Web Services: Web Services: a Mechanism for a Mechanism for

Across-the-Internet On Demand Across-the-Internet On Demand Computing and CommunicationComputing and Communication

DMS WorkshopDMS Workshop

Stevenson, WAStevenson, WAWed 08 June 2005Wed 08 June 2005

What are Web Services, What are Web Services, and how can they be useful to us?and how can they be useful to us?

How do they work? How do they work? What's needed to make one?What's needed to make one?

Web Services - 8 June 2005

Web Services WorkshopWeb Services Workshop

David Okaya (USC) Introduction: distributed vs. local computing.David Okaya Background basics of Across-the-Internet On-

Demand service.Phil Maechling (SCEC) Four current methods of distributed computing.John Graham (Telascience) What is a Web Service? An earth scientist's

view.Dennis Sosnoski (SSS) What is a Web Service? an IT view.

John Graham (Telascience) GeoFusion and Whirlwind web services.Dogan Seber, Choohan Youn (SDSC) GEON and seismology w.s.Andrea Donnellan (JPL) QuakeSim and SERVO w.s.Phil Maechling (SCEC) SCEC Community Modeling Environment w.s.Joanna Muench (IRIS) IRIS SOSA and DHI seismogram tools.

David Okaya (USC) Summary: distributed work environments.

Motivation for Web Services workshop:Motivation for Web Services workshop:Distributed versus local computingDistributed versus local computing

DMS WorkshopDMS Workshop

Stevenson, WAStevenson, WAWed 08 June 2005Wed 08 June 2005

David OkayaDavid OkayaUniv. Southern CaliforniaUniv. Southern California

Web Services - 8 June 2005

Internet MilestonesInternet Milestones: Not that long ago!: Not that long ago!

earth scienceearth science widespreadwidespreadfeaturefeature originationorigination radar screenradar screen usageusage

Static WebStatic WebWWW - htmlWWW - html 1993 first browser1993 first browser ~1996~1996 ~2000~2000

Dynamic WebDynamic Web

search enginessearch engines 19951995 1998 Google1998 Google ~2000~2000

scripts CGI/perlscripts CGI/perl 19951995 late 1990slate 1990s ~2000 ~2000

JavaJava 1995 SUN release1995 SUN release 1998-20001998-2000 ----------

appletsapplets 19951995 late 1990slate 1990s ----- -----

servletsservlets 19971997 early 2000searly 2000s ----- -----

XMLXML 19981998 early 2000searly 2000s ----------

web servicesweb services 20012001 2002+2002+ ----- -----

Semantic Web (find, share, combine Web info via machine-readable ways)Semantic Web (find, share, combine Web info via machine-readable ways)

Web Services - 8 June 2005

Meaning of "Web Service"Meaning of "Web Service"ConceptualConceptual::

Performance of "across-the-Internet on-demand" functionality.Performance of "across-the-Internet on-demand" functionality.The requesting and computing computers are not tightly coupled.The requesting and computing computers are not tightly coupled.

Technical:Technical:

A framework for offering a functionality using specific protocols.A framework for offering a functionality using specific protocols.

"Across-the-Internet on-Demand" Distributed Computing"Across-the-Internet on-Demand" Distributed Computing

Coupled (and HTML based):Coupled (and HTML based): Loosely coupled (obj.-orient. based):Loosely coupled (obj.-orient. based):- cgi/perl- cgi/perl - java servlets- java servlets- php- php - CORBA- CORBA- javascript- javascript - java RMI- java RMI

- web services- web services

ANDAND in either case, in either case, notnot necessarily tied to an HTML web page. necessarily tied to an HTML web page.

Web Services - 8 June 2005

Benefits of Distributed Computing via Benefits of Distributed Computing via Web ServicesWeb Services

ResourcesResources•• Compute resources not locally available to requester ("client"): Compute resources not locally available to requester ("client"): computer time, storage/memory, applications.computer time, storage/memory, applications.•• Access to evolving databases and data archives maintained Access to evolving databases and data archives maintained

elsewhere.elsewhere.

FunctionalityFunctionality•• Access to a range of functionalities (very simple to high end).Access to a range of functionalities (very simple to high end).•• Original codes maintained and improved by authors, not users.Original codes maintained and improved by authors, not users.

Community EnvironmentCommunity Environment•• Sharing of codes, utilities; development of community toolkit.Sharing of codes, utilities; development of community toolkit.•• Commonality or standardization for a group of users.Commonality or standardization for a group of users.

Web Services - 8 June 2005

Examples of Web Service FunctionalityExamples of Web Service Functionality

UtilitiesUtilities•• latitude/longitude to UTM and other map projections.latitude/longitude to UTM and other map projections.•• calendar to Julian dates to epoch seconds.calendar to Julian dates to epoch seconds.•• Header dumps of formats such as DEM, miniSEED, SAC.Header dumps of formats such as DEM, miniSEED, SAC.

Formats and TranslatorsFormats and Translators•• Ascii to binary; endian swap; postscript to JPEG, JPEGs to MPEG.Ascii to binary; endian swap; postscript to JPEG, JPEGs to MPEG.•• Translation between formats such as miniSEED, SAC, SEGY.Translation between formats such as miniSEED, SAC, SEGY.

DeliveryDelivery•• Extraction from data archives; "slice & dice" of data products.Extraction from data archives; "slice & dice" of data products.•• Visualization of data products.Visualization of data products.

Research CodesResearch Codes•• Interface to scientific codes.Interface to scientific codes.•• Wrapping of scientific (legacy) codes. SAC, modeling codes, GMT.Wrapping of scientific (legacy) codes. SAC, modeling codes, GMT.

Access via web page, GUI, from within (object-oriented) codes, and Access via web page, GUI, from within (object-oriented) codes, and even command line utility.even command line utility.

Web Services - 8 June 2005

Web Services WorkshopWeb Services Workshop

David Okaya (USC) Introduction: distributed vs. local computing.David Okaya Background basics of Across-the-Internet On-

Demand service.Phil Maechling (SCEC) Four current methods of distributed computing.John Graham (Telascience) What is a Web Service? An earth scientist's

view.Dennis Sosnoski (SSS) What is a Web Service? an IT view.

John Graham (Telascience) GeoFusion and Whirlwind web services.Dogan Seber, Choohan Youn (SDSC) GEON and seismology w.s.Andrea Donnellan (JPL) QuakeSim and SERVO w.s.Phil Maechling (SCEC) SCEC Community Modeling Environment w.s.Joanna Muench (IRIS) IRIS SOSA and DHI seismogram tools.David Okaya (USC) Summary: distributed work environments.

A.M.

P.M.

EarthScope CSIT Workshop, March 25-27, 2002

SDSC/Cal-(IT)2 Information Integration Testbed

SociologyWorkbench

SOAP

WSDL

SOAP

WSDL

SOAP

WSDL

I2T Mediator

Clients

XML (GML)

XML queries

Surveydata

SOAP

WSDL

ArcIMSArcSDE

ICPSRUniv. of

Michigan

Spatial mediator DatabaseIntegration

StatsPackage

TechnologyTechnologyto automateto automatecreation ofcreation of

Web servicesWeb services(“Query Set (“Query Set

Specification”)Specification”)

Industry partners:Enosys

ESRIIBM DiscoveryLinks

Blue Titan

Spatial Spatial mediation:mediation:• Dealing with Dealing with differences in differences in resolution, scaleresolution, scale• Plug-in Plug-in conflation conflation routinesroutines• Web workflows Web workflows and Service and Service “orchestration”“orchestration”

from Chaitan Baru (SDSC)