10 th Lecture COP 4991 COP 4991 Component-Based Software Development Component-Based Software Development Instructor: Masoud Sadjadi http://www.cs.fiu.edu/~sadjadi/ Teaching/ WSRF.NET WSRF.NET
10th Lecture
COP 4991 COP 4991 Component-Based Software DevelopmentComponent-Based Software Development
Instructor: Masoud Sadjadihttp://www.cs.fiu.edu/~sadjadi/Teaching/
WSRF.NETWSRF.NET
10th Lecture 2COP-4991: Component-Based Software Development
AcknowledgementAcknowledgement Fernando Trigoso
10th Lecture 3COP-4991: Component-Based Software Development
OutlineOutline WSRF.NET Architecture Attribute-based programming Compatibility with GT4 WSRF Issues
10th Lecture 4COP-4991: Component-Based Software Development
BackgroundBackground WSRF
– WS-Resource WS-ResourceProperties WS-ResourceLifetime
WS-Notification
10th Lecture 5COP-4991: Component-Based Software Development
WSRF.NETWSRF.NET Open source implementation of WSRF and WS-Notification Implements full set of specifications Useful to evaluate the WSRF approach To make programming WSRF.NET services as easy as
programming Web Services
10th Lecture 6COP-4991: Component-Based Software Development
WSRF.NET ArchitectureWSRF.NET Architecture
ISAPI Filter
Wrapper Web Service
Author’s Service
Imported port type functions
WS-Resource
WS-Resource
WS-Resource
WS-Resource
IIS ASP.NETWS-Resource
“Backend”
Internet Information Services (IIS) Internet Server Application Programming Interface (ISAPI)
Humphrey, M., & Wasson, G. (2004). Architectural Foundation of WSRF.NET.
10th Lecture 7COP-4991: Component-Based Software Development
WSRF.NET ArchitectureWSRF.NET Architecture
ISAPI Filter
Wrapper Web Service
Author’s Service
Imported port type functions
WS-Resource
WS-Resource
WS-Resource
WS-Resource
IIS ASP.NETWS-Resource
“Backend”
ASP.NET with Web Services Extensions (WSE) Wrapper Web Service automatically created by WSRF.NET
Humphrey, M., & Wasson, G. (2004). Architectural Foundation of WSRF.NET.
10th Lecture 8COP-4991: Component-Based Software Development
WSRF.NET ArchitectureWSRF.NET Architecture
ISAPI Filter
Wrapper Web Service
Author’s Service
Imported port type functions
WS-Resource
WS-Resource
WS-Resource
WS-Resource
IIS ASP.NETWS-Resource
“Backend”
WS-Resource implemented with ADO.NET Serialized result returned to client
Humphrey, M., & Wasson, G. (2004). Architectural Foundation of WSRF.NET.
10th Lecture 9COP-4991: Component-Based Software Development
WS-ResourceWS-Resource WS-Resource implementation Ability to query complex states Ease to access multiple resources Lookup based on key and state contents
Database
Wrapper
Author’s Web Service
State of Resource
10th Lecture 10COP-4991: Component-Based Software Development
WS-ResourceWS-Resource Portability, scalability and flexibility No single-point of failure Efficient expiration check Provides an interface for customization
Database
Wrapper
Author’s Web Service
State of Resource
10th Lecture 11COP-4991: Component-Based Software Development
OutlineOutline WSRF.NET Architecture Attribute-based programming Compatibility with GT4 WSRF Issues
10th Lecture 12COP-4991: Component-Based Software Development
Declarative & ImperativeDeclarative & Imperative Imperative programming
– Most common– Methods define behavior of programs
Declarative programming– Declarations define behavior– No need to write instructions– Attributes are used to define behavior
Wagner, B. (2005). Effective C#.
[WebMethod]public string Hello(){return “Hello World”;}
10th Lecture 13COP-4991: Component-Based Software Development
WSRF.NET Attribute UsageWSRF.NET Attribute Usage Attributes easily define:
– Resources– Resource Properties– Port Types
Aids development of grid services
10th Lecture 14COP-4991: Component-Based Software Development
Attributes for Web ServiceAttributes for Web Service
[WebMethod]public string Hello(){
return “Hello World”;}
[WebMethod]public DateTime GetDate(){
return DateTime.Now;}
Used to create the service logic ASP.NET creates:
– WSDL document– Support to route SOAP requests– HTML pages to test web service
Security provided by WSE
10th Lecture 15COP-4991: Component-Based Software Development
Attributes for Stateful Attributes for Stateful ResourceResource
class PackageService{
[Resource]Package pkg;
[Resource]PkgRoute route;
[Resource]PkgLocation location;
…
WS-Resource is an abstraction for a collection of state
WS-Resource addressed by EPR Resource is the collection of
members with [Resource] attribute
Wasson, G. (2006). WSRF.NET 3.0 Programmer’s Reference.
