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QuakeWatch System CISN Display Client. Technology used for Rapid and Reliable “Push” of Earthquake Information to Critical Users. July 9, 2003 Paul Friberg, ISTI. QuakeWatch Overview. Design requirements Server technology Server details CISN Display details Demonstration.

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quakewatch system cisn display client

QuakeWatch SystemCISN Display Client

Technology used for Rapid and Reliable “Push” of Earthquake Information to Critical Users

July 9, 2003

Paul Friberg, ISTI

quakewatch overview
QuakeWatch Overview
  • Design requirements
  • Server technology
  • Server details
  • CISN Display details
  • Demonstration
general system design requirements
General System Design Requirements
  • Replace the legacy CUBE/REDI system
  • Rapidly & Reliably push data to end users
  • Operate on any platform (both client & server)
  • Use Internet standards (TCP, CORBA, XML)
  • Push earthquake info & any related data products (expandable protocol)
  • Scalable server
  • High-end GIS-based client
  • Provide an open platform for expansion
quakewatch server technology
Quake Products

Quake Data

RapidNS

Plug-in

your

Plug-in

QDDS

Plug-in

Message Channel 1

Message Channel 2

Plug-in API

Message Channel N

QuakeWatch Server Core

Client Services (API), XML

HTTP

CISN clients

CORBA

XML

XML

QuakeWatch Server Technology
  • Written in Java
  • CORBA IDL for services
  • CORBA Notification Service for messaging
  • XML message format
  • “Plug-in” feeder modules
  • Scalable architecture
  • FTP/HTTP for “out of band” product retrieval
corba what is it
CORBA: What is it?
  • Common Object Request Broker Architecture (distributed component computing) “the glue”
  • Backed by over 800 companies (See www.omg.org)
  • Well developed (since 1994) standard middleware technology used by Banking, E-commerce, Aerospace, Communications, and Manufacturing
  • American Airlines, Raytheon, Boeing, SABRE, Weather Channel, Wells Fargo, Chase Manhattan, Credit Suisse, Bank of America, and AT&T
  • See www.corba.org for more details.
quakewatch corba usage
QuakeWatch CORBA Usage
  • OpenOrb open-source (See www.openorb.org)
  • Bi-Directional IIOP (firewall penetrating)
  • IIOP Standard Internet Protocol
  • CORBA Interface Definition Language (IDL)
  • QuakeWatch Server CORBA Services
    • Login/Authentication
    • Request missing Event/Product messages
    • Client/Server versioning information
    • Alternative Server listing
    • Client redirect to another server
  • Messaging using the CORBA Notification Service
corba notification service
CORBA Notification Service
  • Rapid Push (best effort delivery via TCP)
  • Middleware software Message Channel
  • All clients subscribed to Message Channel receive messages.
  • Server alive messages are sent to clients in addition to Quake related messages.
  • Message Channels can be distributed.
  • Unlimited number of Message Channels.
quakewatch xml messages
QuakeWatch XML messages

MsgNumber CDATA #REQUIRED

MsgVersion CDATA #IMPLIED

ServerID CDATA #IMPLIED

TimeGenerated CDATA #IMPLIED

MsgSource CDATA #IMPLIED

CreatedSource CDATA #IMPLIED

Signature CDATA #IMPLIED>

Command CDATA #REQUIRED

Value CDATA #IMPLIED>

Action CDATA #REQUIRED

TimeReceived CDATA #REQUIRED>

EventIDKey CDATA #REQUIRED

DataSource CDATA #REQUIRED

Authoritative (Y|N) #IMPLIED

Version CDATA #IMPLIED>

Continued…………..

  • XML - eXtensible Markup Language
  • Standard Internet data distribution format
  • Changes to messages do not break clients
  • Events and Products
  • Clearly defined schema
  • Document Type Definition
quakewatch server plug in
RapidNS

Plug-in

QDDS

Plug-in

your

Plug-in

XML

Plug-in API

QuakeWatch Server Core

Client Services (API), XML

QuakeWatch Server “Plug-in”

New Data

QuakeData

  • Written in Java
  • Well defined Application Programmer Interface
  • QDDS modifications were trivial to make it a plug-in
  • QWS is an end-user of QDDS not a competitor
  • XML formatter of event data and products
  • Data suppliers can provide custom products
qw server performance
QW Server Performance
  • Latest Beta tests have shown excellent reliability and stability.
  • QuakeWatch Server uptime 46 days as of July 7
  • Running on stock Intel hardware RedHat 9 OS
  • Tested with 10’s of clients
  • Tested over numerous Internet connections (dial-up, cable modem, satellite)
  • Tested behind firewalls/NAT.
client server services interaction
Client/Server Services Interaction

Connection Requested

QWServer Portal

Authentication & Referral

CISN Display

Client

QWMessage

Channel

Internet

Connect to Message Channel

messaging interaction
Messaging Interaction

Message!

Message

Channel

Server

Client

Internet

Fetch additional

Content automatically

via HTTP/FTP

Product Server

(Web content, ShakeMap,

CIIM Reports etc.)

cisn display overview
CISN Display Overview
  • Replicates CUBE/REDI app. & USGS “Recent Quakes” web
  • GIS capable via OpenMap
  • Uses USGS QDM filter
  • Fully user configurable
  • Automatic download and display of ShakeMap GIS files
  • Settable alarms to alert users
  • Install wizard for easy installation
  • Firewalls not a problem
  • Tested under Windows, Mac OS, Linux, and Solaris
  • Commercial support available
gis capability with openmap
GIS capability with OpenMap
  • Free Java-based mapping engine from BBN (well supported)
  • Expandable since it is open-source
  • Provides input of standard GIS layers (ESRI, MapInfo)
  • Permits basic GIS operations (e.g. ArcView)
  • Allows end-user to include any number of possible layers.
  • Nationwide and global mapping capability.
current developments
Current Developments
  • New server plug-in’s
  • New client applications (PDA)
  • End-user authentication mechanism improvements
  • User documentation
recap of quakewatch system goals
Recap of QuakeWatch System Goals
  • Earthquake notification system for critical users
    • Quick
    • Reliable
    • Expandable
    • Easy to install and use
  • Gateway to earthquake products on the web
  • Platform for future development and expansion
  • Entirely open-source system
  • Replaces legacy CUBE/REDI display systems
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