Created
June 27, 2017 20:39
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Node 8 - Cluster Express server
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var cluster = require('cluster'); | |
const PORT = 3000; | |
if (cluster.isMaster) { | |
const numWorkers = require('os').cpus().length; | |
console.log(`Master cluster setting up ${numWorkers} workers...`); | |
workers = []; | |
for (let i = 0; i < numWorkers; i++) | |
workers[i] = cluster.fork(); | |
cluster.on('online', worker => { | |
console.log(`Worker ${worker.process.pid} is online`); | |
}); | |
cluster.on('exit', (worker, code, signal) => { | |
console.log(`Worker ${worker.process.pid} died with code ${code}`); | |
console.log('Starting a new worker'); | |
workers[workers.indexOf(worker)] = cluster.fork(); | |
}); | |
/* messages */ | |
cluster.on('message', (worker, message, handle) => { | |
console.log(`message from worker ${worker.process.pid}: ${message.message}`) | |
}); | |
setInterval(() => { | |
workers.forEach(worker => { | |
worker.send(`hello from master to process ${worker.process.pid}`); | |
}); | |
}, 10000); | |
} else { | |
const app = require('express')(); | |
app.all('/*', (req, res) => { | |
process.send({message: 'hello from worker'}); | |
res.json({process: process.pid, message: 'Hello'}).end(); | |
}) | |
app.listen(PORT, () => { | |
console.log(`api on port ${PORT}, pid ${process.pid}`) | |
}); | |
/* messages */ | |
process.on('message', message => { | |
console.log(`message from master: ${message}`); | |
}); | |
} |
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