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Web Services Best Practices 072604.ppt
1.
IBM Software Services
for WebSphere © 2003, 2004I BM Corporation Web Services Best Practices Rachel Reinitz, Sr. Certified IT Specialist., ISSW Co-Author Kyle Brown, Senior Technical Staff Member, ISSW Contributions from Tony Cowan, Sr. Web Services Architect, ISSW Andre Tost, Sr. Certified IBM Technical Specialist Yaroslav Dunchych, Sr. Consultant, ISSW Rick Robinson, ISSW EMEA Stan Cox, WAS Performance Harvey Gunther, Performance Web Services Development and Emerging Technology teams March 15, 2004
2.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Key Questions this Talk Addresses Are web services ready to be used for production applications? Where should web services be used? What do I need to understand about web services and where the technologies are today to architect them into my architecture – multiple protocols, security, performance? What is the right granularity for services? How to I get started today and architect for the future? How do Web Services, Service Oriented Architecture, and On Demand relate to each other?
3.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Web Services Best Practices References “Web Services Architecture and Design Best Practices” by Kyle Brown and Rachel Reinitz WebSphere Technical Developers Journal October, 2003 http://www- 106.ibm.com/developerworks/websphere/techjournal/0310_brown/brown.html "Performance Best Practices for Using WAS Web Services“, by Harvey Gunther WebSphere Developers Journal October, 2003 http://www.sys-con.com/websphere/article.cfm?id=394 Best Practices for Web Services Versioning by Kyle Brown & Michael Ellis IBM developerWorks, Jan. 2004 http://www-106.ibm.com/developerworks/webservices/library/ws-version/ Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions by Gregor Hohpe and Bobby Woolf, Addison- Wesley 2003, ISBN 0321200683
4.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Recommended Book on WebSphere includes Web Services Enterprise Java Programming with IBM Websphere, 2nd Edition Kyle Brown et al, Addison-Wesley, ISBN: 032118579X
5.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Distributed Systems Challenges Performance/scalability Management Accomplishing loose coupling Defining Granularity of interactions Maintaining context across systems Transaction, security, session state Protocol conversions Versioning Firewall and other security challenges Network bandwidth Failover Problem determination/Root cause analysis Development/integration/test cost Web Services are a set of technologies to enable applications to communicate with each other
6.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation IBM’s View of Web Services A Web Services is described by WSDL not limited to SOAP multiple protocols both synchronous and asynchronous both RPC and document oriented Evolutionary add web services to your existing designs does not require a radical redesign Web Services will not supplant other distributed technologies. They will supplement them. You have to start with good distributed design principles Proper layer design and layer placement is critical to success Enabling technology for Service Oriented Architectures and On demand systems Standards, Standards, Standards Interoperability is key Use open source and commercial tools wisely and adhere to standards Connection Enterprise Security Interoperability Discovery Management Business Processes Reliability Publication Description Messaging Transactions Security User Experience
7.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Web Services Anti-Patterns
8.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Domain Objects IIS Session EJB (app control logic) ASP SOAP over HTTP WebSphere Application Server Web Service Definition &Engine Model Managers Data XML XSLT Conversion to Domain XML format Convert Result Set into XML Data Access Objects DB Domain XML Good: WS for Interoperability Bad: XML/WS between application layers within a single J2EE server with no external access required Scenario: Do NOT use XML or SOAP over HTTP between Layers of an Application Convert XML into Domain Objects
9.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation SOAP Engine Generated SOAP stub EJB (controller/model) Swing (view/controller) Java Application SOAP over HTTP WebSphere Application Server Presentation Layer Business Layer SOAP Engine Web Service Do NOT Fine-Grained calls Across Distributed Systems Example calls getFirstName getLastName getOfficePhone … Bad: Using WS between WAS application servers (no firewall issues, fine grained interaction)
10.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Web Services Scenarios
11.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Delivering Business Value The key consideration in architecting and designing the use of web services is the business needs you are meeting Incorporating considerations with respect to current systems QoS requirements Enterprise architecture directions Cost The most common business need being addressed by Web Services is need to integrate disparate applications deployed on heterogeneous systems
12.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Packaged Applications (Siebel, Oracle Financials B2B (Amazon, Google, UPS) Other Systems (Perl, C++, Cobol) .NET Client J2EE Client J2EE Applications SOAP/HTTP Interoperability between Heterogeneous Systems Messaging Hub (uses Enterprise Service Bus Functionality)
