ESB Environment, Service Component Architecture (SCA)

Transcription

1 ESB Environment, Service Component Architecture (SCA) Szolgáltatásorientált rendszerintegráció Service-Oriented System Integration Dr. Balázs Simon BME, IIT

2 Outline Typical ESB Environment Business Processes Human Tasks Business Rules Complex Event Processing Service Repository Service Component Architecture Dr. Balázs Simon, BME, IIT 2

3 Typical ESB Environment Dr. Balázs Simon, BME, IIT 3

4 SOA layers User Interface Business Processes Services Operational Systems Web Mobile Human tasks BPMN BPEL ESB Web services SCA Cobol Java... Dr. Balázs Simon, BME, IIT 4

5 ESB environment Business Processes (BPMN, BPEL) User Interface (Web, Mobile, Human tasks) Business Rules Complex Event Processing Service Registry & Repository ESB (SCA) Operational Systems, Legacy Systems, External Services (Java,.NET, Cobol,...) Dr. Balázs Simon, BME, IIT 5

6 Business Processes Dr. Balázs Simon, BME, IIT 6

7 ESB environment Business Processes (BPMN, BPEL) User Interface (Web, Mobile, Human tasks) Business Rules Complex Event Processing Service Registry & Repository ESB (SCA) Operational Systems, Legacy Systems, External Services (Java,.NET, Cobol,...) Dr. Balázs Simon, BME, IIT 7

8 Business process environment Service Interface Business Process Manager Service Interface Dr. Balázs Simon, BME, IIT 8

9 Business process Goal: build more complex services by calling and combining other services business processes are also services A business process connects tasks in order to reach the desired effect Types of business processes: Operational process: basic process of an organization producing the primary business value Supporting process: supports basic processes, but not published to the world Management process: controls system operation Business processes can be split up to smaller processes Dr. Balázs Simon, BME, IIT 9

10 Human Tasks Dr. Balázs Simon, BME, IIT 10

11 ESB environment Business Processes (BPMN, BPEL) User Interface (Web, Mobile, Human tasks) Business Rules Complex Event Processing Service Registry & Repository ESB (SCA) Operational Systems, Legacy Systems, External Services (Java,.NET, Cobol,...) Dr. Balázs Simon, BME, IIT 11

12 Human tasks Some steps of a process may not allowed to be automated e.g. human decision, peer review A human activity is a special activity in the process: initiates a human task The process waits for the task to complete Dr. Balázs Simon, BME, IIT 12

13 Human task environment Business Process Manager Service Interface Human Task Manager Task Management User Interface create task task completed User Roles Task Assignment Deadlines Escalation Web Mobile Dr. Balázs Simon, BME, IIT 13

14 Task management There is a user interface for task management There is a pool of tasks Users only see the tasks for their user roles Multiple users work from the same pool A user can: check out a task complete the task escalate the task to a supervisor assign the task to another user Notifications through , SMS, etc. Dr. Balázs Simon, BME, IIT 14

15 Oracle BPM worklist Dr. Balázs Simon, BME, IIT 15

16 IBM human tasks Dr. Balázs Simon, BME, IIT 16

17 Business Rules Dr. Balázs Simon, BME, IIT 17

18 ESB environment Business Processes (BPMN, BPEL) User Interface (Web, Mobile, Human tasks) Business Rules Complex Event Processing Service Registry & Repository ESB (SCA) Operational Systems, Legacy Systems, External Services (Java,.NET, Cobol,...) Dr. Balázs Simon, BME, IIT 18

19 Business rules Logical if-then statements Separated from the application logic or business process Appear as external services to the business process Business professionals can define and maintain the rules without changing the application logic or business process Advantages: automating real-time decisions consistency quickly responding to changes pre-defining future changes Dr. Balázs Simon, BME, IIT 19

20 Business rule environment Business Process Manager Service Interface Business Rule Manager Rule Management User Interface perform rule Define Rules Perform Rules Web Dr. Balázs Simon, BME, IIT 20

21 Business rule examples Spending policies Approval conditions Regulatory requirements Discount or premium computations Offers based on customer value Tax calculations Dr. Balázs Simon, BME, IIT 21

