
+    }
+
+    public synchronized void setWindowListEmpty(boolean empty) {
+        windowListEmpty = empty;
+        checkShutdown();
+    }
+    
+    public synchronized void forceShutdown() {
+        forcedShutdown = true;
+        shutdown();
+    }
+    
+    public synchronized void start() {
+        keepAlive();
+    }
+
+    private void checkShutdown() {
+        if (canShutdown()) {
+            shutdown();
+        } else {
+            keepAlive();
+        }
+    }
+
+    private boolean canShutdown() {
+        return (nativeQueueEmpty && awtQueueEmpty && windowListEmpty) ||
+                forcedShutdown;
+    }
+
+    private void keepAlive() {
+        if (thread == null) {
+            thread = new ShutdownThread();
+            thread.start();
+        }
+    }
+
+    private void shutdown() {
+        if (thread != null) {
+            thread.shutdown();
+            thread = null;
+        }
+    }
+}