An overview of this unit. Wednesday, March 30, :33 PM
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1 Process Page 1 An overview of this unit Wednesday, March 30, :33 PM Businesses implement business processes Interacting human and computing components. Arrows depict information exchange. With a specific set of outcomes. E.g., customer purchases thing. customer pays for purchase. package is delivered to customer. Clouds support business processes by supporting a specific computational outcome. by (indirectly) mitigating risk factors We get the second from scale, but how about the first?
2 Process Page 2 The dream of business process modeling Wednesday, March 30, :36 PM The dream of business process modeling A manager draws a picture of what should happen. Automagically, a computing solution appears that supports that picture. (Without any pesky programmers between the first and second lines!) The reality of business process modeling Before the cloud, there was a lot of work in mapping a process to a computation. Moving that work to the cloud now is prohibitively expensive. So what do we do instead?
3 Process Page 3 Two approaches Wednesday, March 30, :56 PM Two prevalent approaches to business modeling BPMN: draw a process, irrespective of whether it's executable by a computer or not. Intrinsically, a diagramming method that cannot be converted into an executable program. BPEL: define an executable part of a business process, separate from the human parts. Intrinsically, a programming language for creating services that implement a business process.
4 Process Page 4 Business Process Modeling 10:11 AM Business Process Modeling Describes "how a business works". Has human and IT elements. Reference:
5 Process Page 5 Business Process Modeling Notation (BPMN) 10:12 AM Business Process Modeling Notation (BPMN) A way of graphically describing a business process. Depicts workflow. Can be created via the Eclipse SOA Tools Project (STP). File/New /New project /General /Project File/New /Other/BPMN Diagram
6 Process Page 6 Processes 10:14 AM Rounded boxes are processes: Something that happens. Can receive messages or send messages. Can have sub-processes (that are sub-boxes).
7 Process Page 7 Data 10:46 AM Page icons represent data
8 Connectors 10:18 AM Connectors Solid arrows represent precedence: Dashed arrows represent messages/data: Dashed arrows with open arrowheads indicate inputs to a process. Process Page 8
9 Process Page 9 Events 10:16 AM Circles represent events Start event: begins a process. End event: stops a process. Intermediate event
10 Decisions 10:21 AM Decisions are notated by diamonds: Watch out: Both sides of a fork have to have a symmetry If one side sends a message, the other one must as well. Or the recipient will deadlock. Process Page 10
11 Process Page 11 Sub-processes 10:22 AM Sub-processes Can be described via nested boxes.
12 Basic example of BPMN: course registration 10:26 AM Too simple, because There are two entities. They exchange information. Exchange isn't modeled. Process Page 12
13 Process Page 13 But 10:29 AM Processes are never this simple! Multiple participants ("pools"). Timing requirements ("events"). Loops ("negotiations"). Exceptions and errors.
14 Pools 10:49 AM Pools represent participants (entities) involved in an event. Process Page 14
15 Process Page 15 Doctor's appointment example 11:50 AM Source:
16 Process Page 16 Loops 10:59 AM Loops represent repeated tasks or negotiations Try for appointment until you succeed!
17 Process Page 17 Some helpful notations: 10:31 AM Some helpful notations:
18 Process Page 18 Low- and high-level depictions 11:54 AM Low and high-level depictions: High level: Low level: Source:
19 Process Page 19 Why BPMN is important 11:13 AM Why BPMN is important: Makes business processes explicit. Defines roles. Depicts interactions between roles. Exhibits the true complexity of processes. Documents failure modes. Can be used to analyze and tune processes.
20 Process Page 20 The big issue Wednesday, March 30, :05 PM The BPMN diagram tells us exactly what impact IT has upon the business. If we model ourselves as a process, e.g., what is done in the cloud, then we also model what happens when we fail.
21 Process Page 21 Process versus orchestration 11:19 AM Process versus orchestration BPMN: defines business processes Orchestration: assigns (internal) processes to responsible parties. Orchestration language: WS-BPEL (Web Services Business Process Execution Language)
22 Process Page 22 The dream of BPEL 11:30 AM The dream of WS-BPEL You define services via, e.g., AXIS (or by hand (gasp!)). This generates a WSDL file for each service, which contains Xschemas for input and output. BPEL "orchestration" defines how services interact, and which services are "bound" to each activity, by referencing (AXIS-generated) WSDL files for each service. A BPEL "engine" (e.g., IBM Websphere, Apache ODE) executes the orchestration file and creates a website that supports your business process. With the proper BPEL, a web "solution" pops into existence, with pages for all people, and interactions with each!
