Oracle application container cloud back end integration using node final

OOW 2016: CON 1283
Maarten Smeets
Oracle Application Container Cloud Service
Back-End Integration Using Node.js

Introduction
• About AMIS
– Located in the Netherlands
• About me
– Oracle Integration Consultant
– Experience with Oracle SOA Suite since 2007
– Well certified (SOA, BPM, Java, SQL,
PL/SQL among others)
– Author of a lot of blog articles
(http://javaoraclesoa.blogspot.com)
@MaartenSmeetsNL
https://nl.linkedin.com/in/smeetsm

Agenda
Node.js introduction Backend integration Application Container Cloud What to use for your
integration?

Node.js
Using threads is hard
• Concurrency control mechanisms (e.g. locking)
• Coordination over threads (IPC)
• Memory overhead
• Synchronization
• Programming thread safe code is not easy

What is Node.js
• Node.js uses a single thread!
• Node.js has been created
To write high-performance servers fast
• Node.js is:
– a set of bindings to V8 for non-browser work: sockets, files, etc.
– only exposes non-blocking, asynchronous interfaces
– only one thread, one call stack (like a browser)
– low level features: half-closed TCP connections, TCP throttling, UDP
– has killer HTTP support
Node.js architecture
node standard library
node bindings
(socket, http, etc)
V8
thread pool
(libeio)
event loop
(libev)
C/C++JavaScript

Node.js
What do they use it for?
“On the server side, our entire mobile software stack is completely built in Node”
“We are moving every product & every site within PayPal to Node”
“We’ve been busy building our next-generation Netflix.com web
application using Node”
“MuleSoft's Anypoint platform services are implemented in Node”

Node.js
Integration. Overview
POST /myservice
Receive request
Service
Implementation
Processing input
Creating output
Message processing
Backend
Front-end connectivity
Routing
Back-end connectivity
Flow control

Node.js
Integration. Overview
Front-end connectivity
• URL handling
• HTTP connection handling
Back-end connectivity
• Connect to other services
• Drivers to access technology
diverse systems
• Connection pooling
Drivers / modules such as
• Oracle Database
• Oracle NoSQL Database
• Mongo Database
• SOAP and JSON services
What
Frameworks such as
• Express
• Hapi
• Koa
• Sails
• xml2js
• node-soap
Message processing
Middleware
• Routing
• Mapping
Flow control • Async
• Promises
How

Node.js
Frameworks
• Abstraction
• Generic functionality
• Facilitate development
• Drawbacks
– Performance cost
– Need framework knowledge
– Only specific functionality
https://raygun.com/blog/2016/06/node-performance/
0
2000
4000
6000
8000
10000
12000
14000
raw node koa express restify hapi
Requestspersecond
Framework

Node.js
Frameworks: Express.js
• Express is a minimal and flexible Node.js web application framework that provides a robust set of features
for web and mobile applications.
• Express.js is used in many other popular frameworks like Sails, MEAN, LoopBack
• It is maintained by StrongLoop (IBM).
Started in 2009. 191 contributers. 6,823,598 downloads last month *
* Contributers from github.com. Downloads from npmjs.com. Determined 28 aug 2016

Node.js
Without framework
var http = require('http');
var server = http.createServer(function (req, res) {
if (req.method === 'GET') {
res.end("Hello World");
}
});
server.listen(3000);

Node.js
With express.js
var express = require('express');
var app = express();
app.get('/', function (req, res) {
res.send('Hello World');
});
app.listen(3000);
Quick and easy

Node.js
Frameworks: Other
• Hapi
A rich framework for building applications and services. Configuration is better
than code. Business logic must be isolated from the transport layer.
Started in 2011 146 contributers 234,103 downloads last month.
• Koa
Expressive, light-weight HTTP framework for Node.js to make web applications
and APIs more enjoyable to write.
• Sails
Sails is the most popular MVC framework for Node.js. It is designed for building
practical, production-ready Node.js apps. Build on top of express.

Node.js
Callback hell
Error handling in every callback handler
Nested callbacks

Node.js
Flow control. Executing in series
• Async
Async is a utility module which provides straight-forward, powerful
functions for working with asynchronous JavaScript.
• Promises
A Promise object represents a value that may not be available yet,
but will be resolved at some point in the future. It allows you to
write asynchronous code in a more synchronous fashion.
• Generators
The Generator object is returned by a generator function and it
conforms to both the iterable protocol and the iterator protocol.

Node.js modules
Convert XML <> JSON
• xml2js
Ever had the urge to parse XML? And wanted to access the data in some sane, easy way? Don't want to
compile a C parser, for whatever reason? Then xml2js is what you're looking for!
• xml2js uses SAX (Simple API for XML)
– Event driven asynchronous processing of XML
– Memory friendly
Does not require creating a Document Object Model (DOM) of the XML document in memory
</> {}

Node.js modules
How does JSONized SOAP look?
Mind the namespace prefixes!

