Workshop on Service Identification Techniques

Service Identification Techniques Track: SOA Modeling & BPM Art Ligthart Jan-Willem Hubbers Linda Terlouw

Art Ligthart ( [email_address] ) 1988 – 1994: MSc in Business Administration 1994 – 2008: Solution Architect/Partner Jan-Willem Hubbers ( [email_address] ) 1988 – 1993: MSc in Computer Science 1994 – 1998: PhD in Computer Science 1998 – 2008: Solution Architect Linda Terlouw ( [email_address] ) 1998 – 2003: MSc in Computer Science/ Business Information Technology 2003 – 2005: Consultant 2005 – 2008: Solution Architect 2005 – 2008: PhD Researcher About the workshop organizers

Goal and agenda Agenda: 13:00 – 13:10: Introduction to Service Identification 13:10 – 13:35: Do-it-Yourselves Case Study 13:35 – 13:44: Feedback on Case Study 13:44 – 13:45: “Service Identifier of the Year” Prize Announcement The goal of this workshop is to gain practical experience with service identification techniques.

Method 5: starting from current systems Main idea: existing legacy applications as starting point Pros: pragmatic and quick can be used in a context where little process or function models are available Cons: Law of Conservation of Challenges possible duplicate services due to duplications in application landscape App A App B App C Get Client Data Process Order Arrange Payment Get Client Address Get Client Bank Account Put Client on Blacklist

Method 5: starting from current systems Step 1. Analyse: User interfaces Data model Menus System manual: functions Transactions Application interfaces Batches Output: Reports, … Step 2. List functionalities Step 3. Cluster functionalities Step 4. Determine candidate services Step 5. Feasibility study Step 6. Document services

Method 1: process decomposition Main idea: The business process is subdivided into sub-processes or decomposed into granular activities and tasks. The lowest level tasks can consist of small, cohesive "logical units of work" that are supported by the functionality offered by distinct services. Pros: resulting services have a guaranteed fit with an organization's functional needs very intuitive (use it for proof-of-concepts and pilot projects) Cons: may result in a (too large) gap between services and existing application landscape services can be tailored too specifically to the tasks and activities of one business process (resulting in services that may not be reusable) App A App B App C ? ? ?

Method 1: process decomposition Step 1. Analyse process design Phases (sub)Processes Activities Tasks Step 2. Detail (if necessary) Ensure that each Task is a Logical Unit of Work Step 3. Determine candidate services Each Task is a candidate service Step 4. Feasibility study Remove duplicates Step 5. Document services

And now you have to do some work! The CEO of the insurance company Protector is fed up with the “never ending discussions of architects” and decided to organize a pressure cooking workshop. During this workshop you are expected to identify services. Though time is limited, it would severely disappoint the CEO of Protector if you would return without results!

Do-it-Yourselves Case Study (1/4) Please read the assignment carefully You have 2 minutes for reading it!! 2:00 1:59 1:58 1:57 1:56 1:55 1:54 1:53 1:52 1:51 1:50 1:49 1:48 1:47 1:46 1:45 1:44 1:43 1:42 1:41 1:40 1:39 1:38 1:37 1:36 1:35 1:34 1:33 1:32 1:31 1:30 1:29 1:28 1:27 1:26 1:25 1:24 1:23 1:22 1:21 1:20 1:19 1:18 1:17 1:16 1:15 1:14 1:13 1:12 1:11 1:10 1:09 1:08 1:07 1:06 1:05 1:04 1:03 1:02 1:01 1:00 0:59 0:58 0:57 0:56 0:55 0:54 0:53 0:52 0:51 0:50 0:49 0:48 0:47 0:46 0:45 0:44 0:43 0:42 0:41 0:40 0:39 0:38 0:37 0:36 0:35 0:34 0:33 0:32 0:31 0:30 0:29 0:28 0:27 0:26 0:25 0:24 0:23 0:22 0:21 0:20 0:19 0:18 0:17 0:16 0:15 0:14 0:13 0:12 0:11 0:10 0:09 0:08 0:07 0:06 0:05 0:04 0:03 0:02 0:01 End

Do-it-Yourselves Case Study (2/4) Please make assignment A: Identifying Services from Existing Systems You have 8 minutes!! Do-it-Yourselves Case Study (1/4) Do-it-Yourselves Case Study (1/4) 8 minutes have passed!

Do-it-Yourselves Case Study (3/4) Please make assignment B: Identifying Services from Business Processes You have 13 minutes!! Do-it-Yourselves Case Study (1/4) Do-it-Yourselves Case Study (1/4) 13 minutes have passed!

Do-it-Yourselves Case Study (4/4) Which other methods for service identification would you consider? You have 2 minutes for giving your opinion!! Do-it-Yourselves Case Study (1/4) Do-it-Yourselves Case Study (1/4) 2:00 1:59 1:58 1:57 1:56 1:55 1:54 1:53 1:52 1:51 1:50 1:49 1:48 1:47 1:46 1:45 1:44 1:43 1:42 1:41 1:40 1:39 1:38 1:37 1:36 1:35 1:34 1:33 1:32 1:31 1:30 1:29 1:28 1:27 1:26 1:25 1:24 1:23 1:22 1:21 1:20 1:19 1:18 1:17 1:16 1:15 1:14 1:13 1:12 1:11 1:10 1:09 1:08 1:07 1:06 1:05 1:04 1:03 1:02 1:01 1:00 0:59 0:58 0:57 0:56 0:55 0:54 0:53 0:52 0:51 0:50 0:49 0:48 0:47 0:46 0:45 0:44 0:43 0:42 0:41 0:40 0:39 0:38 0:37 0:36 0:35 0:34 0:33 0:32 0:31 0:30 0:29 0:28 0:27 0:26 0:25 0:24 0:23 0:22 0:21 0:20 0:19 0:18 0:17 0:16 0:15 0:14 0:13 0:12 0:11 0:10 0:09 0:08 0:07 0:06 0:05 0:04 0:03 0:02 0:01 End

“ Service Identifier of the Year” Prize Announcement

Services?!? A service is a task offered by a service provider to (potential) service consumers that conforms to the following properties: accessible through an interface; described by a service specification; implementation is hidden to service consumers; autonomous; stateless. Service identification is about finding the right services! Possible pitfalls: Services in Name Only And Never Shall They Meet Services Perfect Non-Existent Services Babel Services Spaghetti Services

Workshop on Service Identification Techniques

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