April 2016
Intermediate to advanced
256 pages
4h 57m
English
Content preview from Apex Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The singleton pattern
The singleton design pattern restricts the instantiation of a class to only one object.
This is a useful design pattern in Apex and is frequently used. As discussed in the previous chapter, Salesforce has various governor limits; for example, a number of SOQL queries, a number of query rows returned, and a number of DML operations that can be performed in a single request.
Using the singleton design pattern, we can make sure that utility classes are instantiated only once, which can help in avoiding governor limits.
The sales division of a call center receives calls either from a customer or broker who is interested in the product. If a call comes directly from a customer, then the call center agents need to create a new opportunity ...
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