1 WebSphere ESB Best Practices WebSphere User Group, Edinburgh 17 th September 2008 Andrew Ferrier, IBM Software Services for WebSphere Contributions from: Russell Butek André Tost
2 Agenda Brief Refresher of WebSphere ESB Large-scale Best Practices: Design and architecture Small-scale Best Practices: Hints and tips to make your life easier References and Further Information
3 Brief Refresher of WebSphere ESB
4 What is WebSphere ESB? An ESB (Enterprise Service Bus) is an architectural pattern that assists in creating an SOA environment. Enables routing, transformation, augmentation, aggregation, etc. of services by creating intermediary services. Service Consumers ESB Service Providers WebSphere ESB is one of IBM s three ESB products.
5 WebSphere SOA/Process Integration Stack WebSphere Process Server WebSphere ESB Process Choreography, Business Logic Message Transformation, Augmentation, Routing WebSphere Integration Developer (tooling) WebSphere Application Server J2EE Application Hosting, Supporting Services
6 Mediation Module and Flow SCA Component (WSDL) Interface WPS adds Process (or Integration) modules. Mediation Modules can also contain Java Components. Mediation Modules can reference libraries that contain WSDLs, BOs, etc.
7 Types of Import and Export (Bindings) Web Services (SOAP/HTTP and SOAP/JMS) Messaging: WebSphere MQ and MQ / JMS JMS (incl. Generic) HTTP JCA (WebSphere) Adapters Application Technology SCA Default / Native Stateless Session Bean Binding (import only) Standalone Reference (export only) WebSphere Business Integration Adapters
8 Service Data Object (SDO) Java API used for accessing (mostly) structured data. Has serialized XML representation. DataObject customer = createcustomer(); customer.setstring( name, Fred ); customer.setstring( address, 123 Anytown ); customer.setdate( dateofbirth, new Date(1975, 2, 1)); customer.setyearsacustomer(0); <customer> <name>fred</name> <address>123 Anytown</address> <date> </date> <yearsacustomer>0</yearsacustomer> </customer> Business Object is definition / type of SDO (underlying representation is XML Schema).
9 Service Message Object Only used inside mediation flows Contains context (scratchpads) for various mediation functions Gives access to headers inaccessible in other SCA components As well as message body content
10 Large-scale best practices: Design and architecture Use the Right Type of Module Design your System Topology Spend Time on Interfaces and Business Objects Consider How you Split up Mediation Modules Select your Binding Types Carefully Document Modules and Components Consider your Custom Coding Strategy Consider your Logging Strategy Use Source Control & Do Automated Builds Do Unit Testing
11 Use the Right Type of Module Think about mediation logic vs. process logic. Use Mediation Modules (WebSphere ESB & Process Server) for integration / mediation logic: Short-running, minimal choreography. Supports header manipulation. Use (Integration) Modules (WebSphere Process Server only) for business / process logic: Can be long-running, powerful choreography and business logic. More Information: es/0803_fasbinder2/0803_fasbinder2.html
12 Design your System Topology Need more than one server? Using clustering? For scalability? For failover? Choice of topology Bronze, Silver, Gold, Mediation Modules on their own server? What databases do you need? Need a load balancer / HTTP server? What other systems are you connecting to and how will they ensure failover / scalability? DeveloperWorks article on clustering: 803_chilanti/0803_chilanti.html Redbook that discusses production topologies:
13 Spend Time on Interfaces and Business Objects Refactoring support is limited inside mediation flows, so good to get this right first time round. Adopt a naming convention. Add constraints? Add modelled faults? Think about namespaces. Configure default namespace policy before you start.
14 Consider How you Split up Mediation Modules How many mediation flows inside each mediation flow component? Large number of modules impacts performance / deployment. Module A Module B Module A Module B Library C build Library C Library C Application A Application B Small number impacts ease of development. Remove unused library content.
15 Select your Binding Types Carefully Often binding type dictated by circumstance. But if you have the scope to decide: Prefer SCA default/native for inter-esb/wps communications fast, efficient, and simple Prefer Web Services for synchronous service exposure mature, integrates well into SDO model. Prefer JMS for asynchronous service exposure integrates well with WAS platform. Sometimes you have alternatives. For example: Web Services binding allows easy access to SOAP headers or HTTP with SOAP data binding allows access to HTTP headers but not SOAP headers
16 Document Modules and Components (1/2) Specify description property to describe component in WID: As of WID 6.1.2, can also add notes:
17 Document Modules and Components (2/2) Can use Generate Documentation to generate a full PDF describing your module:
18 Consider your Custom Coding Strategy Custom mediation: Most useful for one-off coding. Cannot be re-used between modules. Visual mode available which may be useful to those less comfortable with Java/SDO API. Custom primitive (also called roll-your-own primitive): A first-class new primitive same abilities as any other primitive type (XSLT, Endpoint Lookup ). Can have customisable properties. Appears in palette in WID. More re-usable, but more work to create.
19 Consider your Logging Strategy You will want one, consider it before you start developing. Options include: Message Logger limited functionality logs only to a fixed schema database table. JDBC or Flat File Adapter (in separate mediation module?) Custom mediations basic visual snippets for logging. Custom primitives.