13.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation B2B Message Exchange Simple B2B scenario Replace costly EDI infrastructure with Web Service Peer-to-Peer topology Focus on security Inventory Service WebSphere Application Server Railroad Application WebSphere Application Server Security: •Authentication •Privacy •Integrity •Non-Repudiation Web Service Web Service Integration •J2EE and .Net •Existing Applications Messages •XML vs EDI •Message compression Railroad Railroad Internet
14.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Need for an Enterprise Services Bus – Existing Architecture CICS CICS CICS Gateway Gateway Translator (x 10's) App Server App Server App Server (x 100's) custom protocol SNA Motivating Factor: Eliminate a layer of translator servers between the Web Application Servers and the Mainframe data Lots of critical business logic in Mainframe CICS transactions and DB2 Stored procedures Presentation layer is implemented through high-performance, complex Web front ends that change very often The bottleneck became the middle tier translation Translation was done through a layer of custom translator servers that exposed a common Java API (pre-JCA) to the mainframe functionality Custom load-balancing, failover strategy and security
15.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Solution: Enterprise Services Bus using WAS WS Gateway Eliminate the middle tier of custom built translation servers by allowing application servers to communicate with the backend using standard protocols HTTP and JMS (MQ Series) Move the data translation from the middle tier to the mainframe Use WebSphere Studio to wrap transactions and stored procedures as Web Services Need for protocol translation (for async), standard security, metering, and load-balancing between the App Servers and Mainframe Reduced hardware costs, reduced development time Gateway Gateway SOAP Engine CICS App Server App Server App Server (SOAP client) SOAP over HTTP Gateway Gateway WS Gateway (WAS 5.x ND) SOAP over JMS SOAP over HTTP Or JMS protocol translation routing/load security metering
16.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Enable content and application providers to create Interactive services that plug and play with portals via the Internet rather than only through the local portlets Uses Web services concepts WPS Local Portlet WSRP Service Local Portlet Local Portlet Local Portlet WSRP Service WSRP Service WSRP Service WSRP Service WPS Local Portlet WSRP Service Local Portlet Local Portlet Local Portlet WSRP Service WSRP Service WSRP Service WSRP Service Remote Local Portal Server Web Services for Remote Portlets (WSRP)
17.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Choosing the Granularity in SOA Unified Logical View An extension of the Facade pattern -- encapsulation of technology- specific details Exposing Common Legacy Interfaces Provide new protocol access and/or interface to legacy systems Composable component So that you can create business process with the elements (BPEL4WS) Replaceable component Isolating requestors from change in the implementation Most important consideration – what services are needed to enable delivering business value
18.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation IBM Software Group | WebSphere software "Service" Interfaces vs. "API" Interfaces ... Think of the difference between applying for a mortgage over the phone or by post ... By post: 1. Client requests application form 2. Provider sends it 3. Client fills it in and returns it 4. Provider says "yes" or "no" By phone: 1. Client calls provider 2. Provider says "Hello, how can we help" 3. "I'd like a mortgage please" 4. "What's your name" 5. "John Smith" 6. "What's the property address" 7. "27 ..." 8. etc. 9. etc. 10. etc. 11. etc. 12. etc. 13. "... OK, your mortgage agreement number is 12345, I'll post the rest of the details" Service-like - the interaction is not dependent on the *identify* of the service provider - i.e. the completed application form can be returned to a different branch than the one that provided it. API-like - the interaction is dependent on the specific representative of the estate agent - i.e. the *identity* of the service provider IBM Software Group | WebSphere software "Service" Interfaces vs. "API" Interfaces ... Think of the difference between applying for a mortgage over the phone or by post ... By post: 1. Client requests application form 2. Provider sends it 3. Client fills it in and returns it 4. Provider says "yes" or "no" By phone: 1. Client calls provider 2. Provider says "Hello, how can we help" 3. "I'd like a mortgage please" 4. "What's your name" 5. "John Smith" 6. "What's the property address" 7. "27 ..." 8. etc. 9. etc. 10. etc. 11. etc. 12. etc. 13. "... OK, your mortgage agreement number is 12345, I'll post the rest of the details" Service-like - the interaction is not dependent on the *identify* of the service provider - i.e. the completed application form can be returned to a different branch than the one that provided it. API-like - the interaction is dependent on the specific representative of the estate agent - i.e. the *identity* of the service provider
