src/java.base/share/classes/sun/nio/ch/DatagramChannelImpl.java

rev 57580 : [mq]: MulticastSocketAdaptor

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 2001, 2020, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 1583,1592 ****
--- 1583,1608 ----
              registry.remove(key);
          }
      }
  
      /**
+      * Finds an existing membership of a multicast group. Returns null if this
+      * channel's socket is not a member of the group.
+      *
+      * @apiNote This method is for use by the socket adaptor
+      */
+     MembershipKey findMembership(InetAddress group, NetworkInterface interf) {
+         synchronized (stateLock) {
+             if (registry != null) {
+                 return registry.checkMembership(group, interf, null);
+             } else {
+                 return null;
+             }
+         }
+     }
+ 
+     /**
       * Block datagrams from the given source.
       */
      void block(MembershipKeyImpl key, InetAddress source)
          throws IOException
      {