org.jgroups.tests.RpcDispatcherBlocking Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

There is a newer version: 33.0.2.Final

Show newest version


package org.jgroups.tests;

import org.jgroups.*;
import org.jgroups.blocks.Request;
import org.jgroups.blocks.RequestOptions;
import org.jgroups.blocks.ResponseMode;
import org.jgroups.blocks.RpcDispatcher;
import org.jgroups.util.RspList;
import org.jgroups.util.Util;




/**
 * Tests synchronous group RPCs. 2 main test cases:
 * 
 * Member crashes during invocation of sync group RPC: start 3 instances (A,
 * B,C), set the timeout to be 30 seconds. Then invoke a sync group RPC by A
 * (press 's' in A's window). A,B and C should receive the RPC. Now kill C.
 * After some time, A's method call should return and show A's and B's reply to
 * be valid, while showing C's response marked as suspected.
 * 
Member joins group during synchronous group RPC: start A and B with
 * timeout=30000. Invoke a sync group RPC on A. Start C. A and B should
 * not receive the view change before the group RPC has
 * returned with A's and B's results. Therefore A and B should not wait
 * for C's response, which would never be received because C never got the RPC
 * in the first place. This would block A forever.
 * 
 * 
 * @author bela Dec 19, 2002
 */
public class RpcDispatcherBlocking implements MembershipListener {
    RpcDispatcher disp;
    Channel       channel;
    long          timeout=30000;
    String        props=null;
    int           i=0;


    public RpcDispatcherBlocking(String props, long timeout) {
        this.props=props; this.timeout=timeout;
    }


    public void print(int i) throws Exception {
        System.out.println("<-- " + i + " [sleeping for " + timeout + " msecs");
        Util.sleep(timeout);
    }


    public void viewAccepted(View new_view) {
        System.out.println("new view: " + new_view);
    }


    /** Called when a member is suspected */
    public void suspect(Address suspected_mbr) {
        System.out.println(suspected_mbr + " is suspected");
    }


    /** Block sending and receiving of messages until viewAccepted() is called */
    public void block() {
    }

    public void unblock() {
    }

    public void start() throws Exception {
        int     c;
        RspList rsps;

        channel=new JChannel(); // default props
        disp=new RpcDispatcher(channel, null, this, this);
        channel.connect("rpc-test");
        
        while(true) {
            System.out.println("[x]: exit [s]: send sync group RPC");
            System.out.flush();
            c=System.in.read();
            switch(c) {
                case 'x':
                    channel.close();
                    disp.stop();
                return;
            case 's':
                rsps=sendGroupRpc();
                System.out.println("responses:\n" + rsps);
                break;
            }
            
            System.in.skip(System.in.available());
        }
    }


    RspList sendGroupRpc() throws Exception {
        return disp.callRemoteMethods(null, "print", new Object[]{new Integer(i++)}, new Class[] {int.class},
                                      new RequestOptions(ResponseMode.GET_ALL, 0));
    }


    public static void main(String[] args) {
        long   timeout=30000;
        String props=null;

        for(int i=0; i < args.length; i++) {
            if("-props".equals(args[i])) {
                props=args[++i];
                continue;
            }
            if("-timeout".equals(args[i])) {
                timeout=Long.parseLong(args[++i]);
                continue;
            }
            help();
            return;
        }
        


        try {
            new RpcDispatcherBlocking(props, timeout).start();
        }
        catch(Exception ex) {
            System.err.println(ex);
        }
    }


    static void help() {
        System.out.println("RpcDispatcherBlocking [-help] [-props ] [-timeout ]");
    }
}