Full HTML for

Basic foilset WebFlow and Friends for Education and Science Portals

Given by Geoffrey C. Fox, Tom Haupt at NCSA Portal/Metadata Meeting on October 22-23 99. Foils prepared October 24 99
Outside Index Summary of Material

3-Tier Architecture with two well defined API's in XML
  • Grid and Computing Portal (WebFlow) API
Portals Built and in Progress
  • Alliance, Education, DoD, CRPC, Earthquake, DMSO, "Generic"
Features of WebFlow/Gateway
  • Component/Containers(EJB's JWORB and CORBA)
  • Security (Kerberos and Secure CORBA)
  • Events (CORBA style and link to Tango Interactive)
  • Application Composition/Integration
General Issues and Special Services
  • Commercial Enterprise (iPlanet etc.) and Education (Blackboard, WebCT) portal building tools
  • Collaboration Architecture and Demonstration from Tango Interactive with Biology Workbench(Shared Portal on the Web)
  • Universal Access and linking with PalmTops (MicroPortal)

Table of Contents for full HTML of WebFlow and Friends for Education and Science Portals

 Denote Foils where Image Critical
Denote Foils where HTML is sufficient
1 WebFlow and Friends for Education and Science Portals
2 WebFlow/Gateway/Tango/JWORB Topics
3 Basic Architecture and Inter Relationships
4 Hierarchy of Portals and Their Technology
5 WebFlow Computing and Component Model
6 PPT Slide
7 PSE Layered User View (AT Team Dependent)
8 PPT Slide
9 WebFlow Component Model
10 PPT Slide
11 PPT Slide
12 WebFlow and Tango Events
13 WebFlow Events (1)
14 WebFlow Events (2)
15 Shared Event Collaboration Framework
16 XML Collaborative Web Page Architecture
17 Shared Form Illustrated by Shared Access to NCSA Biology Workbench showing how general server objects can be shared from web interface
18 WebFlow Applications
19 WebFlow on Globus -- LMS at CEWES
20 Example of a custom Web User Interface Land Management System
21 NCSA Quantum Simulations: Build Application from Components
22 PPT Slide
23 PPT Slide
24 Wrapping Existing Applications
25 Example IDL definition
26 PPT Slide
27 PPT Slide
28 PPT Slide
29 PPT Slide
30 WebFlow on Globus -- LMS at CEWES
31 Example of a custom Web User Interface Land Management System

Outside Index Summary of Material

HTML version of Basic Foils prepared October 24 99

Foil 1 WebFlow and Friends for Education and Science Portals

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
NPAC Syracuse University 111 College Place
Syracuse NY 13244-4100
Geoffrey Fox
Tom Haupt
NCSA Alliance Portal Meeting UIUC
Oct 22 1999
HTML version of Basic Foils prepared October 24 99

Foil 2 WebFlow/Gateway/Tango/JWORB Topics

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
3-Tier Architecture with two well defined API's in XML
  • Grid and Computing Portal (WebFlow) API
Portals Built and in Progress
  • Alliance, Education, DoD, CRPC, Earthquake, DMSO, "Generic"
Features of WebFlow/Gateway
  • Component/Containers(EJB's JWORB and CORBA)
  • Security (Kerberos and Secure CORBA)
  • Events (CORBA style and link to Tango Interactive)
  • Application Composition/Integration
General Issues and Special Services
  • Commercial Enterprise (iPlanet etc.) and Education (Blackboard, WebCT) portal building tools
  • Collaboration Architecture and Demonstration from Tango Interactive with Biology Workbench(Shared Portal on the Web)
  • Universal Access and linking with PalmTops (MicroPortal)
HTML version of Basic Foils prepared October 24 99

Foil 3 Basic Architecture and Inter Relationships

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
HTML version of Basic Foils prepared October 24 99