22 Business rule building blocks Global: global variables Function: built-in functions (mathematical functions, string functions, etc.) Dictionary: key-value pairs Rule: decision based on a condition can be implemented programmatically or using decision tables can return a value, call another rule, call a service Ruleset: unit of execution for rules, order of rules Dr. Balázs Simon, BME, IIT 22

23 Oracle Business Rules Graphical: Textual: IF ExpenseItems.ReceiptAmount < 200 THEN call CreateSupervisoryList(levels:1, startingpoint:hierarchybuilder.getprinicipal("jstein",-1,"",""), uptoapprover:hierarchybuilder.getprinicipal("wfaulk",-1,"",""), autoactionenabled:false,autoaction:null, responsetype:responsetype.required,rulename:"rule_1",lists:lists) Dr. Balázs Simon, BME, IIT 23

24 IBM Business Rules Graphical: Dr. Balázs Simon, BME, IIT 24

25 Complex Event Processing Dr. Balázs Simon, BME, IIT 25

26 ESB environment Business Processes (BPMN, BPEL) User Interface (Web, Mobile, Human tasks) Business Rules Complex Event Processing Service Registry & Repository ESB (SCA) Operational Systems, Legacy Systems, External Services (Java,.NET, Cobol,...) Dr. Balázs Simon, BME, IIT 26

27 Events Business logic can generate events Business Activity Monitoring (BAM) The ESB can generate events based on the operation of the system based on specific messages These events can be collected and analyzed Multiple events can be combined Real time alerts can be generated Lot s of events: big data Dr. Balázs Simon, BME, IIT 27

28 Event management environment Business Process Manager Service Interface Event Manager Event Management User Interface generate event Event Store Notifications Actions Reports, Analysis Web Mobile Dr. Balázs Simon, BME, IIT 28

29 Event management Data and event collection storing them in a database Event analysis filtering and analysis (~ pivot tables in Excel) calculating key performance indicators (KPIs) Real time alerts: warnings and errors in the business logic in the system operation alerts sent via or SMS Interactive dashboard web-based user interface overview of the business and the system defining KPIs creating alerts Dr. Balázs Simon, BME, IIT 29

30 Oracle BAM dashboard Dr. Balázs Simon, BME, IIT 30

31 IBM Business Monitor Dr. Balázs Simon, BME, IIT 31

32 Service Registry & Repository Dr. Balázs Simon, BME, IIT 32

33 ESB environment Business Processes (BPMN, BPEL) User Interface (Web, Mobile, Human tasks) Business Rules Complex Event Processing Service Registry & Repository ESB (SCA) Operational Systems, Legacy Systems, External Services (Java,.NET, Cobol,...) Dr. Balázs Simon, BME, IIT 33

34 Service registry & repository Contains service artifacts (repository) Contains metadata about services (registry) Publishing and finding services Service versioning Service lifecycle management Virtualization of services Service usage and performance Service governance Integration with other SOA products Dr. Balázs Simon, BME, IIT 34

35 Service registry & repository Service artifacts interface description (XSD, WSDL, etc.) business processes policies Service metadata documentation contacts SLA, QoS usage histories references properties, relationships, classification Dr. Balázs Simon, BME, IIT 35

36 Dr. Balázs Simon, BME, IIT Service Component Architecture (SCA)

37 Service Component Architecture (SCA) OASIS standard mature, although not actively maintained anymore Programming model for building applications and systems based on SOA and usually to deploy them to an ESB Component and assembly model Creation and composition of services Reuse of existing application functionality within compositions Can be backed by an ESB Dr. Balázs Simon, BME, IIT 37

38 SCA component Properties Services Component References Implementation Dr. Balázs Simon, BME, IIT 38

39 SCA concepts Component unit of construction configured instance of an implementation Implementation provides business functionality can have properties implements service interfaces uses reference interfaces can be written in any programming language Java, C++, BPEL, JavaScript,... Component Dr. Balázs Simon, BME, IIT 39

40 SCA concepts Interface set of business functions services and references are typed by an interface Service business functions offered by the implementation used by other components Reference dependencies of the implementation uses a service provided by another component Binding services use bindings to describe the access mechanism that clients use to call the service references use bindings to describe the access mechanism used to call the service to which they are wired Dr. Balázs Simon, BME, IIT 40

