95-843 Service Oriented Architecture               Homework 1

Assigned: Tuesday, March 18, 2014   Due: Tuesday, April 1, 2014
                                    Adelaide Due: Fri. April 4, 2014 


Fundamental Issues
==================

Read the chapter on Petri nets from the Johnsonbaugh
text (PetriNetIntro.pdf)  and read the article by Hamadi on web 
service composition using Petri nets. Read the BPMN slides from
IBM. Watch the four short videos on BPMN. All of these are 
provided on the course schedule.

Blackboard submission: Submit a Word document or a PDF scan of
your work to blackboard.

Model the following algorithms with Petri nets. Provide a 
single marking that represents the situation prior to execution of
the algorithm. That is, each Petri net must begin with a single 
marking. In all of your Petri nets, be sure to exploit parallelism 
wherever possible.


1. A = 1                 5 Points
   B = 2
   C = A + B
   C = C + 1
   Print A,B,C
   
2. A = 2                 5 Points
   B = A + A
   C = 3
   D = A + A
   C = A + B + C
   Print C
   
3.     A = 1              5 Points
       S = 0
   10  S = S + A
       A = A + 1
       Print A
       GOTO 10

4. Wash a lion:           5 Points

   1. Get lion.
   2. Get soap. (real soap not SOAP)
   3. Get tub.
   4. Put water in tub.
   5. Put lion in tub.
   6. Wash lion with soap.
   7. Rinse lion.
   8. Remove lion from tub.
   9. Dry lion.

5. In class we described a set theoretic description 
of Petri nets. Represent the Petri net you drew
in question 4 (Washing the lion) using sets. Show
the sets P, T and E as on slide 25 of the Introductory
slides. 5 Points

6. Describe the following web service in words: 
   Ref(S1, assess_claim, [A1:An]). 5 Points

7. Prove statement (20) of the Service Algebra studied in class. 2.5 Points

8. Prove statement (21) of the Service Algebra studied in class. 2.5 Points

9. Wash the lion again. This time use the Business Process Modeling
Notation as described on the slides from IBM. Be sure to exploit
parallel execution where possible. 10 Points

10. a. Consider the Expense Reimbursement Process on slide 76 of IBM's    5 Points
       BPMN slides. Briefly describe where the diagram uses parallelism.
    b. In the video BPMN Tutorial - Part 2 - Collaborations, two pools are
       used. What is each pool used to represent.
    c. In the video BPMN Tutorial - Part 2 - Collaborations, several different
       types of BPMN "events" are used. List each event type.
    d. Describe the use of BPMN gateways in the video BPMN Tutorial - Part 2 - 
       Collaborations.

 In chapter 2 of "Oracle SOA Suite 11g R1 Developer's Guide" we are
presented with two short tutorials. 

    (11) The first tutorial introduces us to the construction of a simple 
BPEL process with a mediator component. Work through this tutorial and 
submit screen shots of the test environment. The screen shots should 
include your name as the input and output of the process. 
Also, include a screen shot showing your BPEL process diagram. (10 Points)

    (12) The second tutorial introduces the Oracle Service Bus and steps us
through the process of building a proxy service and a business service.
Work through this tutorial and submit screen shots of the test environment. 
The screen shots should include your name as the input and output 
of the process. (10 Points)

    Short answer essay questions. Answer the following questions with a few 
well written sentences devoted to each. Prior to answering these questions, 
be sure to read over the EIP site (linked to from the course schedule) and 
the Oracle OSB presentation (also linked to from the course schedule.) Your 
answers should be submitted to Blackboard. Neatness counts. Anything that
is confusing or hard to read loses points.

    (13) Why is it said that an ESB provides for location transparency? (3 Points)

    (14) How might an ESB allow us to avoid format dependencies? (3 Points)

    (15) Consider the Message Translator pattern found on the Enterprise
Integration Patterns (EIP) site. Discuss this pattern with respect to 
Oracle's Service Bus. (3 Points)

    (16) From EIP, draw the Command Message pattern and the Document message
pattern. (3 Points)

    (17) Draw the EIP Process Manager pattern and discuss with respect
to the tutorial in Chapter 2. Be sure to take a stand. Is EIP Process Manager
describing BPEL or the ESB? (3 Points)

    (18) How might an ESB be used to promote protocol independence? Be sure to
describe what is meant by "protocol independence". (3 Points)

    (19) In the slides on Oracle OSB there is a discussion of advanced
mediation policies. What is meant by the term "throttling"? (3 Points)

    (20) On page 15 of "Oracle SOA Suite 11g R1 Developer's Guide", there
is a discussion concerning "Interoperability". What does the author mean
when he says that text based standards allow us to avoid issues around 
conversion between binary forms? (3 Points)

    (21) What role does BIAN (Banking Industry Architecture Network) play
in the SOA space? Be sure to describe BIAN's members and the focus of
this effort.  (3 Points)

    (22) What role does the Kuali foundation play in the SOA space? Be sure
to describe the Kuali Foundation's members and the focus of this effort.
(3 Points)