Web Services Development Environment

Web ServicesDevelopment Environment

CNT5715 Fall 2010Computer Network Programming

S. Mansfield

09/09/2010 Web Services Development Environment 2

Agenda

Application of Web Services

Web Services Application Example

The OSI Model and Web Services

Web Services Development Flow

Web Services Tool Chain

WSDL Example

Web Service Example

Advanced Topic: Mobile Web Services


Application of Web Services

Development of started around 1999

Focus was web centric services and applications

Far Reaching – Any Operating System, Any Language, Any HardwareIts really a communications architectureSimple application programming centric – Looks like classesLeverages TCP/IP infrastructure

Initially Over Hyped – Complex, many standards, technology hurdles

Key Standards Settled 2005

1st Decade Mergers and Acquisitions Drove Initial AdoptionMany disperse companies – All different IT SolutionsIntegrated many systems into one

Legacy Application MigrationFederal Government – Social SecurityDepartment of Defense – Procurement

Many Emerging Web Services Applications

Expanding into New Areas – Cloud Computing


The OSI Model & Web Services

Application

Presentation

Session

Transport

Datalink

Network

Physical

OSI Model

Device Driver&

Hardware

Ipv4, IPv6

OthersTCP UDP

Application

Internet ProtocolSuite

Device Driver&

Hardware

Ipv4, IPv6

TCP

Web Services

Application

Web ServicesModel

Who Is Using Web Services?

SOA/WS Markets & Solutions(Forrester)

Wide Adoption Across Public, Education & Private SectorsExcellent Vendor Development & Tool SupportSupports New & Legacy EnvironmentsExcellent Architecture for Mobile Data Delivery

Public & Private Sector Growth(Gartner)

Universal in Europe, Rapidly Growing in the USA2007 – 50%> All New Large System Deployments Used SOA2010 – 80%> All New Large System Deployments Will Use SOA

Industry Examples(CIO)

Synovus – Commercial/Retail/ Investment BankingT-Mobile – Re-engineered IT Solutions using SOA Dell – Integrated WW Mfg & Delivery System with 3rd PartiesTwitter – Fully integrated SOA Service Delivery ModelLinkedin – Integrated Internal Amazon – Integrated SOA Business ModeleBay – Integrated SOA Business ModelFedEx – Integrated SOA Business ModelFord Motor Company – Integrated WW Supplier SOA NetworkStarwood Hotels – Replace Multiple Legacy Systems with One SOA SystemVerizon- Merged Multiple Legacy Acquisition CompaniesCitGroup – Integrated SOA Top/Down Throughout BusinessMotorola – Integrated 180 Separate Business GroupsFederal Government – Published Comprehensive SOA RoadmapUS Army – Replacing All Legacy Systems with SOADoD – Created Target SOA Architecture, Successfully Deploy Pilot ProgramsVeterans Administration – Plans to Migrate All Systems to SOASeveral States Migrating to SOA – AZ, IA, MA, UT, TX, WA

Web ServicesClient

Application


Web Service Application

Web Services Based Travel Web Site

Airlines -- Delta

Hotels -- Marriot

Automobiles -- Hertz

Travel Services -- Sabre

RDMS

TravelCustomers

Before WS – Many 100’s Klocs With WS – Few 10’s Klocs Much Faster Development Much Less Cost Much Less Testing World Wide 24/7 Access

Web Browser

Web Browser

Web Browser


UDDI

WSClient

WSServer

WSServer

WSServer

WSDL

WSDL

WSDL

The SOA Composite Map

BPEL

WSCI

UDDI – Universal Description, Discovery, and Integration

Universal phone book for Web Services White Pages: Direct contact information Yellow Pages: Business Description Green Pages: Technical Information

WSDL – Web Service Description Language

Describes the complete server operation,interface, protocols, and web ports.

BEPL – Business Execution Process Language

BPEL is the industry standard for business processorchestration. It is an XML-based language usedfor the definition and execution of businessprocesses as well as scientific workflowsusing Web services.

