1. Some remarks on Portals and Web Services
NCSA All Hands May
PTLIU Laboratory for Community Grids
Geoffrey Fox
Computer Science, Informatics, Physics
Indiana University, Bloomington IN
11/11/2018
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2. Web Services in a Nutshell
Application or Content source
WSDL
Web Service
Ports: Messages to and from other web services, resources or users
Web Services codify a clear process for deploying distributed software components representing
Data and Information Sources (Sensors, Databases)
Computers
Application Software
System services (OGSA Open Grid Service Architecture)
Distributed Message Passing Model
We should be in some process of dividing applications into components and giving them an XML “skin” defining input and output ports (data, remote procedure calls)
WSDL Web Service Definition Language
11/11/2018
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3. Example of Application Web Services
Note Service model integrates sensors, sensor analysis, simulations and people
An Application Web Service is a capability used either by another service or by a user
It has input and output ports – data is from users, sensors or other services
Big services built hierarchically from “basic” services
Sensor Data as a Web service (WS)
Data Analysis WS
Sensor Management WS
Visualization WS
Simulation WS
Data Management WS
11/11/2018
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4. Application Web Services
Filter1 WS
Filter2 WS
Filter3 WS
Build as multiple Filter Web Services
Prog1 WS
Prog2 WS
Build as multiple interdisciplinary Programs
Data Analysis WS
Simulation WS
Visualization WS
Note Service model integrates sensors, sensor analysis, simulations and people
An Application Web Service is a capability used either by another service or by a user
It has input and output ports – data is from users, sensors or other services
Big services built hierarchically from “basic” services
Sensor Data as a Web service (WS)
Data Analysis WS
Sensor Management WS
Visualization WS
Simulation WS
Data Management WS
11/11/2018
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5. XML Specified Resources connected by XML Specified messages
XML Skin
XML Skin
Message
Or Event
Based
Inter Connection
Soft ware
Resource
Soft ware
Resource
Data
base
XML Specified Resources connected by XML Specified messages
Implementation of resource and
connection may or may not be XML
11/11/2018
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6. Web Services as a Portlet
Each Web Service naturally has a user interface specified as “just another port”
Customizable for universal access
This gives each Web Service a Portlet view specified (in XML as always) by WSRP (Web services for Remote Portals)
So component model for resources “automatically” gives a component model for user interfaces
When you build your application, you define portlet at same time
Application or Content source
WSDL
Web Service S R W P
Application as a WS General Application Ports Interface with other Web Services
User Face of Web Service WSRP Ports define WS as a Portlet
WSRP is Web Services for Remote Portals 1st Meeting OASIS March
11/11/2018
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7. Integration of Portlets
Portals integrate Portlets into a complete user interface
Apache Jetspeed seems good open source technology supporting this model
Application as a WS General Application Ports Interface with other Web Services
Client Render
Application or Content source
WSDL
Web Service
Portal User Profile Aggregate UI Fragments S R W P
Integrate Multiple Portlets User Customization at either Portal or if
complicated at WS
User Face of Web Service WSRP Ports define WS as a Portlet
11/11/2018
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8. Online Knowledge Center built from Portlets
A set of UI Components
Web Services provide a component model for the middleware (see large “common component architecture” effort in Dept. of Energy)
Should match each WSDL component with a corresponding user interface component
Thus one “must use” a component model for the portal with again an XML specification (portalML) of portal component
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9. Jetspeed Computing Portal: Choose Portlets
4 available portlets linking to Web Services I choose two
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10. Choose Portlet Layout Choose 1-column Layout Original 2-column Layout
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11. Two Computing Portlets
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