19.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WebSphere Application Server (WAS) DB2 DB2 Mainframe CICS and CICS Java Gateway Employee Service Implementation JCA CICS mapper JDBC JDBC mapper 3rd party system custom code Business logic (decides which backends to call and merges data) Empl. Service Session EJB JAX- RPC Empl SEI SOAP Engine Facade Unified Logical View – Hide the implementation details. Do not expose existing legacy interfaces/transactions – provide new abstraction (Façade Pattern)
20.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Adapting Common Legacy Interfaces to New Protocols Existing interface at good level of granularity for the business service (Adapter Pattern) SOAP/HTTP(S) WebSphere Channels Everyday Banking CICS systems Branch .Net Client Customer Information Loans and Mortgages Term Investments Mutual Funds Internet WebSphere (Linux) EXCI, 3270, 2980 Call Center .Net Client Adapter Service Adapter Service Adapter Service Adapter Service Adapter Service Middle Tier Product Systems
21.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Web Services Process - “Choreography" Business Process Execution Language for Web Services (BPEL4WS) Define flow as abstract series of activities Each activity is implemented by a WSDL interface Provides means for handling shared state, compensations, faults etc. Expose a process as a web service Web Service Choreography Activity 1 Shared state and context Public Private Web Service Web Service WSDL Interface WSDL Interface WSDL Interface Activity 2 Activity 3 Individual application transactions
22.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Business Process Function Service Member Requests an Rx Refill (Call Center IVR or Online) Request Denied Rx Dept Processes Refill PC Physician Approves or Denies Request (WS or Email) Member Informed that Refill is Ready Validate Member is Authorized to Make Request Determine Member’s Coverages and Primary Care Physician Send Request Notification to pharmacy Send Request Notification to Notes Patient Records Business Transaction Member Informed that Request has been Denied Request Approved WS Enabled Not WS Enabled Credit Verification Office Scheduling Email System Authorization Service Email Service Outpatient Service Masters Service HR - long running - one or more persons interacting - multiple valid BP states - alternative workflows for non-normal conds - short term, non-interactive - one change of business state or STP - consumes one or more enterprise service -targeted level of service reuse - loose coupling very important - may require compensating transactions - collaborations to implement a single WS - collaborating apps encapsulated via WS(s) - performance more important than loose coupling Composable Web Services – Request Prescription Refill
23.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Insurer A Adapter Insurer B Adapter Insurer C Adapter Broker getQuote Insurer A Insurer B Insurer C Insurer X Adapter Quote WSDL Private UDDI Registry Replaceable Component In one insurance application, the broker obtains policy quotes from several different systems Think of this as a large-scale application of the Strategy pattern
24.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Where to Use Web Services Implementing a Service Oriented Architectures with an Enterprise Service Bus Interoperability between heterogeneous systems B2B Adding flexibility to business Delivering information via services, ex. WSRP Replaceable component Deployability Ability to get through firewalls, handle content based routing and filtering Enable reuse by exposing legacy applications over new protocols To expose a common, language neutral interface and hide implementation details Unified view and business logic Loose coupling Defer the choice of transport and supporting multiple protocols Minimize impact of changes in one system effecting other systems
25.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Web Services Relationship to Service Oriented Architecture and On Demand
26.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation An approach for building distributed systems that deliver application functionality as services to either end-user applications or other services It defines : An architecture that leverages open standards to represent software assets as services. Provides a standard way of representing and interacting with software assets Individual software assets become building blocks that can be reused in developing other applications Shifts focus to application assembly rather than implementation details Used internally to create new applications out of existing components Used externally to integrate with applications outside of the enterprise What is a Service Oriented Architecture?
27.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation SOA Web services Build Deploy Consume Manage Secure SOA and Web Services
28.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Flexible Business Models Transformation Business Process Outsourcing Mergers, Acquisitions & Divestitures Increased financial pressures require greater flexibility from business models and supporting IT architecture Composable Processes Flexible IT Architecture On demand Operating Environment Requires Composable Services Software Developme nt Integration Infrastructure Management Service Oriented Architecture (SOA) Developm ent Infrastruct ure Managem ent
29.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Web Services – Multiple Protocols
30.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Sync Async Broadcast Queued (Latency) Reliable Delivery Open Standard Message Queue X X X X * (JMS – Java only) HTTP X X SMTP X X X X RMI-IIOP X X X* Choose the Protocol based on the Requirements
