About This Course • Discuss several SOA requirements that can be addressed using a Service Bus • Explain the relationships between WSDL, XPath, XQuery, and ALSB • List some of the capabilities of an OSB Proxy Service • Describe the process of how OSB is configured and managed
Target Audience • Anyone evaluating Service Bus technologies • SOA project team members: • • • •
Project Managers Enterprise and Project Architects Service Developers System Administrators
• Prior knowledge of fundamental SOA concepts recommended
Roadmap 1. Enterprise Service Bus • • •
Service Enablement Service Orchestration OSB Architecture
2. Service Bus Technologies 3. Proxy Service Development 4. Service Management and Monitoring
Why a Service Bus? • The Point-to-Point problem
Service
Application
Database
Service Application
EJB
Application SOAP
Service
Service
Service
Service SOAP
SAP
Location Transparency • Isolate from changes to service location
Service Bus New Hire Process
SOAP
HostA SOAP
Route to HostB
Initialize Benefits Service
HostB Initialize Benefits Service
Backwards Compatibility • Isolate from changes to service contract/interface
Customer Portal
CSR App
SOAP
Service Bus Transform Message
SOAP
Process Order Service 1.0 2.0
Service Enablement • Allow multiple protocols/messages to participate in a SOA Service Bus Expense Reimbursement Process
SOAP
JMS Transform
Payroll Service FTP Submit Expense Report Service
Transform Inventory Management App
JMS
Transform
SOAP Check Order Status Service
Dynamic Routing • Use business rules to determine destination service
Service Bus
SOAP HR Portal
Title = Manger?
SOAP Transform
New Employee Service New Manager Service
Message Enrichment • Update message using the response from another service ... ...
Service Bus Insurance Portal
Call Service
Transform Message
Get Customer History Service
Rate Quote Service
Service Orchestration • Compose new services from existing ones
Service Bus SOAP
1 Purchase Order Process
SOAP
Validate Order Service
2 4
3
Account Validation Service Check Price Service Check Inventory Service
OSB to the Rescue Oracle Service Bus Service Monitoring
Service Management
Dashboard
Discovery
SLA Alerts
Change Mgmt.
Reporting
Service Security Authentication Authorization Message Security
Import/Export Message Broker
Content Based Routing
Dynamic Transformations
Error Handling
Oracle WebLogic Server Oracle JRockit JVM
Multiple Protocols
Service Bus Quiz
Roadmap 1. Enterprise Service Bus 2. Service Bus Technologies • •
Web Service Fundamentals XML Fundamentals
3. Proxy Service Development 4. Service Management and Monitoring
Web Service Description Language (WSDL) • Is an XML document • Generated by tools • Acts as a Web Service contract: • • • •
Elements Operations Bindings Ports ("endpoints")
Employee
getEmployeeDept()
Department
getAllDepts()
SOAPEmployeeService
http://services.bea.com/employeeservice
Simple Object Access Protocol (SOAP) • • • •
Is a remote function protocol based on XML Used to invoke Web Services Wraps messages in an envelope protocol Supports headers and attachments Communications Envelope (HTTP, SMTP, FTP, etc.) Client Application
SOAP Envelope
Service
SOAP Attachments
Universal Description, Discovery, and Integration (UDDI) • Metadata structure to classify and catalog services • SOAP interface to communicate with a service registry ("digital telephone book")
Service Development & Management Tools
Publish Service Discover Service SOAP
Service Registry WSDL + metadata WSDL + metadata
XML Schema • • • •
Defines the structure of other XML documents Is itself an XML document Allows for faster message validation and processing Has a unique ID called a namespace ... 1 011
XPath • Is a standard XML expression language • Used to identify or locate portions of an XML document • Attributes • Elements //PurchaseOrder/Item/@line
//PurchaseOrder/Item/price
49.99 3 9.49 1 1 011
XQuery • Structured language for working with XML documents: • • • •
• Supports XPath return for $item in //PurchaseOrder/Item order by $item/title return {$item/price} return
49.99 9.49
Extensible Stylesheet Language Transformations (XSLT) • Alternative to XQuery for XML transformations: • Loosely typed scripting language • Does not require XML Schema • More tolerant of malformed XML
• Supports XPath
49.99 9.49
Service Bus Technologies Quiz
Roadmap 1. Enterprise Service Bus 2. Service Bus Technologies 3. Proxy Service Development • • • •
Update/replace/delete message contents Update message headers Call another service Action Raise error on client Generate a report or alert Invoke a Java class or EJB
• Error handlers
Pipeline
Transformations • XML to XML (XQuery or XSLT) • XML to Text/Binary (XQuery) • Binary to Binary (MFL)
Dependency Tracking • Select an artifact • View References
Demonstration: Create a Proxy Service Proxy Service approveLoan() > $10,000?
Y
N Transform Message
Business Service
ProcessLoan approveLoan()
Business Service
ProcessLargeLoan approveLoan()
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Proxy Service Development Quiz
Roadmap 1. 2. 3. 4.
Enterprise Service Bus Service Bus Technologies Proxy Service Development Service Management and Monitoring • • • • •