Foil 4 Hierarchy of Portals and Their Technology

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Portal Building Tools and Frameworks (XML, iPlanet, Portlets, www.desktop.com)
Enterprise Portals
Generic Portals
Information Services
Compute Services
Education and Training Portals
Science Portals
K-12
University
Biology
Chem Egy
Generic Services
Collaboration
Universal Access
Security .......
Databases .......
MathML etc
Quizzes Grading ...
Education Services
Grid Services
Visualization ...
User customization, component libraries, fixed channels
HTML version of Basic Foils prepared October 24 99

Foil 5 WebFlow Computing and Component Model

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
One Possible Front End is Graphical Composition
Use Web Browsers as new W3C standards with version 5 navigators have well defined standards and high functionality
Middle Tier Supports Proxies as Components and Containers
HTML version of Basic Foils prepared October 24 99

Foil 6 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Layered
PSE
WebFlow
Object
Oriented
WebFlow
Data Flow
Custom
GUI
WebFlow Middle Tier
DATORR/Computing Portal API
Grid Forum API
HPCC: Globus
Other as needed
DBMS: JDBC
Small tasks: Java
user codes
https, IIOP/SECIOP
Example: DoD HPCMO ASC/ARL
Prototype Version
NCSA Alliance
Example: LMS
General or WebFlow Specific Authoring
Control (Small Messages)
Separated
from Data
HTML version of Basic Foils prepared October 24 99

Foil 7 PSE Layered User View (AT Team Dependent)

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Result Descriptor
Problem
Descriptor
Task Descriptor
Abstract Task Descriptor
Job Descriptor
User/Group Profile
Client Side User View
X M L
HTML version of Basic Foils prepared October 24 99

Foil 8 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Processing Task Specification
XML
WebFlow visual representation is converted into a XML
document
XML
service
Web
Server
save
parse
Application Context
Front-End Applet
Middle-Tier
Database
HTML version of Basic Foils prepared October 24 99

Foil 9 WebFlow Component Model

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
WebFlow system comprises a hierarchy of CORBA objects that implement interfaces defined by extending java.beans.beancontext (Java 1.2):
  • A WebFlowContext object implements an extended BeanContext interface. It maintains a persistent state, controls its children life-cycle, and is responsible for inter-JVM communications through a custom event model. The master ("root") context maintains a hierarchy of proxy objects to facilitate communication with clients implemented as Java applets without violating the sandbox restrictions.
  • A WebFlow Module implements BeanContextChild interface, is stateless (more precisely, it maintains a conversational state), and has access to all data maintained by its parent context.
Although implemented differently, conceptually close to EJB and CORBA 3 Components models.
  • Could convert to EJB Model
HTML version of Basic Foils prepared October 24 99

Foil 10 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
How does it work? CORBA-based Middle Tier (Proxy modules - a simplified example)
Front End
Middle Tier
Back End
host 1
host 3
CORBA object implemented in Java
CORBA client
HTML version of Basic Foils prepared October 24 99

Foil 11 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
kinit
generate TGT
locally
ticket cache
SECIOP
Applet
ORB.init()
invoke server methods
ORB
WebFlow modules
WebFlowServer
ORBAsec SL2 2.0
Java 1.1 plugin
HTML version of Basic Foils prepared October 24 99

Foil 12 WebFlow and Tango Events

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
HTML version of Basic Foils prepared October 24 99

Foil 13 WebFlow Events (1)

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
WebFlow components (modules) are developed independently of each other.
They can interact with each other through WebFlow events. (They can use remote invocation, but it requires the caller to have reference to the target module, which violates the WebFlow "module independence" rule).
There is only one type of WebFlow events. An event (same as a message) is a (self-describing) object that encapsulates data to be transferred from one module to another.
Each module can serve as a sink.
Event sources and sinks are associated at run time by the client invoking CORBA dynamic interfaces.
HTML version of Basic Foils prepared October 24 99

Foil 14 WebFlow Events (2)