WSCI – Web Services Choreography Interface

A form of service composition in which theinteraction protocol between several partnerservices is defined from a global perspective


Web Services Development Environment

Web Service Server

RDBSFramework•Java•.Net

JavaRDBMS

Application

WS EndpointInterface

WS EndpointPublisher

WSDL wsimport

Web ServiceClient

Application

JSE 6 .jarjavax.jwsjavax.xml.wsjavax.xml.rpcjavax.xml.soapjavax.xml.bind

WS AttributeClasses

Java EnterpriseEnvironment

InternetJava Client

Environment

• Java Web Services Development Environment• Fully Integrated Framework and Utilities• End to End Enterprise/Client Communications


The WSDL

Port

Service

Binding

Input

OutputOperation

PortType

Message

Types

Ab

str

ac

t S

ec

tio

nC

on

cre

te S

ec

tio

n

WSDL 1.1WSDL the most important component of Web Services

Describes what the Web Services does and howFunctionsData typesProtocolsWhere to find service

The WSDL actually describes server classesClass nameClass methodsClass properties

The server has real objects and the client creates abstract interfaces

When either class is invoked the underlying SOAP response/requestcreates method calls and updates (synchronizes) the class properties

Extremely powerful seem-less communications architecture

Maximum flexibility with no exposure to underlying communications methods

End-to-End Type Safe

Underlying programming model is all Sockets TCP/IP bases

Very strong tool support -- automatic client abstract interface class generation (wsimport)


PortType Class { }

Operation Method()

Message Property Type

Msg Name Property Name

Types Property Attributes

Binding Message Protocol

Service Server Location

Definitions

Target NamespaceWSDL XML Schema

WSDL Structure


Web Services Platform Architecture

RequestSOAP

ResponseSOAP

Serv

ice

Endp

oint

In

terf

ace

Prox

y

Parameter

class {}

method()

Parameter

return

method()

Parameter

return

Invocation Subsystem(Client Side)

RequestSOAP

ResponseSOAP

Parameter

Parameter

return

Parameter

return

Invocation Subsystem(Server Side)

Parameter

class {}

method()

Parameter

return

method()

Parameter

return

ClientAbstractInterface

ServerTargetObject

Synchronization – Serialization -- Transmission Transmission – Serialization -- Synchronization

SOAP MessageExchange

(Specified by WSDL

MethodInvocation

MethodInvocation

Annotate & Publish ObjectsCreate Abstract Classes with wsimport


wsimport/wsexport

WSDL wsimportfclass1 { method1() prop1 method2() prop2}

fclass1 { method1() prop1 method2() prop2}

object factory

service{ }

getClass1 { getprop1() getprop2()}

setClass1 { setprop1() setprop2()}

• Extracts WSDL

• Creates XML Schemas

• Compiles Attribute Classes

objectfactory class { }fmethods()getprop()setprop()

• Error Handling

• Multi-Threaded

Server Client


WSDL wsimportwsexport

WSDL First Code First

(Server) (Client)

attributeclasses { }

end Implementation

Interfaces { }

Three Design Models• Code First• WSDL First• Code-WSDL First

Code Server Side Business ImplCreate Server Side EIC’s

Publish WSDLCompile WSDL Client Attribute Classes

Write WSDLCompile Server Side EIC’s

Code Server Side Business ImplCompile WSDL Client Attribute Classes

Who’s First Debate

+ Stable Server Side Code- Less Stable Client Code- Difficult to Read WSDL- Cross Platform Compatibility

+ Very Stable Clients+ Easy to Read WSDL- WSDL Syntax Interoperability- Less Stable Server Side Code


Web Services Tool Chain

Web Service Server


JavaRDBMS

Application



WSDL wsimport

Web ServiceClient

Application

JSE 6 .jarjavax.jwsjavax.xml.wsjavax.xml.rpcjavax.xml.soapjavax.xml.bind

WS AttributeClasses


A WSDL Example: .NET TimeServer

Display WSDL on Internet Browser

Examine Structure of WSDL

Extract WSDL and Create Client Attribute Classes


A Simple Web Services Example: TimeServer Execution in Java

Compile TimeServer Server

Create Server Proxy on Local Host

Compile TimeServer Client

Exchange Data between Client and Local Host Server


Advanced Web Service Example: Amazon Web Service Client

Extract WSDL and Create Attribute Classes

Compile and Link Client Program with Attribute Classes

Execute Amazon Web Service – Book Search


Advanced Web Services Topic: Mobile Web Services

Web Service


JavaRDBMS

Application



WSDL wsimport Proc beansxml Abst

Java .jarsjavax.jwsjavax.xmlothes...

