package org.jgroups.demos;
import org.jgroups.*;
import org.jgroups.blocks.MethodCall;
import org.jgroups.blocks.Request;
import org.jgroups.blocks.RequestOptions;
import org.jgroups.blocks.RpcDispatcher;
import org.jgroups.util.Rsp;
import org.jgroups.util.RspList;
import org.jgroups.util.Util;
/** Demos RELAY. Create 2 *separate* clusters with RELAY as top protocol. Each RELAY has bridge_props="tcp.xml" (tcp.xml
* needs to be present). Then start 2 instances in the first cluster and 2 instances in the second cluster. They should
* find each other, and typing in a window should send the text to everyone, plus we should get 4 responses.
* @author Bela Ban
*/
public class RelayDemoRpc extends ReceiverAdapter {
protected JChannel ch;
protected RpcDispatcher disp;
protected Address local_addr;
protected View view;
public static void main(String[] args) throws Exception {
String props="udp.xml";
String name=null;
for(int i=0; i < args.length; i++) {
if(args[i].equals("-props")) {
props=args[++i];
continue;
}
if(args[i].equals("-name")) {
name=args[++i];
continue;
}
System.out.println("RelayDemo [-props props] [-name name]");
return;
}
RelayDemoRpc demo=new RelayDemoRpc();
demo.start(props, name);
}
public void start(String props, String name) throws Exception {
ch=new JChannel(props);
if(name != null)
ch.setName(name);
disp=new RpcDispatcher(ch, null, this, this);
ch.connect("RelayDemo");
local_addr=ch.getAddress();
MethodCall call=new MethodCall(getClass().getMethod("handleMessage", String.class, Address.class));
for(;;) {
String line=Util.readStringFromStdin(": ");
call.setArgs(new Object[]{line, local_addr});
if(line.equalsIgnoreCase("unicast")) {
for(Address dest: view.getMembers()) {
System.out.println("invoking method in " + dest + ": ");
try {
Object rsp=disp.callRemoteMethod(dest, call, new RequestOptions(Request.GET_ALL, 5000));
System.out.println("rsp from " + dest + ": " + rsp);
}
catch(Throwable throwable) {
throwable.printStackTrace();
}
}
continue;
}
RspList rsps=disp.callRemoteMethods(null, call, new RequestOptions(Request.GET_ALL, 5000).setAnycasting(true));
for(Rsp rsp: rsps.values())
System.out.println("<< " + rsp.getValue() + " from " + rsp.getSender());
}
}
public static String handleMessage(String msg, Address sender) {
System.out.println("<< " + msg + " from " + sender);
return "this is a response";
}
public void viewAccepted(View new_view) {
System.out.println(print(new_view));
view=new_view;
}
static String print(View view) {
StringBuilder sb=new StringBuilder();
boolean first=true;
sb.append(view.getClass().getSimpleName() + ": ").append(view.getViewId()).append(": ");
for(Address mbr: view.getMembers()) {
if(first)
first=false;
else
sb.append(", ");
sb.append(mbr);
}
return sb.toString();
}
}