31.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Remote EJB IF JAX-RPC Service Endpoint Interface (SEI) MDB Local EJB IF EJB Impl Java clients, Servlets/EJBs in other JVMs Non-Java clients JMS-enabled clients Servlets, EJBs in the same JVM RMI-IIOP SOAP/HTTP XML/JMS Java Balancing J2EE protocols If the application server may have Java as a service requester, may want that Java client to make an RMI/IIOP call to an EJB instead of using SOAP over HTTP. Support both RMI/IIOP and web services interfaces Support SOAP over JMS for reliable messaging
32.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Between Java Application Servers – SOAP/HTTP vs. RMI/IIOP (WebSphere 5.1) Performance SOAP/HTTP approaching RMI/IIOP for complex types Do not eliminate SOAP/HTTP due to performance without testing it For best performing, use RMI/IIOP (for now) Security Security context maintained with little cost over RMI/IIOP HTTP/S gets through firewalls much more easily then IIOP HTTP/S works well for single hops, but not across multiple hops needs WS-Security WS-Security bridges from SOAP to EJB, but at significant performance cost and interoperability is still being worked out Transactional Context RMI/IIOP maintains transactional context WS-Transaction is not yet available
33.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation JMS or HTTP for Synchronous Web Services Interactions The only reason to use JMS for Sync SOAP service is if it is the existing protocol choice for the application exposing web services Whether using HTTP or JMS, client code needs to handle timeout situation When using HTTP if service is unavailable, fault returned immediately When using JMS if service is unavailable, must wait for timeout to occur Use of persistent queues (guarenteed delivery) does not provide any additional QoS for sync and will degrade performance
34.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Location Transparency and Invocation Frameworks
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Location Transparency and Invocation frameworks Want web service requestors to be unaware of the service endpoint Preferably also unaware of binding/protocol information Read endpoint from startup configuration or lookup dynamically Register implementation WSDL with endpoint in UDDI Cache the endpoint in the requestor for efficiency Want binding/protocol to be part of the configuration or deployment of the requestor, not in the requestor code Would like containers or intermediaries to apply ‘policies’ to determine correct binding and endpoint choice
36.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Describing Multiple Protocols in WSDL Java EJB Java JCA CICS IMS MQ A B C D E F Reserve Cancel Reserve Cancel Reserve Cancel Charge Refund Java code SAP etc WSDL Legacy/EAI Adapters JMS/MQ RMI/IIOP RMI/IIOP BPEL JMS RMI IIOP Operational definition: A service is an application function exposed with any protocol that can be described in WSDL not necessarily with SOAP! This is why WSDL is more important to SOA than SOAP. SOAP is still the best way to interoperate with a different organization
37.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Client DelegateFactory RemoteEJBDelegate LocalEJBDelegate WebServiceDelegate RemoteEJBInterface LocalEJBInterface ServiceEndpointInterface SessionEJBImpl RMI -IIOP Java call SOAP/HTTP DelegateService <<interface>> Delegate design pattern as an Invocation Framework A Stateless Session EJB is a preferred web service implementation Want to hide the protocol used to call the EJB functionality Consider using the adaptation of the Business Delegate Pattern (from Crupi’s J2EE Patterns) Client is written to interact with the Delegate interface and use the DelegateFactory to get the actual Delegate implementation
38.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Service Invocation Choices Java EJB Java JCA CICS IMS MQ A B C D E F Reserve Cancel Reserve Cancel Reserve Cancel Charge Refund Java code SAP etc WSDL Legacy/EAI Adapters JMS/MQ RMI/IIOP RMI/IIOP BPEL JMS RMI IIOP WSAD Proxy WSIF deprecated! App JAX RPC ...
39.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Separating Application Data/Logic from Quality of Service ( QoS) Key is use of headers to provide data about the processing of the message Not application data Separate the processing of the headers from the application logic Express processing rules declaratively in configuration files Application server containers are starting to provide processing of headers (ex. WS-Security) Write your own configurable components to process headers Supported by standards SOAP header WSDL description of header WS-XX standards mostly target adding information to message header WS-Policy framework
40.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation SOAP Headers SOAP Headers are an important feature of SOAP (maybe the most important feature) Separate application processing, QoS information from the application data So we want containers and custom code to be able access SOAP headers Containers are adding support to directly process headers Example: In WAS 5.0.2 supported WS-Security headers are specified as part of deployment. WAS will process the header and propagate security context from the web service message to J2EE security context <SOAP-ENV:Envelope …."> <SOAP-ENV:Header> <wsse:SecurityToken> <wsse:TokenType>wsse:X509v3</wsse:TokenType> </wsse:SecurityToken> </SOAP-ENV:Header> <SOAP-ENV:Body> …. </SOAP-ENV:Body> </SOAP-ENV:Envelope>
