| /* |
| * 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; |
| } |
| } |
| } |