cool apps: building cryospheric data applications with standards-based service oriented architecture

Cool Apps: Building Cryospheric Data Applications With Standards-Based Service Oriented ArchitectureJulia A Collins, Ian Truslove, Brendan W Billingsley, Joseph Oldenburg, Mary Jo Brodzik, Scott Lewis, Miao Liu

Outline

1. Introduction2. The Web, circa 20123. 3-tier and Service Oriented

Architectures (SOA)4. Service standards5. NSIDC apps6. Proposal

Cool Apps: Building Cryospheric Data Applications With Standards-Based Service Oriented Architecture

INTRODUCTION


Introduction

The National Snow and Ice Data Center (NSIDC) supports research into our world's frozen realms: the snow, ice, glaciers, frozen ground, and climate interactions that make up Earth's cryosphere.NSIDC manages and distributes scientific data, creates tools for data access, supports data users, performs scientific research, and educates the public about the cryosphere.


Introduction

distributes scientific data

creates tools for data access

supports data users


Introduction


The Web

Distribution of

scientific data

Tools for data

access

Supports data users

Introduction


The Web

Distribution of

scientific data

Tools for data

access

Supports data users

3rd party tools

THE WEB


Web Applications


http://blog.fogcreek.com/the-trello-tech-stack/

3-Tier Web Architecture


JavaScript Web client

Application Server

Data Abstraction / ORM

Database

Presentation

Business LogicData



The Problem:



Tight CouplingThe Problem:



The Problem:

1 user interface requires 1 app stack



…and perhaps

portalproliferation

problem

The Problem:



Extending…



New app

Other data

Bridge



The Problem:

1 user interface requires ≥1 app stack(hopefully in the same language)

SOA Web Architecture


System A

Client App 1

XML JSON

Service Interfaces


Clients consume service interfaces

Loose coupling

Systems expose service interfaces

Service Interfaces


Extending…



System A

Client App 1

Service Interfaces


service interfaceproliferation

problem

The Problem:

Service Interfaces and Standards



…service interfaces conforming to standards

Service Standards


OGC WMS, WFS, WPS, …OPeNDAPRESTATOMESIP OpenSearchOAI-PMH

data:

publishing:

discovery:metadata:

Service Interfaces


Reusing…



Client App 1Client App 2 Client App 3

System BSystem A

Many clients…



Client App 1

System A

Many service providers…

System B

Implementing Services


Adopt>

Extend>

Roll your own

Service Standards


REST is aN Architectural style!

Services: Roll Your Own


DiscoverabilityComprehensibil

ityUniversalityExtensibility

Desirable properties include:

Services, RESTfully


Discoverability:hypermedia constraint, published

media typesComprehensibility:

familiar URIs; media typesUniversality:

HTTP transport; XML or JSON payloadsExtensibility:

XML, e.g. ATOM

Implementing Services


Adopt>

Extend>

Roll your own RESTful services

SOA @ NSIDC


GeoTIFF map data

GeoTIFF map data

GeoTIFF map data

MapServer

IceBridge Portal ACADIS Arctic Data Explorer

Metadata DB

get_metadata

DIF XMLDIF XML

GI-CatjOAISearchlight

Services

Searchlight Core

Libre DataCaster

Libre Aggregator

Web

App

sS

ervi

ces

Dat

aNSIDC’s Service Oriented Architecture


OAI-PMHESIP Collection Cast

ESIP OpenSearch

WMS, WFS

ESIP OpenSearch

ESIP OpenSearch

Dat

aS

ervi

ces

Web

App

sNSIDC’s Service Oriented Architecture


get_metadata

Metadata DB

OAI-PMHSearchlight

CoreESIP Collection Cast

ESIP OpenSearch

MapServer

WMS, WFS

DIF XMLDIF XML

GeoTIFF map data

GeoTIFF map data

GeoTIFF map data

ESIP OpenSearch

Libre DataCaster

GI-CatjOAILibre

Aggregator

ESIP OpenSearch

Searchlight Services

ACADIS Arctic Data ExplorerIceBridge Portal

Operation IceBridge Portal


Operation IceBridge Portal


NSIDC Searchlight

ESIP OpenSear

ch

NSIDC MapServer

WMS

WFS

Libre Aggregator

ESIP OpenSearch

ACADIS Arctic Data Explorer





ESIP OpenSearch

OAI-PMHOPeNDAP

NSIDC metadata catalog

EOL field catalog (NCAR)

Met.no metadata catalog

ACADIS Gateway (NCAR)

+/-/Δ: OBSERVATIONS


Disadvantages


ComplexityCompromise

Development time

Advantages


Reuse (and reusability)Off-The-Shelf Software

Development time

Challenges


DocumentationAdoption

Continuity

THE WEB OF SERVICES


The Web of Services



The Web of Services


Web clients…

The Web of Services


Web browsers have security restrictions…

(“same origin policy”)

The Web of Services


My web client may not consume

your service interface

A MODEST PROPOSAL


Goal


Increase the pool of

potential users (web

applications) of our data

HTML5 Standard: CORS


CORS: Cross Origin Resource Sharing

http://www.w3.org/TR/cors/http://enable-cors.org/

Proposal


Write service-enabled clients

Build standards-based services

Enable CORS

Share and reuse data and services

Poster


Joe Oldenburg: “Cool Apps”

IN43B-1517

Questions


Write service-enabled clients

Build standards-based services

Enable CORS

Share and reuse data and services

[email protected]@iantruslovehttp://goo.gl/xkxgd

me:

this presentation:

mailto:[email protected]

http://goo.gl/xkxgd

http://goo.gl/xkxgd

http://goo.gl/xkxgd

cool apps: building cryospheric data applications with standards-based service oriented architecture

Technology