41.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Enterprise Service Bus (ESB) The “enterprise service bus” concept is often used to describe the mechanism by which services interact with requestors and each other i.e. it provides the communication infrastructure The “enterprise service bus” should provide: A consistent, location-transparent and protocol-independent means to address services. A consistent and location-transparent means to mediate/route between service requests and responses based on that address. This means that service endpoints need only to be concerned with connecting to some local communication protocol (i.e. able to open an HTTP socket or place a message on / retrieve a message from a local queue). Communicate service requests / responses through whatever mixture of protocols (HTTP, messaging etc.) that provide connectivity between any set of end-points. Ability to deploy mediations for a specific service or group of service Enterprise Service Bus Local JAX- RPC Requestor Mediations(s) SOAP Requestor Local Service Remote Service MQ Requestor
42.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Enterprise applications Enterprise data Data Access Services Application Access Services IBM Software Offerings Monitoring Services Business Integration Reference Architecture Model, design, development, test tools Common Runtime Infrastructure WebSphere BI Modeler WebSphere BI Monitor Web Services Gateway WebSphere BI Event/Message Broker WebSphere MQ WebSphere BI Adapters DB2 Information Integrator Classic WebSphere Studio DB2 Information Integrator WebSphere Business Integration Server WebSphere Business Integration Connect WebSphere Application Server Enterprise Service Bus Process Services Community Integration Services Application Services Information Services WebSphere Portal Server User Interaction Services
43.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WS-Policy Policies describe the capabilities and requirements of service providers and consumers, e.g. Encryption required Digital Signature required WS-Policy is a domain-neutral framework for defining policies Policies are associated with services or requestors Communicate the service or requestor what QoS are expected Can be attached to particular WSDL Matchmaking Vision: Matchmaking engine will find Service Providers with required business function, and matching policy Could be part of Enterprise Service Bus Selection will become more complex Combination of multiple requirements Eg only use secure service if amount > $10 Matchmaking is an emerging technology; early versions are available in the Emerging Technology Toolkit (ETTK) on Alphaworks
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Example of WS-Policy <wsp:Policy xmlns:wsp="http://schemas.xmlsoap.org/ws/2002/12/policy" xmlns:wsse="http://schemas.xmlsoap.org/ws/2002/12/secext"> <wsp:ExactlyOne> <wsse:SecurityToken wsp:Usage="wsp:Required“ wsp:Preference="100"> <wsse:TokenType>wsse:Kerberosv5TGT <wsse:TokenType> </wsse:SecurityToken> <wsse:SecurityToken wsp:Usage="wsp:Required" wsp:Preference="1"> <wsse:TokenType>wsse:X509v3</wsse:TokenType> </wsse:SecurityToken> </wsp:ExactlyOne> </wsp:Policy>
45.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Web Services Performance Best Practices Work by Harvey Gunther and Stan Cox – WebSphere Web Services Performance experts
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Summary of WS Performance Best Practices Best web services call is no web services call Really no distributed system call Be smart about designing your DISTRIBUTED application Create a prototype and test it under load Test performance before assuming you have a performance issue Time spent in Web Service processing maybe small % of your overall processing time. You can use Tivoli Performance Monitoring to measure the time required to process Web services requests. SOAP over HTTP (in WAS 5.1) approaches comparable performance to RMI/IIOP Particularly for complex types, within 20 – 40% XML, Java, and Web Service engines are getting faster quickly Use the fastest engines you are comfortable with
47.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Summary of WS Performance Best Practices (cont.) Designing Messages Medium granularity web services perform best Avoid fine-grained calls Large payloads may result in network delays Simpler schemas perform better Avoid Deep Nesting of Objects Choose RPC/literal or document/literal wrapped over SOAP Encoding Use Application Server caching capabilities WebSphere has declarative based caching of SOAP requests. Web service specific components used to construct a cache-id Use EJB “pass by reference” Avoid Overhead of “Pass By Value” Marshalling So set WebSphere to use ‘no local copies’ Beware of WS-Security performance
48.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Avoid Fine Grained Messages The next slide shows the performance implications of fine-grained messaging. Assume you have a 50K object that has 50 properties, each 1K long. You can retrieve this object: – in one Web service request of 50K; – in 50 requests for 1K each; – in some other combination, such as 10 requests for 5K each. Transferring the 50K in one single Web services request is the best-performing alternative. Transferring 1K, 50 times is the worst- performing alternative. The overhead cost of latency is the major factor.
