Use WebSocket to help applications cluster inter-node communication

In a standard cluster scenario, the node is sent through a packet to the well-agreed multicast IP address: port, which establishes the communication. Use a TCP plug, for example.

"Simulating a clustered scene with a servlet"

"1. Connect the @serverendpoint"

"What the nodes do."

Ws://localhost:8080/cluster/clusternodesocket/clusternode1/query
Uri uri = new uri ("ws", "localhost:8080", path, NULL, NULL);

Connect the WebSocket
This.session = Containerprovider.getwebsocketcontainer ()
        . Connecttoserver (this, URI);

"What the server does."

2      Public voidOnOpen (Session session, @PathParam ("NodeId") String nodeId)3     {8Clustermessage message =NewClustermessage (NodeId, "Joined the cluster."); One             //notifies all nodes that there is a new node join because this is happening in OnOpen, that is, a proxy on the terminal connection. A         byte[] bytes =clusternodeendpoint.tobytearray (message); -          for(Session node:ClusterNodeEndpoint.nodes) -                 //Send Bytebuffer the node.getbasicremote (). Sendbinary (Bytebuffer.wrap (bytes)); A ClusterNodeEndpoint.nodes.add (session); at}

"2.Servlet is responsible for routing requests and receiving messages, and the server is responsible for passing messages to other nodes"

"Node processing GET Request"

2     protected voiddoget (httpservletrequest request, httpservletresponse response)3             throwsservletexception, IOException4     {6         //constructs a message to be sent to the node7Clustermessage message =NewClustermessage ( This. NodeId,8"Request:{ip:\" "+ request.getremoteaddr () +9"\", querystring:\ "" + request.getquerystring () + "\"} ");Ten  One         //using the serialization mechanism to send messages A         Try(OutputStream output = This. Session.getbasicremote (). Getsendstream (); -ObjectOutputStream stream =NewObjectOutputStream (output)) -         { the stream.writeobject (message); -         } -Response.getwriter (). Append ("OK"); -}

"Node receives message"

1 @OnMessage2      Public voidonMessage (InputStream input)3     {4         Try(ObjectInputStream stream =NewObjectInputStream (input))5         {6Clustermessage message =(Clustermessage) stream.readobject ();7System.out.println ("INFO Node" + This. NodeId +8"): Message received from cluster; node = "+9Message.getnodeid () + ", message =" +message.getmessage ());Ten         } One         Catch(IOException |classnotfoundexception e) A         { - e.printstacktrace (); -         } the}

"Server passes to other node messages"

1 @OnMessage2      Public voidOnMessage (Session session,byte[] message)3     {4         Try5         {6              for(Session node:ClusterNodeEndpoint.nodes)7             {8                 //send messages to other nodes (messages from the current node)9                 if(Node! =session) One node.getbasicremote (). Sendbinary (bytebuffer.wrap (message)); A             } -         } -         Catch(IOException e) the         { -System.err.println ("error:exception when handling message on server"); - e.printstacktrace (); -         } +}

Use WebSocket to help applications cluster inter-node communication