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'use strict';
var NUM_WORKERS = 4;
var PACKETS_PER_WORKER = 10;
var assert = require('assert');
var cluster = require('cluster');
var common = require('../common');
var dgram = require('dgram');
if (process.platform === 'win32') {
console.warn('dgram clustering is currently not supported on windows.');
process.exit(0);
}
if (cluster.isMaster)
master();
else
worker();
function master() {
var listening = 0;
// Fork 4 workers.
for (var i = 0; i < NUM_WORKERS; i++)
cluster.fork();
// Wait until all workers are listening.
cluster.on('listening', function() {
if (++listening < NUM_WORKERS)
return;
// Start sending messages.
var buf = new Buffer('hello world');
var socket = dgram.createSocket('udp4');
var sent = 0;
doSend();
function doSend() {
socket.send(buf, 0, buf.length, common.PORT, '127.0.0.1', afterSend);
}
function afterSend() {
sent++;
if (sent < NUM_WORKERS * PACKETS_PER_WORKER) {
doSend();
} else {
console.log('master sent %d packets', sent);
socket.close();
}
}
});
// Set up event handlers for every worker. Each worker sends a message when
// it has received the expected number of packets. After that it disconnects.
for (var key in cluster.workers) {
if (cluster.workers.hasOwnProperty(key))
setupWorker(cluster.workers[key]);
}
function setupWorker(worker) {
var received = 0;
worker.on('message', function(msg) {
received = msg.received;
console.log('worker %d received %d packets', worker.id, received);
});
worker.on('disconnect', function() {
assert(received === PACKETS_PER_WORKER);
console.log('worker %d disconnected', worker.id);
});
}
}
function worker() {
var received = 0;
// Create udp socket and start listening.
var socket = dgram.createSocket('udp4');
socket.on('message', function(data, info) {
received++;
// Every 10 messages, notify the master.
if (received == PACKETS_PER_WORKER) {
process.send({received: received});
process.disconnect();
}
});
socket.bind(common.PORT);
}
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