49.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Performance Comparison of sending 50K length Retrieving 50K * 1, 5K * 10, 1K * 50 156 44 11 173 300 900 0 20 40 60 80 100 120 140 160 180 50K * 1 5K * 10 1K * 50 Payload Size Requests Per Second 0 100 200 300 400 500 600 700 800 900 1000 Response Time ms Avoid Fine Grained Messages From Harvey Gunther
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation A brief look at the past…. 214 502 680 125 210 410 16 33 91 0 100 200 300 400 500 600 700 Requests per second 1K / 10 10K / 100 100K / 1000 Input Payload Size and Complexity WebSphere 4.0 SOAP WebSphere 5.0 Tech Preview WebSphere 5.0.2 WS Analysis WAS 5.02 Web Services engine is IBM technology Performance improving architectural changes IBM XML Parsing technology, SAX based processing, Custom serializers Standards based programming model (JAX/RPC), etc. Numerous algorithm/code enhancements WAS 5.02 Web services performance improves ~2-3x across a set of primitive workloads as compared to Apache and WAS 5.0 Tech preview
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Web Services Product Information
52.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WebSphere 5.0.2/5.1 Web Services support Base WebSphere AppServer Enhanced performance (SAX Based) JSR 101 (JAX-RPC) 1.0 and SAAJ 1.1 JSR 109 1.0 WS-I Basic Profile 1.0 WS-Security ASTK support SOAP/JMS support JSR 109 performance monitoring support Enhanced Command line tools WSIF (additional providers for WAS 5.02 engine) Web Services Caching UDDI4J version 2.0 Apache SOAP Network Deployment (ND) WebSphere AppServer Web Services Gateway – JAX-RPC handlers, performance improvements, WAS HTTP and JMS channels UDDI Registry – Custom taxonomy support Enterprise Edition WebSphere AppServer Web services Gateway filter programming model Web Services Choreography
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WebSphere Studio Application Developer 5.1/5.1.1 Web Services Support Eclipse 2.1 JDK 1.4 (5.1.1) WAS 5.1, 5.02, 5.0, 4.0, Apache AXIS 1.0 runtimes supported Web Services wizards enhanced to support features of WAS 5.02 Support for document literal and RPC SOAP-encoded Support for SOAP over JMS for EJB web services Default WS-Security options WS-I produce and consume WS-I compliant WSDL Validation of WSDL and of SOAP Messages WSDL Editor and validator Deployment descriptor editors Command line tools Web Services Explorer expanded UDDI custom taxonomy definition Dynamic testing of web services defined by a WSDL file Web Services discovery dialog as part of Java Server Faces tooling (5.1.1) Expanded preferences, cheat sheets
54.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WebSphere 5.1 WS Gateway Functionality Configurable runtime component HTML web admin GUI Maps WSDL documents Target service maps to Gateway service Target bindings replaced by gateway bindings Target service/port replaced by Gateway service/port Handles UDDI lookup/publication Service proxy capability Processes requests WS-Security support Handles authorization Forwards requests to target service Sends responses back to originator Protocol conversion Using JAX-RPC or WSIF support Support Intermediation Pluggable protocol independent request/response filters (WSIF) JAX-RPC Handler chains Selective Parsing (only headers) for high performance
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Additional Web Services Design Best Practices – will NOT Be Talked about in Presentation
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Client cache Business Delegate Web Services Proxy Load Balancer Stateless Web Service Stateless Web Service Stateless Web Service Design Best Practices Web Services should be coarse-grained interfaces Web Services should be stateless Even though it's possible to use transport state mechanisms they should be avoided The best web service call is NO web service call Design your web services (data being exchanged) to meet business needs and for performance Consider asynchronous messaging instead of synchronous RPC- style interaction asynchronous is a more loosely coupled interaction model
57.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WS-I Basic Profile HTTP V1.1 specific on HTTP errors and response codes must not require cookie support XML 1.0 and XML Schema 1.0 may use any construct from Schema 1.0 SOAP V1.1 Use of SOAP encoding disallowed specific on structure of fault and when to generate faults “Trailers” (element content after soap-env:Body) disallowed Use of SOAPAction, soap-env:actor clarified WSDL V1.1 with SOAP use="literal" Exclude use of wsdl:import for XSD files Numerous spec clarifications only one element in the Body of the element UDDI V2.0 Established category to identify WS-I conformant entities tmodels must use WSDL as descriptive language
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Use WAS 5.02 or later for Web Services Earlier versions of WAS use Apache SOAP web services engine Apache SOAP does not support WS-I Only support RPC SOAP-encoded style of web services Very limited interoperability capability Performance is not very good Java Web Services Standard APIs JAX-RPC and JSR109 Handler support Full WS-I support WS-Security support JMS support JMX MBean for monitoring web services Latest version of WAS is consistently much faster than previous version UDDI Private Registry (additional features) Web Services Gateway extensive features added improved performance
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation But if Customer is on WAS 5.01 or earlier – seriously consider using Apache AXIS (open source) instead of Apache SOAP versus AXIS/JAX-RPC AXIS Open source Supported by WSAD 5.1 + Implements JAX-RPC programming APIs Document/Literal and RPC/SOAP encoded supported WS-I compliant Better performance than Apache SOAP Runs inside of WebSphere Easy migration to WAS 5.02 + Adds proprietary features beyond JAX-RPC Proprietary deployment model WAS Apache SOAP IBM Product support Runs inside of WebSphere Supported by WSAD 4.0 + Proprietary programming APIs and features RPC/SOAP encoded only (not WS-I compliant) Proprietary deployment model
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Summary of the Security Road Map SSL/TLS offers several security features including authentication, data integrity and data confidentiality but only for individual hops. What is needed in a comprehensive Web service security architecture is a mechanism that provides end-to-end security and greater functionality.