41 SCA concepts Property has a name and value the value can influence the operation of the business functions Configuration a component configures an implementation by providing values for the properties by wiring the references to services provided by other components Assembly a set of components wires: connections between the components other related artifacts Dr. Balázs Simon, BME, IIT 41

42 SCA concepts Composite a component and an assembly at the same time contains other components provides services uses references has properties they can be bound to the properties of the contained components wires the contained components together provides a more complex business functionality combined from simpler components Dr. Balázs Simon, BME, IIT 42

43 SCA artifacts SCA artifacts are stored in XML the SCA XML is portable namespace: xmlns:sca=" SCA does not define any formal graphical notation however, tools usually follow the illustrations of the SCA standard SCA is language agnostic interfaces can be defined in any language implementation can be defined in any language but they may not be portable Dr. Balázs Simon, BME, IIT 43

44 SCA sample: XML mlns:sca=" mlns:bean="urn:switchyard-component-bean:config:2.0" non-standard SCA standard Functions FunctionsBean Java implementation <sca:component name="functionsbean"> <bean:implementation.bean class="sca.eval.functionsbean"/> <sca:service name="functions"> <sca:interface.java interface="sca.eval.functions"/> </sca:service> </sca:component> Java interface Dr. Balázs Simon, BME, IIT 44

45 SCA sample: Java interface package sca.eval; public interface Functions { double sqrt(double x); double sin(double x); } Dr. Balázs Simon, BME, IIT 45

46 SCA sample: Java public class FunctionsBean implements Functions public double sqrt(double x) { return Math.sqrt(x); } public double sin(double x) { return Math.sin(x); } Dr. Balázs Simon, BME, IIT 46

47 SCA sample: composite ExpressionEval EvalBean wire FunctionsBean Eval Eval Functions Functions promote Memory Memory promote Dr. Balázs Simon, BME, IIT 47

48 SCA sample: composite XML ExpressionEval EvalBean Functions Eval Eval Memory FunctionsBean Functions Memory <sca:composite name="expressioneval"> <sca:component name="functionsbean"> <bean:implementation.bean class="sca.eval.functionsbean"/>... </sca:component> <sca:component name="evalbean"> <bean:implementation.bean class="sca.eval.evalbean"/>... </sca:component>... </sca:composite> Dr. Balázs Simon, BME, IIT 48

49 SCA sample: composite XML ExpressionEval EvalBean Functions Eval Eval Memory FunctionsBean Functions Memory <sca:composite name="expressioneval">... <sca:service name="eval" promote="evalbean/eval"> <sca:interface.java interface="sca.eval.eval"/> </sca:service> <sca:reference name="memory" multiplicity="0..1" promote="evalbean/memory"> <sca:interface.wsdl interface="memory.wsdl#wsdl.porttype(memory)"/> </sca:reference> </sca:composite> Java interface WSDL interface Dr. Balázs Simon, BME, IIT 49

50 SCA sample: Java implementation package sca.eval; import org.oasisopen.sca.annotation.reference; import public class EvalBean implements Eval private Functions private Memory memory; public double eval(string expression) { //... } Eval EvalBean Functions Memory Dr. Balázs Simon, BME, IIT 50

51 SCA sample: WSDL interface <sca:interface.wsdl interface="memory.wsdl#wsdl.porttype(memory)"/> Memory.wsdl: Eval <?xml version="1.0" encoding="utf-8"?> <wsdl:definitions...>... <wsdl:porttype name="memory"> <wsdl:operation name="store"> <wsdl:input message="tns:storerequest"/> <wsdl:output message="tns:storeresponse"/> </wsdl:operation> <wsdl:operation name="load"> <wsdl:input message="tns:loadrequest"/> <wsdl:output message="tns:loadresponse"/> </wsdl:operation> </wsdl:porttype>... </wsdl:definitions> ExpressionEval Memory Dr. Balázs Simon, BME, IIT 51

52 SCA sample: Java interface <sca:interface.java interface="sca.eval.memory"/> EvalBean Eval Functions Memory.java: package sca.eval; Memory public interface Memory { void store(double value); double load(); } Dr. Balázs Simon, BME, IIT 52

53 Summary Dr. Balázs Simon, BME, IIT 53

54 Summary Typical ESB Environment Business Processes Human Tasks Business Rules Complex Event Processing Service Repository Service Component Architecture Dr. Balázs Simon, BME, IIT 54