Web Services and Service Oriented Architectures. Thomas Soddemann, RZG

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1 Web Services and Service Oriented Architectures, RZG Delaman Workshop 2004

2 Overview The Garching Supercomputing Center - RZG Diving into the world of Web Services Service Oriented Architectures And beyond Delaman Workshop

3 RZG Rechen-Zentrum Garching Supercomputing Center for the Max Planck Society (MPG) Services and involvements: Supercomputing facility with a 5 TFlop IBM Regatta system Linux compute farms Data Storage DEISA MiGenAS D-Grid German Grid initiative Data Acquisition for ASDEX Upgrade and Wendelstein 7X (Plasma Physics) Delaman Workshop

4 Machine Room Delaman Workshop

5 DEISA Distributed European Infrastructure for Supercomputing Applications Consortium of leading national supercomputing centers focuses in deploying an Grid empowered infrastructure to build a distributed terascale supercomputing facility Delaman Workshop

6 Web Services and more Delaman Workshop

7 Client Server Architectures 2-Server Side Tier Applications integrated Controller/View/Business logic, legacy applications and databases Client Server Legacy e.g. Web Browser Rich Client Internet Intranet e.g. Web Server PHP app. e.g. Databases Batch systems Delaman Workshop

8 Client Server Architectures 3-Server Side Tier Applications Client Frontend Enterprise Legacy e.g. Web Browser Rich Client e.g. Web Server and Web App. Enterprise application Internet Intranet Delaman Workshop

9 Client Server Architectures 3-Server Side Tier Applications with explicit services Client Proxy Frontend Enterprise Legacy Service Client Enterprise application Internet Intranet Delaman Workshop

10 Service A service can be discovered & dynamically bound.... is self-contained & modular.... exhibits a coarse grained service interface.... is based on a loose coupling between provider & consumer.... is interoperable.... is addressable and locatable via a network.... can be composed out of other services. Delaman Workshop

11 Web Service Definition W3C, Web Services Architecture, A Web Service is a software system designed to support interoperable machineto-machine interaction over a network. It has an interface described in a machine-processable format (specifically WSDL). Other systems interact with the Web service in a manner prescribed by its description using SOAP messages, typically conveyed using HTTP with an XML serialization in conjunction with other Web-related standards. Delaman Workshop

12 Message Oriented Model View agent originates processes message header(s) delivers Message transport body Delaman Workshop

13 Service Oriented View agent realizes owns/controls Service message signals describes meta-data Delaman Workshop

14 Resource Oriented View URI owns has resource may have representation Delaman Workshop

15 Policy Model View agent establishes subject to policy applies to constraints resource action Delaman Workshop

16 Web Services Examples Web service Provides airport and flight weather information Amazon Web Services (AWS & ECS) Provide e-commerce services such as lookup of books Google Web API Guess... Delaman Workshop

17 Services: Roles and Interaction Implementations: Service Broker (Registry) UDDI JNDI CORBA naming find publish Service Consumer bind Service Provider Delaman Workshop

18 Services: (Dynamic) Proxy Service Broker (Registry) find e.g. WSDL Service Consumer Implementation Code Proxy bind Service Provider Delaman Workshop

19 Objects Reference identifier to reference an object during its lifetime State state of the object represented by its attributes Interface collection of methods which are necessary to interact with the object Delaman Workshop

20 Is a Service an Object in general? A service can be referenced during its lifetime... does not necessarily have a state... does have an interface RQ Q R [ A service is not an Object in general. Delaman Workshop

21 Service Oriented Architectures (SOA) An architecture of software which is composed of services. Service Oriented Architecture Web Services CORBA Jini EJB No Objects Objects Objects Objects Simple WS: No session, no state [ e.g. Shopping Cart realization? Desirable: Object like Web services Delaman Workshop

22 Example: Shopping Cart in J2EE R Request Servlet containter EJB containter Controller EJB Response View Database Delaman Workshop

23 Problem: Shopping Cart in a Web Service world R Request Servlet containter EJB containter Response Database Problem: No State, no session [ no shopping cart service Note: HTTP(S) session is not enough Delaman Workshop

24 Services Architectures Web service Is not an object in general Rather XML documents are exchanged Are the interface to a part of the Business Logic Enterprise Java Beans Are Objects by definition Encapsulate the Business Logic of J2EE applications CORBA Common Object Resource Broker Architecture CORBA Objects are Objects by definition Encapsulate the Business Logic of Enterprise Applications Further: Jini,... Delaman Workshop

25 From a simple Web Services to an (quasi) Object The Web Services Resource Framework WS-RF A Web Service Resource (WS-Resource)... can be destroyed (explicit destroy or expiration) and its lifetime may be monitored WS-ResourceLifetime... contains a state through attributes/properties WS-ResourceProperties... references can be renewed WS-Addressing WS-RenewableReferences... employs a (more) standardized fault reporting mechanism WS-BaseFault Further: By-reference collections of Web Services can be defined. WS-ServiceGroup Delaman Workshop

26 Web Services Architecture Stack Processes Discovery, Aggregation, Choreography,... Security XML, XSD Descriptions (WSDL) Messages SOAP Extensions SOAP Communication Layer (HTTP, SMTP,...) Delaman Workshop

27 Software Architecture for the Access Infrastructure Consumers Portals Rich Clients Code Partners Transport HTTP SMTP Message Broker Workflow Services k Business processes, services with external interaction Business Services Complex Services composed of component services Data Services Data querying and access to mutitple data sources Component Services Atomic services potentially acting on single ERs Enterprise Resources DB Code Legacy Partners Management Core Services Policies Security Brokers Interceptrors Delaman Workshop

28 WS-Security Original Requester End to end security SOAP with security context Security Intermediary SOAP with security context Ultimate Receiver Delaman Workshop

29 WS-Security Threats: Message Alteration modififying the message content Confidentiality accessing message parts such as credit card info Man-in-the-middle establishing complete access to messages Spoofing exploting trusted relationships Denial of Service preventing a legitimate user from accessing a service Replay Attacks interception of messages and playing to back to the service Delaman Workshop

30 WS-Security WS-Security has to insure/provide Authentication mechanisms (PKI) Authorization Data integrity and confidentiality Integrity of transactions and communications Non-repudiation (detection of transaction initiated/altered by a 3 rd party) End-to-end integrity and confidentiality of messages Audit trails (trace user's behavior) Delaman Workshop

31 Implementation and deployment: J2EE Network Web Server EJB Container Client Servlet Container Database Delaman Workshop

32 Distributed Service Centers Web Server EJB Container Network Servlet Container Database Network Client Web Server EJB Container Servlet Container Database Delaman Workshop

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