Shorten Your Development Time with An Extensible Design for Apex!(NOT a Uni-tasker!)

Robert Nunemaker, Citrix Systems Inc., Senior Systems Architect

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Robert J NunemakerSenior Systems Architect

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?

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.

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.

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

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!

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!

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!