source: sample/pingpong/PingPong.cpp

#include "PingPong.h"
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

using namespace ariba;

namespace ariba {
namespace application {
namespace pingpong {

// logging
use_logging_cpp( PingPong );

// the service that the pingpong wants to use
ServiceID PingPong::PINGPONG_SERVICEID = ServiceID( 111 );

// construction
PingPong::PingPong( string config)  :
        node(),
        counter( 0 ),
        pingId( 0 ),
        config_file(config)
{
        Timer::setInterval( 5000 );
}

// destruction
PingPong::~PingPong() {
}

// implementation of the startup interface
void PingPong::startup()
{
    using boost::property_tree::ptree;
    using boost::property_tree::json_parser::read_json;
    
        // set up logging
        logging_rootlevel_debug();
        logging_classlevel_debug(PingPong);

        logging_info( "[PINGPONG]\t starting up PingPong service ... " );

    // read config
    ptree config;
    try
    {
        read_json(config_file, config);
    }
    catch ( exception& e )
    {
        logging_warn("ERROR: Failed to read config file »" << config_file << "«: ");
        logging_warn(e.what());
        logging_warn("---> Using fallback config.");
        
        config.put("ariba.spovnet_name", "pingpong");
    }
    
    // use node name also in the application
    name = config.get("ariba.node_name", "NO_NAME");
    
        // bind communication and node listener
        node.bind( this );                              /*NodeListener*/
        node.bind( this, PingPong::PINGPONG_SERVICEID); /*CommunicationListener*/

    // connecting
    logging_debug( "connecting ... " );

        node.connect(config.get_child("ariba"));

        // ping pong started up...
        logging_info( "[PINGPONG]\t pingpong starting up with"
                        << " [spovnetid " << node.getSpoVNetId().toString() << "]"
                        << " and [nodeid " << node.getNodeId().toString() << "]" );
}

// implementation of the startup interface
void PingPong::shutdown() {

        logging_info( "[PINGPONG]\t pingpong service starting shutdown sequence ..." );

        // stop timer
        Timer::stop();

        // leave spovnet
        node.leave();

        // unbind communication and node listener
        node.unbind( this );                               /*NodeListener*/
        node.unbind( this, PingPong::PINGPONG_SERVICEID ); /*CommunicationListener*/

        // now we are completely shut down
        logging_info( "pingpong service shut down" );
}

// timer event
void PingPong::eventFunction()
{
        // We ping all nodes that are known in the overlay structure
        // this can be all nodes (OneHop) overlay or just some neighbors
        // in case of a Chord or Kademlia structure
        // NOTE: Currently ariba only supports the Chord overlay.

        // In this sample we use auto-links: we just send out our message
        // to the node and the link is established automatically. for more
        // control we would use the node->establishLink function to create
        // a link and start using the link in the CommunicationListener::onLinkUp
        // function that is implemented further down in PingPong::onLinkUp
        
        // NOTE: This example still uses the old deprecated ariba::message messages 
        //   with the ariba built-in serialization. 
        // For future applications please use the new reboost::message_t messages. 
        //   Data is stored in high efficient zero-copy buffers of type 
        //   reboost::shared_buffer_t. These buffers hold plain data, so you have to 
        //   serialize the data "on your own".
        // We recommend third-party serialization libraries like:
        //   - Protocol Buffers (http://en.wikipedia.org/wiki/Protocol_Buffers)
        //   - MessagePack      (http://en.wikipedia.org/wiki/MessagePack)

        
        // don't do anything if we have no neighbors
        if ( node.getNeighborNodes().size() == 0)
    {
        logging_info( "[PINGPONG]\t +++ no neighbors +++" );
        return;
    }
    
    
        pingId++;
    logging_info( "\n|||||||||| >>>>>>>>>>\n"
                << "[PINGPONG]\t PINGING overlay neighbors with ping id " << pingId );
        PingPongMessage pingmsg( pingId, name );
        
        //-----------------------------------------------------------------------
        // Option 1: get all neighboring nodes and send the message to each
        //-----------------------------------------------------------------------
        counter++;
        if (counter<0 || counter>4) {
                counter = 0;
                string s;
                for (int i=0; i<names.size();i++) {
                        if (i!=0) s+= ", ";
                        s = s+names[i];
                }
                logging_info("[PINGPONG]\t ----> I am " << name << " and I know " << s);
                names.clear();
        }

        vector<NodeID> nodes = node.getNeighborNodes();
        BOOST_FOREACH( NodeID nid, nodes ){
                logging_info( "[PINGPONG]\t sending ping message to " << nid.toString() );
                node.sendMessage( pingmsg, nid, PingPong::PINGPONG_SERVICEID );
        }

        //-----------------------------------------------------------------------
        // Option 2: send a "broadcast message" that actually does the same thing
        //           internally, gets all neighboring nodes and sends the message
        //-----------------------------------------------------------------------
        // node->sendBroadcastMessage( pingmsg, PingPong::PINGPONG_SERVICEID );
}

void PingPong::onJoinCompleted( const SpoVNetID& vid ) {
        logging_info( "pingpong node join completed, spovnetid=" << vid.toString() );

        // start the timer to ping every second
        Timer::start();
}

void PingPong::onJoinFailed( const SpoVNetID& vid ) {
        logging_error("pingpong node join failed, spovnetid=" << vid.toString() );
}

void PingPong::onLeaveCompleted( const SpoVNetID& vid ){
        logging_info("pingpong node leave completed, spovnetid=" << vid.toString() );
}

void PingPong::onLeaveFailed( const SpoVNetID& vid ){
        logging_error("pingpong node leave failed, spovnetid=" << vid.toString() );
}

void PingPong::onMessage(const DataMessage& msg, const NodeID& remote, const LinkID& lnk) {
        PingPongMessage* pingmsg = msg.getMessage()->convert<PingPongMessage> ();
        bool found=false;
        for (int i=0;i<names.size(); i++) if (names[i]==pingmsg->getName()) found=true;
        if (!found) names.push_back(pingmsg->getName());
        logging_info( "\n<<<<<<<<<< ||||||||||\n"
                << "[PINGPONG]\t RECEIVED ping message on link "
                << lnk.toString()
                << " " << (node.isLinkDirect(lnk) ? "[DIRECT-LINK]" : "[INDIRECT-LINK]")
                << " HopCount: " << node.getHopCount(lnk)
                        << " from node " << remote.toString()
                        << " (" << pingmsg->getName() << ")"
                        << ": " << pingmsg->info() );
        delete pingmsg;
}

void PingPong::onLinkUp(const LinkID& lnk, const NodeID& remote){
        logging_info( "received link-up event for link " << lnk.toString()
                        << " and node " << remote.toString() );
}

void PingPong::onLinkDown(const LinkID& lnk, const NodeID& remote){
        logging_info( "received link-down event for link " << lnk.toString()
                        << " and node " << remote.toString() );
}

void PingPong::onLinkChanged(const LinkID& lnk, const NodeID& remote){
        logging_info( "link-changed event for link " << lnk.toString()
                        << " and node " << remote.toString() );
}

bool PingPong::onLinkRequest(const NodeID& remote) {
        logging_info( "node " << remote.toString() << " wants to build up a link with us ... allowing" );
        return true;
}

void PingPong::onLinkFail(const LinkID& lnk, const NodeID& remote){
        logging_info( "received link-failed event for link " << lnk.toString()
                        << " and node " << remote.toString() );
}

}}} // namespace ariba, application, pingpong