Throwing hundreds (or thousands) of lines in a trigger or class will quickly get out of hand. How do you reverse engineer it? How do you see what the trigger is doing? How do you scale and make enhancements without impacting existing code? Join us to learn about a customized coding pattern: EDA - Event, Distpatch, Action. EDA will address all of this and make your code scalable, as well as efficient and very maintainable.

1. Shorten Your Development Time
with An Extensible Design for Apex!
(NOT a Uni-tasker!)
Robert Nunemaker, Citrix Systems Inc., Senior Systems Architect

2. Safe harbor
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forward-looking statements.

3. Robert J Nunemaker
Senior Systems Architect

4. Ask Yourself
• How many of you have triggers and/or classes that have hundreds of
lines?
• How many have had to spend hours reverse engineering code just to find
where something occurs, its dependencies, and how to change it?
• How many don’t code, but wish they could know what is going on inside
the multiple triggers?
• Why can’t we get contractors/new hires to code consistently?

5. Objectives
• Provide another flexible tool for your Apex Development
• Provoke thought into standard patterns (or free-style) that don’t take shared resources into
account.
• Provide a pattern that managers, analysts, and developers alike can benefit from.
• Advantages:
o Scales VERY well.
o VERY readable and easy to maintain.
o VERY modular and a single point of DML and Error handling.
o Limits reverse engineering and regression testing.

6. The Design!
• What IS EDA?
o Event, Dispatch, Action
o Learn the parable of the Plumber!
• Error Handling Benefits
o One place of handling; no need to handle again.
o DML for other objects rolled back to requesting object.

7. The Design!
Let’s look an example trigger for a custom object called Account_Segmentation__c using Eclipse.

8. The Design! (Enhancement)
• When an Account Segmentation is Deleted, we need to update all linking Account Segmentation fields to be initialized
to NULL.
• How? EASY!
o Create your Service method first to update Accounts as necessary. Notice how you can concentrate on the task;
not the “hooks”.
o BUT, those updates are to be put into the sObject LIST for update by the Dispatcher (already coded!).
o Don’t forget your errorMAP population.
o Finally add your small code fragment in your Dispatch Action method:
o DONE!

9. The Design!
• Considerations
o Script statements limits are now effectively removed in Winter ’14.
o Modularization of functionality.
o Other patterns can be used in the Service (Action).
o @Future must still be done in Service.
o Test class considerations (bPreventRecursion).
• Non-Developer Benefits
o No need to read code; just look at Dispatcher Action methods.
o After initial development, enhancements much faster.
o Regression testing easier and sometimes not necessary!
• Snippets in Eclipse!

10. Final Thoughts
• Hopefully you’ve seen how this pattern can benefit stability, scale, maintainability, and
development velocity.
o Ask yourself – Where can you benefit?
• It can be used by developers, analysts, and management to aid them in clarity and future
development needs.
• Even if you don’t use it as shown, maybe it will lead you to some ideas of how to make yourself
more scalable or efficient.
• Most important, does it help you provide better velocity in your enhancements to your customers?
• Chatter posting will include the code, including enhancement code, and instructions on how to
create your own Snippets for Eclipse!