JFace ISafeRunnable 例子

源码解析：PropertyNotifier类实现细节

最新推荐文章于 2025-11-22 20:03:07 发布

原创最新推荐文章于 2025-11-22 20:03:07 发布 · 179 阅读

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本文详细解析了PropertyNotifier类的实现原理，包括内部成员变量、方法及异常处理机制，帮助开发者理解如何通知监听者属性变化。

摘抄部分例子源码

/**
	 * Notifies listeners of property changes, handling any exceptions
	 */
	class PropertyNotifier implements ISafeRunnable {　//AbstractConsole.PropertyNotifier
		
		private IPropertyChangeListener fListener;
		private PropertyChangeEvent fEvent;
		
		/**
		 * @see org.eclipse.core.runtime.ISafeRunnable#handleException(java.lang.Throwable)
		 */
		public void handleException(Throwable exception) {
			IStatus status = new Status(IStatus.ERROR, ConsolePlugin.getUniqueIdentifier(), IConsoleConstants.INTERNAL_ERROR, ConsoleMessages.AbstractConsole_0, exception); 
			ConsolePlugin.log(status);  //调用框架日志
		}

		/**
		 * @see org.eclipse.core.runtime.ISafeRunnable#run()
		 */
		public void run() throws Exception {
			fListener.propertyChange(fEvent);
		}

		/**
		 * Notifies listeners of the property change
		 * 
		 * @param event the event that describes the property that has changed
		 */
		public void notify(PropertyChangeEvent event) {
			if (fListeners == null) {
				return;
			}
			fEvent = event;
			Object[] copiedListeners= fListeners.getListeners();
			for (int i= 0; i < copiedListeners.length; i++) {
				fListener = (IPropertyChangeListener)copiedListeners[i];
                SafeRunner.run(this);  //SafeRunner类捕获处理,handleException()定义处理异常方式
			}	
			fListener = null;			
		}
	}