AndroidJava WS

Client

kSOAP2

Missing ToolComponents

Android Web Services Development Environment

Figure 1

Missing LibraryComponents

04/21/23 COT6905 Directed Independent Study 19

awsimportWSDL Android WSAttribute Classes

AndroidClient

Application

AndroidPlatform

Android WSLibrary

kSOAP2Library

Initial Android SOA Development Environment

Proposed WS Environment• Quick demonstration platform• Android specific environment• New wsimport awsimport• Creates Android attribute classes• New Android WS Library• Utilizes kSOAP2 Libraries


Mobile OSPlatforms

Android

Apple iOS

Blackberry OS

BREW/REX

Palm OS

Symbian

Windows Mobile

ProgrammingLanguages

Java

Objective C/C++

Java

C/C++, Java

C/C++, Java

C/C++, Java

C++, C#, VB


Embedded OSPlatforms

VXWorks

Win Embedded

Red Hat Linux

DSP/BIOS

QNX

pSOS

eCOS

ProgrammingLanguages

Asm, C

Asm,C, C#, VB

Asm, C, C++

Asm, C

Asm, C

Asm, C

Asm, C


WSDL mwsimport Libraries

Android

Symbian

Blackberry OS

iOSIDE Plug In’s

Android

Symbian

Blackberry OS

iOS

Mobile WSAttribute Classes

MobileClient

Application

MobilePlatform

Mobile SOA DevelopmentEnvironment

Mobile SOA Environment• Fully W3C Compliant• WSDL-to-Code Environment• Multiple Platform Support• mwsimport virtual compiler• Platform Specific IDE Plug-In’s• Platform Specific Libraries

Emerging Android WS Architecture

ExtractedWSDL

ExtractedWSDL

PseudoClass

Builder

PlatformClass

Compiler

WSDLObjectFactory

PlatformLibrary

PlatformWeb Service

Client

PlatformSupport

Environment

WSDL

Common Code Modules

Code Re-Use Modules

Platform Specific Client

Limited Resource Client Web ServiceDevelopment platform


Pseudo Class Builder

WSDL ParseportType

Class1

Class2

Classm

Parse Operation

Method11()

Method12()

Method1n()

ParseMessage

Element11

ParseElement

Type

Bind I/O & Protocols

Method11()

Method12()

Method1n()

Define service Ports

Method11()

Method12()

Method1n()

PseudoClass

ArrayList

Class1

Class2

Classm

Abstract Classes

Concrete Classes

ParseElement

Type

ParseElement

Type

Element12

Element1o

Pseudo Class Builder (WSDL 1.1/1.2) Decomposes WSDL Creates & Defines Classes & Methods Defines Elements & Types Builds Pseudo Classes

Figure 12.


Platform Class Factory

PseudoClass

NewclassName

Constructor { Build class }

Method1()MarshalSOAPObject

IssueSOAPRPC

Set(element) Element

MessageOK

MessageError

PostError

Return

PseudoClass

NewclassName

Constructor { Build class }

Method1()MarshalSOAPObject

IssueSOAPRPC

Get(element) element

MessageOK

MessageError

PostError

DeserializeSOAPObject

WS Input(Output from WS Client)

WS Output(Input from WS Client)

UpdateElements

Return

Object Factory

Class1{}Class2{}Class3{}...

Service.language.source

Platform Class Factory

Figure 13.


HttpTransportHttpTransportBasicAuth

HttpTransportSE

MarshalBase64MarshalDateMarshalFloat

MarshalHashtable

ServiceConnectionServiceConnectionMidpServiceConnectionSE

SoapEnvelopeSoapFault

SoapObjectSoapPrimative

KvmSerializableSoapSerialization

SoapServlet

Transport

Platform Library

Interface for custom Serialization/Deserialization

Basic classes required for handling SOAPEnvelopes and literal XML content.

Methods to facilitate SOAP calls over HTTP using the J2ME generic connection framework.

Interface to allow the abstraction of the rawtransport information.

Provides get and set methods for properties. Canbe used to replace reflection for serialization aware classes.

Abstract class which holds common methods and members that are used by the transport layers.

ClassesDescription


Backup


WSDL 2.0 Structure

<description> -- XML target namespaces

<documentation> -- Simple text description of the WSDL WS</documentation>

<types> -- Describes the message and message types used in the WSDL</types>

<interface> -- Defines the interface of a WS as a set of abstract operations</interface>

<binding> -- A binding specifies concrete message format and transmission protocol details for an interface and fault in the operation

</binding>

<service> -- Describes a single interface that the service will support and describes al list of endpoints where the service can be found

</service>

</description>

Documents

Web Services Development Environment