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Method m
Client
B
Register event to correspond to linkage of modules in visual WebFlow diagram: "Let firing event e by module A
result in invocation of method m of module B"
Context 2
Module A does not care who is expecting the event; method fireEvent invokes a method of its parent context
Method m is a public method: anyone can invoke it, including the Event Adapter of Context 1. No protection against misuse!
Dynamic
Interfaces
A
B
HTML version of Basic Foils prepared October 24 99

Foil 15 Shared Event Collaboration Framework

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Objects register (using technology like Jini or that in WebFlow ) and then define their state or its change via a stream of events
Need to share (federate) events between domains (your PC, Supercomputer, PDA and mine) whose event services are normally isolated
"Tango or Habanero Server"
Object or Visual
Proxy for Object
Event specifying Object
or Change in Object
Federate and
Queue events
Clients which receive events which are either queued (asynchronous)
or processed synchronously
Pager, Cell Phone messages; Email;
Grid Status Messages
Collaboration Control Messages: e.g. New Participant Joined
W3C, Java Microsoft Client Events
e.g. Mouse Movements
HTML version of Basic Foils prepared October 24 99

Foil 16 XML Collaborative Web Page Architecture

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Content Server
Shared by Collaboration Infrastructure
W3C DOM Events
Trapped by Browser
Master
Nonmaster
HTML version of Basic Foils prepared October 24 99

Foil 17 Shared Form Illustrated by Shared Access to NCSA Biology Workbench showing how general server objects can be shared from web interface

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Shared Multiple List
Shared Buttons
Shared Text field
Shared Checkbox
Tango Interactive Shared Web Browser (in Shared Form Mode)
HTML version of Basic Foils prepared October 24 99

Foil 18 WebFlow Applications

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
HTML version of Basic Foils prepared October 24 99

Foil 19 WebFlow on Globus -- LMS at CEWES

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
WebFlow
server
WebFlow
server
WebFlow
server
EDYS
CASC2D
Data Retrieval
High Performance SubSystem
CASC2D
proxy
IIOP
Web Browser
Data Wizard
WMS interface
Toolbar
HTTP
WMS
File Transfer
File Transfer
GLOBUS
Internet
WebFlow modules
(back-end)
WebFlow
middle-tier
WebFlow applet
(front-end)
HTML version of Basic Foils prepared October 24 99

Foil 20 Example of a custom Web User Interface Land Management System

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Navigate and choose an existing application to solve the problem at hand. Import all necessary data.
Retrieve data
Pre/post-processing
Run simulations
Select host
Select model
Set parameters
Run
HTML version of Basic Foils prepared October 24 99

Foil 21 NCSA Quantum Simulations: Build Application from Components

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
HTML version of Basic Foils prepared October 24 99

Foil 22 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
disloc
ALARM
Dial Stations(and database)
GIPSY/auto_p
simplex
page
web simplex
Caltech
JPL
USGS
JPL
JPL
Boulder
(University of Colorado)
JPL
modem
page
quake location, size --
sorted station potential --
station raw files --
station motions --
WAKE UP!
single-fault model
--graphics
--hazard model
--graphics
--refined fault model
disloc
--maps for
civil authorities
JPL
Virtual_California
multi-fault model
page
disp
collaboration
HTML version of Basic Foils prepared October 24 99

Foil 23 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Collaboration in GEM
Earthquake Analysis System
HTML version of Basic Foils prepared October 24 99

Foil 24 Wrapping Existing Applications

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Currently each application is wrapped "by hand"
Users would like to automate the process -- "especially for simple jobs" -- need a Object Wrapping Wizard
Current XML Task Specification is at level of files
Will extend XML to include parameters so can automate construction of
  • Web Interfaces to input parameters with defaults etc. and create XML input file for job
  • Library for allow jobs to access parameters
<input>
<inFile Path="/npac/..../GEM/"
Name="disloc.output"/>
<source Host="osprey4.npac.syr.edu"
Path="/npac.../tmp" Name="disloc.out"/ >
</input>
<output> <outFile Path="" Name="" />
<dest Host="" Path="" Name="" />
</output>
Current Tool for creating Application Descriptor
HTML version of Basic Foils prepared October 24 99

