Blue Ruby SDN Webinar

Blue Ruby A Ruby VM for the ABAP Web Application Server Anne Hardy Juergen Schmerder Murray Spork Daniel Vocke SDN Mentors Webinar, 04-07-2009

Agenda 1. Blue Ruby – Who, What and Why 2. Use Cases for Blue Ruby 3. Technical Overview of Blue Ruby 4. Demo 5. Status and Next Steps 6. Discussion / Q&A © SAP 2008 / Page 2

Blue Ruby – Who? SAP Research Americas and China Platform Research Anne Hardy Blue Ruby Juergen Schmerder Murray Spork (project lead) Daniel Vocke Joseph Wang Florian Reinhart Su Yu (student) Kevin Schlieper (student)

Blue Ruby – What? Combine the best of both worlds ABAP Application Server Ruby Known for robustness and work process Pure object-oriented dynamic general- isolation purpose language Highly scalable Perfectly suited for rapid prototyping Sophisticated software logistics and Rich and thriving community, especially software lifecycle management among web developers Unrivaled breadth and depth of existing Supports implementation of internal DSLs Enterprise Applications Evolutionary, non-disruptive extension of the ABAP VM Runs inside the ABAP VM, does not require additional server Sandbox approach allows consumer-specific adaptation inside the platform, without breaking platform consistency Experimental! Enterprise-ready Dynamic Language Environment Making the simple things simple and the complex things possible © SAP 2008 / Page 4

Blue Ruby – Why? Why a dynamic language? Why inside the ABAP VM? Agile development Locality Rapid prototyping Having code where the data is Fast iterations Local in-process communication Constant refactoring Unload I/O Ideal for glue code and DSLs Landscape simplification Duck-typing makes it easy to No separate server necessary adapt to underlying application Central IT administration Eval(), closures, … Leverage It’s a trend in the industry… ABAP authorizations Microsoft ABAP transports Sun … © SAP 2008 / Page 5

Programming Models Evolve Faster Than Platforms Timeless Software (Vishal Sikka)[1] Best of both worlds: the flexibility of “glue code” alongside the “enterprise” qualities of the ABAP stack “The glue that binds” There is no “one-size-fits-all” approach Choose the right tool (language) for the job at hand …scripting and dynamic languages are good for some things …but coding core business logic in ABAP is not going away Multi-language stacks Flexibility in language choice whilst maintaining coherence Industry trend: .NET now followed by Java [1] Timeless Software: Part 2, Vishal Sikka https://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/11837

A New Programming Model for Light-Weight Application Extension Scenarios Light-weight extensions: e.g. situational and departmental applications Speed of development and flexibility are valued more than: performance of runtime lifecycle management “Whether Ruby on Rails becomes prevalent governance inside the enterprise or not - in the future building Web applications inside the enterprise will look a lot like it (RoR)” Is it possible to “teach” the ABAP -- paraphrasing Tim Bray stack some of the tricks from Ruby on Rails? For e.g.: Convention over configuration Simple things are simple - complex things are possible Opinionated development Do Not Repeat Yourself (DRY) Test (or Behavior) Driven Development (TDD/ BDD) Extendible Domain Specific Languages

Lazy developers want an embedded scripting environment Runtime benefits: Locality: extension logic runs in the backend where the data and business logic live Make use of existing extension points for call-backs (i.e. ABAP calling script code - e.g. BADIs) Developer experience: Simplify landscape: avoid maintaining separate infrastructure/ app servers (e.g. Rails instances) Don’t want to deal with low level issues such as connectivity, remoting protocols No need to worry about security, scalability, deployment etc. Just get a developer account: log in, write code, test/execute

Why Ruby? Could have chosen any scripting language - but: Ruby is fun Ruby is cool Support for DSLs Implementation reasons (principle of least surprise) Enterprise Ruby developers are on the increase In future could abstract this into a “Dynamic Language Runtime” (ala the CLR in .NET) that could support any dynamic language

Potential Use Cases Scenarios we have already experimented with: Composing and adapting RFCs, BAPIs, Enterprise Services Today’s demo Exposing such composition via HTTP as RESTful services Exposing POWL (worklist data) as an RSS/ATOM feed Scripting Extentions to UI (e.g. floor plan manager) Custom BAdI extensions Batch-job scripting (e.g. Twitter alerts) Other scenarios we will be exploring: Bi-directional synching of business data via ATOM Pub Test scripts for Business Objects/ Enterprise Services Exploratory throw away prototyping Have we missed any important use cases?

Vision: A Different Type of Developer (to what SAP usually caters for) Can Blue Ruby open up the ABAP stack to non-ABAP Developers? In this context it is important to understand how the sandboxing concept allows us to restrict what a Blue Ruby developer can do (but we will come back to that) A new persona Line-of-business developers Casual (non-professional) developers Close to “the business” - have significant domain expertise Programming may not be their full-time job - but they are comfortable doing simple scripting (macros in Excel, Visual Basic in Office apps)

Platform-as-a-Service on the inside INSIDE THE ENTERPRISE OUTSIDE THE ENTERPRISE PROVIDERS IT SERVICE IT Dept. Both IT Dept. and Coghead are service providers to LOB PLATFORM Internal Order ... Mgmt. PaaS SAP Business Suite Internal PaaS allows LOB to create their External PaaS allows LOB to own services and data-feeds from the create highly collaborative web-apps backend Customers/ Line-of-Business Partners © SAP 2007, , CSG/13

Blue Ruby Architecture © SAP 2008 / Page 15

From Ruby to ABAP © SAP 2008 / Page 16

Blue Ruby Virtual Machine © SAP 2008 / Page 17

Blue Ruby Building Blocks Blue Ruby Compiler Towards a self-hosting Ruby environment Blue Ruby Runtime Extends the ABAP VM to support Ruby Blue Sec Policy-driven security ensures platform integrity Blue Bug A Ruby developer needs a Ruby debugger Blue Ruby IDE SAPGui or DHTML (or your own) BRIL Secure Bridges Blue Ruby Intermediate Sandboxed access to ABAP Applications Language – a representation of Blue FS a dynamic program the ABAP VM understands A database-backed virtual file system with RESTful and WebDAV access © SAP 2008 / Page 18

Implementation Status – the good news Completeness Performance Language 82 11% 647 Success 89% Fail Core lib 1381 32% Success 2873 Fail 68% © SAP 2008 / Page 21

Implementation Status – the bad news Completeness Performance Fibonacci (20) Stdlib Time (ms) 1870 0% 2000 1500 Success 1000 Not tested 100% 500 15 10 0 MRI ABAP Blue Ruby Count to 100000 Rails? not yet 3000 Time (ms) C-libs? No! 3000 2500 2000 <your favorite> not yet 1500 (probably) 1000 16 11 500 0 MRI ABAP Blue Ruby © SAP 2008 / Page 22

Existing Blue Ruby demo applications Rails Application Atom/RSS Reader Coghead Application Blackberry Twitter © SAP 2008 / Page 23

Next steps – SDN Collaboration Trial system available outside SAP firewall Terms: NDA / trial agreement required for non D/I/C-Users If interested – talk to us: anne.hardy@sap.com, juergen.schmerder@sap.com Series of Weblogs planned on SDN Code examples on how to use Blue Ruby From simple snippets to full-blown application Feedback highly appreciated Would a scripting environment for ABAP be useful? How would you use Blue Ruby? What is missing? Deeper involvement (get copy of source code) might be possible If interested – talk to us: anne.hardy@sap.com, juergen.schmerder@sap.com © SAP 2008 / Page 24

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Blue Ruby SDN Webinar

by Juergen Schmerder

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