Downloaded 76 times
![Error tracking/recovery
var http = require('http');
var cache = {};
function curl(url, cb) {
if (cache[url])
return cb(null, cache[url]);
var data = '';
http.get(url, function(res) {
res.setEncoding('utf8');
res.on('data', function(s) {
data += s;
});
res.on('end', function() {
cache[url] = data;
cb(null, data);
});
res.on('error', function(err) {
cb(err);
});
});
}
// Usage:
curl('http://www.google.com', console.log); 21](https://image.slidesharecdn.com/strongloopoverview-141006135845-conversion-gate02/85/StrongLoop-Overview-21-320.jpg)
![Error tracking/recovery
var http = require('http');
var cache = {};
function curl(url, cb) {
if (cache[url])
// WRONG: Synchronous callback
return cb(null, cache[url]);
var data = '';
http.get(url, function(res) {
res.setEncoding('utf8');
res.on('data', function(s) {
data += s;
});
res.on('end', function() {
cache[url] = data;
cb(null, data);
});
// WRONG: are you sure that 'end' and 'error' are mutually exclusive?
res.on('error', function(err) {
cb(err);
});
});
// WRONG: the request object may emit 'error'
}
22](https://image.slidesharecdn.com/strongloopoverview-141006135845-conversion-gate02/85/StrongLoop-Overview-22-320.jpg)
Uploaded byShubhra Kar
StrongLoop Overview
The document discusses the advantages of using Node.js for API development, emphasizing its performance and efficiency in handling real-time applications. It outlines the rise of APIs in various sectors, including mobile, IoT, and SaaS, and provides examples of successful migrations to Node.js by companies such as LinkedIn and PayPal. The document also highlights upcoming features in the Node.js ecosystem, including tools for enterprise integration and enhanced API management.
More Related Content
StrongLoop Overview
- 1. APIs in minuteswith Node.js Shubhra Kar Product Manager Oct 2014
- 2. Some StrongLoop personalities Bert Belder Ben Noordhuis Al Tsang Jimmy Guerrero Issac Roth John Higgins Raymond Feng Miroslav Bajtos Sam Roberts Ritchie Martori Ryan Graham Krishna Raman
- 3. 3 Jason PressmanKiran Prasad Neil Day Nick Sturiale Paul Ambrose Marten Mickos Fortune 10 retailer
- 4. The Frontend ischanging (Mobile First !)
- 5. API Economy 5 Transaction Volume 1 Billion 5 Billion 50 Billion API Endpoints Mashups SaaS Mobile IoT
- 6. Why APIs 6 SaaS Mobile IoT SOA Web App Server Database Datacube API Server HTML JSON
- 7. What’s needed ?Legacy services need to fit too ! API centric Enterprise Thousands to Millions of devices connecting to business APIs creating the new user experience APIs for each device, each app, each screen. Optimized for bandwidth & battery, adjusting to each device’s capabilities
- 8. Why Node? 8 Node is FAST …and highly concurrent! Node is perfect for APIs Node is JavaScript
- 9. What is Node.js? • Asynchronous, event-driven, non-blocking I/O platform that is perfect for real-time, data-intensive applications. • Single thread of execution • Built on Chrome’s JavaScript runtime engine, V8 • Uses Libuv, a high performance evented I/O library that works on Linux and Windows (faster than Libev) while there are still events to process: e = get the next event if there is a callback associated with e: call the callback
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- 11. Behind the Curtain Node Standard Library (JavaScript) Node Bindings C/C++ (socket, http, etc.) V8 Libuv Libeio (thread pool) Libev (event loop) IOCP (IO completion ports) epoll/kqueue/poll (event ports) Linux Kernel Windows Kernel Yes, it’s C back there
- 12. Why Node.js? •Lots of JavaScript programmers out there (>62K) • Very large and active developer community • Has the most modules (90K > Java)
- 13. Why Node.js? LinkedInmoved from Rails to Node.js – Cut down servers by 90% (30 3) – Lower memory overhead and up to 20X faster PayPal migrated to Node.js from Java: – Reduce development time by >50% – 2X speed of delivery with less than existing resources – 33% lesser lines of code – 40% fewer files Groupon displaced Ruby and Java with Node.js across the board: – 50% improvement in page response times – Agile builds and deploys
- 14. Nodies are notjust silicon valley hipsters ! And most recently…. Fortune 10 Retailer
- 15. Why do 2million developers Download Node.js every month?