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Summary of the Security Road Map (cont) A Web service can require that an incoming message prove a set of claims (e.g., name, key, permission, capability, etc..) A requester can send messages with proof of the required claims by associating security tokens with the messages. When a requester does not have the required claims, the requester or someone on its behalf can try to obtain the necessary claims by contacting a security token service (also a web service).
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WS-Security for Web Services WS-Security spec describes a SOAP header that may contain information to secure the SOAP message and the process of incorporating security mechanisms (like XML Digital Signature and Encryption) into a SOAP message. Security token propagation UsernameToken, X.509, Kerberos, SAML, etc Can be used for identity assertion Message Integrity XML Digital Signatures Message Confidentiality XML Encryption Note that you could continue to just use SSL for integrity and confidentiality but you would lose the benefits of message based security. WS-Security for Web Services SOAP Header SOAP Envelope SOAP Body WS-Security Header Message content
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation There are two particular parts of the WSDL Binding to examine ƒ The binding style (Document or RPC) ƒ The encoding use (literal or encoded) Document RPC Literal Default for MS tools MS does not support ‘SOAP’ Encoded Should never occur Earlier Standard choice for Java tools First generation of Java tools supported RPC Encoded (often exclusively) MS always supported Document literal WAS 5.02+ supports RPC Literal, Document Literal, and RPC SOAP encoded WSDL SOAP binding choices WS-I - Do use literal WS-I - Do not use encoded
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation SOAP Encoded <binding name="TemperatureConverterBinding" type="tns:TemperatureConverter"> <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/> <operation name="fahrenheitToCelsius"> <soap:operation soapAction="" style="rpc"/> <input name="fahrenheitToCelsiusRequest"> <soap:body encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" namespace="urn:TemperatureConverter" use="encoded"/> </input> Literal <binding name="CSharpTempConverterSoap" type="s0:CSharpTempConverterSoap"> <soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document" /> <operation name="celsiusToFahrenheit"> <soap:operation soapAction="http://wsbootcamp.com/webservices/celsiusToFahrenheit" style="document" /> <input> <soap:body use="literal" /> </input> WSDL Encoding Example
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation “Wrapped” Document Literal If you use doc literal, the message may be “wrapped” or “unwrapped” Wrapped basically means that the name of the operation is part of the message schema Message is ‘wrapped’ in another element that represents the operation Additional complex type when generating WSDL from code Essentially makes document style invocation look like RPC Easier for the server to identify which method to call If not wrapped, the server must parse the message and look for an appropriate operation that takes that message Assume that wrapped document literal will be the normal case This is what MS does already Default of WSAD 5.1
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Backups
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation The On Demand Architecture On Demand Operating Environment Architecture U S E R B U S I N E S S Enterprise Services Bus Autonomic Services Utility Business Services Resource Virtualization Services Information Integration Services Business Application Services Business Process Choreography Services Common Services Access Services Business Process Services Business Connections Mediation & Messaging, Events Availability Management Security Management Billing License Mgmt Services Rating Metering Services Server Storage Distributed Systems & OGSA Network Choreography Engine Personalization Reporting Custom Applications Packaged Applications Topologies Business Rules Modalities ETL Acquired Services Business Performance Management Business Process Services Data Access Services Automation Services Provisioning Management Optimization Management Policy Based Orchestration User Interaction Services Collaboration Presentation FormFactors Business Process Services Business Process Services Business Process Services
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Steps on the SOA adoption path Point of Entry Business Value On Demand Business Transformation 4 Leverage SOA for outsourcing, off- shoring, hosting, etc Enterprise Wide IT Transformation Using SOA 3 Leverage existing EAI infrastructure to build enterprise wide SOA using ESB Service Oriented Integration (BU or Department Level) 2 Integrate several applications, develop some new application logic, model and choreograph processes Point of Entry Web services 1 Make existing application available to multiple clients via a web service using App Server as middle tier Use Case
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Enterprise Service Bus Defining Concepts – the IBM View Service Orientation Middleware that facilitates loose coupling between software components. Interoperability Open protocols support the interoperability of middleware from multiple vendors. Incremental Integration The distribution of low-function message brokers to provide low initial costs and step by step growth capabilities. Heterogeneity Integrated, multi-protocol, multi-API, message distribution, routing and processing middleware to support extremely diverse systems and applications. Substitution Open APIs allow the substitution of middleware from different vendors. Event Orientation Decoupling applications that publish business events from subscribing applications. Qualities of Service A variety of qualities of persistence, performance, reliability, security, availability and transactionality. Universality A universal connectivity layer extends the scope and scale of integration across an extended enterprise
