Emerging-Web-App-Arch-Using-Java-and-Node.txt

NodeSummit, San Francisco, CA, Wed 27 Jul 2016

Emerging Web Application Architectures Using Java and Node.js

Chris Bailey
Runtime Technologies Developer, IBM
Using Node, Java, Swift.
Contributes to open source.
@chris__bailey

In 2005, everything was three tier web apps.
HTTP, load balancer, Java, database.
Wrapped in clustering for scalability.
Invariably written in Java.
Then started looking at richer web sites.
JavaScript is ubiquitous.
Won't be doing that with Java.
Lots of people have existing Java technologies.
But need richer web apps.
Node.js.
300K packages available.
Java has half the packages, rate of growth is much lower.
On average, can write 45% less code in Node than Java.
Write apps significantly faster in Node.
Java has scalability using threads.
Each thread consumes memory, but is relatively idle.
Build highly concurrent apps in Node more easily.
Pre-render page on server with Node.
So is there any advantage to using Java anymore?
Why would you still use Java?
Java is much faster if no I/O.
Better at number crunching.
Highly optimized.
Java designed for this for a long time.
With Java, types are known, so can add with single instruction.
JavaScript must determine type, that takes cycles.
TechEmpower benchmarks.
JSON serialization, Java faster.
Single query, Java slight advantage.
Data updates, Node faster.
But this assumes Java running in asynch model, sync not so great.
To build best possible app, select best language for task.
Services organized around capabilities.
API support in Node is better than any other language.
Use Java for computational tasks.
Use Node for I/O bound tasks.
Use Node for isomorphic apps.
Use Java for transactional updates.
Node used for highly I/O bound, highly scalable apps.
Put Node and Java together.
Reliable transaction processors.
Emerging architectures.
Use Node to add REST APIs to existing technologies.
Elastic search, written in Java.
Go is a reasonable replacement for Java.
Old, deploy in months, five year life.
Now, deploy in days, life in months.
From Forrester, four tiers: client, delivery, aggregation, services.
IBM API Connect is a Node service.
Retail customer, spike in sales if can deploy in hours in response to social media.
Capitalize on social media.