- 16. Node vs Javafor REST routing 16
- 17. Node.. Roadmap pastv0.12 Upgrade v8 and debugger interface Flow Control – Promises, Generators, Zones, etc Error Reporting – Zones – Async-Tracker Enterprise Ops Integration – Logs, Monitoring, Build, Deploy, CI Ecosystem Reference deployments Concurrency 17 Breaking C++ API Changes
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- 21. Error tracking/recovery varhttp = require('http'); var cache = {}; function curl(url, cb) { if (cache[url]) return cb(null, cache[url]); var data = ''; http.get(url, function(res) { res.setEncoding('utf8'); res.on('data', function(s) { data += s; }); res.on('end', function() { cache[url] = data; cb(null, data); }); res.on('error', function(err) { cb(err); }); }); } // Usage: curl('http://www.google.com', console.log); 21
- 22. Error tracking/recovery varhttp = require('http'); var cache = {}; function curl(url, cb) { if (cache[url]) // WRONG: Synchronous callback return cb(null, cache[url]); var data = ''; http.get(url, function(res) { res.setEncoding('utf8'); res.on('data', function(s) { data += s; }); res.on('end', function() { cache[url] = data; cb(null, data); }); // WRONG: are you sure that 'end' and 'error' are mutually exclusive? res.on('error', function(err) { cb(err); }); }); // WRONG: the request object may emit 'error' } 22
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- 26. Zones for Errorcleanup strongloop.com/zone 26
- 27. What’s coming inExpress 27 Docs in markdown! https://github.com/strongloop/expressjs.com/issues
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- 30. Loopback: Open SourceAPI Framework in Node.js PUSH REST API GEO OFF SYNC DEVICE USER FILE Storage In-Memory REST API GATEWAY Channel SDKs CONNECT ORM API ENGINE D A T A M O D E L A P I S D K s REST API API Explorer Dev Ops ON-PREMISES / PRIVATE CLOUD / PUBLIC CLOUD
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- 32. API Gateway (Throttling,Proxy, OAuth) API Orchestrator Router Client SDK Isomorphic One URL Space Push API Micro Services Store Cache SL API PaaS Log Console Perf. Console Analytics Console Cloud Services REST/JSON ESB Micro-services Architecture Connectors Enterprise Services Standalone RDBMS NoSQL SOAP ERP Model ---------- ---------- ---------- Model ---------- ---------- ---------- Model ---------- ---------- ---------- REMOTING C O N N E C T O R C O N N E C T O R REST Endpoints Store Cache
- 33. Upcoming Distributed Provisioningand Routing Provision and Deploy App Service Container Service Container Service Container Nginx (LB / SSL) Store (State) Master Worker Worker Controller Agent API Gateway (Routing, Throttling, Proxy, OAuth) Service Container Service Container Service Container Nginx (LB / SSL) Store (State) Master Worker Worker Controller Agent Store (Groups, Routes and State) and Scheduler Server REST/JSON Service Mgr (Exec.) Service Mgr.
- 34. Marquee Features MobileSDKs Pre-Built Services ORM – no SQL Auto API Engine Enterprise Connectors API Gateway
- 35. Some cool featuresin Open Source Offline Sync & Replication Model Auto-Discovery and Relationship Connector
- 36. Automatic modeling andREST API generated
- 37. What’s coming inLoopBack GUI API Rate limiting OAuth 2.0 Swagger 2.0 37
- 38. & helps realizea full-stack JavaScript solution Develop Create UI & styling Arch. & binding Access Native Integrate Existing Data and Services Create Scaffolding Define base CSS Define components Use JS widgets Create Scaffolding Define Models Define Controllers Define Views Define Filters User Device File GeoLocation Notification Define Directives Configure Routes Connect to Data-sources (Oracle, SOAP, Mongo) Model the Data Generate REST API Configure API Security Setup Services Mobile App Mgmt. BLE
- 39. Node.js Platform Support 39 ① Multi-platform (Windows, Unix, Solaris, Mac) support ② On-premises, private or public cloud support ③ Certified Node.js curated modules and ecosystem ④ Commercial Enterprise supported, security updates node-inspector Passport Node-heapdump Node.js Core Loopback Strong-mq strong-cluster-control SL-Config strong-module- loader strong-cluster-connect- store strong-task-emitter Engine.io Mongoose Strong-agent strong-cluster-socket. io-store Asynch strong-config-loader Request Strong-remoting Q Connect Express EJS Socket.IO Reggie Postgres Connector Oracle Connector SQL Server Connector MongoDB Connector REST Connector In-Memory connector LIBUV V8 Profiler
- 40. DevOps Tools –Debugging
- 41. DevOps Tools –Runtime Mgmt. & Dynamic Scaling
- 42. DevOps Tools -Profilers
- 43. DevOps Tools -Performance Monitoring
- 44. StrongLoop’s commercial business Support Security subscription Training Consulting API Gateway strong-agent – Monitoring Connectors to enterprise systems API Microservices Mesh Controller
Editor's Notes
- #4 Jason Pressman Nick – Ignition, Splunk Neil – Walmart Kiran – LinkedIn Marten – MySQL, Eucalyptus Paul – WebLogic Juan Carlos – Informatica
- #12 Libuv: Full-featured event loop backed by epoll, kqueue, IOCP, event ports. Asynchronous TCP and UDP sockets Asynchronous DNS resolution Asynchronous file and file system operations File system events ANSI escape code controlled TTY IPC with socket sharing, using Unix domain sockets or named pipes (Windows) Child processes Thread pool Signal handling High resolution clock Threading and synchronization primitives
- #14 https://www.paypal-engineering.com/2013/11/22/node-js-at-paypal/ https://engineering.groupon.com/2013/misc/i-tier-dismantling-the-monoliths/#more-1551