Examples of org.jgroups.util.Buffer

org.jgroups.util.Buffer
Buffer with an offset and length. Will be replaced with NIO equivalent once JDK 1.4 becomes baseline. This class is immutable. Note that the underlying byte[] buffer must not be changed as long as this Buffer instance is in use ! @author Bela Ban

         if (recipient != null) msg.setDest(recipient);
         return msg;
      }


      private Buffer marshallCall() {
         Buffer buf;
         try {
            buf = req_marshaller.objectToBuffer(command);
         } catch (Exception e) {
            throw new RuntimeException("Failure to marshal argument(s)", e);
         }

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         // Replay capability requires responses from all members!
         ResponseMode mode = supportReplay ? ResponseMode.GET_ALL : this.mode;


         RspList<Object> retval = null;
         Buffer buf;
         if (broadcast || FORCE_MCAST) {
            RequestOptions opts = new RequestOptions();
            opts.setMode(mode);
            opts.setTimeout(timeout);
            opts.setRspFilter(filter);

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         this.filter = filter;
         this.supportReplay = supportReplay;
      }


      public RspList call() throws Exception {
         Buffer buf;
         try {
            buf = req_marshaller.objectToBuffer(command);
         }
         catch (Exception e) {
            throw new RuntimeException("Failure to marshal argument(s)", e);

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            }
            help();
            return;
        }


        Buffer buf;
        List<Message> list=new LinkedList<Message>();
        long start=System.currentTimeMillis();
        long stop;
        for(int i=0; i < num; i++) {
            Message m=new Message(new IpAddress(addr, 5555), new IpAddress(addr, 6666), new byte[256]);
            if(add_headers)
                addHeaders(m);
            list.add(m);
        }


        start=System.currentTimeMillis();
        buf=Util.msgListToByteBuffer(list);
        stop=System.currentTimeMillis();
        System.out.println("Marshalling a message list of " + list.size() + " elements took " + (stop - start) + "ms.");


        start=System.currentTimeMillis();
        List<Message> list2=Util.byteBufferToMessageList(buf.getBuf(), buf.getOffset(), buf.getLength());
        stop=System.currentTimeMillis();
        System.out.println("Unmarshalling a message list of " + list2.size() + " elements took " + (stop - start) + "ms.");
    }

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        ExposedByteArrayOutputStream out_stream=new ExposedByteArrayOutputStream((int)(msg.size() + 50));
        ExposedDataOutputStream dos=new ExposedDataOutputStream(out_stream);


        writeMessage(msg, dos, multicast);
        Buffer buf=new Buffer(out_stream.getRawBuffer(), 0, out_stream.size());


        if(stats) {
            num_msgs_sent++;
            num_bytes_sent+=buf.getLength();
        }
        List<RouterStub> stubs = stubManager.getStubs();
        if(multicast) {
            tunnel_policy.sendToAllMembers(stubs, group, buf.getBuf(), buf.getOffset(), buf.getLength());
        }
        else {
            tunnel_policy.sendToSingleMember(stubs, group, dest, buf.getBuf(), buf.getOffset(), buf.getLength());
        }
    }

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            try (Marshaller marshaller = this.context.createMarshaller(version)) {
                marshaller.start(Marshalling.createByteOutput(output));
                marshaller.writeObject(object);
                marshaller.flush();
            }
            return new Buffer(output.toByteArray());
        }
    }

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        receiver=null;
        super.stop();
    }


    void sendMcastDiscoveryRequest(Message msg) {
        Buffer           buf;
        DatagramPacket   packet;
        DataOutputStream out=null;


        try {
            if(msg.getSrc() == null)
                msg.setSrc(local_addr);
            ExposedByteArrayOutputStream out_stream=new ExposedByteArrayOutputStream(128);
            out=new DataOutputStream(out_stream);
            msg.writeTo(out);
            out.flush(); // flushes contents to out_stream
            buf=new Buffer(out_stream.getRawBuffer(), 0, out_stream.size());
            packet=new DatagramPacket(buf.getBuf(), buf.getOffset(), buf.getLength(), mcast_addr, mcast_port);
            discovery_reception.reset();
            if(mcast_send_sockets != null) {
                MulticastSocket s;
                for(int i=0; i < mcast_send_sockets.length; i++) {
                    s=mcast_send_sockets[i];

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        ExposedByteArrayOutputStream out_stream=new ExposedByteArrayOutputStream((int)(msg.size() + 50));
        ExposedDataOutputStream dos=new ExposedDataOutputStream(out_stream);


        writeMessage(msg, dos, multicast);
        Buffer buf=new Buffer(out_stream.getRawBuffer(), 0, out_stream.size());


        if(stats) {
            num_msgs_sent++;
            num_bytes_sent+=buf.getLength();
        }
        List<RouterStub> stubs = stubManager.getStubs();
        if(multicast) {
            tunnel_policy.sendToAllMembers(stubs, group, buf.getBuf(), buf.getOffset(), buf.getLength());
        }
        else {
            tunnel_policy.sendToSingleMember(stubs, group, dest, buf.getBuf(), buf.getOffset(), buf.getLength());
        }
    }

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                msg.setSrc(local_addr);
            ExposedByteArrayOutputStream out_stream=new ExposedByteArrayOutputStream(128);
            out=new DataOutputStream(out_stream);
            msg.writeTo(out);
            out.flush(); // flushes contents to out_stream
            Buffer buf=new Buffer(out_stream.getRawBuffer(), 0, out_stream.size());


            discovery_reception.reset();
            for(int i=bind_port; i < bind_port+port_range; i++) {
                DatagramPacket packet=new DatagramPacket(buf.getBuf(), buf.getOffset(), buf.getLength(), dest_addr, i);
                sock.send(packet);
            }
            
            waitForDiscoveryRequestReception();
        }

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            DataOutputStream out=new DataOutputStream(out_stream);
            try {
                if(obj == null) {
                    out_stream.write(NULL);
                    out_stream.flush();
                    return new Buffer(out_stream.toByteArray());
                }
                if(obj instanceof MethodCall) {
                    out.writeByte(METHOD_CALL);
                    MethodCall call=(MethodCall)obj;
                    out.writeShort(call.getId());
                    Object[] args=call.getArgs();
                    if(args == null || args.length == 0) {
                        out.writeShort(0);
                    }
                    else {
                        out.writeShort(args.length);
                        for(int i=0; i < args.length; i++) {
                            Util.objectToStream(args[i], out);
                        }
                    }
                }
                else if(obj instanceof Cache.Value) {
                    Cache.Value value=(Cache.Value)obj;
                    out.writeByte(VALUE);
                    out.writeLong(value.getTimeout());
                    Util.objectToStream(value.getValue(), out);
                }
                else {
                    out.writeByte(OBJ);
                    Util.objectToStream(obj, out);
                }
                out.flush();
                return new Buffer(out_stream.toByteArray());
            }
            finally {
                Util.close(out);
            }
        }

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