DUBBO-71 Graceful shutdown-半关闭状态 dubbo协议默认开启

git-svn-id: http://code.alibabatech.com/svn/dubbo/trunk@651 1a56cb94-b969-4eaa-88fa-be21384802f2

dubbo-rpc-default/src/main/java/com/alibaba/dubbo/rpc/protocol/dubbo/DubboProtocol.java

@@ -246,7 +246,9 @@ public class DubboProtocol extends AbstractProtocol {
         return exporter;
     }
     
-    private ExchangeServer getServer(URL url) {
+    private ExchangeServer getServer(URL url) {
+        //默认开启server关闭时发送readonly事件
+        url = url.addParameterIfAbsent(Constants.CHANNEL_READONLYEVENT_SENT_KEY, Boolean.TRUE.toString());
         String str = url.getParameter(Constants.SERVER_KEY, Constants.DEFAULT_REMOTING_SERVER);
 
         if (str != null && str.length() > 0 && ! ExtensionLoader.getExtensionLoader(Transporter.class).hasExtension(str))
@@ -323,7 +325,8 @@ public class DubboProtocol extends AbstractProtocol {
     /**
      * 创建新连接.
      */
-    private ExchangeClient initClient(URL url) {
+    private ExchangeClient initClient(URL url) {
+        
         // client type setting.
         String str = url.getParameter(Constants.CLIENT_KEY, url.getParameter(Constants.SERVER_KEY, Constants.DEFAULT_REMOTING_CLIENT));