10th Lecture 16COP-4991: Component-Based Software Development
Attributes for Stateful Attributes for Stateful ResourceResource
class PackageService{
[Resource]Package pkg;
[Resource]PkgRoute route;
[Resource]PkgLocation location;
…
Resource stored in the database with key:
– URL + Resource Unique ID EPR in SOAP message contains:
– <Address> + <ReferenceProperties>
Resource loaded from database Values placed in web service’s
members
Wasson, G. (2006). WSRF.NET 3.0 Programmer’s Reference.
10th Lecture 17COP-4991: Component-Based Software Development
Attributes for Stateful Attributes for Stateful ResourceResource
class PackageService{
[Resource]Package pkg;
[Resource]PkgRoute route;
[Resource]PkgLocation location;
…
WSRF.NET allows customization Just implement IResource Not all web methods require all
values
Wasson, G. (2006). WSRF.NET 3.0 Programmer’s Reference.
10th Lecture 18COP-4991: Component-Based Software Development
Attributes for Resource PropertiesAttributes for Resource Properties
class PackageService{
[Resource]Package pkg;
[ResourceProperty]public string Sender{ get {
return pkg.Sender; }}
…
Resources described in Resource Property Document (RPD)
RPD is composed of ResourceProperties
All members with [ResourceProperty] define RPD
Wasson, G. (2006). WSRF.NET 3.0 Programmer’s Reference.
10th Lecture 19COP-4991: Component-Based Software Development
Adding Port Types to the ServiceAdding Port Types to the Service[WSRFPortType(typeof(GetResourcePropertyPortType))][WSRFPortType(typeof(ImmediateResourceTerminationPortType))]public class PackageService{
[Resource]Package pkg;
…
WSRF defines functions that may be supported WSRF.NET implements all current specifications Author’s can reuse them by declaring attributes
Wasson, G. (2006). WSRF.NET 3.0 Programmer’s Reference.
10th Lecture 20COP-4991: Component-Based Software Development
OutlineOutline WSRF.NET Architecture Attribute-based programming Compatibility with GT4 WSRF Issues
10th Lecture 21COP-4991: Component-Based Software Development
Compatibility with GT4Compatibility with GT4 GT4 uses a different version of WS-Addressing than WSE
3.0 WSRF.NET makes process transparent GT4 clients can interact with WSRF.NET services and vice
versa (being tested) WSRF.NET cannot send Notifications to both GT4 and
WSE 3 services at the same time
10th Lecture 22COP-4991: Component-Based Software Development
WSRF.NET & GT4WSRF.NET & GT4
B. Sotomayor and L. Childers. Globus Toolkit 4, Programming Java Services. 2006.
10th Lecture 23COP-4991: Component-Based Software Development
OutlineOutline WSRF.NET Architecture Attribute-based programming Compatibility with GT4 WSRF Issues
10th Lecture 24COP-4991: Component-Based Software Development
Stateful vs. StatelessStateful vs. Stateless Service Oriented Architecture
– Combines loosely coupled and interoperable services State clashes with Services Architecture Bond between client and service
– Loose coupling with stateless services– Tighter coupling with stateful services
Proxies mask services as objects
10th Lecture 25COP-4991: Component-Based Software Development
Complexity of Service-Side Complexity of Service-Side CodeCode
Importing port types may raise issues– Port types have their own resources
The state and its Resource Property– If one changes the other one has to change
Unintuitive interface:
// No WSRF:
CheckPackageIn(Package pkg, string location)
// WSRF:
CheckPackageIn(string location)
Humphrey, M., & Wasson, G. (2004). Architectural Foundation of WSRF.NET.
10th Lecture 26COP-4991: Component-Based Software Development
ConclusionConclusion WSRF.NET architecture Complex application logic requires complex infrastructure WSRF potential is strong Decoupling will be difficult WSRF.NET helps WSRF
10th Lecture 27COP-4991: Component-Based Software Development
ReferencesReferences Architectural Foundations of WSRF.NET by M. Humphrey
and G. Wason. The Open Grid Services Architecture, Version 1.0. I.
Foster, H. Kishimoto, A. Savva, D. Berry, A. Djaoui, A. Grimshaw, B. Horn, F. Maciel, F. Siebenlist, R. Subramaniam, J. Treadwell, J. Von Reich. Informational Document, Global Grid Forum (GGF), January 29, 2005.