WSRP

1
WSRP

• Brent Stearn
• Grid Development Group,
• SDSC Summer Institute
• 8/24/04

2
Motivation

• Portals are often static
• Portlet addition requires more development work
• Portlets are bound to the portal framework they
  are developed with
• No reusability
• Web based portals are typically limited to HTML
• An application portal would be able to
  accommodate much richer content

3
Topics

• WSRP
• Gamess portlet and demonstration

4
WSRP

• Web Services for Remote Portlets
• Designed to facilitate pluggable, presentation
  oriented portlets.
• Portlets can be written to any portlet api JSR
  168, Gridsphere, etc
• Portlets can also be web services
• Allows for richer types of markup
• HTML / XHTML,
• WML, cHTML, VoiceXML (In Future)
• WSRP uses the idea of a Producer and Consumer to
  define relationship between portlet host and
  portlet user

5
WSRP Models
P R O D U C E R
C O N S U M E R

B R O W S E R
Portal
HTML/JSP
SOAP

C O N S U M E R
P R O D U C E R
Application (Word, Outlook)
Web Service
6
Producer

• A Producer is the layer between portlets and the
  outside world
• It is NOT a runtime environment for portlets
• Depends on a portlet host for invocation
• Provides users with a mechanism for portlet
  discovery
• Gives access to information about a portlet
  hosts portlets

7
Consumer

• Interacts with a Producer to aggregate portlets
  and present them to the end-user
• Can be an application, a portal, a portlet, a web
  service, a jsp pagealmost anything
• Can utilize portlets from any Producer
• Only the Producers endpoint URL is needed
• Allows for possibility of richer content delivery
• Not limited by a web browser

8
GAMESS WSRP Demo

• Pluto - Portal
• WSRPRJ - Producer
• ProxyPortlet - Consumer
• Gamess - Portlet

9
Pluto

• Reference implementation of a JSR 168, the Java
  Portlet Specification
• Portlet container
• Where the portlets live
• Simple Portal
• User of the container

10
WSRP4J

• Open source implementation of WSRP Producer and
  Consumer
• The Producer component uses the Pluto container
  to host portlets
• Default consumer is a Java Swing based
  application

Google Portlet
Test Portlet
Embedded Server Portal
WSRP Interface
Test2 Portlet
Gamess Portlet
11
ProxyPortlet
Pluto

• Gamess portlet is hosted remotely by a WSRP4J
  Producer
• The local portal, pluto, does not implement a
  WSRP consumer interface
• ProxyPortlet is a WSRP Consumer that couples the
  portal to the producer
• The local portal sees only a normal portlet
• The portlet itself implements the WSRP consumer
  interface
• Any portlet hosted by a WSRP producer can then be
  plugged in and used by the portal without ever
  knowing about WSRP

C O N T A I N E R
C O N S U M E R
GooglePortlet
P O R T A L
Test Portlet
Test2 Portlet
Proxy Portlet
12
Gamess Portlet

• Hosted by WSRP4Js embedded Pluto container
• General Atomic and Molecular Electronic
  Structure System (GAMESS) is a general ab initio
  quantum chemistry package.

Gamess Portlet
13
Step 1
Pluto
WSRP4J
B R O W S E R
WSRP I N T E R F A C E
C O N T A I N E R
P O R T A L
P L U T O
Google
HTML
Test

HTTP
Gamess
User accesses the portal
14
Step 2
WSRP4J
Pluto
Markup
C O N T A I N E R
C O N S U M E R
P O R T A L
P R O D U C E R
P L U T O
Google
ServiceDescription
Test Portlet
Test
Registry
Test2 Portlet
Gamess
Management
Proxy Portlet
Portal presents links to Portlets. Remote
portlets (Gamess Test and Google) are represented
by ProxyPortlet. When selected, ProxyPortlet
aggregates its content.
15
Step 3
WSRP4J
Pluto
Markup
C O N T A I N E R
C O N S U M E R
P O R T A L
P R O D U C E R
GooglePortlet
P L U T O
Google
ServiceDescription
Test Portlet
Test
Registry
Test2 Portlet
Gamess
Management
Proxy Portlet
Information about the Producer is retrieved
16
Step 4
WSRP4J
Pluto
Markup
C O N T A I N E R
C O N S U M E R
P O R T A L
P R O D U C E R
P L U T O
Google
ServiceDescription
Test
Registry
Gamess
Management
Consumer registers with the Producer
17
Step 5
WSRP4J
Pluto
Markup
C O N T A I N E R
C O N S U M E R
P O R T A L
P R O D U C E R
P L U T O
Google
ServiceDescription
Test
Registry
Gamess
Management
More detailed information about the Producer And
its offered portlets is retrieved
18
Step 7
WSRP4J
Pluto
Markup
C O N T A I N E R
C O N S U M E R
P O R T A L
P R O D U C E R
P L U T O
Google
ServiceDescription

Test

Registry
Gamess
Management
Markup fragments of requested portlets are
returned
19
Step 8
Pluto
WSRP4J
B R O W S E R
WSRP I N T E R F A C E
C O N T A I N E R
GooglePortlet
P O R T A L
P L U T O
Google
Test Portlet
HTML
Test
Test2 Portlet
HTTP
Gamess
Proxy Portlet
Markup fragments are aggregated and presented
20
Conclusion

• WSRP
• Supports development of presentation with web
  service
• Complements JSR-168
• Communications between remote portlets ?
• WSRP-Coordination
• Richer content
• Growing community support
• Gridsphere, IBM, Oracle, BEA, uPortal, Exo portal
• Supporting other standards
• Possible adoption of WSRF (Web Service Resource
  Framework)for
• accessing stateful information

21
References

• WSRP
• http//www.oasis-open.org/committees/tc_home.php?w
  g_abbrevwsrp
• WSRP4J
• http//ws.apache.org/wsrp4j/
• Pluto
• http//portals.apache.org/pluto/