Issue #3835 - add default methods to WebSocketSessionListener

Signed-off-by: Lachlan Roberts <lachlan@webtide.com>

jetty-websocket/javax-websocket-client-impl/src/main/java/org/eclipse/jetty/websocket/jsr356/ClientContainer.java

@@ -524,11 +524,6 @@ public class ClientContainer extends ContainerLifeCycle implements WebSocketCont
             this.listener = listener;
         }
 
-        @Override
-        public void onSessionCreated(WebSocketSession session)
-        {
-        }
-
         @Override
         public void onSessionOpened(WebSocketSession session)
         {

jetty-websocket/javax-websocket-server-impl/src/test/java/org/eclipse/jetty/websocket/jsr356/server/SessionTrackingTest.java

@@ -96,11 +96,6 @@ public class SessionTrackingTest
             CountDownLatch closedLatch = new CountDownLatch(2);
             wsServerFactory.addSessionListener(new WebSocketSessionListener()
             {
-                @Override
-                public void onSessionCreated(WebSocketSession session)
-                {
-                }
-
                 @Override
                 public void onSessionOpened(WebSocketSession session)
                 {

jetty-websocket/jetty-websocket-tests/src/test/java/org/eclipse/jetty/websocket/tests/ConcurrentConnectTest.java

@@ -147,16 +147,6 @@ public class ConcurrentConnectTest
     {
         public CountDownLatch closeLatch = new CountDownLatch(MAX_CONNECTIONS);
 
-        @Override
-        public void onSessionCreated(WebSocketSession session)
-        {
-        }
-
-        @Override
-        public void onSessionOpened(WebSocketSession session)
-        {
-        }
-
         @Override
         public void onSessionClosed(WebSocketSession session)
         {

jetty-websocket/jetty-websocket-tests/src/test/java/org/eclipse/jetty/websocket/tests/client/BadNetworkTest.java

@@ -139,11 +139,6 @@ public class BadNetworkTest
         WebSocketServerFactory wssf = (WebSocketServerFactory)context.getServletContext().getAttribute(WebSocketServletFactory.class.getName());
         wssf.addSessionListener(new WebSocketSessionListener()
         {
-            @Override
-            public void onSessionCreated(WebSocketSession session)
-            {
-            }
-
             @Override
             public void onSessionOpened(WebSocketSession session)
             {

jetty-websocket/jetty-websocket-tests/src/test/java/org/eclipse/jetty/websocket/tests/client/ClientOpenSessionTracker.java

@@ -63,16 +63,6 @@ public class ClientOpenSessionTracker implements Connection.Listener, WebSocketS
         this.closeConnectionLatch.countDown();
     }
 
-    @Override
-    public void onSessionCreated(WebSocketSession session)
-    {
-    }
-
-    @Override
-    public void onSessionOpened(WebSocketSession session)
-    {
-    }
-
     @Override
     public void onSessionClosed(WebSocketSession session)
     {

jetty-websocket/jetty-websocket-tests/src/test/java/org/eclipse/jetty/websocket/tests/client/ClientSessionsTest.java

@@ -102,16 +102,6 @@ public class ClientSessionsTest
 
         client.addSessionListener(new WebSocketSessionListener()
         {
-            @Override
-            public void onSessionCreated(WebSocketSession session)
-            {
-            }
-
-            @Override
-            public void onSessionOpened(WebSocketSession session)
-            {
-            }
-
             @Override
             public void onSessionClosed(WebSocketSession session)
             {

jetty-websocket/websocket-common/src/main/java/org/eclipse/jetty/websocket/common/SessionTracker.java

@@ -43,12 +43,6 @@ public class SessionTracker extends AbstractLifeCycle implements WebSocketSessio
         sessions.add(session);
     }
 
-    @Override
-    public void onSessionOpened(WebSocketSession session)
-    {
-        // do nothing
-    }
-
     @Override
     public void onSessionClosed(WebSocketSession session)
     {

jetty-websocket/websocket-common/src/main/java/org/eclipse/jetty/websocket/common/WebSocketSessionListener.java

@@ -20,9 +20,15 @@ package org.eclipse.jetty.websocket.common;
 
 public interface WebSocketSessionListener
 {
-    void onSessionCreated(WebSocketSession session);
+    default void onSessionCreated(WebSocketSession session)
+    {
+    }
 
-    void onSessionOpened(WebSocketSession session);
+    default void onSessionOpened(WebSocketSession session)
+    {
+    }
 
-    void onSessionClosed(WebSocketSession session);
+    default void onSessionClosed(WebSocketSession session)
+    {
+    }
 }