ActiveBlaze supports group membership using a GroupChannel - which can be created from a GroupChannelFactory.
You have to explicitly say which group you want to join/leave - and you can join multiple groups.
Each GroupChannel has both a globally unique id and a name.


BlazeGroupChannelFactory factory = new BlazeGroupChannelFactory();

BlazeGroupChannel channel = factory.createGroupChannel("My Channel");
//join a group

//listen for other members

channel.addMemberChangedListener(new MemberChangedListener(){

     public void memberStarted(Member member) {
         System.out.println("Member started");

     public void memberStopped(Member member) {
         System.out.println("Member stopped");
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