23 Process Page 23 WS-BPEL 11:58 AM WS-BPEL An "XML Programming Language" An open standard Derived from IBM and other process standards. Executed by several engines. Reference: l/wsbpel_tut.php (I am fairly sure the example is incorrect!) Reference:
24 Process Page 24 Contents of a BPEL description 12:00 PM Contents of a BPEL description Process descriptions within a pool in BPMN. Bindings for particular services. Note that unlike BPMN, BPEL has non-graphical components, including the service bindings themselves. A BPEL process describes one pool of a BPMN diagram.
25 Process Page 25 Parts of BPEL 12:01 PM Parts of BPEL XSD (XML Schema Definitions) define types to be used. (internally, uses XSL and XSLT!) XPATH specifies data queries and boolean operators when choices are made. WSDL (Web Service Definition Language) defines services you may have created (using, e.g., AXIS). BPEL (Business Process Execution Language) glues together WSDL's to create a business process.
26 Process Page 26 Breaking things down into a "service" 6:38 PM Breaking things down: A message to a customer is a service call. Data to a principal (e.g., a lawyer) is a service call.
27 Process Page 27 A BPEL definition 2:23 PM A BPEL process <process name='foo'> <!-- BPEL "activities" --> </process> An activity can be Receiving a message. Sending a message. Querying a service. A sequence of activities. A set of parallel activities. For, while, do until loops. If-else constructions. Pick: switch on first message received. Aside: BPEL is not based upon lambda-calculus, but upon an alterative pi-calculus. BPEL is an orchestration language: It says what components should do in order to interact.
28 Process Page 28 Scope 2:32 PM Scope By default, all variables are global to a process One can use <scope>...</scope> declarations to keep variables, exception handling, etc local to a region.
29 Variables 12:57 PM Variables <variables> <variable name="myvar1" messagetype="myns:mywsdlmessagedatatype" /> <variable name="myvar1" element="myns:myxmlelement" /> <variable name="myvar2" type="xsd:string" /> <variable name="myvar2" type="myns:mycomplextype" /> </variables> Pasted from < Kinds of variables: messagetype: appropriate for a SOAP message, declared in WSDL. type: appropriate for local processing, declared in XSD. element: a piece of XML. Process Page 29
30 Process Page 30 Receiving requests from others 12:59 PM <receive name="receiverequestfrompartner" createinstance="yes" partnerlink="clientstartupplt" operation="startprocess"... /> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm> Taking this apart createinstance: create a new process when this happens. partnerlink: which partner sends you the message. operation: what to do when you get it.
31 Process Page 31 Replying to requests 1:02 PM <reply name="replyresponsetopartner" partnerlink="clientstartupplt" operation="startprocess"... /> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm> Taking this apart: partnerlink: who to send it to. operation: what to do when it's done. Event, condition, action Event: something that happens Condition: some way to select a subset of events. Action: something that happens, if the event has the condition.
32 Process Page 32 Invoking other services 1:00 PM Two forms of valid requests: a. Request/response: <invoke name="requestresponseinvoke" partnerlink="businesspartnerservicelink" operation="requestresponseoperation" inputvariable="input" outputvariable="output" /> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm> Taking this apart partnerlink: who to contact. operation: what to do on the other side. inputvariable: what to send. outputvariable: where to put what you get back. This is an RPC call: request/response. Appropriate use: Query by key a. One-way: <invoke name="onewayinvoke" partnerlink="businesspartnerservicelink" operation="onewayoperation" inputvariable="input" /> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm> Taking this apart:
33 Process Page 33 partnerlink: who to contact. operation: what to do on the other side. outputvariable: what to send. Appropriate use: Storing data.
34 Process Page 34 Sequencing 1:03 PM Sequencing means doing things in order. <sequence name="invertmessageorder"> <receive name="receiveorder"... /> <invoke name="checkpayment"... /> <invoke name="shippingservice"... /> <reply name="sendconfirmation"... /> </sequence> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm>
35 Process Page 35 Conditionals 1:07 PM Conditionals <if name="isorderbiggerthan5000dollars"> <condition> $order > 5000 </condition> <invoke name="calculatetenpercentdiscount"... /> <elseif> <condition> $order > 2500 </condition> <invoke name="calculatefivepercentdiscount"... /> </elseif> <else> <reply name="sendnodiscountinformation"... /> </else> </if> Pasted from <
36 Process Page 36 Iteration 1:08 PM Iteration <while> <condition> $iterations < 3 </condition> <invoke name="increaseiterationcounter"... /> </while> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm> and <repeatuntil> <invoke name="increaseiterationcounter"... /> <condition> $iterations > 3 </condition> </repeatuntil> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm> True use of iteration: evaluating multiple alternative services. This is not a calculation language. It is a glue language. Best use of iteration: try a set of services until one answers.