Node.js modules
node-soap
node-soap is a module that offers SOAP support

Node.js modules
node-soap
Define the service logic
Load the WSDL
Create the server
Host the webservice

Node.js and back-end integration

Database integration with Node.js

Oracle NoSQL highlights
• Key value pair database
• Dynamic data model
• Transparent load balancing
• Highly scalable
• Options for transactional
mechanisms
• Options for eventual consistency
• Built on BerkelyDB

NoSQL highlights
http://www.oracle.com/technetwork/database/nosqldb/overview/nosql-transactions-497227.html
Transactional mechanisms
Consistency models

Node.js
Node.js and NoSQL
Application
Node.js
Application
RMI
RMIJSON
Thrift
nosqldb-oraclejs
JVM
NoSQL Java proxy
kvclient
WL/GlassFish/Tomcat
REST Data Services
(ORDS)
kvclient

Node.js and MongoDB
BSON
Node.js
Application
mongoose

Node.js and the Oracle Database
node-oracledb
• Maintained by Oracle and actively being developed
• Requires Oracle database client software installed
Application Container Cloud already provides this
• Very rich in features and well documented!
https://github.com/oracle/node-oracledb
Node.js
Application
nosqldb-oraclejs

node-oracledb: Features
• Promises, Callbacks and Streams
• SQL and PL/SQL execution
• REF CURSORs
• Large Objects: CLOBs and BLOBs
• Oracle Database 12.1 JSON datatype
• Query results as JavaScript objects or arrays
• Smart mapping between JavaScript and Oracle types
with manual override available
• Data binding using JavaScript objects or arrays
• Transaction Management
• Inbuilt Connection Pool with Queueing
• Database Resident Connection Pooling (DRCP)
• External Authentication
• Row Prefetching
• Statement Caching
• Client Result Caching
• End-to-end Tracing, Mid-tier Authentication, and
Auditing
• Oracle High Availability Features
– Fast Application Notification (FAN)
– Runtime Load Balancing (RLB)
– Transparent Application Failover (TAF)

node-oracledb: Calling PL/SQL
Define bind variables IN
Define bind variables OUT
Call a PL/SQL function

node-oracledb: Connection pooling
Good sample: http://stackoverflow.com/questions/29846188/node-js-express-oracle-connection-pooling-ora-24418-cannot-open-further-sess
Create a connection pool
Grab a connection from the pool and use it
Close when done. Also in case of errors!
Inbuilt queueing

Using DRCP with node-oracledb
• Database Resident Connection Pooling (DRCP)
http://www.oracle.com/technetwork/articles/oracledrcp11g-1-133381.pdf

Using DRCP with node-oracledb
• On the client:
– Set oracledb.ConnectionClass = ‘poolname’
– Easy Connect syntax like myhost/sales:POOLED, or by using a tnsnames.ora alias for a connection that contains (SERVER=POOLED)
– Set externalAuth to true in getConnection or createPool
• On the database
– execute dbms_connection_pool.start_pool(“poolname”);
https://www.youtube.com/watch?v=3p6rutSLlkg
Simple to use

Performance with node-oracledb
• Make sure you create a connection pool in the
right scope to promote re-use
• Consider increasing the LibUV thread pool size.
The default is 4. Can be set with environment
variable: UV_THREADPOOL_SIZE
• Explicitly release connections to the pool
• Use a resultSet when the number of rows fetched is large
• Consider using DRCP
Read: http://docs.oracle.com/database/121/ADFNS/adfns_perf_scale.htm#ADFNS228

Introducing Application Container Cloud

Node.js
What doesn’t it provide?
• High availability
– Clustering capabilities
– Load balancer
– On demand scaling
• Management and monitoring
• Support
• Provisioning
• Deployment
• Patching
• Back-end drivers
99.999%

Node.js
What doesn’t it provide?
• High availability
– Clustering capabilities
– Load balancer
– On demand scaling
• Management and monitoring
• Support
• Provisioning /Deployment
• Patching
• Back-end drivers
99.999%

Application Container Cloud
Enterprise Grade Features for Node.js

Application Container Cloud Service
Architecture
Tenant1
Tenant2
(App 1) (App 2) (App 3)
Load Balancer
Database Cloud
Java Cloud
Messaging Cloud
Storage Cloud
Developer Cloud
Customers
< / >
Developers

Enterprise grade features for Node.js
• On demand scale out/in.
Adding/Removing instances
• On demand scale up/down.
Adding/Removing memory per instance
• Automatic load balancer configuration
• One click patching

• Easy web interface for
deployments
• Also possible using the API
and Developer Cloud Service
Easy!

• Easy web interface for managing configuration
• Including service bindings
such as database connections

• Browse log files from the webinterface

https://docs.oracle.com/cloud/latest/apaas_gs/APCSR/

Integration with Developer Cloud Service
pom.xml
maven-assembly-plugin
assembly.xml
YourApplication.zip
Node.js application
manifest.json

• Build and deploy with Developer Cloud Service

Integration: SOA Suite or Node.js?

Node.js versus SOA Suite
SOA Suite
Node.js architecture
node standard library
node bindings
(socket, http, etc)
V8
thread pool
(libeio)
event loop
(libev)
C/C++JavaScript
Node.js

Integration with Node.js or SOA Suite
• Node.js assets
– thin stateless services like microservices
– tying simple things together with minimal effort
– technology focus: JavaScript + REST/JSON
– High performance
• Node.js challenges
– no adapters, workflow, …
– no wizard driven IDE
– requires (a lot of) custom code
– no high availability / management / monitoring options
Consider Application Container Cloud to provide those

Questions
@MaartenSmeetsNL
https://nl.linkedin.com/in/smeetsm
Download sample code at
https://github.com/MaartenSmeets/nodejssamples

Oracle application container cloud back end integration using node final

Oracle application container cloud back end integration using node final

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