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Examples of sequential, concurrent and parallel requests in node.js
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| // CONCURRENT REQUESTS | |
| var http = require('http') | |
| function concurrentRequests(){ | |
| for (var i = 0; i < 5; i++) { | |
| var request = { | |
| hostname: 'httpbin.org', | |
| headers: {'request-id': i}, | |
| path: '/delay/.'+ Math.floor(Math.random() * (5 - 1 + 1)) + 1 | |
| } | |
| http.get(request, (res) => { | |
| var body = '' | |
| res.on('data', function (chunk) { | |
| body += chunk | |
| }) | |
| res.on('end', function () { | |
| console.log(JSON.parse(body).headers['Request-Id']) | |
| }) | |
| }).end() | |
| } | |
| } | |
| console.log("Running concurrent requests!") | |
| concurrentRequests() |
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| // PARALLEL REQUESTS | |
| var http = require('http') | |
| var cluster = require('cluster') | |
| function getResponse(i, cb){ | |
| var request = { | |
| hostname: 'httpbin.org', | |
| headers: {'request-id': i}, | |
| path: '/delay/.'+ Math.floor(Math.random() * (5 - 1 + 1)) + 1 | |
| } | |
| http.get(request, (res) => { | |
| var body = '' | |
| res.on('data', function (chunk) { | |
| body += chunk | |
| }) | |
| res.on('end', function () { | |
| cb(JSON.parse(body).headers['Request-Id']) | |
| }) | |
| }).end() | |
| } | |
| if(cluster.isMaster) { | |
| var numWorkers = require('os').cpus().length; | |
| for(var i = 0; i < 5; i++) { | |
| var worker = cluster.fork() | |
| worker.on('message', function(message) { | |
| console.log(message.data.result) | |
| }) | |
| } | |
| var count = 0 | |
| for(var wid in cluster.workers) { | |
| count++ | |
| if (count > 5) {return} | |
| cluster.workers[wid].send({ | |
| type: 'request', | |
| data: { | |
| number: count | |
| } | |
| }) | |
| } | |
| } else { | |
| process.on('message', function(message) { | |
| if(message.type === 'request') { | |
| getResponse(message.data.number, function(res){ | |
| process.send({ | |
| data: { | |
| result: res | |
| } | |
| }) | |
| process.exit(0) | |
| }) | |
| } | |
| }) | |
| } |
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| // SEQUENTIAL REQUESTS | |
| var http = require('http') | |
| function sequentialRequest(count){ | |
| if (count == undefined) {count = 0} | |
| count++ | |
| if (count > 5) {return} | |
| var request = { | |
| hostname: 'httpbin.org', | |
| headers: {'request-id': count}, | |
| path: '/delay/.'+ Math.floor(Math.random() * (5 - 1 + 1)) + 1 | |
| } | |
| http.get(request, (res) => { | |
| var body = '' | |
| res.on('data', function (chunk) { | |
| body += chunk | |
| }) | |
| res.on('end', function () { | |
| console.log(JSON.parse(body).headers['Request-Id']) | |
| sequentialRequest(count) | |
| }) | |
| }).end() | |
| } | |
| console.log("Running sequential requests!") | |
| sequentialRequest() | |
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