20 Use Source Control & Do Automated Builds Use source control WID/Eclipse integrates with several. Only one developer per mediation module at once. Automated build direct from source control. WebSphere ESB is supplied with the servicedeploy tool for this purpose. Article gives a good example of this process, integrate with Rational ClearCase: y/techarticles/0711_manekar/0711_manekar.html
21 Do Unit Testing As of version 6.1, WebSphere Integration Developer has support for unit testing. Use it before check-in. Can be run from command line as part of automation. Article with more information: works/websphere/library/techa rticles/0806_gregory/0806_gre gory.html
22 Small-scale Best Practices: Hints and tips to make your life easier Handle Modelled Faults Handle Unmodelled Faults where Appropriate Understand your Message Manipulation Choices Promote Properties where Relevant Use Visual Snippets in Custom Mediations Use Correct Message Context Understand the Synchronicity of Invocations Understand the Transactionality of Components Use Data Bindings (and Data Handlers) properly Use the Range of Debugging Tools Available
23 Handle Modelled Faults a.k.a business or checked Don t ignore them consider them to be like declared faults in Java. Log it, then depending on nature of fault: Business level fault: pass it on Mediation does not include business logic Maybe do transformation Infrastructure level fault: Pass it on: Mediate into a generic fault for business logic Or deal with it: Retry?
24 Handle Unmodelled Faults where Appropriate Aren t declared on an interface. a.k.a. system, runtime or unchecked. Appear at fail terminal of the callout node in the response flow Failure message found in SMO context. Useful where: Interacting with a system that throws runtime faults that you want to capture. Interacting with an interface that hasn t declared faults, but should have. Façading approach: rks/websphere/library/techarticles /0802_lezajic/0802_lezajic.html
25 Understand your Message Manipulation Choices Message Element Setter simple, high performance. Cannot alter message type. Parts of element map are directly promotable. XSLT prefer XSLT when you want to use XML functions or work with XSLT directly. Also more performant in some cases such as when working with Web Services (but test performance!) BO Map if want to share BO maps with WPS, or need/want ordering capabilities of the BO mapper:
26 Promote Properties where Relevant Link them with the same name, where relevant, so that they can be changed together Be aware that there is a minor performance penalty so don t promote with abandon, particularly where performance is a concern.
27 Use Visual Snippets in Custom Mediations
28 Use Correct Message Context Use Message Context area appropriate for inter-primitive communication: correlation scratchpad for communicating between request and response flows. transient scratchpad within a flow. primitivecontext/ FanOutContext used when iterating using the Fan Out / In primitives. shared used to aggregate responses from Service Invokes during a Fan Out / In. More information: works/webservices/library/wswebsphereesb3/index.html?ca =drs-
29 Understand the Synchronicity of Invocations Default invocation style sometimes dictated by bindings. Often OK but be aware of it. Async interactions (between components or modules) go via an SCA queue. Implies: Breaking transactional scope Runtime exception, after retry limit, roll onto exception destination. Handling method depends on product: WPS has Failed Event Manager WESB needs an app/human to read errors from system exception destination, or exception destination to be disabled Can be hard to predict when interactions will be async subtleties in performance optimisation, etc. Assume async if in doubt, and use preferredinteractionstyle liberally. More details here:
30 Understand the Transactionality of Components Affects what happens when errors occur. If you are interacting with JDBC or a messaging system probably want transactionality. Not the default. Use the new Transaction Highlighting and Qualifiers editor in WID More information: com/2008/07/31/transactionalit y-in-sca-part-2-refactoringinterfaces/
31 Use Data Bindings (and Data Handlers) properly Data Bindings (and Data Handlers) should be used on the boundaries of a set of modules to transform from and to proprietary formats. Don t use the simple JMS and MQ bindings, then do the work of a data bindings in a mediation module: Unnecessarily complicates the flow Reduces opportunity for reuse with data handlers Only use the simple data bindings sparingly.
32 Use the Range of Debugging Tools Available (1/2) Re-run your unit tests so you know what s failing. Review the content of application and server logs (such as SystemOut.log). Read the whole stack trace. Add more logging / increase logging levels.
33 Use the Range of Debugging Tools Available (2/2) Use Component Test Client New fine-grained trace in WID Use Debugger Supports Breakpoints, Step Over, Inspection of SMO, etc.
34 Large-scale best practices: Design and architecture Use the Right Type of Module Design your System Topology Spend Time on Interfaces and Business Objects Consider How you Split up Mediation Modules Select your Binding Types Carefully Document Modules and Components Consider your Custom Coding Strategy Consider your Logging Strategy Use Source Control & Do Automated Builds Do Unit Testing
35 Small-scale Best Practices: Hints and tips to make your life easier Handle Modelled Faults Handle Unmodelled Faults where Appropriate Understand your Message Manipulation Choices Promote Properties where Relevant Use Visual Snippets in Custom Mediations Use Correct Message Context Understand the Synchronicity of Invocations Understand the Transactionality of Components Use Data Bindings (and Data Handlers) properly Use the Range of Debugging Tools Available
36 References and Further Information Andrew Ferrier InfoCenter: WebSphere ESB Support Site: WebSphere ESB on DeveloperWorks: wesb.html SOA Tips n Tricks Blog:
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