37 Process Page 37
38 foreach 1:10 PM foreach <foreach parallel="no" countername="n"...> <startcountervalue>1</startcountervalue> <finalcountervalue>5</finalcountervalue> <scope> <documentation>check availability of each item ordered</documentation> <invoke name="checkavailability"... /> </scope> </foreach> Pasted from < Process Page 38
39 Parallel execution 1:11 PM Parallel execution <flow...> <links>... </links> <documentation> check availability of a flight, hotel and rental car concurrently </documentation> <invoke name="checkflight"... /> <invoke name="checkhotel"... /> <invoke name="checkrentalcar"... /> </flow> Pasted from < primer.htm> Process Page 39
40 Process Page 40 Links 2:34 PM Links During a parallel computation, you may want certain phases to wait for others. A "link" is a boolean variable that becomes true under specified conditions. This controls whether a parallel process can continue or not.
41 Links and parallel execution 1:12 PM <flow...> <links> <link name="request-to-approve" /> <link name="request-to-decline" /> </links> <receive name="receivecreditrequest" createinstance="yes" partnerlink="creditrequestplt" operation="creditrequest" variable="creditvariable"> <sources> <source linkname="request-to-approve"> <transitioncondition> $creditvariable/value < 5000 </transitioncondition> </source> <source linkname="request-to-decline"> <transitioncondition> $creditvariable/value >= 5000 </transitioncondition> </source> </sources> </receive> <invoke name="approvecredit"...> <targets> <target linkname="request-to-approve" /> </targets> </invoke> <invoke name="declinecredit"...> <targets> <target linkname="request-to-decline" /> </targets> </invoke> </flow> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm> Process Page 41
42 Taking this apart request-to-approve: a flag that is true if the request should be approved. approvecredit: a service call that will be invoked if request-toapprove is true. A link is a variable that is set entirely for its side-effects. The side-effect of a link being true is invocation of a specific service. Process Page 42
43 Process Page 43 Join conditions 1:15 PM Join conditions: operation is invoked if one target is present: <flow...> <links> <link name="request-to-approve" /> <link name="request-to-decline" /> <link name="approve-to-notify" /> <link name="decline-to-notify" /> </links> <receive name="receivecreditrequest" createinstance="yes" partnerlink="creditrequestplt" operation="creditrequest" variable="creditvariable"> <sources> <source linkname="request-to-approve"> <transitioncondition> $creditvariable/value < 5000 </transitioncondition> </source> <source linkname="request-to-decline"> <transitioncondition> $creditvariable/value >= 5000 </transitioncondition> </source> </sources> </receive> <invoke name="approvecredit"...> <source linkname="approve-to-notify" /> <targets> <target linkname="request-to-approve" /> </targets> </invoke> <invoke name="declinecredit"...> <source linkname="approve-to-notify" />
44 Process Page 44 </ <invoke name="declinecredit"...> <source linkname="approve-to-notify" /> <targets> <target linkname="request-to-decline" /> </targets> </invoke> <reply name="notifyapplicant"...> <targets> <joincondition> $approve-to-notify or $decline-to-notify </joincondition> <target linkname="approve-to-notify" /> <target linkname="decline-to-notify" /> </targets> </invoke> </reply> </flow> Pasted from < Taking this apart Either decline-to-notify or approve-to-notify gets set. When either one is set, notifyapplicant gets called. There is no sequence to whether decline-to-notify or approve-tonotify gets set first. The whole interaction is asynchronous: The event notifyapplicant gets called when the arrival event is approve-to-notify or decline-to-notify.
45 Process Page 45 Fault Handling 1:16 PM Fault Handling <faulthandlers> <catch faultname="bookoutofstockexception" faultvariable="bookoutofstockvariable">... </catch> <catchall>...</catchall> </faulthandlers> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm>
46 Scopes 1:18 PM Scopes Can use scopes to create local: Variables Fault handlers <scope> <faulthandlers> <catch faultname="xyz:anexpectederror">...</catch> <catchall><!-- deal with other errors -->... </catchall> </faulthandlers> <sequence> <!-- or flow --> <!-- do work --> </sequence> </scope> Pasted from < Process Page 46
47 Process Page 47 Waiting for events 1:20 PM Waiting for mutually exclusive events <pick> <onmessage partnerlink="buyer" operation="inputlineitem" variable="lineitem"> <!-- activity to add line item to order --> </onmessage> <onmessage partnerlink="buyer" operation="ordercomplete" variable="completiondetail"> <!-- activity to perform order completion --> </onmessage> <onalarm> <for>'p3dt10h'</for> <!-- handle timeout for order completion --> </onalarm> </pick> Pasted from < open.org/committees/download.php/23964/wsbpel-v2.0- primer.htm> Taking this apart: onmessage: first one that is received is processed. onalarm: handles timeout events: 3 days 10 hours.
48 Process Page 48 Critique 2:41 PM Critique Much slower execution time than Java glue... But glue program is shorter! Very general: Responses can be whole web pages (servlet invocations). Requests can be AJAX. But: there is a very serious limit BPEL isn't "reusable". The concept of a subroutine does not exist.
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