差異處
這裏顯示兩個版本的差異處。
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java:web:wicket:websocket_disconn_handling [2018/11/02 22:22] tony [Handle On Server Side] |
java:web:wicket:websocket_disconn_handling [2023/06/25 09:48] |
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| - | {{tag>wicket websocket}} | ||
| - | ====== Wicket - Websocket disconnection handling ====== | ||
| - | ===== Problem ===== | ||
| - | 造成websocket突然斷線的原因很多，像是網路不穩定或是閒置過久遭server或是browser中斷連線等，都有可能導致接下來的工作不正常。因此我們需要方法去處理連線中斷的情況。 | ||
| - | ===== How to? ===== | ||
| - | 我們Web框架使用Apache Wicket(6.22)，而Server是Jetty(9.3.9)。 | ||
| - | ==== Handle On Server Side ==== | ||
| - | 我們最早版本是在Server Side根據user request做處理，假如user request對應的websocket連線已中斷，那我們就會透過AjaxRequestTarget送一個reload給client: | ||
| - | <code java> | ||
| - | public class WebSocketCheckListener extends AbstractRequestCycleListener { | ||
| - | |||
| - | @Override | ||
| - | public void onRequestHandlerScheduled(RequestCycle cycle, IRequestHandler handler) { | ||
| - | if (!(handler instanceof AjaxRequestTarget)) | ||
| - | return; | ||
| - | AjaxRequestTarget target = (AjaxRequestTarget) handler; | ||
| - | Page page = target.getPage(); | ||
| - | |||
| - | Application application = Application.get(); | ||
| - | |||
| - | IWebSocketSettings webSocketSettings = IWebSocketSettings.Holder.get(application); | ||
| - | IWebSocketConnectionRegistry webSocketConnectionRegistry = webSocketSettings.getConnectionRegistry(); | ||
| - | |||
| - | IKey key = new PageIdKey(page.getPageId()); | ||
| - | IWebSocketConnection conn = webSocketConnectionRegistry.getConnection(application, page.getSession().getId(), key); | ||
| - | |||
| - | if (conn == null || !conn.isOpen()) { | ||
| - | target.appendJavaScript("location.reload()"); | ||
| - | } | ||
| - | } | ||
| - | } | ||
| - | </code> | ||
| - | 這做法不是不好，只是有點繞。假如連線問題是client可以得知的，是不是交由client去處理就好了呢? | ||
| - | ==== Handle On Client Side ==== | ||