Foil 25 Example IDL definition

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
module WebFlow {
module FileBrowser {
typedef sequence<string> FileList;
interface WFFileDescriptor {
Object getSource();
string getFileName();
string getFileDirectory();
string getFileHost();
string getFileAttribute();
void setFileName(in string Name);
void setFileDirectory(in string Name);
void setFileHost(in string Name);
void setFileAttribute(in string Name);
};
};
HTML version of Basic Foils prepared October 24 99

Foil 26 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
disloc
ALARM
Dial Stations(and database)
GIPSY/auto_p
simplex
page
web simplex
Caltech
JPL
USGS
JPL
JPL
Boulder
(University of Colorado)
JPL
modem
page
quake location, size --
sorted station potential --
station raw files --
station motions --
WAKE UP!
single-fault model
--graphics
--hazard model
--graphics
--refined fault model
disloc
--maps for
civil authorities
JPL
Virtual_California
multi-fault model
page
disp
collaboration
HTML version of Basic Foils prepared October 24 99

Foil 27 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Prepare Data
disloc proxy
Post Process
Generate disloc input
disloc proxy
disloc2simplex proxy
simplex proxy
compare
disloc code written in C
disloc2simplex script written in perl
simplex code written in C
Front End:
Java Applet.
CORBA client
Middle Tier:
distributed objects
implemented in Java.
CORBA servers
Back End:
computing
resources
Iterate
HTML version of Basic Foils prepared October 24 99

Foil 28 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
HTML version of Basic Foils prepared October 24 99

Foil 29 PPT Slide

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
<?xml version="1.0"?>
<!DOCTYPE application SYSTEM "ApplDescV2.dtd">
<application id="disloc">
<target id="osprey4.npac.syr.edu">
<status installed="Yes"/>
<installed>
<CmdLine command="/npac/home/webflow/GEM/JAY/dis2loc" />
<input>
<inFile Path="/npac/home/webflow/GEM/JAY/" Name="disloc.output"/>
<source Host="osprey4.npac.syr.edu" Path="/npac/home/Jigsaw/WWW/tmp"
Name="disloc.out"/ >
</input>
<output>
<outFile Path="/npac/home/webflow/GEM/JAY/" Name="simplex.input" />
<dest Host="osprey4.npac.syr.edu" Path="/npac/home/webflow/GEM/JAY/simplex/" Name="s.in" />
</output>
<stdout Host="aga.npac.syr.edu" Path="/npac/home/haupt/webflow/history/" Name="job2001.out" >
<stderr Host="aga.npac.syr.edu" Path="/tmp/" Name="haupt_job2001.err" >
</installed>
</target>
</application>
HTML version of Basic Foils prepared October 24 99

Foil 30 WebFlow on Globus -- LMS at CEWES

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
WebFlow
server
WebFlow
server
WebFlow
server
EDYS
CASC2D
Data Retrieval
High Performance SubSystem
CASC2D
proxy
IIOP
Web Browser
Data Wizard
WMS interface
Toolbar
HTTP
WMS
File Transfer
File Transfer
GLOBUS
Internet
WebFlow modules
(back-end)
WebFlow
middle-tier
WebFlow applet
(front-end)
HTML version of Basic Foils prepared October 24 99

Foil 31 Example of a custom Web User Interface Land Management System

From WebFlow and Friends for Education and Science Portals NCSA Portal/Metadata Meeting -- October 22-23 99. *
Full HTML Index
Navigate and choose an existing application to solve the problem at hand. Import all necessary data.
Retrieve data
Pre/post-processing
Run simulations
Select host
Select model
Set parameters
Run
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