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Process Server Community Integration Server Business Integration Reference Architecture Enterprise Service Bus Services to Meet Business Requirements Application Server Development Tools, Services Model, Design, Development, Test Tools Monitoring Server Data Access Server Enterprise Data User Interaction Server Common Runtime Infrastructure* Enterprise Applications Application Access Servers Information Integrator Server
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Implementing an Enterprise Service Bus Today WebSphere MQ and WebSphere BI Message Broker provide the basis for today's service bus WebSphere MQ provides message transport for SOAP and other data formats, accessible from both JMS and .NET Message Broker provides access to a variety of transport with different QOS, including HTTP and MQ. Provides data transformation and routing (mediation) services WebSphere BI Connect and the WebSphere Web Services Gateway extend the bus to external service consumers and external service providers
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WebSphere 5.1 Web Services Gateway SOAP/HTTP query Requstor External UDDI Internet DMZ Intranet firewall firewall SOAP/HTTP other channel Service Provider SOAP/HTTP Private UDDI Requestor Service Provider SOAP/HTTP EJB/RMI-IIOP SOAP/JMS WSIF provider publish publish query ‘Filters’ ‘JAX-RPC Handlers’ WS Gateway can be used to implement an Enterprise Service Bus TODAY. WAS 5.1 WS Gateway
73.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WebSphere 5.1 WS Gateway Functionality Configurable runtime component HTML web admin GUI Maps WSDL documents Target service maps to Gateway service Target bindings replaced by gateway bindings Target service/port replaced by Gateway service/port Handles UDDI lookup/publication Service proxy capability Processes requests WS-Security support Handles authorization Forwards requests to target service Sends responses back to originator Protocol conversion Using JAX-RPC or WSIF support Support Intermediation Pluggable protocol independent request/response filters (WSIF) JAX-RPC Handler chains Selective Parsing (only headers) for high performance
74.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Enterprise Service Bus WebSphere MQ and WebSphere BI Message Broker provide the basis for today's service bus WebSphere MQ provides message transport for SOAP and other data formats, accessible from both JMS and .NET Message Broker provides access to a variety of transport with different QOS, including HTTP and MQ. Provides data transformation and routing (mediation) services WebSphere BI Connect and the WebSphere Web Services Gateway extend the bus to external service consumers and external service providers
75.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Service provider policies Policy documents can be created/rendered from configuration and deployment information at runtime Bottom-up: Configuration files define WS-Policy document Top-down: WS-Policy document requires particular configuration Service provider requirements and capabilities can be Integral to the business logic of a service Requirements that the business logic places on the infrastructure Functions of the infrastructure alone Client separates the business logic from the mechanisms used to satisfy the policies Finds policy documents from WSDL, UDDI Invokes domain-specific policy providers to interpret policy Invokes domain-specific mediations to implement policy
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation Enterprise Service Bus MQ Messag e Brokers Application Servers Integration Server MQ Portal Web Clients Web Browsers Legacy Application s The service bus within the enterprise will evolve to include existing MQ and Event/Message Broker networks, seamlessly integrated with new WebSphere platform messaging capability packaged in Application Servers, Integration Servers, and potentially stand-alone offerings The messaging capabilities packaged within the App Server and Integration Server will provide them with inherent messaging services and an on-ramp to the enterprise bus. The bus will extend outside the enterprise via appropriate gateways such as WebSphere BI Connect and the Web Services Gateway
77.
IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WebSphere 5.x Web services performance monitoring WAS 5.02 provides detailed performance monitoring for Web services Size of request and response payloads Response times full request Web services specific processing … Counter/Statistic Name Description numberReceived Number of requests service received numberDispatched Number of requests service dispatched/delivered numberSuccessful Number of requests service successfully processed responseTime The average response time, in milliseconds, for a successful request requestResponseTime The average response time, in milliseconds, to prepare a request for dispatch dispatchResponseTime The average response time, in milliseconds between dispatch of a request and receipt of reply replyResponseTime The average response time, in milliseconds, to prepare a reply after dispatch size The average payload size in bytes of a received request/reply requestSize The average payload size in bytes of a request replySize The average payload size in bytes of a reply
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IBM Software Services
for WebSphere Web Services Best Practices © 2003, 2004 IBM Corporation WAS 5.02 Tivoli Performance Viewer - Demo
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