Integrating Node.js

Transcript

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   Integrating Node.js into an existing technology stack

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   Andrew Nesbitt github.com/andrew @teabass

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   forwardtechnology.co.uk

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   None
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   None
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   None
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   Show of hands

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   Benefits of Node

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   Legacy Systems

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    Benefits of integration

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    Let’s do this!

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    1. Standalone Tools

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    Command line tools Asset minification Pixel Trackers Url shorteners Internal

    tools Monitoring Chat bots Examples
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    Legacy App Internal tool Internal tool Internal tool Internal tool

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    Easy to setup Very little integration Little experience needed Pros

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    Extra dependencies Knowledge silos Cons

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    2. Shared databases

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    Connect directly existing database Read from a data warehouse Share

    data with a key-value store Examples
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    Legacy App DB Node

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    Quick and dirty Adapters for almost every DB available Slow

    databases not a problem Pros
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    Duplicating domain logic Race-conditions Your DBA will likely hate you

    Cons
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    None
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    3. Using APIs

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    Use API from existing application Linkedin Mobile Github Downloads Examples

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    Legacy App DB Node

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    Avoid duplication of domain logic JSON APIs are lovely to

    work with Plays to Nodes strengths Pros
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    Extra load on existing application Might have to build/extend existing

    API What if the legacy app goes down? Cons
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    4. Creating APIs

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    Websocket Services Streaming services APIs for Mobile Apps Proxy serivces

    File upload handling Ebay’s ql.io Examples
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    DB Node Clients

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    Handle very load Lots of concurrent connections JSON comes naturally

    Pros
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    Cons You now have a dependeny on Node System adminstration

    Teaching others about it
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    mysql Rails Disc Cache Nginx Redis Node Browser Pusher http://live.mpora.com

    Mpora Live
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    5. Message Queues

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    ZeroMQ Resque Redis Pubsub dnode Examples

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    Message Queue Legacy App Node Legacy Worker

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    6. Streams

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    Twitter, Facebook, Salesforce HTTP long polling Comet XMPP Examples

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    7. Embedding

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    Ruby Racer Android Hadoop and Timothy Sprintstack PLV8 Examples

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    create or replace function fib(n int) returns int as $$

    function fib(n) { return n<2 ? n : fib(n-1) + fib(n-2) } return fib(n) $$ LANGUAGE plv8 IMMUTABLE STRICT;
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    http://pgeu-plv8.herokuapp.com

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    Legacy App Node

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    Scripting within compiled languages Use existing, battle tested software Enable

    Node on embedded devices Pros
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    Under heavy development You need to know the host platform

    Context switching overhead Cons
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    Take a unix-like approach Decoupled Systems Use APIs to share

    data Play to node’s strengths Summary
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    Node on Andriod - lanyrd.com/smpbg Rails and Node.js - lanyrd.com/srmwr

    Hadoop and Timothy - lanyrd.com/sttxx Rhinode (Sprintstack) - lanyrd.com/srmwx These slides - lanyrd.com/szwyc Links